JP2012112900A - Apd measurement display device and apd measurement display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an APD (Amplitude Probability Distribution) measurement display device and an APD measurement display method that minutely and effectively analyze and evaluate APD measurement results of multiple channels.SOLUTION: The APD measurement display device includes: an APD measurement part 100 analyzing frequency components of a signal to be measured, detecting the amplitude of each of the analyzed frequency components and determining an amplitude probability per unit time as for the amplitude of each detected frequency component for each passage of time; a storage part 200 storing the amplitude probability of the amplitude of each of the frequency components outputted by the APD measurement part 100 corresponding to the passage of time; and a display control part 300 allowing a display 400 to display a plurality of graphs in which parameters of frequency, amplitude, amplitude probability and time are combined with each other on the same screen when allowing the display 400 to display a graph whose dimensions of coordinates are two or three out of frequency, amplitude, amplitude probability and time, and which has one other than the two or three as a parameter, based on the latest memory content in the storage part 200.

Description

  The present invention analyzes the frequency component of a signal, and the probability that the magnitude of each frequency component exceeds a predetermined threshold value during a predetermined time (referred to as amplitude probability distribution or simply a time rate, hereinafter referred to as “APD”). ) And displays the result, and an APD measurement display method.

  An APD measurement technique has been conventionally used. For example, there is a technique of Patent Document 1 that measures APD with high amplitude resolution and time resolution. As an example of applying various techniques to a spectrum analyzer or the like, various displays have been proposed. There is technology.

  On the other hand, recently, there is a demand for the simultaneous measurement of APDs having a predetermined plurality of frequency components in parallel by a communication method. For example, as described in Non-Patent Document 1, a standard for digital terrestrial broadcasting is defined as an ARIB standard by the Radio Industries Association (ARIB), and a modulation method based on OFDM (Orthogonal Frequency Division Multiplex Operation Mode) is defined. In this OFDM system, transmission data is divided into thousands of low-speed data in a predetermined band, and digital modulation is performed. For example, the predetermined band is about 5.6 MHz, and the transmission data is divided into carrier units of about 1 kHz, and is digitally modulated into a total of 5,600 lines.

  Therefore, it is desired that the APD measurement in the OFDM system is performed by analyzing the frequency of the signal component about every 1 kHz and measuring the APD of each frequency component in parallel. Moreover, it can measure in parallel with the APD described in Patent Documents 1 and 2.

  Regarding the display of the APD, in Patent Document 2, the probability distribution is displayed in a band for each probability range, so that the distribution is identified and displayed so as to be easily visible.

Japanese Patent No. 3156152 Japanese Patent No. 3374154

Toshiba Review VOL. 58 No. 12 (2003), p. 2-6

  By the way, in a measurement under a communication environment having a huge number of channels over a dense frequency band as in the OFDM method described above, amplitude changes in a large number of communication channels are measured at the same time, and the phenomenon is crushed over a wide level range. Multi-channel simultaneous APD measurement to grasp is an effective means.

  In this multi-channel simultaneous APD measurement, in order to effectively analyze the statistical tendency of the measurement signal, APD measurement results of the measurement channels (measurement frequency components) being simultaneously measured are displayed simultaneously as much as possible, and the measurement time is measured. It is desirable to be able to display the APD time variation for the whole.

  Multi-channel simultaneous APD measurement results easily analyze the causal relationship between each attribute of the measurement signal by displaying multiple types of graphs combining the four attributes of frequency / occurrence time / amplitude level / APD of the signal to be measured can do.

  In conventional APD measurement, digitized data is captured, and the captured data is subjected to FFT processing in software. The combination of the time axis, frequency axis, and amplitude axis as the physical axes that represent the measurement signal is usually Since the time axis-amplitude axis and the frequency axis-amplitude axis are independent of each other, both of them cannot be simultaneously expanded and displayed on the display unit. Further, since the APD measurement result is displayed on one display screen of the display unit provided in the apparatus main body, the above-described four attributes of the signal to be measured / frequency of occurrence / amplitude level / APD are combined. Multiple types of graph display could not be monitored on the display screen at the same time. For this reason, it is necessary to sequentially switch the APD measurement results displayed on the display screen as necessary, and there is a problem that it takes time and effort to perform multi-dimensional analysis and evaluation.

  Accordingly, the present invention has been made in view of the above problems, and provides an APD measurement display device and an APD measurement display method capable of analyzing and evaluating a multi-channel APD measurement result in detail and effectively. It is an object.

In order to achieve the above object, an APD measurement / display apparatus according to claim 1 of the present invention analyzes a frequency component of a signal under measurement, detects an amplitude of each analyzed frequency component, and detects each detected frequency component. An APD measuring unit 100 that obtains an amplitude probability per unit time with respect to the amplitude of the frequency component for each passage of time, and a storage unit 200 that stores the amplitude probability of the amplitude of each frequency component output by the APD measuring unit corresponding to the passage of time. And two of the frequency, amplitude, amplitude probability, and time based on the latest storage contents of the storage unit obtained by accessing the storage unit at a predetermined timing. Or an APD measurement display device comprising a display control unit 300 for displaying on the display unit a graph having three as dimensions and the remaining one as a parameter,
The display control unit displays a plurality of graphs combining the parameters of the frequency, the amplitude, the amplitude probability, and the time on the same screen of the display unit.

The APD measurement display device according to claim 2 is the APD measurement display device according to claim 1,
An external display 700 is connected via an input / output unit 800, and the display unit 400 and the external display are distributed to display the plurality of graphs.

The APD measurement display method according to claim 3 analyzes the frequency component of the signal under measurement, detects the amplitude of each analyzed frequency component, and determines the amplitude per unit time for the detected amplitude of each frequency component. Probability is obtained for each passage of time, the amplitude probability of the amplitude of each frequency component is stored corresponding to the passage of time, and two or three of frequency, amplitude, amplitude probability, and time are stored based on the latest stored contents. An APD measurement display method for displaying a graph having a parameter as a parameter at coordinates having a dimension as one,
The method includes a step of displaying a plurality of graphs combining the parameters of the frequency, the amplitude, the amplitude probability, and the time on the same screen of the display unit 400.

The APD measurement display method according to claim 4 is the APD display method according to claim 3,
The method includes a step of displaying the plurality of graphs in a distributed manner between the external display 700 connected via the input / output unit 800 and the display unit 400.

  According to the present invention, the frequency component of the signal under measurement is analyzed, the amplitude of each analyzed frequency component is detected, and the amplitude probability per unit time for the detected amplitude of each frequency component is obtained for each elapsed time. The amplitude probability of the amplitude of each frequency component is stored in the storage unit corresponding to the passage of time, and the APD measurement time axis and frequency axis simultaneous measurement technology processed in real time by short-time Fourier transform is applied. As a result, accurate frequency and time characteristic information can be acquired at the same time, and it is possible to display time and frequency at the same time instead of simply combining the conventional displays. can do. In addition, a plurality of graphs combining frequency, amplitude, amplitude probability, and time parameters can be displayed on the same screen of the display unit, and the multi-channel APD measurement results can be analyzed and evaluated in detail and effectively. be able to.

  Moreover, according to the configuration in which an external display is used in addition to the display unit, the number of graphs that can be displayed on the display screen is increased, each graph display is compared, and APD measurement results are analyzed and evaluated in a multifaceted manner. Can do.

It is a figure which shows the function structure of embodiment of the APD measurement display apparatus which concerns on this invention. It is a figure for demonstrating the aspect of the graph displayed in this embodiment, and its switching aspect. It is a figure which shows the example of a graph which uses the amplitude (level) range as a parameter on the coordinate where time is fixed to a specific value, and frequency is abscissa and amplitude probability (APD) is ordinate. It is a figure which shows the example of a display of which a time is fixed to a specific value, and an amplitude probability (APD) range is a parameter on the coordinate which uses a frequency as a horizontal axis and a level as a vertical axis. It is a figure which shows the example of a graph which uses an amplitude probability (APD) range as a parameter on the coordinate which an amplitude (level) range is fixed to a specific value, a frequency is a horizontal axis and time is a vertical axis | shaft. It is a figure which shows the example of a graph which uses an amplitude (level) range as a parameter on the coordinate which makes an amplitude probability (APD) range fixed to a specific value, uses a frequency as a horizontal axis and time as a vertical axis. It is a figure which shows the example of a display of the graph of the coordinate which has a level range fixed to a specific value for every frequency (a frequency is a parameter), time is set as a horizontal axis, and an amplitude probability (APD) is set as a vertical axis | shaft. It is a figure which shows the example of a display of the graph of the coordinate which makes an amplitude probability (APD) range fixed to a specific value for every frequency (a frequency is a parameter), sets time as a horizontal axis and makes an amplitude (level) a vertical axis | shaft. It is a figure which shows the example of a display of the graph of the Rayleigh scale which uses a frequency as a parameter on the coordinate which makes an amplitude (level) a vertical axis | shaft and APD is a horizontal axis. It is a figure which shows the example of a display of the logarithmic graph which uses a frequency as a parameter on the coordinate which makes an amplitude (level) a horizontal axis and APD is a vertical axis | shaft. A display example of a graph using a frequency as a parameter on a three-dimensional coordinate with an amplitude (level) range fixed at a specific value, a frequency as a horizontal axis, an amplitude probability (APD) as a vertical axis, and time as an axis in the depth direction is shown. FIG. A display example of a graph using a frequency as a parameter on a three-dimensional coordinate with an amplitude probability (APD) range fixed to a specific value, a frequency as a horizontal axis, an amplitude (level) as a vertical axis, and time as an axis in the depth direction is shown. FIG. It is a figure for demonstrating a peak marker. It is a figure for demonstrating full span, a zone marker, and expansion / contraction. It is a figure which shows the example of a display of the average process method in the case of _Nmeas > _Ndisp . It is a figure which shows the example of a display of the average processing method in the case of _Nmeas <= _Ndisp . It is a figure which shows the example of a display of a thinning-out processing method. It is a figure which shows the other example of a display of a thinning-out processing method. It is a figure which shows the example of a display at the time of performing the several kind of several graph on the same display screen by a multiscreen display function. It is a figure which shows the example of a display at the time of performing several graphs of the same kind on the same display screen by a multiscreen display function. It is a figure which shows an example at the time of displaying a some graph by the multi-screen display function which used the display part of the APD measurement display apparatus, and the external display together.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited by this embodiment, and all other forms, examples, operation techniques, etc. that can be implemented by those skilled in the art based on this form are included in the scope of the present invention. .

  First, a main configuration related to APD measurement of the APD measurement display device according to the present invention will be described with reference to FIG. As shown in FIG. 1, the APD measurement display device 1 includes an APD measurement unit 100, a storage unit 200, a display control unit 300, a display unit (display device) 400, an operation unit 500, and a control unit 600.

  The APD measurement unit 100 measures APD in a desired frequency band from an input signal, and includes a frequency analysis unit 110, a level detection unit 120, and an APD unit 130.

  The frequency analysis unit 110 selects an input signal in a desired frequency band (broadband) to be measured, and further selects the input signal in a narrower desired frequency band (narrow band). / D conversion means 110b and frequency selection means 110c. As the band selection means 110a, for example, if it is intended to measure noise in a high-frequency communication frequency band, a so-called heterodyne system as disclosed in Patent Document 2 can be adopted. That is, the input signal (noise) is mixed by a local oscillator and converted to a low frequency signal, and is limited to a frequency component in a necessary frequency band by using a band pass filter of a desired frequency band (δF).

  In addition, if the frequency band of the signal to be measured is low and the frequency band can be directly used by the A / D conversion unit 110b, the band selection unit 110a is not necessarily required.

  The A / D conversion unit 110b receives the frequency component (signal) of the low frequency band-limited by the band selection unit 110a, and is fine with an amplitude (level) width ΔL with a clock of a period from a clock generator (not shown). (There is a threshold corresponding to this fineness.) Sampling (sampling) and converting to digital data. The amplitude probability (APD) to be obtained later is obtained for each fineness of the level width ΔL at the time of sampling.

  The frequency selection unit 110c receives a low-frequency signal over a frequency band of δF, and further includes n (hereinafter, sometimes referred to as n (numerical value) channels or n (numerical value) CH) band-pass filter groups. The frequency band is divided into fine frequency bands (δF / n). For example, if the channel of the communication line is every 1 kHz, n band-pass filters BPF1 to BPFn having a center frequency shifted by 1 kHz and a frequency band of approximately 1 kHz are provided. The frequency selection means 110c can be performed by performing a software FFT process with a CPU as a filter bank, for example.

  The level detection unit 120 includes detectors DET1 to DETn that detect amplitudes corresponding to the respective outputs of the bandpass filter of the frequency selection unit 110c, that is, amplitudes of the respective channels. The amplitude (level) of the center frequency) is detected.

  The APD unit 130 includes APD1 to APDn which are APD detectors that measure amplitude probabilities corresponding to the detectors DET1 to DETn, a clock generation unit 130a, and a range classification unit 130b. The configurations and operations of the APD1 to APDn are the same, and the amplitude probability is measured by logarithmically converting the outputs of the detectors DET1 to DETn with a LOG converter and converting the unit of amplitude to “dB”. Here, a conventional APD can be adopted as an APD that is an APD detector for measuring the amplitude probability. For example, the APD described in Patent Document 2 or the APD described in Japanese Patent Application No. 2006-253889 can be used.

  APD1 to APDn measure amplitude probability (distribution). The amplitude probability represents the number of times (the number of occurrences) that an input signal of the same magnitude is received within a predetermined time range (period: Δt). In this example, the fineness for distinguishing the magnitude of the input signal is the same as the fineness ΔL of the A / D conversion means 110b. The time range Δt for measuring the probability follows the control from the clock generator 130a.

  The clock generator 130a uses a pulse generator and a timer, for example, as a time range Δt, such as 1 second interval, 10 second interval, or 1 minute interval (both may be pulses of these time periods). Amplitude probabilities are measured by generating timing signals and causing APD1 to APDn to measure the frequency of the magnitudes of the input signals received within those time ranges. A configuration in which the time range Δt can be changed by changing the count time of the timer through the control unit 600 according to an instruction from the operation unit 500 may be adopted.

  The range classifying unit 130b classifies the range into a certain range according to the value of the amplitude probability calculated by each of APD1 to APDn. This is a function provided in order to classify into a range suitable for the survey with a resolution according to the survey purpose, although the survey may be performed with a resolution of 1%, for example. In this embodiment, the amplitude probability is classified into four stages of 0 to 1%, 1% to 10%, 10% to 50%, and 50% to 100% according to an instruction from the operation unit 500. As a method of classification, for example, the value of the amplitude probability obtained by APD1 to APDn is compared with a plurality of threshold values corresponding to the classified range, and a probability classification identification tag in the range to which the comparison result belongs is attached. The classification range may be changed by changing to a desired threshold value through the control unit 600 in accordance with an instruction from the operation unit 500.

  In addition, from APD1 to APDn, updated amplitude probability values are aggregated and output for each time range Δt if it is fast. Further, the range classification means 130b classifies each amplitude detected by the level detection unit 120 into 20 dB intervals if the entire range of the level measurement range is 0 dBm to −100 dBm, for example, as in the amplitude probability. Is attached.

  The storage unit 200 stores the amplitude values output from the APD1 to APDn and the amplitude probability values thereof as measurement result data (APD measurement results) for all the measurement channels (measurement frequencies) over time. The time passage is stored at least for each time range Δt when the amplitude probability is measured. Further, the storage unit 200 corresponds to the probability classification identification tag when the range classification means 130b classifies the corresponding amplitude probability value, the amplitude classification tag corresponds to the corresponding amplitude value, and corresponds to the measured frequency. And remember. Further, the time information obtained from the amplitude value and the amplitude probability value is also received from the clock generator 130a and stored. Note that the above range classification means 130b is not on the input side (APD unit 130 side) of the storage unit 200, but is on the output side (display control unit 300 side), and stored amplitude probability value or amplitude value. It is also possible to determine which class the amplitude probability value or amplitude value belongs to, and output the determined classification identification tag with the classification attached. The storage unit 200 is accessed from the display control unit 300 and can read the latest stored contents.

  The display control unit 300 is a means for controlling display of the display unit 400 such as various setting items and measurement results necessary for APD measurement, and is roughly divided into the following elements (I) to (V). Yes. That is, the display control unit 300 (I) receives the amplitude probability value, the amplitude value, the frequency, and the time information from the storage unit 200 at a predetermined timing, and generates a graph according to the setting content of the operation unit 500. , Full span control unit 310b, (II) a specified marker generation unit 320, a peak search unit 340 and a peak marker generation unit 350, a zone marker generation unit 360 and an enlargement, which are means for setting a marker on the displayed graph / Screen control unit 330 as means for displaying a desired graph or the like in accordance with the instruction on the display unit 400 based on the instruction from the reduction control unit 310a, the numerical control unit 310c, and (III) the operation unit 500, And (IV) a common display format storage unit 370 and coordinate information storage unit 380 for performing each display, and (V) the display unit 4. One display screen of 0 is divided and set to a screen composed of a plurality of display areas (for example, 2 screens, 4 screens, etc.), and the graph generated by the graph generation unit 310 is displayed and displayed on the screen of the specified display area. A multi-screen display control unit 390 that controls display of a plurality of graphs on the same screen of the unit 400 is provided.

  The setting contents of the operation unit 500 include graph types (spectrum display graphs, spectrogram display graphs, chart display graphs, function display graphs, 3D display graphs), display formats (horizontal axis, vertical axis, Color band, color map), presence / absence of function scale display (logarithmic scale, function scale), enlargement / reduction display (default, full span, zoom), display method (band average, fixed point selection, specified APD value point selection, specified level value) Point selection, peak value point selection, instantaneous power average value point selection, instantaneous voltage average value point selection, peak-to-average power ratio point selection), processing method (average processing, decimation processing), related graph display axes (frequency axis, Time axis).

  The display control unit 300 includes a program that represents the functions (I) to (V), a storage unit, and a CPU that executes the program and realizes the functions. Note that the coordinate information stored in the coordinate information storage unit 380 is information necessary for specifying the position of the display screen such as the displayed graph, scale, and each display field, and the display format storage unit 370 stores the coordinate information. The format that is displayed is the layout and graphics of the graphs, markers, scales, display fields, etc. that are displayed, and each main part of the display control unit 300 specifies the display position when trying to display it. Used to display in a format corresponding to the specified position. In the following description of each element, description of the coordinates and format is omitted.

  The graph generation unit 310 stores the frequency, amplitude, amplitude probability, and the stored frequency based on the latest storage content obtained by accessing the storage unit 200 at a predetermined timing, for example, at intervals of the time range Δt described above. A first graph is generated with coordinates having at least any two of the dimensions as time and other one as a parameter. When the operator watches the data, when the specific marker or the specific range in the two dimensions or parameters on the displayed graph is specified as the specific value by the specified marker, the operation unit 500 In response to the switching instruction from, the two dimensions or parameters designated by the designated marker are generated by switching to a graph for the dimensions and parameters of the new combination that has been designated when the two dimensions or parameters are fixed to the specific values.

  When generating a two-dimensional graph, the graph generation unit 310 is specified (or specified) by a specified marker or peak marker, which will be described later, among the dimensions of frequency, amplitude, amplitude probability, and time, or as a default. The specific value in any dimension is set as a fixed value, and the data of the remaining dimension in which the specific value is involved is read from the storage unit 200. Then, the horizontal axis (hereinafter referred to as “X-axis”) and the vertical axis (hereinafter referred to as “Y-axis”) of the desired graph requested from the operation unit 500 for data of two dimensions among the remaining dimensions. A graph is generated using the remaining one-dimensional data as a parameter, and a graph generation process is performed so that the graph can be updated and displayed at each predetermined timing. In the case of generating a three-dimensional graph, the remaining dimensions other than the dimension for which the specific value is designated are allocated and generated as three dimensions. In addition, when the graph generation unit 310 displays the above-described two-dimensional or three-dimensional graph on the screen of the designated display area on the same display screen of the display unit 400, the graph type is selected by the operation unit 500. When the display method, processing method, and related graph display axes are set, data processing (average processing and thinning processing to be described later) is performed in accordance with the number of display points on the screen in the display area designated by the operation unit 500. A graph to be displayed on the screen of the specified display area is generated.

  Specific graph examples generated by the graph generation unit 310 will be described in the following (a) to (e), and graph switching will be described in (f) and (g). Note that the processing for each dimension of frequency, amplitude, amplitude probability, and time is the same as that of the above-described two-dimensional or three-dimensional graph generation, and the description of each graph is omitted.

  FIG. 2 shows a graph for display divided into a plurality of groups and switching between the graphs. As shown in FIG. 2, the graph group is divided into a spectrum display graph, a spectrogram display graph, a chart display graph, a function display graph, and a 3D display graph for APD measurement. In addition, each numerical value appearing in the following description is an example for explanation.

(A) Graph of spectrum display The graph of this group is suitable for observing the change of amplitude or amplitude probability with respect to frequency, and includes the following (a-1) APD spectrum and (a-2) level spectrum.

(A-1) APD spectrum A graph (table) in which time (t) is fixed to a specific value, the X axis is frequency (f), the Y axis is amplitude probability (APD), and the amplitude range (Lv: level) is a parameter. See FIG. 3 for an example). FIG. 3 shows data when the measurement time is observed at 79 sec (when the measurement time is fixed), and values of the amplitude range as parameters at that time are −20 dBm ≦ amplitude (level) and −40 dBm ≦ amplitude <−20 dBm. -60 dBm≤amplitude <-40 dBm and -80 dBm≤amplitude <-60 dBm. Five markers (MKR) are provided as multi-markers (“▲” in FIG. 3), and all are generated and displayed by the designated marker generation unit 320. In FIG. 3, one of the multi-markers (MKR), that is, MKR5 is displayed as an active marker MKR5, which is a marker that has just been operated from the operation unit 500 at present, and its frequency is just below the left side of the graph. It is displayed. The amplitude (level) and amplitude probability (APD) at each marker are shown in the lower table. The designated marker is set in the range of 10% <APD ≦ 50% of the Y axis.

(A-2) Level spectrum A graph in which time (t) is fixed to a specific value, the X axis is frequency (f), the Y axis is amplitude (Lv), and the amplitude probability range (APD) is a parameter (display example is , See FIG. FIG. 4 shows data when the measurement time is observed at 79 sec as in FIG. 3, and the value of the amplitude probability as a parameter at that time is 50% <APD, 10% <APD ≦ 50%, 1% <APD. ≦ 10%, 0% <APD ≦ 1%, and displayed in different colors. The designated marker is set in the range of −60 dBm ≦ amplitude <−40 dBm on the Y axis.

(B) Graph of spectrogram display The graph of this group is suitable for observing the change of amplitude or amplitude probability with respect to frequency and time, and the following (b-1) APD spectrogram and (b-2) level spectrogram are is there.

(B-1) APD spectrogram A graph in which the amplitude (Lv; level) is fixed to a specific value, the X axis is frequency (f), the Y axis is time, and the amplitude probability range is a parameter (see FIG. 5 for a display example). reference). FIG. 5 shows data when the amplitude range is observed within a range of −60 dBm ≦ amplitude <−40 dBm (when fixed), and the value of the amplitude probability as a parameter at that time is 50% <APD, 10% < APD ≦ 50%, 1% <APD ≦ 10%, 0% <APD ≦ 1% are displayed in different colors. The designated marker is set at time t = 79 sec on the vertical axis.

(B-2) Level spectrogram A graph in which the amplitude probability range (APD) is fixed to a specific value, the X axis is frequency (f), the Y axis is time, and the amplitude range is a parameter (see FIG. 6 for a display example) ). FIG. 6 shows data when the amplitude probability range is observed at 10% <APD ≦ 50% (when fixed), and the value of the amplitude range as a parameter at that time is −20 dBm ≦ amplitude (level), − 40 dBm ≦ amplitude <−20 dBm, −60 dBm ≦ amplitude <−40 dBm, and −80 dBm ≦ amplitude <−60 dBm. Also in this case, the designated marker is set at time t = 79 sec on the vertical axis.

(C) Chart display graphs This group of graphs is suitable for observing the time course of amplitude or amplitude probability for each frequency. The following (c-1) APD chart and (c-2) level chart There is.

(C-1) APD chart Amplitude range (Lv; level) is fixed to a specific value, time (t) on X-axis and amplitude probability (APD) on Y-axis for each frequency (f) (that is, frequency is a parameter) (See FIG. 7 for a display example). In FIG. 7, the values of the amplitude range are displayed in different colors by −20 dBm ≦ amplitude (level), −40 dBm ≦ amplitude <−20 dBm, −60 dBm ≦ amplitude <−40 dBm, and −80 dBm ≦ amplitude <−60 dBm. The designated marker is set at time t = 79 sec on the vertical axis.

(C-2) Level chart The amplitude probability range (APD) is fixed to a specific value, and the X axis is time (t) and the Y axis is amplitude (Lv) for each frequency (f) (that is, the frequency is a parameter). Graph (see FIG. 8 for display example). FIG. 8 shows the values of the amplitude probability range in 50% <APD, 10% <APD ≦ 50%, 1% <APD ≦ 10%, and 0% <APD ≦ 1%. The designated marker is set at time t = 79 sec on the vertical axis.

(D) Graph of function scale display This graph is suitable for observing the relationship between amplitude and probability directly. In general, linear coordinates or one of them is often displayed on a logarithmic scale, but when measuring the noise amplitude probability, there is a graph represented by a Rayleigh function scale as a way of looking at the phenomenon of noise generation. If the signal to be measured is noise, it is convenient to have a function scale such as a Rayleigh distribution, a normal distribution, an exponential distribution, or a χ2 distribution. Regarding the function scale, there is a technique described in Japanese Patent No. 3374154, which is a technique related to the present applicant.

  Here, explanation is made assuming that a logarithmic scale and a Rayleigh function scale are prepared. That is, a graph in which time is fixed to a specific value, the X axis is amplitude (Lv), the Y axis is amplitude probability (APD), and the frequency (f) is a parameter, and at least one is a logarithmic function, A graph having at least one of the Rayleigh functions is generated (see the Rayleigh scale graph of FIG. 9 and the logarithmic scale graph of FIG. 10 for display examples). FIG. 9 shows an example in which the horizontal axis represents the Rayleigh scale amplitude probability at time t = 79 sec, and the vertical axis represents the amplitude linearly in dB. The designated marker is in the range of amplitude probability−60 dBm ≦ amplitude <−40 dBm. In position. FIG. 10 is an example in which time is t = 79 sec, the horizontal axis is linear (dB) logarithm, and the vertical axis is logarithmic scale, and the amplitude probability is expressed in logarithmic scale. It is in a position within the range.

  Although not particularly illustrated, the graph generation unit 310 can also generate a similar function graph for a PDF (probability density function) that is closely related to the APD.

(E) 3D display graphs This group of graphs is suitable for observing the overall trend in as many dimensions as possible, with the following (e-1) 3D-APD and (e-2) 3D-amplitudes .

(E-1) 3D-APD graph The amplitude range (Lv; level) is fixed to a specific value, and among the three axes, the X axis is the frequency and the axis in the depth direction (hereinafter referred to as “Y axis”) is time. , A graph in which the Z-axis is an amplitude probability (APD) (see FIG. 11 for a display example). FIG. 11 shows data when the amplitude range is observed at −60 dBm ≦ amplitude <−40 dBm (when fixed), and the designated marker is set at time t = 79 sec on the vertical axis.

(E-2) 3D-level graph The amplitude probability range (APD) is fixed to a specific value, and among the three axes, the X-axis is frequency, the Y-axis is time, and the Z-axis is amplitude (Lv; level) ( For display examples, see FIG. FIG. 12 shows data when the amplitude probability range is observed at 10% <APD ≦ 50% (when fixed), and the designated marker is set at time t = 79 sec on the vertical axis.

  As described above, the graph generation unit 310 displays the graph having the other one as a parameter on the coordinate having at least any two of frequency, amplitude, amplitude probability, and time as the previous graph on the display unit 400 ( When the first marker) is displayed, the designated marker generation unit 320 uses a specific value or a specific range in two dimensions or parameters on the first graph as a specific value. A second graph is generated and displayed for the dimensions and parameters of the new combination when the two dimensions specified by the specified marker from the operation unit 500 or the specific values of the parameters are fixed. As the second graph of the switching destination at that time, the frequency, amplitude, amplitude probability, and time, except for one designated as a specified value or parameter, a dimension is any two of the three. A new graph with the remaining one as a parameter on the coordinates is generated.

  Note that the graph generation by the graph generation unit 310 described above is arbitrarily designated for each screen in each display area even when a plurality of graphs are displayed on the same display screen of the display unit 400 by a multi-screen display function described later. And can be executed.

(F) Switching of graphs between groups FIG. 2 is a diagram illustrating switching between graphs. In switching, a specific value of a desired switching destination graph is specified with a specified marker on the switching source graph, and switching is performed by designating the corresponding graph.

  In other words, the graph displayed on the display unit 400 is switched by the screen control unit 330 instructing the graph generation unit 310 according to the graph request instruction from the operation unit 500. At that time, the screen control unit 330 operates in a state where specific values (or specific ranges) in two dimensions or parameters are specified as specific values by a specified marker on the graph displayed on the display unit 400. When receiving the switching instruction from the unit 500, the graph generation unit 310 displays a graph of the dimensions and parameters of a new desired combination when the two dimensions or parameters designated with the specific values are fixed to the specific values. Generate. An example is described next.

  A desired graph to be displayed is performed by selecting and instructing the graph names (graph types) from the above (a) to (e) on the operation unit 500. Hereinafter, individual switching will be described with reference to FIGS. 2 and 3 to 12.

(F-1) Switching from spectrogram display to spectrum display First, the graph of FIG. 5 (or FIG. 6) is displayed, and the designated marker designates time t = 79 sec on the time axis as a specific value. When switched to FIG. 4), the graph generation unit 310 sets the frequency (f) as the X-axis and the amplitude probability (or amplitude) as the Y-axis, and fixes time t = 79 sec as described in (a) above. Then, the amplitude and amplitude range (or amplitude probability and amplitude probability range) at time t = 79 sec are read from the storage unit 200, and a graph using the read amplitude and amplitude range (or amplitude probability and amplitude probability range) as parameters is obtained. Generate.

(F-2) Switching from spectrum display to spectrogram display First, the graph of FIG. 3 (or FIG. 4) is displayed, and the designated marker is amplitude probability range 10% <APD ≦ 50% (or amplitude range−60 dBm ≦ amplitude). <−40 dBm) is specified, and when switched to FIG. 5 (or FIG. 6), the graph generation unit 310 sets the X axis to the frequency (f), Y as described in (a) above. The axis is time, and the amplitude range in the amplitude probability range 10% <APD ≦ 50% (or the amplitude probability range in amplitude−60 dBm ≦ amplitude <−40 dBm) is read from the storage unit 200, and the read amplitude range (or amplitude probability range) ) As a parameter. At this time, in FIG. 5 (FIG. 6), a designation marker is attached at a position corresponding to the specific value t = 79 sec in FIG. 3 (or FIG. 4).

(F-3) Switching between chart display and spectrum display For example, it is possible to switch from the graph of FIG. 7 (or FIG. 8) to the graph of FIG. 3 (or FIG. 4) by specifying a specific value t = 79 sec. In FIG. 3 (or FIG. 4), the frequency can be specified as a specific value to switch the graph to FIG. 7 (or FIG. 8).

(F-4) Switching between chart display and spectrogram display Similarly, for example, switching between the graph of FIG. 5 (or FIG. 6) and the graph of FIG. Switching is possible by changing the two-dimensional and parameters of each graph while keeping the same amplitude range in the range of 10% <APD ≦ 50% (or amplitude probability range in the range of −60 dBm ≦ amplitude <−40 dBm). is there.

(F-5) Switching between function scale display and spectrum display For example, switching between the graph of FIG. 9 and the graph of FIG. 3 (or FIG. 4) is performed by keeping the specific value the same, for example, at time t = 79 sec. It is possible to switch by changing the two dimensions and parameters of each graph.

(F-6) Switching between function scale display and spectrogram display or chart display The specific value in the graph of FIG. 9, for example, the amplitude range in the amplitude probability range 10% <APD ≦ 50% (or −60 dBm ≦ amplitude <−40 dBm) Amplitude probability range) is designated, and the graph is switched to the graph of FIG. 5 (FIG. 6) or FIG. 7 (FIG. 8). Conversely, it is possible to set the time t = 79 sec as a specific value in the graph of FIG. 5 (FIG. 6) or FIG. 7 (FIG. 8) and switch to the graph of FIG. 9.

(F-7) Switching between 3D graphs (FIGS. 11 and 12) and other graphs FIG. 11 and FIG. 12 show that the specific value by the designated marker is time t = 79 sec in the Y axis (depth direction), Switching from this state to FIG. 3 (FIG. 4) is possible. By specifying a specific value of X axis = frequency or Z axis = amplitude probability (amplitude) with a specified marker, switching from FIG. 5 to FIG. 10 is possible. These reverse switching is also possible.

  Thereby, the operator can observe the graph developed around each gazing point by switching the graph. Moreover, the same observation can be performed by changing the gazing point.

(G) Switching of graphs within a group Switching within the same group in the graphs within the spectrum display group (FIGS. 3 and 4) and the graphs within the spectrogram display group (FIGS. 5 and 6) of FIG. 330 is an instruction from the operation unit 500 and can be achieved by switching the parameter to either the amplitude range or the amplitude probability range. Switching within the same group in the graph within the chart display group (FIGS. 7 and 8) and the graph within the 3D display group (FIGS. 11 and 12) is achieved by switching the Z axis to either amplitude or amplitude probability. it can. Switching between graphs in a function display group can be achieved by switching the function type.

  Note that, even in a state where a plurality of graphs are displayed on the display screen of the display unit 400 by a multi-screen display function by the multi-image display control unit 390 described later, any screen can be arbitrarily selected for each display area by the above-described method. You can switch graphs.

  The designation marker generation unit 320 can designate each dimension constituting the coordinates of each graph by an instruction from the operation unit 500 with respect to the graph displayed on the display screen of the display unit 400 (for example, FIG. 5). See). The specific value is fixed to a fixed value in the next switching destination graph, and a graph developed around the fixed value can be obtained.

  The designation marker generation unit 320 can designate not only the dimensions constituting the coordinates of each graph but also parameters (or scales thereof) according to instructions from the operation unit 500. Then, the specific value is fixed to the next fixed graph fixed value, and a graph developed around the fixed value can be obtained. For example, it is specified by placing a sub marker (as one type of specified marker) at the “amplitude probability range identification display” position, which is the parameter scale in FIG. 5, and the amplitude probability range specified by this sub marker is set as a specific value. You can also expand the following graph. Although the sub marker is set at the parameter scale in FIG. 5, it may be set at a position that directly points to the parameter in the graph (in the coordinates).

  The designated marker generation unit 320 can generate and display a single marker (MKR) or a plurality of multimarkers (MKR) in addition to the designated marker. FIG. 5 shows an example in which five markers are set on the X axis (frequency axis). In the case of FIG. 5, the numerical control unit 310 c reads out the frequency, amplitude (level) and amplitude probability (APD) at the multimarker point and at the specific value t = 79 sec from the storage unit 200. Display. That is, the single or multi-marker is for reading the data at the marker point numerically, and at the same time, can read and display data values other than the values displayed in the graph. An example of a single marker is shown in FIG.

  When a predetermined graph is displayed, the peak search unit 340 receives a specification of a range for searching for a peak from the operation unit 500 via the screen control unit 330 and obtains a peak position in the range. And the peak marker production | generation part 350 produces | generates the marker which shows a peak position on the displayed graph, and displays it on the display part 400. FIG. For example, when there is a peak marker display request in a range of 10% <APD ≦ 50% on a level chart (amplitude is vertical axis, time is horizontal axis) as shown in FIG. 340 accesses the storage unit 200 and searches for the X-axis and Y-axis positions at which the amplitude (level) at each frequency reaches a peak in a range of 10% <APD ≦ 50%, and at the same time, Read the amplitude probability. Then, the peak marker generation unit 350 generates and displays a marker indicating the peak position at the peak position, and the numerical control unit 310c displays the amplitude and the amplitude probability at the peak position (see white display in FIG. 13). .

  Since the peak marker indicates the maximum value of the parameter, the specific value of the parameter specified by the peak marker is specified as the specific value using the value specified by the peak marker instead of the specified marker, It is also possible to switch graphs as in (f) above.

  For example, when the graph of the level chart shown in FIG. 14A displays the change in amplitude from 5 minutes before the right end is the current time position (current time position), the full span control unit 310b performs measurement. When a request for observing a level change from the start is made from the operation unit 500, the full span control unit 310b that has received the request via the screen control unit 330 sends a measurement start time ( A level chart showing a level change from (0 time) to the current time (full span) is generated, for example, a graph shown in FIG. 14B and displayed on the display unit 400. The full span control has been described with the graph of the level chart, but it can be executed with the other graphs.

  The zone marker generation unit 360 generates and displays a marker indicating a zone at the position and width indicated by the operation unit 500 on the displayed graph. See the zone marker in FIG. When the zone is displayed on the graph, the enlargement / reduction control unit 310a that receives an enlargement instruction from the operation unit 500 via the screen control unit 330 enlarges the designated range of the graph (enlarges the image). The generated graph is generated by the graph generation unit 310 and is enlarged and displayed on the display unit 400. Refer to FIG. While displaying FIG. 14C, the enlargement / reduction control unit 310 a that has received the reduction instruction next time displays a graph obtained by reducing the specified range of the graph (reducing the image) in the graph generation unit 310. It is generated and displayed enlarged on the display unit 400 as shown in FIG. The zone marker and the enlargement / reduction control have been described with the graph of the level chart, but can be executed with other types of graphs.

  Note that the graph generation unit 310 does not particularly request a full span display request from the operation unit 500 via the full span control unit 310b or an enlargement / reduction display request from the operation unit 500 via the enlargement / reduction control unit 310a. A graph having a predetermined size (default value) is generated.

  The screen control unit 330 receives instructions from the operation unit 500 and controls each unit in the display control unit 300 as already described when describing each unit.

  The display control unit 300 includes a program that describes the functions and operations described above and a CPU that executes the program. 1 does not necessarily have to be as shown in FIG. 1, and moreover, in executing the above functions / operations or designing it, Reasonably reclassified and changed. The present invention is within the scope of the present invention as long as it is configured to execute the above functions and operations.

  The display unit 400 is configured by a display device mounted on the main body of the APD measurement display device 1 such as a liquid crystal display or a CRT, and the same display screen is displayed by display control of the display control unit 300 based on setting contents and instructions by the operation unit 500. A plurality of graphs are displayed above (multi-screen display function), various setting item screens related to APD measurement, display related to driving and various controls of the APD measurement display device 1 are performed.

  The operation unit 500 includes, for example, an operation key such as a numeric keypad and a selection button, a pointing device such as a mouse, a touch panel including a touch sensor for detecting a contact position by a contact operation on an input screen corresponding to the display screen of the display unit 400, and the like. It consists of various input devices. The operation unit 500 instructs to start and end the APD measurement, settings related to various graph displays based on the APD measurement result, division setting of the screen of the display area of the display unit 400, and graph to the screen of the designated display area of the display unit 400 It is operated by the operator when performing display instruction, parameter setting of various setting items related to APD measurement, instruction to change the count time of the timer of the clock generation unit 130a, classification instruction of amplitude probability by the range classification means 130b, etc. The corresponding setting contents and instructions are output to the display control unit 300.

  When performing APD measurement, the control unit 600 performs overall control of each part of the APD measurement display device 1, including various setting controls related to APD measurement to the APD measurement unit 100.

  Further, in the APD measurement display device 1 of this example, a display unit is selected by selecting any one of the spectrum display graph, the spectrogram display graph, the chart display graph, the function scale display graph, and the 3D display graph shown in FIG. When a display method is displayed on the display unit 400, a display method, a processing method, and a related graph display axis are set by operating a soft key (operation unit 500) displayed on the display screen of the display unit 400. In order for the graph display by the display method to be performed on the screen of the designated display area of the display unit 400, the measurement result data of all measurement channels is limited to the number of display points (the number of display pixels) on the screen of the designated display area. It has a function of generating a graph allocated on the display screen. Hereinafter, processing contents of the display methods shown in (1) to (8) will be described.

(1) Band average When the operation unit 500 is operated to set “band average” as the display method, “average processing” as the processing method, and “frequency axis” as the related graph display axis, all measurement channels (measurement frequencies) ) the APD measure of the number N _meas display points (frequency axis) number N _disp number divided by D = N _meas / N _disp minute measurement channel (measurement frequency) and averaging, APD average obtained by this averaging process A graph is generated in which values are assigned to each display point on the screen in the designated display area of the display unit 400.

The APD average value APD _k [i] of each threshold level L [i] at the display point CH _disp [k] is calculated by the following equation (1).

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], D = 4, the number of threshold levels: if 1024 is inputted in advance by operating the operation unit 500, as shown in table 1, 4-channel (D = 4) Averaging data is averaged, and an APD average value for one display point of the screen in the designated display area of the display unit 400 is calculated. Table 1 below shows average processing results of the measurement channels CH _disp [1] to CH _disp [4].

  Next, a display processing method when displaying the graph obtained by the above-described averaging process on the screen of the designated display area of the display unit 400 will be described with a specific example.

As described above, “band average” is selected as the display method by operating the operation unit 500, and the APD measurement values of the measurement channels (measurement frequencies) for the average number of measurement channels D set by the operation unit 500 are averaged. Then, a graph in which the APD average value obtained by the averaging process is assigned to each display point on the screen in the designated display area of the display unit 400 is generated and displayed. That is, using the display point n _disp = D × (N _disp / N _meas ), one data (APD average value for D channels) is displayed on the display unit 400. In the “band average”, as described below, the processing contents differ depending on the relationship between N _meas and N _disp .

When N _meas > N _disp FIG. 15 shows an APD spectrum display (horizontal axis: frequency, vertical axis: level, parameter: APD), the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], number of display points: N _disp = 1024, display point CH _disp [k] = CH _disp [1] to CH _disp [1024], average number of measurement channels: D = 4 (D ≧ An example of display processing when N _meas > N _disp ) is used. In this case, one data (an average value for 4 channels) is displayed on one display point of the display unit 400. In the example of FIG. 15, on the display point CH _disp [1] of the display unit 400, 1 data of an average value for 4 channels of the measurement channels CH _meas [1] to CH _meas [4] is displayed. Similarly, on the display point CH _disp [2] of the display unit 400, 1 data of the average value for 4ch of the next measurement channels CH _meas [5] to CH _meas [8] is displayed.

When N _meas ≦ N _disp FIG. 16 shows an APD spectrum display (horizontal axis: frequency, vertical axis: level, parameter: APD), the number of all measurement channels: N _meas = 256, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [256], number of display points: N _disp = 1024, display point CH _disp [k] = CH _disp [1] to CH _disp [1024], average number of measurement channels: D = 4 An example of display processing in the case of having been performed is shown. In this case, one data (average value for 4 channels) is displayed on display points: 16 points on the display unit 400. In the example shown in FIG. 15, on the display point _{CH disp [1] ~CH disp [} 16] of the display unit 400, displays the first data of the average value of 4ch amount measurement channel _{CH meas [1] ~CH meas [} 4] To do. Similarly, on the display point CH _disp [17] of the display unit 400 ~CH _disp [32], for displaying one data of the average value of 4ch fraction of the next measurement channel _{CH meas [5] ~CH meas [} 8] .

  In the example of FIGS. 15 and 16, the range of the APD that is a parameter is 0 <APD ≦ 1%, 1% <APD ≦ 10%, 10% <APD ≦ 50%, and 50% <APD.

  In the above description, the total number of measurement channels divided by the number of display points on the display area screen is an integer, or the number of display points on the display area screen divided by the total number of measurement channels is an integer. If there is a remainder without satisfying this condition, the APD measurement results are averaged so that the number of the remainders is eliminated, and the APD measurement results for the total number of measurement channels are displayed in the display area screen. The APD measurement result is displayed on the graph according to the number of display points.

  Further, the example in which the APD measurement result is averaged in the frequency axis direction, the APD data on each display point of the screen in the designated display area is calculated and displayed on the graph has been described. It is also possible to average the measurement results, calculate APD data on each display point on the screen in the designated display area, and display it on the graph.

(2) Fixed point selection (frequency axis data)
When “fixed point selection” as the display method, “decimation processing” as the processing method, and “frequency axis” as the related graph display axis are set by the operation of the operation unit 500, the number N _{meas of} all measurement channels (measurement frequencies) _{Is the} number of display points (frequency axis) divided by the number N _disp D = N _meas / N _disp APD measurement result for each measurement channel (measurement frequency) is selected, and the selected APD measurement result is designated on the display unit 400 Display on each display point on the screen in the selected display area. That is, the measurement result CH _meas [n] of the measurement channel at the fixed point D interval is displayed on each display point CH _disp [k] of the display unit 400. CH _disp [k] = CH _meas [(k−1) D + 1]

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], when D = 4 are input in advance by the operation of the operation unit 500, as shown in the following table 2, the data for each 4-channel (D = 4) Is displayed on each display point on the screen of the designated display area of the display unit 400.

(Time axis data)
When “fixed point selection” is set as the display method, “decimation processing” is set as the processing method, and “time axis” is set as the related graph display axis by the operation of the operation unit 500, all the measurement channels (measurement frequencies) A number obtained by dividing the measurement time T _meas by the number of display points (time axis) T _disp D = T _meas / T _disp. The APD measurement result for each measurement time is selected, and the selected APD measurement result is designated on the display unit 400. Display on each display point on the screen in the selected display area. That is, the measurement result APD_T _meas [t] of the measurement time of the fixed point D interval in each measurement channel is displayed on each display point APD_T _disp [k] on the screen of the designated display area of the display unit 400. APD_T _disp [k] = APD_T _meas [(k−1) D + 1]

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4 is input in advance by operation of the operation unit 500 As shown in Table 3 below, data for each measurement time of 4 seconds (D = 4) is displayed on each display point on the screen of the designated display area of the display unit 400.

(3) Selected APD value point selection (frequency axis data)
When “specified APD value point selection” is set as the display method, “decimation processing (maximum value or minimum value)” is set as the processing method, and “frequency axis” is set as the related graph display axis by the operation of the operation unit 500, The number of measurement channels (measurement frequency) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N _disp APD value specified from the APD measurement results of measurement channels (measurement frequencies) The APD measurement result of the measurement channel whose threshold level becomes “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point on the screen of the designated display area of the display unit 400. .

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], D = 4, designated APD value: if the APD> 0.01 are input in advance by the operation of the operation unit 500, as shown in table 4, From the four channels (D = 4), the APD measurement data of the measurement channel that maximizes the threshold level corresponding to the designated APD value is selected, and the selected APD measurement data is stored in the designated display area of the display unit 400. Display on each display point on the screen.

(Time axis data)
When “specified APD value point selection” is set as a display method, “decimation processing (maximum value or minimum value)” is set as a display method, and “time axis” is set as a related graph display axis by operation of the operation unit 500, In the measurement channel (measurement frequency), the specified APD value from the APD measurement result of the measurement time of D = T _meas / T _disp divided by the total measurement time T _meas divided by the number of display points (time axis) T _disp The APD measurement result of the measurement time at which the threshold level becomes “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point on the screen of the designated display area of the display unit 400. .

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4, designated APD value: APD> 0.01 When input is performed in advance by 500 operations, as shown in Table 5 below, the threshold value level corresponding to the designated APD value is maximized from the data for the measurement time of 4 seconds (D = 4). Time APD measurement data is selected, and the selected APD measurement data is displayed on each display point on the screen of the designated display area of the display unit 400.

(4) Selected level value point selection (frequency axis data)
When “specified level value point selection” is set as the display method, “decimation processing (maximum value or minimum value)” is set as the processing method, and “frequency axis” is set as the related graph display axis by the operation of the operation unit 500, The number of measurement channels (measurement frequency) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N _{disp A} specified threshold level from the APD measurement results of measurement channels (measurement frequencies) The APD measurement result of the measurement channel whose APD value is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point on the screen of the designated display area of the display unit 400.

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], D = 4, specified threshold level: if over 40dBm is inputted in advance by operating the operation unit 500, as shown in table 6, 4 channels ( D = 4), the APD measurement data of the measurement channel that maximizes the APD value at the designated threshold level is selected, and the selected APD measurement data is displayed on the screen of the designated display area of the display unit 400. Display on the point.

(Time axis data)
When “specified level value point selection” is set as the display method, “decimation processing (maximum value or minimum value)” is set as the display method, and “time axis” is set as the related graph display axis by the operation of the operation unit 500, in the measurement channel (measurement frequency), from the total measurement time T _meas a display point (time axis) number T _disp number divided by D = T _meas / T _disp worth of measurement time APD measurements, the specified threshold level The APD measurement result of the measurement time at which the APD value at “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point on the screen of the designated display area of the display unit 400.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4, specified threshold level: −40 dBm is the operation of the operation unit 500 As shown in Table 7 below, the APD measurement of the measurement time at which the APD value at the specified threshold level is maximum is selected from the data for the measurement time of 4 seconds (D = 4), as shown in Table 7 below. Data is selected, and the selected APD measurement data is displayed on each display point on the screen of the designated display area of the display unit 400.

(5) Peak value point selection (frequency axis data)
When “peak value point selection” is set as the display method, “decimation processing (maximum value or minimum value)” is set as the processing method, and “frequency axis” is set as the related graph display axis by the operation of the operation unit 500, all measurements are performed. The number of channels (measurement frequency) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N _disp of the APD measurement results of the measurement channels (measurement frequencies), the peak value level is “ The APD measurement result of the measurement channel that is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point on the screen of the designated display area of the display unit 400.

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], when D = 4 are input in advance by the operation of the operation unit 500, as shown in table 8, among the 4-channel (D = 4) The APD measurement data of the measurement channel with the maximum peak value level is selected, and the selected APD measurement data is displayed on each display point on the screen of the designated display area of the display unit 400.

(Time axis data)
When “peak value point selection” is set as the display method, “decimation processing (maximum value or minimum value)” is set as the display method, and “time axis” is set as the related graph display axis by the operation of the operation unit 500, each measurement is performed. In the channel (measurement frequency), the peak value level is “A” from the APD measurement result of the measurement time of D = T _meas / T _disp by dividing the total measurement time T _meas by the number of display points (time axis) T _disp. The APD measurement result of the measurement time that is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on each display point on the screen of the designated display area of the display unit 400.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4 is input in advance by operation of the operation unit 500 As shown in Table 9 below, APD measurement data of the measurement time at which the peak value level is maximum is selected from the data for the measurement time of 4 seconds (D = 4), and the selected APD measurement data is selected. Is displayed on each display point of the screen of the designated display area of the display unit 400.

(6) Instantaneous power average point selection (frequency axis data)
When the operation unit 500 is operated, “instantaneous power average value point selection” as a display method, “decimation process (maximum value or minimum value)” as a processing method, and “frequency axis” as a related graph display axis are set. Total number of measurement channels (measurement frequency) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N _disp APD measurement value from the APD measurement results of measurement channels (measurement frequency) The APD measurement result of the measurement channel whose instantaneous power average value calculated from “Max” or “Minimum” is selected, and the selected APD measurement result is displayed on each display point on the screen of the designated display area of the display unit 400. To display.

The average instantaneous power value of each measurement channel is calculated from the threshold level x _i [mW] and the APD value APD (x _i ) of each threshold level (number of levels X) by the following equation (2).

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], D = 4, the number of threshold levels: if X = 1024 is inputted in advance by operating the operation unit 500, as shown in table 10 below, 4-channel The APD measurement data of the measurement channel with the maximum instantaneous power average value is selected from (D = 4), and the selected APD measurement data is displayed on each display point on the screen of the designated display area of the display unit 400. To display.

(Time axis data)
By the operation of the operation unit 500, “instantaneous power average value point selection” as a display method, “decimation processing (maximum value or minimum value)” as a processing method, and “time axis” as a related graph display axis are set. For each measurement channel (measurement frequency), the APD measurement value is obtained from the APD measurement result of the measurement time of D = T _meas / T _disp by dividing the total measurement time T _meas by the number of display points (time axis) T _disp The APD measurement result of the measurement time at which the instantaneous power average value calculated from “Maximum” or “Minimum” is selected, and the selected APD measurement result is displayed on each display point on the screen of the designated display area of the display unit 400. To display.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], display point number: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4, threshold level number: X = 1024 If input in advance by operation, as shown in Table 11 below, the APD measurement data of the measurement time at which the instantaneous voltage average value is maximum is selected from the data for the measurement time of 4 seconds (D = 4). The selected APD measurement data is displayed on each display point on the screen of the designated display area of the display unit 400.

(7) Instantaneous voltage average value point selection (frequency axis data)
By operating the operation unit 500, “instantaneous voltage average value point selection” as a display method, “decimation processing (maximum value or minimum value)” as a processing method, and “frequency axis” as a related graph display axis are set. Total number of measurement channels (measurement frequency) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N _disp APD measurement value from the APD measurement results of measurement channels (measurement frequency) APD measurement result of the measurement channel whose instantaneous voltage average value calculated from “Maximum” or “Minimum” is selected, and this selected APD measurement result is displayed on each display point on the screen of the designated display area of the display unit 400. To display.

Note that the instantaneous voltage average value of each measurement channel is calculated from the threshold level x _i [μV] and the APD value APD (x _i ) of each threshold level (number of levels X) by the following equation (3).

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], D = 4, the number of threshold levels: if X = 1024 is inputted in advance by operating the operation unit 500, as shown in table 12 below, 4-channel The APD measurement data of the measurement channel having the maximum instantaneous voltage average value is selected from (D = 4), and the selected APD measurement data is displayed on each display point on the screen of the designated display area of the display unit 400. To display.

(Time axis data)
When the operation unit 500 is operated, “instantaneous voltage average value point selection” is set as a display method, “decimation processing (maximum value or minimum value)” is set as a processing method, and “time axis” is set as a related graph display axis. For each measurement channel (measurement frequency), the APD measurement value is obtained from the APD measurement result of the measurement time of D = T _meas / T _disp by dividing the total measurement time T _meas by the number of display points (time axis) T _disp The APD measurement result of the measurement time in which the instantaneous voltage average value calculated from “Maximum” or “Minimum” is selected, and the selected APD measurement result is displayed on each display point on the screen of the designated display area of the display unit 400. To display.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], display point number: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4, threshold level number: X = 1024 If input in advance by operation, as shown in Table 13 below, the APD measurement data of the measurement time at which the instantaneous voltage average value is maximum is selected from the data for the measurement time of 4 seconds (D = 4). The selected APD measurement data is displayed on each display point on the screen of the designated display area of the display unit 400.

(8) Peak-to-average power ratio (PAPR) point selection (frequency axis data)
When the operation unit 500 is operated, “peak-to-average power ratio point selection” is set as a display method, “decimation processing (maximum value or minimum value)” is set as a processing method, and “frequency axis” is set as a related graph display axis. , The number of measurement channels (measurement frequency) N _meas divided by the number of display points (frequency axis) N _disp D = N _meas / N _disp APD measurement results from the measurement channel (measurement frequency) of A _disp The APD measurement result of the measurement channel whose peak-to-average power ratio (PAPR) calculated from the value is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on the screen of the designated display area of the display unit 400 Display on each display point.

  The peak-to-average power ratio (PAPR) of each measurement channel is calculated by PAPR [dB] = peak power [dBm] −instantaneous power average value [dBm].

For example, the total number of measurement channels: N _meas = 4096, measurement channels CH _meas [n]: CH _meas [1] to CH _meas [4096], the number of display points: N _disp = 1024, the display points CH _disp [k] _{: CH disp [1] ~CH disp} [1024], when D = 4 are input in advance by the operation of the operation unit 500, as shown in the following table 14, among the 4-channel (D = 4) The APD measurement data of the measurement channel that maximizes the peak-to-average power ratio (PAPR) is selected, and the selected APD measurement data is displayed on each display point on the screen in the designated display area of the display unit 400. .

(Time axis data)
When the operation unit 500 is operated, “peak-to-average power ratio point selection” is set as a display method, “decimation processing (maximum value or minimum value)” is set as a processing method, and “time axis” is set as a related graph display axis. In each measurement channel (measurement frequency), APD measurement is performed from the APD measurement results of the measurement time corresponding to D = T _meas / T _disp by dividing the total measurement time T _meas by the number of display points (time axis) T _disp The APD measurement result of the measurement time when the peak-to-average power ratio (PAPR) calculated from the value is “maximum” or “minimum” is selected, and the selected APD measurement result is displayed on the screen of the designated display area of the display unit 400 Display on each display point.

For example, the total measurement time (measurement cycle: 1 second) in each measurement channel: T _meas = 4096, the measurement results APD_T _meas [t]: APD_T _meas [1] to APD_T in each measurement time (measurement cycle: 1 second) _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k]: APD_T _disp [1] to APD_T _disp [1024], D = 4 is input in advance by operation of the operation unit 500 As shown in Table 15 below, APD measurement data of the measurement time at which the peak-to-average power ratio (PAPR) is maximized is selected from the data for the measurement time of 4 seconds (D = 4). The selected APD measurement data is displayed on each display point on the screen of the designated display area of the display unit 400.

  Here, the thinning-out processing method when any of the display methods (2) to (8) described above is selected and set will be described in more detail with a specific example.

  When one of the display methods (2) to (8) is selected and set by operating the operation unit 500, the display selected and set from the APD measurement results for the thinning number D set by the operation unit 500 The APD measurement result selected according to the technique is displayed on each display point on the screen of the designated display area of the display unit 400.

Specifically, FIG. 17 shows an APD spectrum display (horizontal axis: frequency, vertical axis: level, parameter: APD), display method: selected APD value point selection, total number of measurement channels: N _meas = 256, measurement channel CH _{meas [n]: CH meas [1} ] ~CH meas [4096], display the number of points: n _disp = 1024, a display point _{CH disp [k] = CH disp} [1] ~CH disp [1024], the thinning number: D = 4 shows an example of display when the designated APD value: APD> 1% is used as a condition. In this case, the APD measurement data of the measurement channel that maximizes the threshold level corresponding to the designated APD value is selected from the four channels (D = 4), and the selected APD measurement data is designated on the display unit 400. Display on each display point on the screen in the display area. In the example of FIG. 17, of the four channels _{CH meas [1] ~CH meas [} 4], the specified APD value: APD> 1% and becomes the threshold level APD measuring measurement channels having the maximum data CH _meas [3 ] Is displayed at the display point CH _disp [1]. Similarly, from the following four channels _{CH meas [5] ~CH meas [} 8], specifies APD value: APD> APD measured data CH _meas measurement channels 1% and becomes the threshold level is maximum [6] Is displayed at the display point CH _disp [2].

FIG. 18 shows an APD chart display (horizontal axis: time, vertical axis: level, parameter: APD), display method: designated APD value point selection, total measurement time in each measurement channel (measurement cycle: 1 second): T _meas = 4096, measurement results at each measurement time (measurement cycle: 1 second) APD_T _meas : APD_T _meas [1] to APD_T _meas [4096], number of display points: T _disp = 1024, display point APD_T _disp [k] = APD_T A display example in the case where _disp [1] to APD_T _disp [1024], thinning number: D = 4, and designated APD value: APD> 1% is shown. In this case, the APD measurement data of the measurement time that maximizes the threshold level corresponding to the designated APD value is selected from the measurement time of 4 seconds (D = 4), and the selected APD measurement data is designated on the display unit 400. It is displayed on each display point of the screen of the designated display area. In the example of FIG. 18, measurement with the maximum threshold level at which the designated APD value: APD> 1% is obtained from the data APD_T _meas [1] to APD_T _meas [4] for the measurement time of 4 seconds (D = 4). The time APD measurement data APD_T _meas [3] is displayed at the display point APD_T _disp [1]. Similarly, from the data APD_T _meas [5] to APD_T _meas [8] for the next measurement time of 4 seconds (D = 4), the measurement time at which the threshold level at which the designated APD value: APD> 1% becomes maximum is obtained. APD measurement data APD_T _meas [6] is displayed at the display point APD_T _disp [2].

  According to the APD measurement result display processing function described above, all measurement result data is displayed using condition items (for example, average value, arbitrary APD value, peak level value, etc.) to be noticed from among all measurement result data. The display can be limited to the number of display points on the screen in the designated display area on the screen.

  In addition, since all the acquired measurement result data is stored in the storage unit 200, it is displayed in a limited manner on the graph display, but the location of the location indicated by the designated marker displayed by the designated marker generating unit 320 is displayed. Since the APD measurement result is numerically displayed on the display unit 400, all the APD measurement results at the location indicated by the designated marker can be visually confirmed.

  Further, the APD measurement / display apparatus 1 of the present example uses the setting contents and instructions regarding the graph display from the operation unit 500, the information from the graph generation unit 310, the enlargement / reduction control unit 310a, the full span control unit 310b, and the numerical control unit 310c. Based on this, a multi-screen display control function for displaying a plurality of graphs on the same screen of the display unit 400 is provided.

  Settings for the above graph display include graph types (spectrum display graph, spectrogram display graph, chart display graph, function display graph, 3D display graph), display format (horizontal axis, vertical axis, color) Band, color map), function scale display (logarithmic scale, function scale), scale display (default, full span, zoom), display method (band average, fixed point selection, specified APD value point selection, specified level value point selection, Peak value point selection, instantaneous power average value point selection, instantaneous voltage average value point selection, peak-to-average power ratio point selection), processing method (average processing, decimation processing), related graph display axes (frequency axis, time axis) and so on. Then, setting contents and instructions necessary for the graph display to be displayed are appropriately given from the operation unit 500. In this multi-screen display function, the display unit screen is divided and set according to the number of graphs to be displayed on the same screen of the display unit 400 by the operation unit 500, and the divided display region screen is displayed on the screen. You can specify the graph display.

  FIG. 19 shows an example in which different types of graphs are displayed on the same display screen by the multi-screen display function.

  In the following description, the active graph display means a graph display currently being watched by the operator in a plurality of graph displays displayed on the display screen of the display unit 400. In contrast, the inactive graph display means a graph display that is displayed on the display screen of the display unit 400 but is not currently being watched by the operator.

  In the example of FIG. 19, the graph type is “spectrum display graph” and the display format is “horizontal axis: frequency, vertical axis: as an inactive graph display on the screen 400 a in the upper display area of the display unit 400. Level, color band: APD range, Enlargement / reduction display is set to “Full span”, Display method is set to “Peak value point selection”, Processing method is set to “Decimation”, and the related graph display axis is set to “Frequency axis” The graph display is made. The screen 400b in the lower display area of the inactive graph display on the same display screen has a graph type “Spectrogram display graph” as an active graph display of a different type from the inactive graph display. Format is “horizontal axis: frequency, vertical axis: time, color map: level range”, enlargement / reduction display is “full span”, display method is “peak value point selection”, processing method is “decimation processing”, and related graph display A graph is displayed when the axis is set to “frequency axis”. Furthermore, the amplitude (level) and amplitude probability (APD) of the five multi-markers are displayed on the screen 400c in the display area below the active graph display on the same display screen.

  FIG. 20 shows an example in which the same type of graph is displayed on the same display screen by the multi-screen display function.

  In the example of FIG. 20, a thin-span-processed full-span graph is displayed as an active graph display on the screen 400 d in the lower display area of the display unit 400. In addition, the screen 400e in the upper display area of the full span graph display subjected to the thinning process on the same display screen has a range designated by the zone marker on the thin span processed full span graph display as the same type of graph display. The enlarged graph is displayed (no thinning process).

  Thus, according to the multi-screen display function, the screen of the display area of the display unit 400 is divided and set according to the number of graphs to be displayed on the same screen of the display unit 400. Select the type of graph to be displayed on the multi-screen from multiple types of graph display (spectrum display graph, spectrogram display graph, chart display graph, function display graph, 3D display graph). If the screen is designated, the selected graph is displayed on the screen in the designated display area, and a plurality of graphs are displayed on the same screen of the display unit 400 as a multi-screen. Each graph display on the same screen can be independently set from the operation unit 500 for its display format, function scale display, enlargement / reduction display, display method, processing method, and related graph display axes. As a result, a plurality of graphs combining frequency, amplitude, amplitude probability, and time parameters can be displayed on the same screen of the display unit 400, and the multi-channel APD measurement results can be analyzed in detail and effectively. Can be evaluated.

  By the way, the multi-screen display function described in the examples of FIG. 19 and FIG. 20 displays a plurality of graphs on the same display screen of the display unit 400 provided in the main body of the APD measurement display device 1. In addition to the display unit 400 provided in the main body of the display device 1, a plurality of graphs can be displayed by using an external display 700 indicated by a one-dot chain line in FIG.

  In this case, as shown in FIG. 1, the APD measurement display device 1 includes an input / output unit 800 as an interface for connecting an external device, and an external display 700 is connected to the input / output unit 800. The external display 700 can be configured with, for example, a liquid crystal display or a terminal device such as a personal computer equipped with a display. In the APD measurement display device 1 using this external display 700 together, the display of the main body and the external display 700 connected via the input / output unit 800 according to the setting contents related to the above-described graph display from the operation unit 500. A plurality of graphs are displayed by being distributed to the section 400. When setting the graph display from the operation unit 500, the number of screen divisions in the display area of the display unit 400 of the apparatus main body and the number of screen divisions in the display area of the external display 700 are set, respectively. The graph to be displayed on the screen can be arbitrarily specified.

  FIG. 21 shows an example when a plurality of types of graphs are displayed on the display unit 400 and the external display 700 of the APD measurement display device 1 using the multi-screen display function.

  In the display example of FIG. 21, on the display unit 400 of the APD measurement display device 1, a thinned spectrum display graph is displayed on the screen 400f in the lower display area as two types of graph displays. On the processed spectrum display graph, an enlarged display (no thinning process) of the graph specified by the marker indicated by the specified marker is displayed on the screen 400g in the upper display area. At the same time, for the external display 700, the spectrogram display graph is displayed on the screen 700a in the upper left display area and the chart display graph is displayed on the screen 700b in the lower left display area as function display. Is displayed on the screen 700c in the upper right display area, and a graph in 3D display is displayed on the screen 700d in the lower right display area.

  As described above, if the multi-screen display function by the APD measurement display device using the external display 700 in addition to the display unit 400 of the APD measurement display device 1 is adopted, the number of graphs that can be displayed is increased, and each graph display is displayed. Comparison and comparison of APD measurement results can be performed from various perspectives.

  The APD measurement / display apparatus 1 of this example analyzes the frequency component of the signal under measurement, detects the amplitude of each analyzed frequency component, and the amplitude probability per unit time for the detected amplitude of each frequency component. Is obtained every time, and the amplitude probability of the amplitude of each frequency component is stored in the storage unit 200 in correspondence with the time. That is, the simultaneous measurement technique of the time axis and the frequency axis of APD measurement in which data is acquired from the A / D conversion means 110b and the acquired data is processed in real time by short-time Fourier transform is applied. As a result, when using the above-described multi-screen display function, accurate frequency and time characteristic information can be acquired simultaneously, and not the simple display combination display as in the prior art, but the multi-screen display function described above enables simultaneous time and frequency. Display can be performed, and effective display can be realized without switching the display.

DESCRIPTION OF SYMBOLS 1 APD measurement display apparatus 100 APD measurement part 110 Frequency analysis part 110a Band selection means 110b A / D conversion means 110c Frequency selection means 120 Level detection part 130 APD part 130a Clock generation part 130b Range classification means 200 Storage part 300 Display control part 310 Graph generation unit 310a Enlargement / reduction control unit 310b Full span control unit 310c Numerical control unit 320 Designated marker generation unit 330 Screen control unit 340 Peak search unit 350 Peak marker generation unit 360 Zone marker generation unit 370 Display format storage unit 380 Coordinate information storage unit 390 Multi-screen display control unit 400 Display unit 500 Operation unit 600 Control unit 700 External display device 800 Input / output unit

Claims (4)

APD measurement unit (100) that analyzes the frequency components of the signal under measurement, detects the amplitude of each analyzed frequency component, and obtains the amplitude probability per unit time for each detected amplitude of the frequency component over time A storage unit (200) that stores the amplitude probability of each frequency component output by the APD measurement unit corresponding to the passage of time, a display unit (400), an operation unit (500), and the storage unit Based on the latest storage contents of the storage unit obtained by accessing the memory at a predetermined timing, the remaining one is a parameter having coordinates of two or three of frequency, amplitude, amplitude probability and time. And a display control unit (300) for displaying the graph on the display unit,
The APD measurement display device, wherein the display control unit displays a plurality of graphs combining the parameters of the frequency, the amplitude, the amplitude probability, and the time on the same screen of the display unit. The external display (700) is connected via an input / output unit (800), and the display unit (400) and the external display are distributed to display the plurality of graphs. APD measurement display device. Analyzing the frequency component of the signal under measurement, detecting the amplitude of each analyzed frequency component, obtaining the amplitude probability per unit time for the detected amplitude of each frequency component for each elapsed time, The amplitude probability of the amplitude is stored in correspondence with the passage of time, and the remaining one is set as a parameter in two or three dimensions of the frequency, amplitude, amplitude probability and time based on the latest stored contents. APD measurement display method for displaying a graph
An APD measurement display method comprising: displaying a plurality of graphs combining the frequency, the amplitude, the amplitude probability, and the time parameter on the same screen of the display unit (400). 4. The APD according to claim 3, further comprising the step of displaying the plurality of graphs in a distributed manner between the external display (700) and the display unit (400) connected via the input / output unit (800). Measurement display method.