JP2000338138A - Waveform display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveform display device allowing an easy comparison between a signal waveform based on a waveform recorded before and a signal waveform of an input signal newly inputted. SOLUTION: This device is provided with a waveform memory storing signal waveform data converted from an input signal, and a display part 3 displaying a signal waveform of the input signal, and is constituted such that a display screen 11 of the display part 3 is divided to display multiple divided display screens 12, 13, and signal waveforms W1, W2 are displayed in the individual divided display screens 12, 13. Signal waveform data corresponding to an arbitrary waveform part W1 of the input signal is read out from the waveform memory, and the arbitrary waveform part W1 is displayed on one divided display screen 12, and a signal waveform W2 of a newly inputted input signal is displayed on another divided display screen 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform display device for displaying a signal waveform based on signal waveform data obtained by converting an input signal into data.

[0002]

2. Description of the Related Art As this kind of waveform display device, a waveform recording device 31 shown in FIG. 5 is conventionally known. The waveform recording device 31 is configured to be capable of recording waveform data D obtained by converting the input signal S into data, displaying a signal waveform based on the waveform data D, and the like. Specifically, the waveform recording device 31 includes a measurement unit 2 that generates waveform data D corresponding to the signal waveform of the input signal S, a display unit 3 that displays a signal waveform based on the waveform data D, and keys 21a to 21a. An operation unit 4 having a function key unit 21 (see FIG. 7) composed of an operation unit 21e and a floppy disk drive for recording waveform data D on a floppy disk (hereinafter referred to as “FD”) and for reading from the FD (Hereafter, "F
DD), a control unit 36 for executing measurement control of the measurement unit 2 and display control of the display unit 3, a RAM 37 for temporarily storing the waveform data D, and an operation program of the control unit 36. And a ROM 38 for performing the operation.

The waveform recording device 31 has a so-called trigger function. When the trigger function is executed, the recording and display of the waveform data D is performed when the level of the input signal S input to the measuring section 2 is a predetermined voltage. The process is started at a point outside the range or a point at which a predetermined set value is crossed upward (+ direction) or downward (-direction). For example, when recording and displaying by the trigger function when the input signal S2 shown in FIG. 6B is out of the voltage range of, for example, ± 0.1 V, first, a predetermined key of the operation unit 4 is operated. As a result, the waveform display screen 41 shown in FIG. In this state, the control unit 36 determines that the voltage value of the input signal S2 is ± 0.1 V
At the time t1 outside the voltage range, the storage of the waveform data D2 output from the measurement unit 2 in the RAM 37 is started, and the signal waveform W2 based on the waveform data D2 is displayed as shown in FIG. It is displayed on the unit 3 sequentially.

The waveform recording device 31 can also enlarge and display an arbitrary waveform portion of a signal waveform based on the waveform data D already recorded on an FD or the like. For example, when enlarging and displaying a predetermined portion of the signal waveform W1 for the input signal S1 shown in FIG. 6A, the user first operates the key 21e of the function key section 21 to display the display range designation shown in FIG. The screen 42 is displayed on the display unit 3. in this case,
The display range designation screen 42 is divided into two parts, and the upper divided display screen displays an entire display screen 43 that displays the entire signal waveform so that an arbitrary waveform part of the signal waveform based on the waveform data D can be designated. On the lower display screen, there is displayed an enlarged display screen 44 for enlarging and displaying, in the time axis direction, the waveform portion whose range is specified on the entire display screen 43. Further, on the display range specifying screen 42, cursor displays 45a and 45b for specifying the range of the waveform part to be enlarged and displayed on the entire display screen 43 are displayed. At this point, no signal waveform is displayed on both display screens 43 and 44.

Next, the FD on which the waveform data D1 is recorded is inserted into the FDD 5, and a predetermined key is operated. At this time, the control unit 36 reads the waveform data D1 from the FD, stores the read waveform data D1 in the RAM 37, and converts the entire signal waveform W1 based on the waveform data D1 as shown in FIG. It is displayed on the entire display screen 43. Next, the key 21a of the function key section 21 is operated. In this state, the start point of range designation can be set by the cursor display 45a, and the keys 21c and 21d are set.
Is operated to move the cursor display 45a to an arbitrary part. Similarly, by operating the key 21b and operating the keys 21c and 21d, the cursor display 45 is displayed.
b is moved to the end point of the range specification. Thereby, as shown in FIG.
The signal waveform W1 whose range is designated by a and 45b is enlarged and displayed in the time axis direction. Thereafter, when the key 21e is operated, as shown in FIG. 9, a waveform display screen 41 is displayed on the display unit 3, and the signal waveform W1 whose range is specified on the display range specifying screen 42 is displayed on the waveform display screen 41. You.

[0006]

However, the conventional waveform recording device 31 has the following problems. That is, the conventional waveform recording device 31 can display the signal waveform W2 based on the newly input signal S2 and the signal waveform W1 based on the previously recorded waveform data D1 on the waveform display screen 41. However, for example, the signal waveform W1 based on the waveform data D1 recorded in the past and the signal waveform W2 of the newly input signal S2 cannot be simultaneously displayed on the display unit 3. Therefore, both signal waveforms W1,
As a result of the comparison of W2 becoming difficult, for example, a normal signal waveform W1 is recorded in advance, and the signal waveform W1 is compared with a newly input signal waveform W2, so that the signal waveform W2 becomes abnormal. There is a problem that it is difficult to find out whether or not a portion has occurred.

The present invention has been made in view of such a problem, and it is possible to easily compare a signal waveform based on previously recorded waveform data with a signal waveform of a newly input signal. A main object is to provide a waveform display device.

[0008]

According to a first aspect of the present invention, there is provided a waveform display device for storing a signal waveform data obtained by converting an input signal into data, and a display for displaying a signal waveform of the input signal. And a display unit configured to divide the display screen of the display unit to display a plurality of divided display screens and display a signal waveform for each divided display screen. , The arbitrary waveform portion is displayed on one divided display screen, and the signal waveform of the newly input signal can be displayed on another divided display screen. It is characterized by.

According to the second aspect of the present invention, there is provided a waveform display apparatus.
The described waveform display device is characterized in that a signal waveform displayed on one divided display screen and a signal waveform displayed on another divided display screen are displayed in synchronization with respective arbitrary waveform portions.

A third aspect of the present invention is a waveform display device.
Or the one divided display screen in a state where the signal waveform displayed on one divided display screen and the signal waveform displayed on another divided display screen are synchronized with respective arbitrary waveform parts. And superimposed on one of the other divided display screens.

A fourth aspect of the present invention is a waveform display device.
3. The waveform display device according to any one of items 1 to 3, wherein both signal waveforms are scroll-displayed in synchronization with each other.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention in which a waveform display device according to the present invention is applied to a waveform recording device will be described below with reference to the accompanying drawings. Note that the same components as those of the conventional waveform recording device 31 are denoted by the same reference numerals, and redundant description will be omitted.

First, an electrical configuration of the waveform recording apparatus 1 according to the embodiment of the present invention will be described with reference to a block diagram of FIG.

As shown in FIG. 1, the waveform recording apparatus 1 includes a measuring unit 2, a display unit 3, an operation unit 4, an FDD 5, a control unit 6,
It comprises an AM 7 and a ROM 8. The measurement section 2 converts the input signal S from analog to digital to generate waveform data D, and outputs the waveform data D to the control section 6. The display unit 3 includes an LCD panel or a cathode ray tube (CRT), and displays a signal waveform and the like based on the waveform data D under the control of the control unit 6. Various keys are assigned to the operation unit 4 such as a function key unit 21 including keys 21 a to 21 e on which various functions are assigned according to a use situation and function displays indicating the assigned functions are displayed on the display unit 3. ing. The FDD 5 performs recording of the waveform data D on the FD and reading of the waveform data D recorded on the FD. The control unit 6 controls the storage of the input waveform data D in the RAM 7, the display control of the signal waveform based on the waveform data D on the display unit 3, and
The control of recording the waveform data D to the FD for the FDD 5 and the control of reading the waveform data D are performed. RAM7
Corresponds to a waveform memory in the present invention, and is configured to be capable of independently storing waveform data D respectively corresponding to a plurality of signal waveforms. The ROM 8 stores an operation program of the control unit 6 and the like.

Next, the overall operation of the waveform recording device 1 will be described. In the following description, FIG.
The waveform data D1 for the input signal S1 shown in FIG.
2 is used as the waveform data of the input signal S to be newly input, and the time when the recording of both the input signals S1 and S2 is started by the trigger measurement is referred to as time t1 shown in FIG. The same functions as those of the waveform recording device 31 will not be described again, and the signal waveform W based on the waveform data D1 and D2 will be described below.
The simultaneous display method of 1 and W2 will be described with reference to the drawings.

First, a predetermined key of the operation unit 4 is operated to display the waveform display screen 11 shown in FIG. In this case, the waveform display screen 11 includes a first display screen 12 corresponding to one split display screen in the present invention and displaying a signal waveform W1 based on the past waveform data D1, and another split display screen in the present invention. Input signal S corresponding to newly input
And a second display screen 13 displaying a signal waveform W2 based on the waveform data D2 for the second data. Further, the waveform display screen 11 includes a cursor display 14 for designating a predetermined portion of the signal waveform displayed on the first display screen 12 or the second display screen 13, and a waveform display for the waveform portion designated by the cursor display 14. A cursor reading display 15 displaying the elapsed time from the start of recording and its amplitude value, and a selection screen display 16 showing a display screen to which the cursor reading display function is selectively allocated are displayed.

Next, a predetermined key of the operation unit 4 is operated to
The time axis range on both display screens 12 and 13 is set. In this case, the time axis full scale is set to, for example, 5 seconds. Next, the FD on which the waveform data D1 is recorded is
After insertion into the DD 5, a predetermined key of the operation unit 4 is operated.
Thus, the waveform data D1 is read by the FDD 5. At this time, the control unit 6 stores the read waveform data D1 in a predetermined storage area of the RAM 7 and, at the left end of the first display screen 12, displays a signal waveform based on the waveform data D1 as shown in FIG. The top waveform portion at W1 (the waveform portion whose recording was started at time t1 in FIG. 6) is displayed, and the waveform portion corresponding to the recording time of 5 seconds is displayed.

Next, when a new input signal S2 is input, the measuring section 2 uses the trigger measurement function to input the input signal S2.
Is generated. Next, the control unit 6 stores the waveform data D2 in a predetermined storage area of the RAM 7, and displays the signal waveform at the time t1 in FIG. 6 on the left end of the second display screen 13 as shown in FIG. The signal waveform W2 based on the waveform data D2 is displayed on the second display screen 13 sequentially. On the other hand, as shown in FIG. 3, when the signal waveform W2 is displayed to the right end of the second display screen 13, the control unit 6 controls the signal waveforms W1 and W1 displayed on the both display screens 12 and 13, respectively.
The signal waveform corresponding to, for example, one second in W2 is synchronously scroll-displayed toward the left side of the display screen. Thereafter, as shown in FIG. 4, the control unit 6 performs both the signal waveforms W1 and W2 while performing scroll display according to the lapse of the recording time.
Are displayed on both display screens 12 and 13, respectively.

In this case, the operator operates the first display screen 1
By comparing the signal waveforms W1 and W2 displayed on the second and second display screens 13 respectively, the difference can be easily identified. For example, 0 of the signal waveform W2
It can be easily determined that the time until the convergence to V is delayed by several seconds as compared with the signal waveform W1. As described above, according to the waveform recording device 1, the signal waveform W1 based on the waveform data D1 recorded in the past and the signal waveform W2 based on the waveform data D2 of the newly input signal S2 are displayed in a waveform. By displaying the signals on the first display screen 12 and the second display screen 13, which are divided and displayed on the upper and lower sides of the screen 11, the two signal waveforms W1 and W2 can be easily compared. Also, by synchronizing and scrolling the two signal waveforms W1 and W2, even if the signal waveform has a long recording time for one time, the difference between the two signal waveforms W1 and W2 is displayed to the operator. It can be very easily identified.

Further, in the waveform recording apparatus 1, both signal waveforms W1 and W2 can be displayed in synchronization with an arbitrary waveform portion. For example, the time t of the signal waveform W1 shown in FIG.
In order to display the waveform portion at 1 and the waveform portion at time t2 of the signal waveform W2 in synchronization with each other, first, a predetermined key of the operation unit 4 is operated to cancel the synchronous display on both display screens 12 and 13. . Next, the signal waveform W1 is displayed on the first display screen 12, and the signal waveform W1 is appropriately moved using a jog dial or the like. Next, the signal waveform W2 of the newly input signal S2 is sequentially displayed on the second display screen 13. In this state, when the signal waveform W2 is displayed up to the right end of the second display screen 13, only the signal waveform W2 is scroll-displayed toward the left side of the display screen. At this time,
The key 21a is operated when the waveform portions to be synchronized in both the signal waveforms W1 and W2 are arranged in the vertical direction of the waveform display screen 11. Thereby, both signal waveforms W1 and W2 are thereafter displayed in synchronization. In this case, the scroll display is performed in the same manner as the display processing described above. As a result, both signal waveforms W1 and W2 displayed on both display screens 12 and 13 can be displayed in synchronization with an arbitrary waveform portion, so that, for example, in the trigger measurement, the first waveform portion was recorded with a slight time lag. Even in such a case, waveform portions to be compared can be reliably compared.

Further, in the waveform recording apparatus 1, after recording new waveform data D2 of the input signal S2, as shown in FIG. 3, both signal waveforms W1 and W2 are synchronized with respective arbitrary waveform portions. In this state, the two signal waveforms W1 and W2 are superimposed on one of the first display screen 12 and the second display screen 13 by operating predetermined keys on the first display screen 12 and the second display screen 13, respectively. Can also be displayed. In this case, both signal waveforms W1, W
2 is very easy to identify the differences. Also in this case, both the signal waveforms W1 and W2 can be scroll-displayed in synchronization with each other, and the two signal waveforms W1 and W1 having relative ratios can be displayed.
Even if the recording time of W2 is long, it is of course possible for the operator to identify the difference between the two signal waveforms W1 and W2 reliably and extremely easily.

The present invention is not limited to the above embodiment. For example, in the embodiment of the present invention, an example has been described in which the signal waveforms W1 and W2 are displayed on the first display screen 12 and the second display screen 13 obtained by dividing the waveform display screen 11 into upper and lower parts, respectively. The display screen is not limited to this, and the waveform display screen may be divided in the left-right direction, or may be divided into three or more, and different signal waveforms may be displayed on the respective divided display screens.

[0023]

As described above, according to the waveform display device of the first aspect, an arbitrary waveform portion of an already recorded input signal is displayed on one divided display screen, and a newly input signal is displayed. By displaying the signal waveform on another divided display screen, both signal waveforms can be easily compared. Thus, the operator can easily identify the difference between the two signal waveforms, and thus can easily find, for example, an abnormal portion of the newly input signal waveform.

According to the second aspect of the present invention, the signal waveform displayed on one divided display screen and the signal waveform displayed on another divided display screen are synchronized with respective arbitrary waveform portions. The waveform portions to be compared can be reliably and easily compared with each other.

Furthermore, according to the third aspect of the present invention, the signal waveform displayed on one divided display screen and the signal waveform displayed on another divided display screen are synchronized with respective arbitrary waveform portions. By superimposing and displaying on one of the divided display screens and the other divided display screens in this state, it is possible to extremely easily compare waveform portions to be compared with each other.

According to the fourth aspect of the present invention, both the signal waveforms are scroll-displayed in synchronization with each other, so that even if the recording time of the relative signal waveforms is long, the operator can perform the operation. In contrast, the difference between the two signal waveforms can be surely and extremely easily identified.

[Brief description of the drawings]

FIG. 1 is a view of a display screen of a display unit 3 when a signal waveform W1 based on waveform data D1 is displayed on a first display screen 12 of a waveform display screen 11.

FIG. 2 shows a signal waveform W2 based on waveform data D2 for an input signal S2 on a second display screen 13 of the waveform display screen 11.
FIG. 6 is a display screen diagram of the display unit 3 when the images are sequentially displayed.

FIG. 3 is a display screen diagram of the display unit 3 when a signal waveform W2 is displayed up to the right end of a second display screen 13.

FIG. 4 is a view of the display screen of the display unit 3 when the signal waveforms W1 and W2 of the waveform display screen 11 are scroll-displayed.

FIG. 5 is a block diagram showing an electrical configuration of the waveform recording device 1 according to the embodiment of the present invention and a conventional waveform recording device 31.

FIG. 6A is a signal waveform diagram illustrating an example of an input signal S1 which is a basis of waveform data D1 recorded in the past, and FIG. 6B is a signal waveform diagram illustrating an example of a newly input input signal S2. is there.

FIG. 7 is a display screen diagram of the display unit 3 when a signal waveform W2 is displayed on the waveform display screen 41.

FIG. 8 is a display screen diagram of the display unit 3 when a predetermined waveform portion of the signal waveform W1 is designated on the display range designation screen 42;

FIG. 9 is a waveform display screen 4 showing a signal waveform W1 whose range is specified.
FIG. 4 is a display screen diagram of the display unit 3 when the display unit 1 is displayed.

[Explanation of symbols]

 Reference Signs List 1 waveform recording device 3 display unit 7 RAM 11 waveform display screen 12 first display screen 13 second display screen D, D1, D2 waveform data S, S1, S2 input signal W1, W2 signal waveform

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Masuda 81, Sakuracho, Koizumi, Ueda-shi, Nagano Prefecture Inside (72) Inventor Fumihiko Toho 81, Sakuracho, Koizumi, Oaza, Ueda-shi, Nagano Hioki Electric Co., Ltd. Inside

Claims (4)

[Claims] 1. A display device comprising: a waveform memory for storing signal waveform data obtained by converting an input signal into data; and a display unit for displaying a signal waveform of the input signal. A waveform display device configured to display a screen and display the signal waveform for each of the divided display screens, wherein the signal waveform data corresponding to an arbitrary waveform portion of the input signal is read from the waveform memory, and A waveform display device, wherein an arbitrary waveform portion is displayed on one of the divided display screens, and a signal waveform of a newly input input signal can be displayed on another of the divided display screens. 2. The method according to claim 1, wherein the signal waveform displayed on the first divided display screen and the signal waveform displayed on the other divided display screen are displayed in synchronization with respective arbitrary waveform portions. The waveform display device according to claim 1. 3. The signal waveform displayed on the one divided display screen and the signal waveform displayed on the another divided display screen are synchronized with each arbitrary waveform part in the first divided display screen.
2. The display is superimposed on one of the divided display screen and the other divided display screen.
Or the waveform display device according to 2. 4. The waveform display device according to claim 1, wherein the two signal waveforms are scroll-displayed in synchronization with each other.