JP2002073100A - Method and device for displaying waveform for waveform measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for displaying a waveform in a waveform measuring instrument by which a phenomenon having a very low frequency can precisely be analyzed. SOLUTION: A plurality of wave data are stored into a memory, and these plurality of wave data are selected, synthesized and then stored into a second memory. The wave data of the second memory are displayed on a display. Because only necessary wave data are selected and displayed, waveforms does not become hard to be seen by overlapped waveforms, and temporal responses of waveforms can clearly be grasped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for displaying a waveform of a waveform measuring instrument suitable for observing a waveform having a low frequency of occurrence.

[0002]

2. Description of the Related Art A waveform measuring instrument such as a digital oscilloscope has a function for capturing a phenomenon that occurs at a very low frequency. In order to realize such a function, an internal memory is divided to record a plurality of waveform data based on an input signal.

FIG. 3 shows the configuration of an apparatus for realizing such functions. In FIG. 3, a signal applied to an input terminal 4 is converted into a voltage signal suitable for each setting by an input unit 5,
The signal is converted into a digital signal by the converter 6. When the trigger signal is output from the trigger unit 10, the AD conversion unit 6 converts the voltage signal output from the input unit 5 into a digital signal for a predetermined time at a sampling period defined by the time base 11. .

[0004] The digital signal is processed by a data processing section 7 and stored in a memory 8. The memory 8 is divided into a plurality of areas, and can store a plurality of waveform data of input signals. The data processing control unit 12 controls the time base 11, the data processing unit 7, and the memory 8, and controls these operations.

[0005] A display unit 9 displays the waveform data stored in the memory 8. The display unit 9 includes a display control unit 91, a display data memory 92, a display 93, and an output unit 94. The display controller 91 reads the waveform data stored in the memory 8, performs an arithmetic process, and expands the waveform data in the display data memory 92. The waveform data developed in the display data memory 92 is displayed and output to an output unit 94 such as a display 93 and a printer.

FIG. 4 shows an example of a waveform displayed on the display 93. This waveform is obtained by synthesizing ten consecutive data out of a plurality of waveform data stored in the memory 8,
These are displayed in a superimposed manner. In this figure, a portion 13 surrounded by a circle is a phenomenon that appears only in the third and ninth waveforms. In this way, by superimposing and displaying, even a phenomenon having an extremely low frequency of occurrence can be clearly displayed.

[0007]

However, such a waveform display device has the following problems.

In the apparatus shown in FIG. 3, only one of the waveform data stored in the memory 8 or a waveform obtained by superimposing all the stored waveform data can be displayed. Therefore, when the waveform displayed on the display 93 is output to the output unit 94, the image displayed on the display 93 is output as it is. There was a problem that it was not possible.

When many waveforms are superimposed on each other, the quality of the waveform deteriorates, and it becomes difficult to see the detailed portion of the waveform. Therefore, there is a problem that it takes much time to analyze the waveform, and it is difficult to understand under what conditions the abnormal phenomenon occurs.

Furthermore, since many waveforms overlap each other, there is another problem that it is difficult to grasp the time course of the waveform.

Therefore, the problem to be solved by the present invention is:
It is an object of the present invention to provide a method and apparatus for displaying a waveform in a waveform measuring instrument capable of accurately analyzing even a phenomenon having a very low frequency of occurrence.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention stores a plurality of waveform data in a memory, reads out arbitrary waveform data from the stored waveform data, The read waveform data is used as it is or is synthesized and the waveform is displayed on a display. The temporal change of the waveform can be clearly grasped, and many waveforms do not overlap so that it is difficult to see.

According to a second aspect of the present invention, in the first aspect of the present invention, the waveform data stored in the memory is read out and displayed in the order of the stored time. The temporal change of the waveform can be clearly captured.

According to a third aspect of the present invention, in the first aspect of the present invention, the waveform data stored in the memory is read out and displayed in an arbitrary order. It is possible to examine in detail a portion where a phenomenon with a low occurrence frequency is likely to occur.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a plurality of arbitrary waveform data are read out of the waveform data stored in the memory, and these read out waveform data are combined and displayed. It is like that.
Since only necessary waveforms can be superimposed, it is not difficult to see the waveforms overlapping.

According to a fifth aspect of the present invention, a plurality of waveform data of an input signal is stored in a memory, and the waveform data stored in the memory is selected and stored in a second memory. Are displayed as they are or combined on the display unit. Since only necessary waveforms can be selected and displayed, the waveforms do not overlap and become difficult to see.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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. The same elements as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 1, 1 is a second memory,
Waveform data stored in the memory 8 is input. The waveform data stored in the second memory 1 is input to the display control unit 91. The second memory 1 is controlled by the data processing control unit 12.

Next, the operation of this embodiment will be described. Second
The memory 1 stores the waveform data to be displayed among the waveform data stored in the memory 8. For example,
Among the waveform data stored in the memory 8, waveform data at an arbitrary time and waveform data obtained by combining two or more waveform data are stored. The data processing control unit 12 performs processing such as waveform extraction and synthesis.

A specific example of the waveform data stored in the second memory 1 will be described with reference to FIG. The same elements as those in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted. In addition, it is assumed that ten pieces of waveform data are stored in the memory 8 in the order of acquisition time.

FIG. 2A shows an example in which ten waveforms are displayed in order. At this time, the data processing control unit 12 sequentially stores the waveform data stored in the memory 8 in the second memory 1 at predetermined time intervals. The display control unit 91 expands the waveform data stored in the second memory 1 in the display data memory 92 and displays the data on the display 93 or the output unit 9.
4 is output. In this way, as shown in FIG. 2A, the first to tenth waveforms are displayed in order, so that the waveforms can be observed as time elapses, and the third waveform can be observed. It can be observed that a very rare phenomenon 13 has occurred.

FIG. 2B shows an example in which the first, third and eighth waveforms are displayed in order. The display procedure is the same as that in FIG. By doing so, it is possible to concentrate on a portion where a rare phenomenon may have occurred. It is also useful for examining rough changes in waveform. In this embodiment, the waveform data is displayed in the order of the stored time. However, the display may be performed in the reverse order of the time or in any order.

FIG. 2C shows an example in which a plurality of waveforms are synthesized and displayed. The first, third and eighth waveforms are superimposed and synthesized, and displayed simultaneously. In this case, the data processing control unit 12 stores data obtained by combining three pieces of waveform data in the second memory 1. The display controller 91 displays and outputs the combined waveform data to the display 93 or the output unit 94. In this way, it is possible to observe at a glance the rare phenomenon or the lapse of time of the waveform. In addition, since a small amount of waveform data can be synthesized and displayed, detailed portions can be clearly observed.

[0023]

As is apparent from the above description,
According to the present invention, the following effects can be expected.

According to the first aspect of the present invention, a plurality of waveform data are stored in a memory, arbitrary waveform data is read out of the stored waveform data, and the read waveform data is directly or combined. The waveform is displayed on the display. This has the effect that the temporal change of the waveform can be clearly grasped, and that many waveforms do not overlap and become difficult to see.

According to the second aspect of the present invention, in the first aspect, the waveform data stored in the memory is
The data is read out and displayed in the order of the stored time.
There is an effect that a temporal change of a waveform or a phenomenon with a low frequency of occurrence can be clearly captured.

According to the third aspect of the present invention, in the first aspect of the present invention, the waveform data stored in the memory is
Read and display in any order. There is an effect that a portion where the probability of occurrence of a phenomenon of low occurrence frequency is high can be examined in detail.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a plurality of arbitrary waveform data are read out of the waveform data stored in the memory, and these read waveform data are combined and displayed. It is like that.
Since only necessary waveforms can be superimposed, there is an effect that the waveforms do not overlap and become difficult to see.

According to the fifth aspect of the present invention, the waveform data of the input signal is stored in a plurality of memories, the waveform data stored in the memory is selected and stored in the second memory,
The waveform data stored in the second memory is
Alternatively, they are combined and displayed on the display unit. Since only necessary waveforms can be selected and displayed, there is an advantage that the waveforms do not overlap and become difficult to see, and the elapse of time can be clearly grasped.

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating a specific example of waveform display.

FIG. 3 is a diagram showing a configuration of a waveform display device of a conventional waveform measuring instrument.

FIG. 4 is a diagram for explaining a conventional display example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 2nd memory 7 Data processing part 8 Memory 9 Display part 91 Display control part 92 Display data memory 93 Display 94 Output part 12 Data processing control part

Claims (5)

[Claims] A memory for storing waveform data of an input signal in a memory;
In a waveform measuring device that reads out this waveform data and displays it on a display, a plurality of waveform data is stored in the memory,
A waveform display method for a waveform measuring device, wherein arbitrary waveform data is read out of the stored waveform data, and the read waveform data is displayed as it is or on the display. 2. The method according to claim 1, wherein the waveform data stored in the memory is read out and displayed in the order of the stored time. 3. The waveform display method for a waveform measuring instrument according to claim 1, wherein the waveform data stored in the memory is read out and displayed in an arbitrary order. 4. A waveform display of a waveform measuring device, wherein a plurality of arbitrary waveform data are read out of waveform data stored in a memory, and these read out waveform data are combined and displayed. Method. 5. A memory for storing waveform data of an input signal, a second memory for selecting and storing the waveform data stored in the memory, and displaying the waveform data stored in the second memory. A display unit, wherein the memory stores a plurality of waveform data based on the input signal, and the second memory stores arbitrary waveform data among the plurality of waveform data stored in the memory. A waveform display device for a waveform measuring device, wherein these waveform data are displayed as they are or as synthesized.