JP4517757B2 - Waveform measuring device - Google Patents

Description

  The present invention displays one of the desired two channels of waveform data as X-axis data and the other waveform data as Y-axis data among the waveform data measured by the measurement units assigned to each of the plurality of input channels. More particularly, the present invention relates to a waveform measuring apparatus that can easily analyze an XY waveform.

  A waveform measurement device (for example, a digital oscilloscope or a paperless recorder) measures a waveform to be measured, converts it into waveform data of a digital signal, and stores it in a waveform memory. The waveform data stored in the waveform memory is analyzed, and the analysis results and waveform data are displayed on the display screen of the display unit via the display processing unit. Widely used in development, quality control, maintenance work, etc. (see, for example, Patent Document 1 and Patent Document 2).

  FIG. 7 is a diagram showing a configuration of a conventional waveform measuring apparatus. In FIG. 7, a measured waveform is input to input channels CH1 to CH4. The measurement unit 1 is provided in each of the input channels CH1 to CH4, receives a waveform to be measured from the input channels CH1 to CH4, and outputs waveform data. The measured waveform input to the apparatus is called an input waveform.

  The waveform memory 2 is a waveform data storage unit and stores waveform data output from the measurement unit 1. The operation control unit 3 receives an operation performed on the apparatus by the user and outputs operation contents (measurement conditions, display conditions, etc.). Note that the user operates, for example, a panel key and a rotary knob provided on the front surface of the apparatus, a mouse and a keyboard connected to the apparatus, and the like.

  A ROM (Read Only Memory) 4 stores a program for operating the apparatus. A RAM (Random Access Memory) 5 temporarily stores various data such as waveform data and operation contents. The display unit 6 performs waveform display of waveform data, display of analysis results of waveform data, and the like.

  The trigger detection unit 7 detects the timing at which the waveform data is stored in the waveform memory 2 based on the waveform data from the measurement unit 1, and outputs a trigger signal to the waveform memory 2. A CPU (Central Processing Unit) 8 is connected to the ROM 4 and the RAM 5, reads a program in the ROM 4, and controls the entire apparatus according to the program. Further, according to the operation contents of the operation control unit 3, trigger conditions are set in the trigger detection unit 7, waveform data is read from the waveform memory 2, and waveform display and analysis result display are performed on the display screen of the display unit 6.

The operation of such an apparatus will be described.
Each of the measurement units 1 converts the input waveforms of the input channels CH1 to CH4 into digital signals by an AD converter provided in the measurement unit 1, and outputs the digital signals to the waveform memory 2 as waveform data. In addition, when the trigger detection unit 7 detects an input waveform that becomes a preset trigger condition, it outputs a trigger signal to the waveform memory 2. According to this trigger signal, the waveform memory 2 stores desired waveform data.

  Then, the CPU 8 reads the waveform data in the waveform memory 2 in accordance with the operation content from the operation control unit 3, temporarily stores the waveform data and the operation content in the RAM 5, performs data processing, and via a display processing unit (not shown). The result of waveform display or waveform analysis is displayed on the display screen of the display unit 6.

  The waveform display method is such that the waveform is displayed on the t-Y coordinate (t− Some of them are called Y waveforms.

  Further, separately from the t-Y waveform, one of the waveform data of the desired two channels (for example, channel CH1 and channel CH2) (for example, the voltage value of channel CH1) is taken as the X-axis data, and the other waveform data (for example, Some display the waveform (referred to as an XY waveform) on the XY coordinates using the voltage value of the channel CH2 as the Y-axis data. Such an XY waveform display is very useful for a material strength test, an automobile engine characteristic test, and the like. For example, in the material test, by gradually applying a force in the direction of stretching a material such as iron or steel, the applied force is taken as the X axis, and the elongation of the material at that time is taken as the Y axis. Can be displayed. In the engine characteristic test of an automobile, the characteristics of the engine can be easily analyzed by setting the piston movement to the X axis and the cylinder internal pressure to the Y axis.

Next, trigger conditions set in the trigger detection unit 7 will be described. Here, FIG. 8 and FIG. 9 are diagrams showing examples of trigger conditions.
The trigger condition is input by the user from the operation control unit 3 and set in the trigger detection unit 7 via the CPU 8. The trigger condition is set for each necessary input channel CH1 to CH4 on the t-Y coordinate.

  The trigger condition is set at the voltage level for each of the input channels CH1 to CH4. For example, as shown in FIG. 8A, if the trigger condition is that the voltage value of the input channel CH1 exceeds a predetermined trigger level V1, the trigger is established when the trigger condition is satisfied, and the trigger detector 7 triggers. Output a signal.

  Further, as shown in FIG. 8B, a trigger condition (channel CH1 voltage level V1 and channel CH2 voltage level V2) is set for each channel, and a plurality of trigger conditions are combined by AND or OR. The trigger may be established under the combined trigger condition, and the trigger detection unit 7 may output a trigger signal.

  Furthermore, a trigger condition in which the trigger detection unit 7 outputs a trigger signal when the input waveform exceeds the trigger level V1 is referred to as an edge trigger (see FIG. 9A). On the other hand, an upper limit trigger level VH and a lower limit trigger level VL may be determined, and when an input waveform enters (or exits) within this region, the trigger detection unit 7 may output a trigger signal as a trigger establishment. The trigger condition by such an area is called a window trigger (see FIG. 9B).

JP-A-11-118532 (paragraph numbers 0002-0022, FIG. 4-6) JP-A-5-142259 (paragraph numbers 0002-0003, FIG. 3)

  Since the trigger is set under various conditions as described above, a desired input waveform can be easily measured and displayed. The correlation between two input waveforms can be analyzed by displaying the XY waveform and tracing it on the display screen.

  However, the trigger condition is set for each of the channels CH1 to CH4 on the tY coordinate on which the tY waveform is displayed, and is set for the fluctuation of the voltage value. Therefore, in the XY waveform display, it is difficult to determine whether or not the XY waveform has entered (or has come out) at the desired trace position, and the XY waveform that satisfies the desired conditions is analyzed. There was a problem that was difficult.

  Accordingly, an object of the present invention is to realize a waveform measuring apparatus capable of easily analyzing an XY waveform.

The invention described in claim 1
Of the waveform data measured by the measurement unit assigned to each of the plurality of input channels, one of the desired two-channel waveform data is set as X-axis data, and the other waveform data is set as Y-axis data. In the waveform measuring apparatus for displaying the XY waveform in
A closed region generating unit that generates a closed region on a display screen on which the XY waveform is displayed;
A determination unit for determining whether or not an XY waveform is included in the closed region generated by the closed region generation unit ;
The determination unit
A conversion unit that converts the closed region on the XY coordinate generated by the closed region generation unit into a region on the tY coordinate using the X-axis data as time and the Y-axis data as the waveform data;
A trigger detection unit that generates a trigger signal using the region converted by the conversion unit as a trigger condition;
It is characterized by having .
The invention according to claim 2
Of the waveform data measured by the measurement unit assigned to each of the plurality of input channels, one of the desired two-channel waveform data is set as X-axis data, and the other waveform data is set as Y-axis data. In the waveform measuring apparatus for displaying the XY waveform in
A closed region generating unit that generates a closed region with four cursors including two cursors on the X axis and two cursors on the Y axis on the display screen on which the XY waveform is displayed;
A determination unit that determines whether each of the X-axis data and the waveform data of the Y-axis data displayed as an XY waveform is contained in the closed region on the XY coordinate generated by the closed region generation unit. When,
A waveform data storage unit for storing a plurality of sets of waveform data for displaying XY waveforms;
Provided,
The determination unit
A conversion unit that converts the closed region on the XY coordinate generated by the closed region generation unit into a region on the tY coordinate using X-axis data as time and Y-axis data as the waveform data;
A search unit for searching for a desired set of waveform data from the waveform data storage unit using the converted area of the conversion unit as a search condition;
It is characterized by having .
The invention described in claim 3
Of the waveform data measured by the measurement units assigned to each of the plurality of input channels, one of the desired two-channel waveform data is set as X-axis data, and the other waveform data is set as Y-axis data. In the waveform measuring apparatus for displaying the XY waveform in
On the display screen on which the XY waveform is displayed, a closed region generating unit that generates a closed region with four cursors including two cursors on the X axis and two cursors on the Y axis;
A determination unit that determines whether each of the X-axis data and the waveform data of the Y-axis data displayed as an XY waveform is contained in the closed region on the XY coordinate generated by the closed region generation unit. When
Provided,
The determination unit
A conversion unit that converts the closed region on the XY coordinate generated by the closed region generation unit into a region on the tY coordinate using X-axis data as time and Y-axis data as the waveform data;
Using the converted area of this conversion unit as a condition for waveform determination,
It is characterized by having .

The invention according to claim 4 is the invention according to any one of claims 1 to 3 ,
The closed region generation unit sets a plurality of closed regions.

The present invention has the following effects.
According to the first to fourth aspects, the closed region generation unit sets the closed region as the trace position of the XY waveform in the region where the XY waveform is displayed, and the determination unit closes the XY waveform. Determine if you are in an area. That is, the user can visually set the closed region while viewing the XY waveform indicating the correlation between the two input waveforms. Thereby, it can be easily determined whether or not the XY waveform is in the desired closed region, and the XY waveform can be easily analyzed.

According to claim 1, closed area generation unit, in the region where X-Y waveform is displayed, to set the closed area of the trigger condition as a trace position of the X-Y waveform, converting part of the X-Y coordinate The trigger condition is converted into a trigger condition on the t-Y coordinate. That is, the user can set the trigger condition while viewing the XY waveform indicating the correlation between the two input waveforms, and can visually set the closed region. Thereby, the XY waveform which becomes a desired condition can be measured. Therefore, the XY waveform can be easily analyzed.

According to claim 2 , the closed region generation unit sets the closed region of the search condition as the trace position of the XY waveform in the region where the XY waveform is displayed, and the conversion unit is on the XY coordinate. The search condition is converted into a search condition on the t-Y coordinate. That is, the user can set the search condition while viewing the XY waveform indicating the correlation between the two input waveforms, and can visually set the closed region. As a result, a set of waveform data serving as a desired search condition can be easily searched from the waveform data storage unit. Therefore, the XY waveform can be easily analyzed.

According to claim 3 , the closed region generation unit sets the closed region of the determination condition as the trace position of the XY waveform in the region where the XY waveform is displayed, and the conversion unit is on the XY coordinate. The determination condition is converted into a determination condition on the t-Y coordinate. That is, the user can set the determination condition while viewing the XY waveform indicating the correlation between the two input waveforms, and can visually set the closed region. Thereby, it can be easily determined whether the XY waveform is an abnormal waveform or a normal waveform under a desired determination condition. Therefore, the XY waveform can be easily analyzed.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing an embodiment of the present invention. Here, the same components as those in FIG. In FIG. 1, a closed region generation unit 9 and a conversion unit 10 are newly provided. A trigger detection unit 11 is provided instead of the trigger detection unit 7.

  The closed region generation unit 9 is connected to the CPU 8 and generates and displays a closed region on the display screen of the display unit 6 on which the XY waveform is displayed. The conversion unit 10 converts the closed region on the XY coordinate generated by the closed region generation unit 9 into a region (for example, window) on the tY coordinate, and outputs the converted region to the trigger detection unit 11. The trigger detection unit 11 uses the region converted by the conversion unit 9 as a trigger condition, and generates a trigger signal and outputs it to the waveform memory 2 when determining that each of the waveform data displayed in the X-Y direction is included in this region. The conversion unit 10 and the trigger detection unit 11 are determination units.

  The operation of such an apparatus will be described. First, the setting of the trigger condition will be described. Here, FIG. 2 is a diagram illustrating an example of a closed region displayed on the display screen of the display unit 6. FIG. 2 shows an example in which the X axis is channel CH1, the Y axis is channel CH2, the lower limit value of each axis is −5 [V], and the upper limit value is +5 [V]. FIG. 3 is a flowchart showing an operation for generating the closed region 100.

  First, the closed region generation unit 9 displays two cursors CX1, CX2 on the X axis and two cursors CY1, CY2 on the Y axis with the XY waveform displayed, and these four cursors. A closed region 100 is generated. And according to a user's operation, the operation control part 3 outputs the operation content regarding a trigger condition to the closed area | region production | generation part 9 via CPU8. Then, the closed region generation unit 9 monitors the change of the condition in the X axis direction of the closed region, and when the condition is changed, the window trigger condition of the channel (CH1 in FIG. 2) assigned to the X axis is set. Change (S10, S11).

  When the condition in the X-axis direction is not changed or when the condition in the Y-axis direction of the closed region is changed after the end of the X-axis change, the window trigger condition for the channel (CH2 in FIG. 2) assigned to the Y-axis Is changed (S12, S13)

  When the condition in the Y-axis direction is not changed or after the change of the Y-axis is completed, the closed region generation unit 9 displays the closed region 100 on the XY display screen with the cursors CX1, CX2, CY1, and CY2 as shown in FIG. Redraw as shown (S12, S14).

  Then, the closed region generation unit 9 outputs the redrawn closed region 100 to the conversion unit 10. That is, the channel assigned to each axis and the cursor position on each axis are output to the conversion unit 10. Further, the conversion unit 10 converts the closed region 100 generated on the XY coordinate into a region on the tY coordinate. Specifically, for example, in the case of the X axis, the larger value of the X axis region boundary (the region sandwiched between the cursors CX1 and CX2 and the other boundary) is set to the upper limit value of the window trigger, and the X axis region boundary Set the smaller value as the lower limit of the window trigger. In FIG. 2, the cursor CX1 is the upper limit value of the window trigger of the channel CH1. The cursor CX2 becomes the lower limit value of the window trigger of the channel CH1. Similarly, each of the cursors CY1 and CY2 becomes the upper limit value and the lower limit value of the window trigger of the channel CH2. And the condition which ANDed the window trigger of channel CH1, CH2 is made into a trigger condition, and is output to the trigger detection part 11 (S15).

  When the generation of the closed region 100 is finished, the setting of the trigger condition is finished (S16). When the generation of the closed region 100 is not finished, each axis is changed, redrawn, and the trigger condition is output (S16, S11). To S15).

  Subsequently, an operation of generating a trigger signal and acquiring waveform data will be described. Each of the measurement units 1 converts the input waveforms of the input channels CH1 to CH4 into digital signals by an AD converter provided in the measurement unit 1, and outputs the digital signals to the waveform memory 2 and the trigger detection unit 11 as waveform data.

  Then, when the trigger detection unit 11 receives the input waveforms of the channels CH1 and CH2 in the closed region 100 (region obtained by ANDing the window trigger of the channel CH1 and the window trigger of the channel CH2) 100 generated by the closed region generation unit 9. When the determination is made, that is, when an input waveform that is a trigger condition is detected, a trigger signal is output to the waveform memory 2. According to this trigger signal, the waveform memory 2 stores desired waveform data.

  Then, the CPU 8 reads the waveform data in the waveform memory 2 in accordance with the operation content from the operation control unit 3, temporarily stores the waveform data and the operation content in the RAM 5, performs data processing, and via a display processing unit (not shown). The display unit 6 outputs the result of XY waveform display and waveform analysis. Note that the closed region 100 may be displayed together with the XY waveform.

  That is, the operation of generating the trigger signal and acquiring the waveform data is almost the same as the operation of the apparatus shown in FIG.

  In this way, the closed region generation unit 9 sets the trigger condition closed region 100 as the trace position of the XY waveform in the region where the XY waveform is displayed, and the conversion unit 10 moves on the XY coordinates. The trigger condition is converted into a trigger condition on the t-Y coordinate. That is, the user can set the trigger condition while viewing the XY waveform indicating the correlation between the two input waveforms, and can visually set the closed region 100. Thereby, the XY waveform which becomes a desired condition can be measured. Therefore, the XY waveform can be easily analyzed.

In addition, this invention is not limited to this, The following may be sufficient.
In the apparatus shown in FIG. 1, when the trigger detection unit 11 determines that an XY waveform has entered the closed region 100, the trigger signal is output to the waveform memory 2. For example, as shown in FIG. If it is determined that the XY waveform 200 is output from the closed region 101, a trigger signal may be output to the waveform memory 2.

  Further, in the apparatus shown in FIG. 1, the configuration in which the closed region generation unit 9 provides only one closed region 100 is shown, but a plurality of closed regions 102 to 104 may be provided as shown in FIG. 5. Of course, the conversion unit 10 converts each of the closed regions 102 to 104 into a window on the t-Y coordinate and outputs the window to the trigger detection unit 11.

  In the apparatus shown in FIG. 1, the trigger detection unit 11 outputs a trigger signal using the closed region 100 as a trigger condition. However, a search unit (not shown) is provided, and the search unit uses the closed region as a search condition. Alternatively, a desired set of waveform data may be retrieved from the waveform memory 2 which is a waveform data storage unit. That is, the waveform memory 2 often stores a plurality of sets of waveform data for displaying XY waveforms. Note that the conversion unit 10 and a search unit (not shown) are determination units. Further, the search unit (not shown) performs a search on the t-Y coordinate similarly to the trigger detection unit 11.

  Therefore, the closed region generated by the closed region generation unit 9 is converted into a region on the t-Y coordinate by the conversion unit 10, and the converted region is output to a search unit (not shown). A search unit (not shown) searches from the waveform data set in the waveform memory 2. For example, if it is determined that the input waveforms of the channels CH1 and CH2 are included in the region converted by the conversion unit 10 (part or all), a set of waveform data that matches the search condition is extracted.

  Here, it demonstrates using FIG. In FIG. 6A, each waveform 202 to 207 is a set of waveform data stored in the waveform memory 2. The closed region 105 is a region that is generated by the closed region generation unit 9 and serves as a search condition. Then, a search unit (not shown) extracts a set of waveform data (waveform 206) that matches the search condition, and displays an XY waveform as shown in FIG. 6B.

  As described above, the closed region generation unit 9 sets the search region closed region 105 as the trace position of the XY waveform in the region where the XY waveform is displayed, and the conversion unit 10 sets the XY waveform on the XY coordinate. The search condition is converted into a search condition on the t-Y coordinate. That is, the user can set the search condition while viewing the XY waveform indicating the correlation between the two input waveforms, and can visually set the closed region 105. As a result, a set of waveform data serving as a desired search condition can be easily searched from the waveform memory 2. Therefore, the XY waveform can be easily analyzed.

  Further, in the apparatus shown in FIG. 1, the trigger detection unit 11 outputs a trigger signal using the closed region 100 as a trigger condition. However, a waveform determination unit (not shown) is provided, and the closed region is used as a waveform determination condition. XY waveform determination (determination of whether the waveform is normal or abnormal) may be performed. The conversion unit 10 and a waveform determination unit (not shown) are determination units. In addition, a waveform determination unit (not shown) performs waveform determination on the t-Y coordinate similarly to the trigger detection unit 11.

  Therefore, the closed region generated by the closed region generation unit 9 is converted into a region on the t-Y coordinate by the conversion unit 10, and the converted region is output to a waveform determination unit (not shown). Then, a waveform determination unit (not shown) determines the waveform of the XY waveform. For example, if it is determined that at least some of the input waveforms of the channels CH1 and CH2 are out (or included) from the region converted by the conversion unit 10, it is determined as an abnormal waveform and an alarm is output.

  As described above, the closed region generation unit 9 sets the closed region of the determination condition as the trace position of the XY waveform in the region where the XY waveform is displayed, and the conversion unit 10 determines the determination on the XY coordinate. The condition is converted into a determination condition on the t-Y coordinate. That is, the user can set the determination condition while viewing the XY waveform indicating the correlation between the two input waveforms, and can visually set the closed region. Thereby, it can be easily determined whether the XY waveform is an abnormal waveform or a normal waveform under a desired determination condition. Therefore, the XY waveform can be easily analyzed.

  Furthermore, in the apparatus shown in FIG. 1, the configuration in which the closed region 100 is a quadrangular shape is shown, but the closed region may have any shape, and may be a closed region surrounded by a curve.

It is a block diagram which shows one Example of this invention. It is a figure explaining an example of a closed region. It is a flowchart explaining operation | movement of the apparatus shown in FIG. It is the figure which showed the other example of the trigger conditions. It is the figure which showed an example which provided multiple closed areas. It is the figure which showed an example of the search of the set of waveform data. It is the figure which showed the structure of the conventional waveform measuring apparatus. It is the figure which showed the example of the trigger conditions in a tY waveform. It is the figure which showed the other example of the trigger conditions in a tY waveform.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Measurement part 2 Waveform memory 6 Display part 9 Closed area production | generation part 10 Conversion part 11 Trigger detection part CH1-CH4 Input channel

Claims (4)

Of the waveform data measured by the measurement unit assigned to each of the plurality of input channels, one of the desired two-channel waveform data is set as X-axis data, and the other waveform data is set as Y-axis data. In the waveform measuring apparatus for displaying the XY waveform in
A closed region generating unit that generates a closed region with four cursors including two cursors on the X axis and two cursors on the Y axis on the display screen on which the XY waveform is displayed;
A determination unit that determines whether each of the X-axis data and the waveform data of the Y-axis data displayed as an XY waveform is contained in the closed region on the XY coordinate generated by the closed region generation unit. When
Provided,
The determination unit
A conversion unit that converts the closed region on the XY coordinate generated by the closed region generation unit into a region on the tY coordinate using the X-axis data as time and the Y-axis data as the waveform data;
A trigger detection unit that generates a trigger signal using the region converted by the conversion unit as a trigger condition;
Waveform measuring apparatus characterized by having a. Of the waveform data measured by the measurement unit assigned to each of the plurality of input channels, one of the desired two-channel waveform data is set as X-axis data, and the other waveform data is set as Y-axis data. In the waveform measuring apparatus for displaying the XY waveform in
A closed region generating unit that generates a closed region with four cursors including two cursors on the X axis and two cursors on the Y axis on the display screen on which the XY waveform is displayed;
A determination unit that determines whether each of the X-axis data and the waveform data of the Y-axis data displayed as an XY waveform is contained in the closed region on the XY coordinate generated by the closed region generation unit. When,
A waveform data storage unit for storing a plurality of sets of waveform data for displaying XY waveforms;
Provided,
The determination unit
A conversion unit that converts the closed region on the XY coordinate generated by the closed region generation unit into a region on the tY coordinate using the X-axis data as time and the Y-axis data as the waveform data;
A search unit for searching for a desired set of waveform data from the waveform data storage unit using the converted area of the conversion unit as a search condition;
Waveform measuring apparatus characterized by having a. Of the waveform data measured by the measurement unit assigned to each of the plurality of input channels, one of the desired two-channel waveform data is set as X-axis data, and the other waveform data is set as Y-axis data. In the waveform measuring apparatus for displaying the XY waveform in
A closed region generating unit that generates a closed region with four cursors including two cursors on the X axis and two cursors on the Y axis on the display screen on which the XY waveform is displayed;
A determination unit that determines whether each of the X-axis data and the waveform data of the Y-axis data displayed as an XY waveform is contained in the closed region on the XY coordinate generated by the closed region generation unit. When
Provided,
The determination unit
A conversion unit that converts the closed region on the XY coordinate generated by the closed region generation unit into a region on the tY coordinate using the X-axis data as time and the Y-axis data as the waveform data;
Using the converted area of this conversion unit as a condition for waveform determination,
Waveform measuring apparatus characterized by having a. Closed region generator, the waveform measuring apparatus according to any one of claims 1 to 3, characterized in that to set a plurality of closed regions.

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