JP6319964B2 - measuring device - Google Patents

Description

  The present invention relates to a measurement apparatus that converts a measurement signal into waveform data and displays the waveform on a display unit.

  There are various measuring apparatuses that display a waveform based on a measurement signal on a display unit. Examples of such a measuring device include a voltage measuring device that displays a voltage waveform, a current measuring device that measures a current waveform, a measuring device that measures an electrical characteristic value such as a power measuring device that displays a power waveform; Temperature measurement device that displays fluctuation waveform, humidity measurement device that displays fluctuation waveform of humidity, measurement device that measures environmental characteristics such as wind speed measurement device that displays fluctuation waveform of wind speed; length that displays fluctuation waveform of length Examples thereof include a measuring device that measures mechanical characteristics such as a thickness measuring device.

  In such a measuring apparatus, when the waveform data exceeds a limit value that can be displayed on the display unit, the waveform at the portion exceeding the limit value cannot be displayed on the display unit because it is located outside the display unit.

  For example, Patent Document 1 discloses that waveform data that overscales beyond the upper end (upper limit value) of the display unit (display surface) is converted into waveform data corresponding to the upper end of the display unit, and the lower end (lower limit of the display unit). Describes a waveform observation device that converts waveform data that overscales beyond the limit value) into waveform data corresponding to the lower end of the display unit. In this waveform observation apparatus, portions of the waveform that should not be displayed on the display unit after being overscaled are displayed in a line shape on the upper and lower ends of the display unit. Therefore, it is possible to know the location of the overscaled waveform portion. However, there is a problem that it is difficult for an operator to identify whether the waveform parts displayed at the upper end and the lower end are the correct display for the measurement signal or the overscaled part.

  For example, Patent Document 2 describes a waveform observation apparatus that erases an overflowed waveform portion without displaying it in a line shape at the upper end or the lower end. In this waveform observing device, the part of the waveform that overflows is not displayed in a line, so the operator can see that the part of the waveform that is displayed near the top or bottom is the correct display for the measurement signal, and the waveform is interrupted. It can be determined that the part that is overflowing is a part that has overflowed. However, since the overflowed waveform portion is not displayed and is not conspicuous, there is a problem that it is difficult for the operator to identify the overflow.

JP-A 61-057860 JP-A-61-105468

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a measuring apparatus that can clearly and reliably identify a portion of an overscaled waveform.

The measurement apparatus according to claim 1, which is made to achieve the above object, includes a measurement signal conversion unit that converts a measurement signal into waveform data, and a waveform from a signal from the measurement signal conversion unit. A display unit that displays a waveform by a display processing unit , and a non-display portion of the waveform that is hidden by the waveform data exceeding a limit value that can be displayed on the display unit from a signal from the measurement signal conversion unit a measuring apparatus equipped with a non-display region detection unit, the normal background and, wherein the waveform data is beyond the limits hidden sites the waveform data said waveform is displayed without exceeding the limit value A background display processing unit for displaying the background for the non-display part corresponding to the non -display part detected by the detection unit differently is provided.

The measuring apparatus according to claim 2 is the apparatus according to claim 1, wherein the background display processing unit includes a normal background on which the waveform is displayed and a display unit corresponding to the non-display part . The background is displayed in a distinguishable manner by at least one of a color difference, a color tone difference, a luminance difference, a pattern presence or absence, and a frame display presence, or a combination of two or more. It is characterized by that.

A measuring apparatus according to a third aspect is the one according to the first or second aspect, wherein when the waveform display processing unit displays a plurality of the waveforms, the background display processing unit The background for the non-display part is displayed so that it can be distinguished from the non-display part of the waveform.

A measuring apparatus according to a fourth aspect is the one according to the first or second aspect, wherein when the waveform display processing unit displays a plurality of the waveforms, the background display processing unit The background for the non-display part is displayed so that the overlapping range of the non-display part of the waveform can be distinguished.

  A measuring apparatus according to a fifth aspect is the apparatus according to any one of the first to fourth aspects, wherein the waveform display processing unit replaces the non-displayed portion with a line along the limit value as the waveform. It is characterized by being displayed as.

  According to the measuring apparatus of the present invention, the waveform data exceeds the limit value that can be displayed on the display unit (overscaled) to detect a non-display part of the waveform that is not displayed, and the background of this non-display part is By displaying the waveform in such a manner that it can be distinguished from the background of the range in which the waveform is displayed, the operator can clearly and clearly identify the portion of the waveform that is overscaled.

  The background of the range of the non-display portion of the waveform and the background of the range where the waveform is displayed are at least one of color tone, luminance difference, pattern presence or absence, and frame display presence / absence. In the case of displaying in a distinguishable manner by a combination of two or more, it becomes easier to visually recognize the overscaled range, so that it can be more reliably identified.

  When the waveform display processing unit displays multiple waveforms, if the background display processing unit displays the background of a non-displayed part so that it can be distinguished from which non-displayed part of the waveform, any waveform of the plurality of waveforms is displayed. Can be easily identified.

  When the waveform display processing unit displays a plurality of the waveforms, when the background display processing unit displays the background of the non-display part so that the overlapping range of the non-display parts of the plurality of waveforms can be distinguished, the non-display part overlaps. Even so, it is possible to easily identify which waveform of the plurality of waveforms is overscaled in which range.

  When the waveform display processing unit displays a line along the limit value as a waveform in place of the non-display portion, the location of the overscaled waveform is easily understood.

It is a block diagram of a measuring device to which the present invention is applied. It is a flowchart which shows operation | movement of the measuring apparatus to which this invention is applied. It is a display screen figure which shows the example of a display of the display part of the measuring apparatus to which this invention is applied. It is a display screen figure which shows the example of a display of the display part of the other measuring apparatus to which this invention is applied. It is a display screen figure which shows the example of a display of the display part of the other measuring apparatus to which this invention is applied.

  Hereinafter, although the form for implementing this invention is demonstrated in detail, the scope of the present invention is not limited to these examples.

  FIG. 1 shows a configuration of a measuring apparatus 1 to which the present invention is applied. The measuring apparatus 1 includes a measurement signal conversion unit 2, a waveform display processing unit 3, a non-display part detection unit 4, a background display processing unit 5, and a display unit 6, and a waveform based on the measurement signal (a waveform representing a measured value). Is displayed on the display unit 6.

  The measurement signal conversion unit 2 includes an ADC (analog / digital converter) 11 and a waveform data calculation unit 12, and corresponds to a waveform in which an analog measurement signal output from a measurement sensor (not shown) is displayed on the display unit 6. It converts to digital waveform data. As the measurement sensor, a known sensor suitable for the measurement target of the measurement apparatus 1 is used. The measurement sensor is, for example, a probe for detecting the voltage of the measurement object in contact with the measurement object, a current detection resistor, a clamp-type CT (current transformer) sensor, a temperature sensor, a humidity sensor, or the like. For example, when the measuring device 1 measures a power waveform of multiphase AC, voltage sensors and current sensors corresponding to the number of phases are used, and voltage and current measurement signals corresponding to the number of phases are sent to the measurement signal converter 2. Entered. When the measurement apparatus 1 performs measurement for a plurality of channels, a plurality of measurement signals corresponding to the number of channels are input to the measurement signal converter 2. When a plurality of measurement signals are input, a plurality of ADCs 11 are provided corresponding to the number of measurement signals. The measurement sensor may have a configuration built in the measurement device 1 or may be a configuration external to the measurement device 1. In the case of external attachment, the measurement sensor is detachably attached to the measurement apparatus 1 by a connector.

  The ADC 11 samples an analog measurement signal at a predetermined sampling period, converts it into a digital measurement signal along a time series, and outputs it. The waveform data calculation unit 12 performs a calculation to convert the digital measurement signal output from the ADC 11 into waveform data corresponding to the waveform displayed on the display unit 6. For example, when displaying a power waveform on the display unit 6, the waveform data calculation unit 12 calculates waveform data indicating the power waveform from the voltage and current measurement signals. For example, when displaying the maximum value waveform, the average value waveform, and the minimum value waveform of the current on the display unit 6, the waveform data calculation unit 12 displays the maximum value waveform, the average value waveform, and the minimum value waveform from the current measurement signal. Three types of waveform data shown are calculated. When the digital measurement signal output from the ADC 11 can be used as waveform data, the waveform data calculation unit 12 can be omitted.

  The waveform display processing unit 3 displays waveform data on the display unit 6 as a waveform. The waveform display processing unit 3 generates an image in which waveform data is drawn as a graph (waveform) in correspondence with the vertical axis and the horizontal axis for displaying the waveform.

  The non-display part detection unit 4 detects a part of the waveform (non-display part) that is not displayed when the value of the waveform data exceeds the limit value that can be displayed on the display unit 6. The limit value is set as an upper limit value and / or a lower limit value for the waveform data. For example, when the waveform is drawn in the direction of the horizontal axis as in the case where the horizontal axis for displaying the waveform is the time axis, the limit value is set by the upper limit value / or the lower limit value of the vertical axis. When the waveform is drawn in the vertical axis direction, the limit value is set as an upper limit value or a lower limit value on the horizontal axis.

  When the non-display part detection unit 4 detects the non-display part, the waveform display processing unit 3 may display a line along the limit value as a waveform instead of the non-display part of the waveform. In this case, the waveform display processing unit 3 displays the waveform by replacing the waveform data corresponding to the non-display part with the limit value. Note that the waveform display processing unit 3 does not have to display the waveform of the non-display region as a line. In this case, the waveform is not displayed in the range of the non-display part.

  The background display processing unit 5 generates a background image of the waveform display area to be displayed on the display unit 6. The background display processing unit 5 displays the background of the display unit 6 corresponding to the non-display part detected by the non-display part detection unit 4 and the background of the display unit 6 in which the waveform data is displayed as a waveform without exceeding the limit value. , Display differently in a distinguishable manner. The waveform image generated by the waveform display processing unit 3 and the background image generated by the background display processing unit 5 are overlapped and displayed on the display unit 6. The waveform display processing unit 3 and the background display processing unit 5 may be integrated. Either the waveform display processing unit 3 or the background display processing unit 5 generates other images such as a display scale such as a vertical scale, a horizontal scale, axis scale values, scale lines, and markers in addition to the waveform and background. May be.

  As an example, the waveform data calculation unit 12, the waveform display processing unit 3, the non-display part detection unit 4, and the background display processing unit 5 are operated when one or more CPUs (central processing units) are operated by software. It is configured.

  The display unit 6 is a liquid crystal panel, plasma panel, CRT (cathode ray tube) or the like having a display screen capable of displaying an image.

  As shown in the figure, the measuring apparatus 1 may include a memory 7. The memory 7 is a rewritable nonvolatile memory such as a semiconductor memory or a hard disk. As indicated by a broken line in the figure, the waveform data output from the measurement signal conversion unit 2 is recorded in the memory 7, and the waveform data recorded in the memory 7 is output to the waveform display processing unit 3 and the non-display part detection unit 4. You may make it do. Alternatively, the memory 7 may record the digital measurement signal output from the ADC 11 and output it to the waveform data calculation unit 12. The memory 7 may record the image displayed on the display unit 6.

  Next, the operation of the measuring apparatus 1 will be described. FIG. 2 shows a flowchart showing the operation of the measuring apparatus 1.

  In the measuring apparatus 1, the measurement signal converter 2 acquires the measurement signal in step S1, and converts it into digital waveform data in step S2. Then, it progresses to step S3 and the non-display site | part detection part 4 discriminate | determines whether waveform data has exceeded the limit value. In step S3, for example, the waveform data for one screen displayed on the display unit 6 is determined. If it is determined in step S3 that the waveform data exceeds the limit value, the process proceeds to step S4, where the background display processing unit 5 uses the background of the display unit 6 corresponding to the measurement data exceeding the limit value as the normal background. Is displayed on the display unit 6 with a background for a non-display region different from the above. Then, it progresses to step S5, the waveform display process part 3 substitutes the waveform data which exceeded the limit value with a limit value, and progresses to step S7. If it is determined in step S3 that the waveform data does not exceed the limit value, the process proceeds to step S6, where the background display processing unit 5 uses the background of the display unit 6 corresponding to the waveform data that does not exceed the limit value as the normal background. And the process proceeds to step S7.

  In step S7, the waveform display processing unit 3 displays the waveform data on the display unit 6 as a waveform. This completes the waveform and background display processing.

  A specific example is shown in FIG. As an example, the figure shows a display screen 21 of the display unit 6 of the measuring apparatus 1 capable of measuring voltage, current, and power. The display screen 21 displays a waveform display area 22 that is a waveform (graph) plot area and an information display area 23 that displays various information. In the waveform display area 22, a vertical scale Y, a horizontal scale X, and a scale line H are also displayed. The vertical scale Y is the current axis. In this example, the measurement range is set to the 500 mA range, and the vertical axis scale Y is set to 0 to 500 mA. The horizontal scale X is a time axis. The measurement range can be switched by operating an operation unit (not shown). When the measurement range is switched, the measurement signal conversion unit 2, the waveform display processing unit 3, the non-display part detection unit 4, and the background display processing unit 5 (see FIG. 1) operate corresponding to the measurement range, and the measurement range The vertical axis scale Y is also changed and displayed so as to correspond to.

  The figure schematically shows an example in which a waveform W1 indicating the maximum value of the current, a waveform W2 indicating the average value of the current, and a waveform W3 indicating the minimum value of the current are displayed in the waveform display region 22. Yes.

  The limit value at which the waveforms W1 to W3 can be displayed in the waveform display area 22 is, for example, 130% of the maximum value of the scale displayed on the vertical scale Y (500 mA corresponding to the measurement range in this example) ( In this example, it is preset to 650 mA). This limit value is an upper limit value, and a portion of the waveform exceeding the upper limit value (non-display portion) is not displayed in the waveform display area 22. In other words, the upper end value of the waveform display area 22 is the upper limit value. Since the minimum value of the waveform data of the waveforms W1 to W3 does not become smaller than 0 mA, the lower limit value is not set as the limit value. As described above, the limit value is set as the upper end value (and / or lower end value) of the waveform display region 22 or the ratio to the vertical scale Y.

  As shown in the figure, the waveforms W <b> 1 to W <b> 3 exceed the limit value in the range of the time t <b> 1 to t <b> 2 on the horizontal axis scale X and are not displayed in the waveform display area 22. The non-display region detection unit 4 (see FIG. 1) detects a non-display region between times t1 and t2, and the background display processing unit 5 (see FIG. 1) does not display in the waveform display region 22 in the range between times t1 and t2. The background E1 for the display part is displayed. Since the waveforms W1 to W3 exceed the limit value in the range of the time t3 to t4 on the horizontal scale X, the background display processing unit 5 adds the background E2 for the non-display part to the waveform display region 22 in the range of the time t3 to t4. Display. The backgrounds E1 and E2 for the non-display region are displayed in a strip shape (vertical strip shape) that extends from the upper end to the lower end of the waveform display region 22. The background display processing unit 5 displays a normal background N in the range where the waveforms W1 to W3 are displayed. In the figure, the backgrounds E1 and E2 are indicated by hatching in order to show the backgrounds E1 and E2 for the non-display parts by a diagram.

  The background display processing unit 5 (see FIG. 1) displays the background E (E1, E2) for the non-display region when any one of the plurality of waveforms W1 to W3 exceeds the limit value.

  The background display processing unit 5 makes the background E for the non-display part and the normal background N at least one of a difference in color tone, a difference in luminance, a presence or absence of a pattern, and a presence or absence of a frame display. Or, it is preferable that the display is made easy and distinguishable by visual recognition by a combination of two or more. In addition, the background display processing unit 5 is different in color tone and / or luminance so that the operator can easily see the waveforms W1 to W3, the vertical axis scale Y, the horizontal axis scale X, and the auxiliary scale line H. It is preferable to display the background E for the non-display region. For example, when the normal background N is black, the vertical scale Y, the horizontal scale X, and the auxiliary scale line H are displayed in white, the waveform W1 is red, the waveform W2 is yellow, and the waveform W3 is blue The background E for the non-display region is displayed in a color different from any of these colors (for example, gray (gray)). The background E for the non-display region may be displayed so as to blink by repeating display and non-display at a constant cycle.

  In this way, by displaying the background E for the non-display part different from the normal background N in order to show the non-display part of the waveform, the operator can clearly recognize the parts of the waveforms W1 to W3 exceeding the limit values. Can be reliably identified.

  As shown in the figure, the background display processing unit 5 covers the entire waveform display region 22 in a range corresponding to the non-display region so that the background E for the non-display region reaches from the upper end to the lower end of the waveform display region 22. If the display is made different from the normal background N, it is preferable because the display area of the background E for the non-display region is increased and the operator can easily recognize it. In addition, only a part of the background corresponding to the non-display part of the waveform, such as the background E for the non-display part from the upper end to the center of the waveform display area 22, or from the center to the lower end of the waveform display area 22, It may be displayed differently from the normal background N. The background E for the non-display region may be extended and displayed outside the waveform display region 22.

  The waveform display processing unit 3 (see FIG. 1) displays the non-displayed portions of the waveforms W1 to W3 connected by a line L along the limit value. For example, the portion of the waveform W1 surrounded by the round frame S in the drawing is close to the upper end of the waveform display region 22. Conventionally, it is unknown whether this part is a waveform that has been replaced by the line L beyond the limit value, or a waveform in which the measurement signal is correctly displayed. To confirm, for example, a marker M is displayed. Therefore, it was necessary to confirm the value of the waveform W1. However, in the present invention, as shown in the figure, since the background E of the non-display part is not displayed for the waveform W1 of the round frame S, the operator correctly displays the measurement signal in the part of the round frame S. It is possible to easily identify that the waveform is the same.

  FIG. 4 shows another specific example. The figure shows, as an example, a display screen 21 of the display unit 6 of the measuring apparatus 1 (digital oscilloscope) that measures voltage waveforms with multiple channels. In this example, the entire display screen 21 is a waveform display area 22 which is a waveform plot area. The upper end Up of the waveform display area 22 is an upper limit value (as an example, 5 V) of the vertical axis scale, and the lower end Lo of the waveform display area 22 is a lower limit value (as an example, −5 V) of the vertical axis scale. The center C of the waveform display region 22 is the median value of the vertical scale (0 V as an example).

  In the waveform display area 22, the waveform display processing unit 3 (see FIG. 1) displays a plurality of waveforms W11 and W21. In the waveform W11, the range from time t13 to t14 on the horizontal axis (time axis) exceeds the upper limit value to become a non-display part, and the range from time t15 to t16 exceeds the lower limit value to become a non-display part. . The non-display part detection unit 4 detects a non-display part for each of the waveforms W11 and W21. As shown in FIG. 1, the background display processing unit 5 (see FIG. 1) displays the background E11a for the non-display region as the background in the range of times t13 to t14, and as the background in the range of times t15 to t16. The background E11b for the non-display part is displayed. The background display processing unit 5 displays a normal background N as the background of the waveform display area 22 in the range where the waveform W11 is displayed.

  As described above, when the waveforms W11 and W21 may exceed the upper and lower ends of the waveform display region 22, the upper limit value and the lower limit value are set as the limit values, and the background E11a for the non-display region is set in the exceeded range. , E11b is displayed.

  In the waveform W21, the range of time t11 to t12 on the horizontal axis exceeds the upper limit value to be a non-display part, and the background display processing unit 5 displays the background E21 for the non-display part in this range. The background display processing unit 5 may display the backgrounds E11a, E11b, and E21 for the non-display parts in the same color tone or the like, but does not display the backgrounds E11a and E11b for the non-display parts of the waveform W11 and the waveform W21. The site background E21 may be displayed with a different color tone or the like so as to be distinguishable. For example, when displaying the waveform W11 in red and the waveform W21 in yellow, the backgrounds E11a and E11b are displayed in gray mixed with red, and the background E21 is displayed in gray mixed with yellow.

  As described above, when the backgrounds E11a and E11b for the non-display parts are displayed differently from the background E21, the operator can easily determine which of the plurality of waveforms W11 and W21 exceeds the limit value. Can be identified.

  FIG. 5 shows another specific example. This figure is an example in which a plurality of other waveforms W31 and W41 are displayed on the display screen 21 shown in FIG. As shown in the figure, a background E31 for a non-display part is displayed for the waveform W31, and a background E41 for a non-display part is displayed for the waveform W41. The background E31 and the background E41 for the non-display region overlap in a part of the range, and the overlapping range is the background EE. When displaying the background E31 and the background E41 in the same color tone, for example, the background display processing unit 5 (see FIG. 1) displays the background EE in the same color tone as the backgrounds E31 and E41 so that the background EE can be distinguished. However, it is preferable that the information is displayed in a distinguishable manner. For example, it is preferable that the background display processing unit 5 displays the color tone, brightness, and pattern of the background EE in a color tone that is the sum of the color tone of the background E31 and the color tone of the background E41. When the background display processing unit 5 displays the background E31 and the background E41 for the non-display region in the same color (for example, gray), the background EE is displayed in a dark color (for example, dark gray) obtained by adding the colors. , May be distinguishable. Although not shown, when the backgrounds for the three non-display parts overlap, they are displayed in a darker color. In addition, when the background display processing unit 5 displays the background E31 for the non-display part in different colors such as gray mixed with red and the background E41 mixed gray with yellow, the background EE is displayed in orange (red and yellow). May be displayed in gray with mixed colors) to make them distinguishable.

  Thus, when the background EE in the range where the background E31 and the background E41 for the non-display part overlap is displayed so as to be distinguishable, the operator can limit which waveform of any of the plurality of waveforms W31 and W41 is in which range. Can be easily identified.

  The display positions of the waveforms W1 to W41 shown in FIGS. 3 to 5 on the display screen 21 are moved (scrolled) in the horizontal axis direction by operating the operation unit such as an arrow key or a rotary dial, or the waveform When W1 to W41 are displayed in real time and moved with the passage of time, the display positions of the backgrounds E1 to E41 for the non-display parts are also moved together with the movement of the display positions of the waveforms W1 to W41. When the waveforms W1 to W41 are enlarged / reduced by operation of the operation unit, the backgrounds E1 to E41 for the non-display parts are also enlarged / reduced and displayed.

  Further, it may be possible to set whether or not to display the backgrounds E1 to E41 for displaying non-display parts shown in FIGS. 3 to 5 with respect to the background display processing unit 5 by operating the operation unit. The presence / absence of the display may be set for each of the waveforms W1 to W41, or may be set for the waveforms W1 to W41 simultaneously displayed in the display screen 21. When a plurality of non-display part display backgrounds E11a and E11b are displayed for one waveform W11, the presence or absence of display may be set for each of the backgrounds E11a and E11b. In addition, when the image including the waveforms W1 to W41 displayed on the display unit 6 can be recorded on an external recording medium such as a USB memory, an SD card memory, or a CD-RW, for example, the backgrounds E1 to E41 are displayed. The presence or absence may be settable. Moreover, it is preferable that the color tone, brightness, pattern, and presence / absence of frame display of the backgrounds E1 to E41 can be changed by operating the operation unit. The color tone or the like of the normal background N may be changed.

  1 is a measurement device, 2 is a measurement signal conversion unit, 3 is a waveform display processing unit, 4 is a non-display part detection unit, 5 is a background display processing unit, 6 is a display unit, 7 is a memory, 11 is an ADC, and 12 is a waveform. Data calculation unit, 21 is a display screen, 22 is a waveform display area, 23 is an information display area, C is a center, E1 to E41 are backgrounds for non-display parts, and EE is a background in a range where backgrounds for non-display parts overlap each other , H is a scale line, L is a line along a limit value, Lo is a lower end, M is a marker, N is a background of a waveform display range (ordinary background), S is a round frame, t1 to t16 are time axis Time, Up is the upper end, W1 to W41 are waveforms, X is a horizontal scale, and Y is a vertical scale.

Claims (5)

A measurement signal conversion unit that converts measurement signals into waveform data, a display unit that displays a waveform from a signal from the measurement signal conversion unit by a waveform display processing unit, and a signal from the measurement signal conversion unit that can be displayed on the display unit A measuring device including a non-display part detection unit that detects a non-display part of the waveform that is not displayed when the waveform data exceeds a limit value,
A normal background in which the waveform data is displayed without the waveform data exceeding the limit value;
The background for the non-display part corresponding to the non -display part detected by the non-display part detection unit when the waveform data exceeds the limit value,
A measuring apparatus comprising a background display processing unit for displaying differently . Said background display processing unit, a normal background the waveform is displayed, the background in the display portion corresponding to the non-display region, a color difference, hue difference, difference in luminance, the presence or absence of patterns or different The measurement apparatus according to claim 1, wherein the display is made distinguishable by at least one of the presence or absence of frame display, or a combination of two or more. When the waveform display processing unit displays a plurality of the waveforms,
Said background display processing unit, distinguishable whether hidden sites of any of the waveform measuring apparatus according to claim 1 or 2, characterized in that to display the background for hidden sites. When the waveform display processing unit displays a plurality of the waveforms,
The measurement apparatus according to claim 1, wherein the background display processing unit displays a background for the non-display portion so that a range in which the non-display portions of the plurality of waveforms overlap can be distinguished.   The measurement apparatus according to claim 1, wherein the waveform display processing unit displays a line along the limit value as the waveform instead of the non-display portion.

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