JP3575019B2 - Digital oscilloscope and waveform display method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital oscilloscope for displaying a waveform and a waveform display method, and more particularly, to a digital oscilloscope and a waveform display method capable of easily searching for an abnormal waveform.
[0002]
[Prior art]
When troubleshooting a designed circuit using a digital oscilloscope, when supplementing an abnormal phenomenon, the trigger condition for supplementation is often unknown. In this case, a history memory is effective. For example, even if a trigger is applied under simple conditions such as an edge trigger, the signal is monitored on the screen, and the stop key is pressed when an abnormal phenomenon is displayed, the waveform is normally updated. It is difficult to do. However, in the case of a digital oscilloscope having a history memory, since the past waveform is unconditionally stored within a range permitted by the memory, an abnormal waveform can be called later.
[0003]
Such an apparatus is shown in FIG. 4 and described.
In the figure, a measuring unit 1 receives an input signal, performs A / D conversion, and converts the signal into digital data. The history memory 2 stores digital data of the measurement unit 1, that is, for example, 8000 times of waveform data. The setting unit 3 sets a waveform number and the like using, for example, a key. The display unit 4 reads out the waveform data from the history memory 2 by the setting unit 3 and displays the waveform data on the display unit 5, for example, a CRT or an LCD.
[0004]
The operation of such a device is described below.
FIG. 5 is a flowchart showing the operation of the apparatus shown in FIG.
In response to an instruction from the setting unit 3, the display unit 4 reads the waveform data with the waveform number “1” from the history memory 2. Then, the display means 4 displays the waveform of the waveform data on the display unit 5. The display means 4 waits for a display instruction of the next waveform data by the setting means 3. The display unit 4 adds “1” to the waveform number “1” in response to an instruction to display the next waveform data by the setting unit 3. The display unit 5 reads the waveform data with the waveform number “2” from the history memory 2 and displays the waveform on the display unit 4. Such an operation is repeated. Then, a waveform W in which the waveforms E1 and E2 of the abnormal phenomenon appear as shown in FIG. 6 is searched.
[0005]
[Problems to be solved by the invention]
In such a device, in order to search for the abnormal waveforms E1 and E2, it is necessary to check the waveform data stored in the history memory 2 one by one, and it takes time to search for the abnormal waveforms E1 and E2. There was a problem that it would.
[0006]
Therefore, an object of the present invention is to realize a digital oscilloscope and a waveform display method capable of easily searching for an abnormal waveform.
[0007]
[Means for Solving the Problems]
The present invention
In a digital oscilloscope that stores a plurality of measurement result waveform data in the storage unit and displays the waveform,
Area setting means for setting an abnormal area of the waveform data,
Determining means for determining whether or not each of the waveform data in the storage unit is within the abnormal region;
A display means for displaying the waveform data in a waveform when it is within the abnormal area according to the determination by the determination means, wherein the waveform data in the abnormal area is displayed in order.
[0008]
In the present invention, the area setting means sets an abnormal area of the waveform data. The determining means determines whether the waveform data in the storage unit is in the abnormal area. If the determination result indicates that the waveform data is within the abnormal area, the display means displays the waveform of the waveform data.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram showing one embodiment of the present invention. Here, the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.
[0010]
In the figure, a setting means 6 has at least an area setting means, for example, sets an abnormal area of waveform data using a key or the like. The determination means 7 determines whether the waveform data in the history memory (storage unit) 2 is within the abnormal area. The display unit 8 displays the abnormal region of the region setting unit 6 on the display unit 5, and displays the waveform data on the display unit 5 when the determination unit 7 determines that the abnormal region is within the abnormal region.
[0011]
The operation of such a device is described below.
FIG. 2 is a flowchart showing the operation of the apparatus shown in FIG. 1, and FIG. 3 is a view for explaining the abnormal area setting operation of the apparatus shown in FIG.
[0012]
As shown in FIG. 3, the display means 8 reads the waveform data from the history memory 2 and displays the waveform W and the abnormal waveforms E1 and E2 on the display unit 5. The method of searching for the abnormal waveforms E1 and E2 is the same as in the related art. The setting unit 6 sets the abnormal area A (S1), and the display unit 8 displays the abnormal area A surrounded by a square on the display unit 5. The determination means 7 reads the waveform data (S2), and determines whether or not there is waveform data in the abnormal area (S3).
[0013]
If there is waveform data in the abnormal area, the waveform data is passed to the display means 8. Then, the display unit 8 displays a waveform on the display unit 5. The determination means 7 waits for a display instruction of the next waveform data by the setting means 6 (S5). In accordance with an instruction from the setting means 6, "1" is added to the waveform number of the currently read waveform data, and the waveform data is read from the history memory 2 (S6, S2).
[0014]
If there is no waveform data in the abnormal region, "1" is added to the waveform number of the currently read waveform data, and the waveform data is read from the history memory 2 (S6, S2).
[0015]
Again, the determination means 7 determines whether the waveform data is within the abnormal area (S3). Such an operation is repeated.
[0016]
As described above, the setting of the abnormal area by the setting means 6 causes the judging means 7 to judge whether or not the waveform data of the history memory 2 is in the abnormal area and display the waveform by the display means 8. It is not necessary to look at the waveform data one by one. That is, an abnormal waveform can be efficiently found. In other words, for example, it is effective for analyzing at what timing an abnormal waveform appears with respect to a circuit read signal.
[0017]
Note that the present invention is not limited to this, and the display unit 8 and the display unit 5 are shown in different configurations. However, the display unit may be a single configuration.
[0018]
【The invention's effect】
According to the present invention, the following effects can be obtained.
According to the first aspect, the setting of the abnormal area by the area setting means causes the judging means to judge whether or not the waveform data in the storage section is within the abnormal area and display the waveform by the display means. There is no need to view the waveform data one by one. That is, an abnormal waveform can be efficiently found.
[0019]
According to the second aspect, by setting the abnormal area, it is determined whether the waveform data is within the abnormal area and the waveform is displayed. Therefore, it is not necessary to view the waveform data one by one. That is, an abnormal waveform can be efficiently found.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing one embodiment of the present invention.
FIG. 2 is a flowchart showing the operation of the apparatus shown in FIG.
FIG. 3 is a diagram illustrating an abnormal area setting operation of the apparatus shown in FIG.
FIG. 4 is a diagram showing a configuration of a conventional digital oscilloscope.
5 is a flowchart showing the operation of the device shown in FIG.
FIG. 6 is a diagram showing an example of an abnormal waveform.
[Explanation of symbols]
2 History memory 6 Setting means 7 Judgment means 8 Display means 9 Display unit

Claims (2)

In a digital oscilloscope that stores a plurality of measurement result waveform data in the storage unit and displays the waveform,
Area setting means for setting an abnormal area of the waveform data,
Determining means for determining whether or not each of the waveform data in the storage unit is within the abnormal region;
A digital oscilloscope comprising: display means for displaying a waveform of the waveform data when it is within the abnormal area according to the determination by the determination means, and sequentially displaying the waveform data in the abnormal area. In a waveform display method for displaying a plurality of waveform data of measurement results in a waveform,
Setting an abnormal region of the waveform data,
For each waveform data, determine whether it is within the abnormal area,
When in the abnormal region, display the waveform data,
A waveform display method characterized by sequentially displaying waveform data in the abnormal region.

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