JP3085479B2 - Waveform observation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform observation apparatus, and more particularly, to an improvement in a function of displaying a plurality of waveforms.

[0002]

2. Description of the Related Art With respect to signals output from the same object to be measured, the setting conditions on the waveform observation device side are changed, the setting conditions on the measurement object side are changed, and the setting conditions on the waveform observation device side are changed. There is a case where it is desired to record display waveforms in various combinations of the setting conditions on the measurement target side and to compare the plurality of recorded waveforms at the same time to observe the state of signal change.

Therefore, conventionally, the display screen of the waveform observation device is recorded in a photograph for each measurement, or the display screen is printed out, and a plurality of hard copies are arranged and analyzed.

[0004]

However, according to such a conventional method, the display information of the signal output from the object to be measured when the display screen is hard-copied is fixed. Even if an attempt is made to observe an enlarged portion of interest on a hard copy and observe it in detail, the resolution is limited by the hard copy, and thus the degree of freedom is lacking.

Further, a hard copy must be taken every time the waveform is observed, and the response is poor. The present invention has been made in view of such a problem, and an object of the present invention is to be able to quickly acquire a plurality of waveforms related to a signal output from the same measurement target and simultaneously compare and observe the waveforms. It is an object of the present invention to realize a waveform observing device capable of observing an arbitrary waveform in detail.

[0006]

Means for Solving the Problems The present invention to solve such a problem, an A / D converter for converting the measured waveform signal into a digital signal, which is output from the A / D converter
Re includes a waveform memory having a capacity of at least 2 waveform component storing digital data of different measurement waveform signal, the waveform display unit that divides displaying at least two waveform read out digital data of different measurement waveform signal from the waveform memory, the It is characterized by having.

[0007]

In the waveform memory, digital data of a plurality of different waveforms relating to signals output from the same object to be measured are stored. Then, at least two of the digital data of a plurality of different waveforms are read out to the waveform display unit and divided and displayed. Then, a part of the display waveform can be selectively enlarged based on the digital data stored in the waveform memory.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of the present invention. In the figure, reference numeral 1 denotes an input terminal of a measured waveform signal, which is connected to an A / D converter 2 for converting the signal into a digital signal. Reference numeral 3 denotes a waveform memory, which has a capacity to store digital data of different measurement waveform signals output from the A / D converter 2 for at least two waveforms (n waveforms in this embodiment). Reference numeral 4 denotes a display circuit, and a waveform memory 2
, The digital data of the different measured waveform signals are read out, and at least two waveforms are controlled so as to be divided and displayed on the monitor 5. The display circuit 4 and the monitor 5 form a waveform display section.

FIG. 2 shows an example of a plurality of waveforms stored in the waveform memory 3. These relate to signals output from the same measurement target, and include the voltage range,
It responds to changes in the setting of measurement conditions such as the time axis and on / off of the filter, and changes in the conditions of the measured waveform signal itself.

FIG. 3 is a display example of a monitor. Display circuit 4
Reads out digital data of a plurality of waveforms stored in the waveform memory 3 in a combination based on, for example, measurement conditions, and compresses the read out waveforms into one frame obtained by dividing the screen of the monitor 5 into nine frames as shown in FIG. For example, the information is displayed in an array according to the order of change of the measurement conditions. Thus, for example, a change in the waveform with respect to a change in the measurement condition becomes obvious.

FIG. 4 is an enlarged display example of a part of the waveform in FIG. 3, and shows an example in which the waveform 2 is enlarged and displayed. That is,
Although the noticed part becomes unclear in the compressed display waveform, details can be observed by enlarging the corresponding waveform on the entire display screen as shown in FIG. 4 based on the digital data stored in the waveform memory 3 as necessary. it can.

The divided display on the monitor 5 is not limited to that shown in FIG. 3, but may take various forms. FIG. 5 shows another example of the divided display, in which a plurality of waveforms are shifted and displayed so that the cards are shifted and arranged. These divided displays can be realized by configuring the display circuit 4 with a microprocessor. When displaying in the card format as shown in FIG. 5, it is also possible to turn over the stacked cards one by one and display them as a moving image.

[0013] Further, by keeping the measurement conditions of the waveform observing device constant, the waveform data of the same signal over time is stored, and a plurality of these waveforms are superimposed and displayed in a transparent manner, so that the waveform of the waveform over time is displayed. Changes can also be displayed three-dimensionally.

Although the present invention requires a considerable amount of memory, semiconductor memories have recently become inexpensive and can be realized at relatively low cost.

[0015]

As described in detail above, according to the present invention, the following effects can be obtained. On the same screen of the monitor, change the setting of measurement conditions for the same signal or perform the same measurement
Changes in the same signal over time due to conditions
Re plurality of observed waveforms of the same signals under different conditions can be displayed, rapid response to the measurement target circuit characterization of such, troubleshooting, and the like.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is an example of a plurality of waveforms stored in a waveform memory of FIG. 1;

FIG. 3 is a display example of the monitor of FIG. 1;

FIG. 4 is an enlarged display example of a part of the waveform in FIG. 3;

FIG. 5 is another example of divided display.

[Explanation of symbols]

 1 input terminal 2 A / D converter 3 waveform memory 4 display circuit 5 monitor

Claims (1)

(57) [Claims] 1. An A / D converter for converting a measured waveform signal into a digital signal, and a waveform having a capacity for storing at least two digital data of different measured waveform signals output from the A / D converter. A waveform observation apparatus, comprising: a memory; and a waveform display unit that reads digital data of different measurement waveform signals from the waveform memory and divides and displays at least two waveforms.