JP3269517B2 - Waveform observation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a waveform observing device such as a digital oscilloscope, and more particularly to a waveform observing device having improved display of enlarged waveform data.

[0002]

2. Description of the Related Art A conventional waveform observation device such as a digital oscilloscope stores measured waveform data in its waveform storage circuit and displays the waveform on a display such as a CRT (Cathode Ray Tube).

The display device has a function of not only displaying the entire waveform data stored in the waveform storage circuit but also displaying an enlarged portion of an arbitrary portion.

FIG. 8 is a configuration block diagram showing an example of such a conventional waveform observation apparatus. In FIG. 8, 1 is A /
D converter, 2 is a waveform storage circuit, 3 is a control circuit, 4 is a setting circuit, 5 is a display, and 100 is an input waveform.

[0005] The input waveform 100 is input to the A / D converter 1, and the output of the A / D converter 1 is connected to the waveform storage circuit 2. Further, the waveform storage circuit 2, the setting circuit 4, and the display 5 are mutually connected to the control circuit 3, and the control signal from the control circuit 3 is connected to the A / D converter 1.

The operation of the conventional example shown in FIG. 8 will be described with reference to FIG. FIG. 9 is an explanatory diagram showing an example of a conventional waveform display on the display device 5.

The input waveform 100 is converted into a digital signal by the A / D converter 1 and is sequentially stored in the waveform storage circuit 2. The control circuit 3 reads out the waveform data from the waveform storage circuit 2, performs necessary arithmetic processing and the like, and causes the display 5 to display the input waveform 100.

FIG. 9A shows an input waveform 10 of two channels.
0 is shown, and FIGS. 9B and 9C are enlarged waveforms of an arbitrary part of the input waveform.

The user operates the setting circuit 4 in FIG.
By operating the markers indicated by "a", "b", "c" and "d", an arbitrary part to be enlarged and displayed is selected.

When such a selection operation is performed, the control circuit 3 divides the screen of the display 5 into three along the horizontal axis and displays the input waveform 100 and two enlarged waveforms, as shown in FIG.

Accordingly, FIG. 9 (b) shows an enlarged waveform of the portion of the input waveform 100 shown in FIG. 9 (a) surrounded by the markers "a" and "b", and FIG. In the input waveform 100 of FIG. 9A, enlarged waveforms of portions surrounded by the markers "c" and "d" are respectively displayed.

As a result, by operating the marker by the setting circuit 4 to enlarge and display the waveform of an arbitrary portion of the input waveform 100 which is desired to be noticed, more detailed waveform observation becomes possible.

[0013]

However, in the conventional waveform observation apparatus, if the portion to be enlarged further increases, the number of divisions of the screen of the display 5 increases, and the display resolution in the vertical axis direction decreases, making it difficult to observe the waveform. There was the problem I mentioned.

In order to avoid this problem, only one enlarged display is required or the input waveform 100 shown in FIG.
It is necessary to take measures such as ending the display of. However, in this case, there is a problem that the display resolution in the vertical axis direction is improved, but the whole image is difficult to grasp. Therefore, an object of the present invention is to realize a waveform observation device capable of improving the display resolution in the vertical axis direction of a display waveform while grasping the entire image.

[0015]

According to a first aspect of the present invention, a measured input waveform is stored in a waveform storage circuit, and the input waveform is stored in a display based on the stored data. In a waveform observation apparatus for displaying, an A / D converter for converting an input waveform into a digital signal,
A waveform storage circuit for storing the output of the D converter, a display for displaying the input waveform based on the output of the waveform storage circuit, and a setting circuit for selecting a plurality of arbitrary portions of the input waveform on the screen of the display Controlling the A / D converter, the waveform storage circuit, the display and the setting circuit, dividing the display screen along the horizontal axis, displaying the input waveform on one of the divided screens, and dividing the display screen on the other. A control circuit for displaying an enlarged waveform of an arbitrary portion of the input waveform selected plurally on a screen obtained by further dividing the screen along the vertical axis.

In order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the present invention, there is provided a control circuit for simultaneously displaying the enlarged position display means when the enlarged waveform is displayed on a full screen. It is assumed that.

[0017]

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a waveform observation apparatus according to the present invention.

In FIG. 1, 1, 2, 4, 5 and 100 are denoted by the same reference numerals as in FIG. 8, and 6 is a control circuit.

The input waveform 100 is input to the A / D converter 1, and the output of the A / D converter 1 is connected to the waveform storage circuit 2. Further, the waveform storage circuit 2, the setting circuit 4, and the display 5 are mutually connected to the control circuit 6, and the control signal from the control circuit 6 is connected to the A / D converter 1.

The operation of the embodiment shown in FIG. 1 will be described with reference to FIG. FIG. 2 is an explanatory diagram showing an example of waveform display on the display 5.

The input waveform 100 is converted into a digital signal by the A / D converter 1 and stored in the waveform storage circuit 2 sequentially. The control circuit 6 reads the waveform data from the waveform storage circuit 2 and performs necessary arithmetic processing and the like, and then causes the display 5 to display the input waveform 100.

FIG. 2A shows input waveforms of two channels, respectively, and FIGS. 2B and 2C show enlarged waveforms of arbitrary portions of the input waveform.

The user operates the setting circuit 4 in FIG.
By operating the markers indicated by "a", "b", "c" and "d", an arbitrary part to be enlarged and displayed is selected.

When such a selection operation is performed, the control circuit 6 makes a display as shown in FIG. That is, the control circuit 6 divides the screen of the display 5 into two along the horizontal axis, and displays the input waveform 100 on one part of the two divided screens.

Further, the control circuit 6 further divides the other portion of the two-split screen along the vertical axis by a portion indicated by "e" in FIG. 2 and displays an enlarged waveform on each of the split screens.

Accordingly, FIG. 2 (b) shows an enlarged waveform of a portion of the input waveform 100 shown in FIG. 2 (a) enclosed between the markers "a" and "b", and FIG. The enlarged waveforms of the portions surrounded by the markers “C” and “D” in the input waveform 100 of FIG. 2A are respectively displayed.

Even if the portion to be enlarged further increases, the control circuit 6 only has to divide the other portion of the two-split screen in multiples along the vertical axis, so that the display resolution in the vertical axis direction decreases. There is no.

As a result, the entire screen is grasped by dividing the divided screen other than the input waveform display section along the vertical axis and displaying an enlarged waveform of an arbitrary portion of the input waveform selected by the marker operation. In addition, it is possible to improve the vertical display resolution of the display waveform.

When observing an abnormal phenomenon or the like in the waveform using the embodiment shown in FIGS. 1 and 2, a suspicious portion on the input waveform 100 is selected by a marker or the like, and as shown in FIG. A more detailed waveform analysis is performed by enlarging and displaying only the point of interest on the entire screen of the display 5.

However, in this situation, it is not known which part of the input waveform 100 corresponds to the portion where the abnormal phenomenon has occurred. To confirm this, the input waveform 100 and the enlarged waveform shown in FIG. There is a problem that it is necessary to return to the mixed display once.

FIG. 3 is an explanatory view showing a display example for solving this problem. FIGS. 3A and 3B are enlarged waveforms of an arbitrary portion of the input waveform 100. FIG.

As described above, the user operates the markers indicated by "a", "b", "c" and "d" in FIG. 2 by the setting circuit 4 to select an arbitrary part to be enlarged and displayed. Display on the display 5 as shown in FIG.

Further, the user operates the setting circuit 4 as shown in FIG.
Instruct full-screen display of the enlarged waveforms of (b) and (c).

When such an operation is performed, the control circuit 6 divides the screen of the display 5 into two along the horizontal axis as shown in FIG. 3, and displays two enlarged waveforms on the two divided screens.

Further, the control circuit 6 displays enlarged position display means such as a zoom bar as shown by "A" in FIG.
The length of the enlarged position display means indicates the entire length of the input waveform 100, and "b" and "c" in FIG.
Is a marker indicating which part of the image is enlarged.

Accordingly, FIG. 3 (a) shows an enlarged waveform corresponding to the portion "b" in FIG. 3, and FIG. 3 (b) shows an enlarged waveform "c" in FIG.
Will be displayed respectively.

As a result, even when only the point of interest is displayed on the entire screen of the display 5 and a more detailed waveform analysis is performed, the enlarged position display means is displayed at the same time.
It is possible to grasp which portion of the input waveform 100 the current enlarged portion corresponds to.

In a waveform observation device such as a digital oscilloscope, there is a method of displaying a Lissajous waveform in "XY" display and observing the Lissajous waveform in order to measure a relationship between two waveform signals.

FIGS. 4 and 5 are explanatory views showing examples of conventional display of a Lissajous waveform. FIG. 4A shows input waveforms 100 of two channels, respectively.
(B) is a Lissajous waveform based on the input waveform 100.
FIG. 5 is a full-screen display of the Lissajous waveform of FIG. 4B.

However, in the conventional "XY" display, since "XY" is displayed using the entire range of the input waveform 100, a Lissajous waveform in an arbitrary portion of the input waveform 100 cannot be displayed. Was.

Here, FIGS. 6 and 7 are explanatory diagrams showing display examples of Lissajous waveforms which solve this problem. FIG.
6A shows input waveforms 100 of two channels, respectively, and FIG. 6B shows a Lissajous waveform based on the input waveform 100. FIG. 7 is a full-screen display of the Lissajous waveform of FIG. 6B.

The user operates the markers indicated by "A" and "B" in FIG. 6 by the setting circuit 4 to select an arbitrary portion of the input waveform 100 to be displayed as "XY".

When such an operation is performed, the control circuit 6 places the lower half of the display 5 in FIG. 6 as shown in FIG.
A Lissajous waveform based on the input waveform selected between "a" and "b" is displayed.

When the user instructs the setting circuit 4 to display the full-screen display of the Lissajous waveform, the Lissajous waveform is displayed on the full screen of the display 5 as shown in FIG.

As a result, an arbitrary portion of the input waveform 100 displayed when "XY" is displayed is selected with a marker, and "XY" is displayed based on the selected arbitrary portion of the input waveform. , It is possible to display a Lissajous waveform between arbitrary portions of the input waveform 100.

[0047]

As is apparent from the above description,
According to the present invention, the following effects can be obtained. According to the first aspect of the present invention, the divided screen other than the input waveform display section is divided along the vertical axis, and a plurality of enlarged waveforms of an arbitrary portion of the input waveform selected by the marker operation are displayed, so that the entire image is displayed. A waveform observing device capable of improving the display resolution of the display waveform in the vertical axis direction while grasping it can be realized.

According to the second aspect of the present invention, by displaying the enlarged position display means simultaneously when the enlarged waveform is displayed on the full screen, it is possible to grasp which portion of the input waveform the current enlarged portion corresponds to. A possible waveform observation device can be realized.

[0049]

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a waveform observation device according to the present invention.

FIG. 2 is an explanatory diagram showing a waveform display example on a display device.

FIG. 3 is an explanatory diagram showing a display example for solving a problem.

FIG. 4 is an explanatory diagram showing a conventional display example of a Lissajous waveform.

FIG. 5 is an explanatory diagram showing a conventional display example of a Lissajous waveform.

FIG. 6 is an explanatory diagram showing a display example of a Lissajous waveform that solves a problem.

FIG. 7 is an explanatory diagram showing a display example of a Lissajous waveform that solves a problem.

FIG. 8 is a configuration block diagram illustrating an example of a conventional waveform observation device.

FIG. 9 is an explanatory diagram showing a conventional waveform display example on a display device.

[Explanation of symbols]

 Reference Signs List 1 A / D converter 2 Waveform storage circuit 3, 6 Control circuit 4 Setting circuit 5 Display 100 Input waveform

Claims (2)

(57) [Claims] 1. A waveform observing device for storing a measured input waveform in a waveform storage circuit and displaying the input waveform on a display based on the stored data, comprising: an A / D converter for converting the input waveform into a digital signal; A waveform storage circuit for storing an output of the A / D converter; a display for displaying the input waveform based on an output of the waveform storage circuit; and a plurality of arbitrary portions of the input waveform on a screen of the display. Controlling a setting circuit to be selected, the A / D converter, the waveform storage circuit, the display, and the setting circuit, and dividing the display screen along the horizontal axis to display the input waveform on one of the divided screens. And a control circuit for displaying, on a screen obtained by further dividing the other divided screen along the vertical axis, an enlarged waveform of an arbitrary portion of the plurality of selected input waveforms. 2. The waveform observation apparatus according to claim 1, further comprising a control circuit for simultaneously displaying enlarged position display means when the enlarged waveform is displayed on a full screen.