JP2003207524A - Waveform recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waveform display device capable of simultaneously recording a trend waveform and a transitional waveform with a relatively small memory capacity by simultaneously storing measured waveform data at different intervals in a memory on the basis of two or more trigger signals. <P>SOLUTION: In this waveform recording device for recording computerized measured waveform data, the measured waveform data are simultaneously stored in the memory at different intervals by each trigger signal when the measured waveform data satisfy two or more preliminarily independently set trigger conditions. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform recording device for digitizing a predetermined input and storing it in a memory, and more particularly to a waveform recording device for improving the efficiency of waveform analysis work by simultaneously storing a trend waveform and a transient waveform. It is about.

[0002]

2. Description of the Related Art In a conventional waveform recording apparatus, only one sampling sampling rate can be set in the memory. Therefore, if it is attempted to simultaneously record a transient waveform that occurs in a short time while monitoring a long-term trend of the observed waveform, the sampling rate must be adjusted to the transient waveform side. Therefore, it is necessary to record at high speed sampling, and a huge memory is required to record the transient waveform while recording the trend waveform. For example, 10M
In the case of the sample, if it is recorded for one day, it will be about 844 G data, which is not realistic even in the recent years when the memory price has dropped. Further, even if a memory is available, it takes a considerable time to extract a necessary portion from such enormous data, and even if the data is obtained, analysis is not realistic.

[0003]

Therefore, at present, it is general to record a trend with a measuring instrument with slow sampling and simultaneously measure a waveform by triggering with a measuring instrument with fast sampling such as an oscilloscope. However, two devices are required. Since the measured waveform data is distributed to two measuring devices, it is difficult to associate the data with each other, and there is a problem that a measuring error occurs between the measuring devices.

The present invention has been made in order to solve the above-mentioned problems, and the measured waveform data is simultaneously stored in the memory at different intervals based on a plurality of trigger signals, so that the trend can be achieved with a relatively small memory capacity. An object is to provide a waveform display device capable of simultaneously recording a waveform and a transient waveform.

[0005]

The present invention is a waveform recording apparatus having the following configuration.

(1) In a waveform recording device for recording digitized measurement waveform data, the measurement waveform data differs depending on each trigger signal when the measurement waveform data satisfies a plurality of trigger conditions set individually in advance. A waveform recording device characterized in that it is stored in a memory simultaneously at intervals. (2) In a waveform recording device for recording computerized measurement waveform data, the first measurement waveform data is preset.
Starting from a time point when a trigger condition is satisfied, a main control means for storing low-speed sampling data of the measured waveform data in a memory, and a time point when the measured waveform data satisfies a preset second trigger condition,
And a sub-control unit that stores high-speed sampling data of the measured waveform data in the memory at the same time as the low-speed sampling data. (3) The main control means includes first trigger detection means for generating a first trigger signal when the measured waveform data satisfies the first trigger condition, and the measured waveform data based on the first trigger signal. The waveform recording apparatus according to (2), further comprising: first memory control means for storing in the memory. (4) The sub-control unit performs a second trigger detection unit that generates a second trigger signal when the measured waveform data satisfies the second trigger condition, and performs a pre-trigger operation based on the second trigger signal. The waveform recording apparatus according to (2), further comprising: second memory control means for storing measured waveform data before and after the generation of the second trigger signal in the memory. (5) Trigger information adding means for adding the generation information of the second trigger signal to the high-speed sampling data is provided, and the low-speed sampling data is stored in association with the low-speed sampling data based on the generation information. The waveform recording device according to any one of (2) to (4). (6) In a waveform recording device for recording computerized measured waveform data, compressed data is generated from the measured waveform data, and the time point at which the measured waveform data satisfies a preset first trigger condition is used as a starting point, and Main control means for storing the compressed data in the memory, and a sub-control for storing the measured waveform data in the memory at the same time as the compressed data, starting from a time point when the measured waveform data satisfies a preset second trigger condition. Means and
A waveform recording device having: (7) The main control means generates a first trigger signal when the measured waveform data satisfies the first trigger condition, and a compressed data from the measured waveform data. The waveform recording apparatus according to (6), further comprising: a data compression unit that stores the compressed data in the memory based on one trigger signal. (8) The sub-control unit performs a second trigger detection unit that generates a second trigger signal when the measured waveform data satisfies the second trigger condition, and performs a pre-trigger operation based on the second trigger signal. The waveform recording apparatus according to (6), further comprising: second memory control means for storing measured waveform data before and after the generation of the second trigger signal in the memory. (9) Trigger information adding means for adding the generated information of the second trigger signal to the compressed data is provided, and the measured waveform data is stored in association with the compressed data based on the generated information. The waveform recording device according to any one of (6) to (8). (10) In a waveform recording device for recording digitized measurement waveform data, a trigger signal is forcibly generated according to a preset trigger generation mode, and low-speed sampling data of the measurement waveform data is stored in a memory based on the trigger signal. Waveform recording, characterized in that the high-speed sampling data of the measurement waveform data is stored in the memory at the same time as the low-speed sampling data is stored, starting from a time point when the measurement waveform data satisfies a preset trigger condition. apparatus. (11) In a waveform recording device for recording digitized measurement waveform data, compressed data is generated from the measurement waveform data, a trigger signal is forcibly generated according to a preset trigger generation mode, and the trigger signal is generated based on the trigger signal. A waveform characterized by storing the compressed data in a memory and storing the measured waveform data in the memory at the same time as the compressed data starting from a time point when the measured waveform data satisfies a preset trigger condition. Recording device.

[0007]

1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, an amplifier 1 normalizes by amplifying or attenuating the measured waveform. The A / D converter 2 converts the normalized measurement waveform into a digital value and digitizes it. The timing controller 8 controls the sampling rate of the A / D converter 2 and the operation timing of the main control unit 3 and the sub control unit 4. The main control means 3 comprises a first trigger detection means 31 and a first memory control means. First trigger detecting means 3
1 generates a first trigger signal when the measured waveform data satisfies a preset first trigger condition. The first memory control means 32 receives the first trigger signal and stores the measured waveform data in the memory 7. The sub control means 4 comprises a second trigger generation means 41 and a second memory control means 42. The second trigger detection means 41 generates a second trigger signal when the measured waveform data satisfies the preset second trigger condition. The second memory control means 42 receives the first trigger signal and stores the measured waveform data in the memory 7. The display controller 9 reads out the measured waveform data stored in the memory 7 and displays it on the display 10. The trigger condition is a trigger level, rising edge detection, falling edge detection, or the like.

For example, in the timing controller 8,
The first memory control means 32 is operated at a timing of 100 kHz, and the second memory control means 42 is operated at a sampling timing of 10 MHz. At the same time, the timing controller 8 operates the A / D converter 2 at the timing of 10 MHz which is the faster sampling rate of the main control means 2 and the sub control means 3. Thereby, the measured waveform data can be simultaneously stored in the memory at different intervals like the low speed sampling data and the high speed sampling data. The timing is shown in FIG. FIG. 2 is an explanatory diagram showing operation timings of the A / D converter and the memory control means. 2, (a) shows the A / D conversion timing, (b) shows the operation timing of the first memory control means, and (c) shows the operation timing of the second memory control means.

Returning to FIG. 1, the main control means 3 starts recording in the memory 7 when the measured waveform data by the first trigger detector 31 satisfies the set trigger condition. The sub-control unit 4 performs a pre-trigger operation based on the second trigger signal of the second trigger detection unit 41, and saves the measured waveform data before and after the trigger is generated in the memory 7 each time the trigger is generated. In the pre-trigger operation, the measured waveform data is repeatedly stored while being updated in a preset memory area, and data is secured in the memory area starting from the time when the trigger is generated. As a result, the data before and after the trigger is generated is recorded. In addition, the first memory control means 32 sends the operating status to the second memory control means 42, and
The memory control means 42 does not write the measured waveform data into the memory 7 except during the operation of the main control means 3.

FIG. 3 is a conceptual diagram of write data in the memory. In FIG. 3, (a) is the measured waveform data sampled at low speed by the main control means 3. (B) is the measured waveform data before and after the trigger, which is sampled at high speed by the sub-control unit 4 and the pre-trigger operation is performed every time the second trigger signal is generated. (C) shows the contents of the memory 7, and the memory 7 is divided into a main data area in which the low-speed sampling data of the measurement waveform is written and a sub-data area in which the high-speed sampling data is written. The low speed sampling data is written in the main data area by the first trigger signal, and the high speed sampling data is written in the sub data area each time the second trigger signal is generated.

As another embodiment, data compression means may be provided instead of the first memory control means 32 of FIG. For example, the data compression means extracts the maximum value and the minimum value from a predetermined number of waveform data obtained continuously and uses them as compressed data. As a result, compressed data is generated from the measured waveform data, and this compressed data is recorded in a predetermined area of the memory 7 instead of the low speed sampling data.

Further, there may be provided trigger information adding means for adding trigger information to the data stored in the above-mentioned main data area by the main control means when the second trigger is generated by the sub-control means. Thereby, a mark such as a marker indicating the occurrence of the second trigger can be displayed on the trend waveform. Here, the addition of the trigger information can be realized by storing the address of the data stored in the main data area when the second trigger occurs or adding bit data or the like to the measured waveform data itself.

Further, a trigger signal for taking in the low-speed sampling data or the compressed data is forcibly generated in accordance with a preset trigger generation mode, and the trigger signal causes the above-mentioned first memory control means or data compression means. It may be operated. The trigger generation mode includes roll operation, external trigger operation, etc., and can be arbitrarily selected and set. The roll operation is an operation mode in which the trigger signal is forcibly generated and the measured waveform data is always stored in the memory so that the recorder always records the measurement result on the chart paper. In the roll operation, a trigger signal may be generated by a manual operation or the like to operate the first memory control means or the data compression means. As a result, the memory loading of the measured waveform data can be started without waiting for the trigger, and the measured waveform data can be constantly monitored.

[0015]

The present invention has the following effects.

According to the first to fourth aspects of the present invention, since there are a plurality of trigger detecting means and a plurality of memory control means for storing the measured waveform data in the memory, the measured waveform data can be simultaneously stored in the memory at different intervals. You can Therefore, a trend waveform and a transient waveform can be simultaneously recorded with a relatively small memory capacity, and a waveform recording device effective for waveform analysis can be realized. Furthermore, since each sampling speed can be set independently, the amount of trend waveform data and transient waveform data can be controlled, the trend waveform side can be sampled at a lower speed to reduce the memory capacity, and the transient waveform side can be reduced. It is possible to easily realize higher-speed sampling to improve the resolution of the transient waveform.

According to the fifth and ninth aspects of the present invention, by adding the trigger information to the data stored in the main data area by the main control means, the marker indicating the occurrence of the second trigger on the trend waveform. It is possible to display a mark such as “etc.”, and it becomes easy to recognize at which point in time the trend waveform has changed.

According to the sixth to eighth aspects of the invention, there are a plurality of trigger detecting means and a plurality of memory control means for storing the measured waveform data in the memory, one of which compresses the measured waveform data and the other of which compresses the uncompressed data. Store in memory simultaneously. This allows trend waveform data and transient waveform data to be stored simultaneously in memory at different intervals.
A trend recording and transient waveform can be recorded simultaneously with a comparatively small memory capacity, and a waveform recording device effective for waveform analysis can be realized.

According to the tenth and eleventh aspects of the present invention, since the trigger signal is forcibly generated in accordance with the preset trigger generation mode, the memory loading of the measured waveform data is started without waiting for the trigger. . Therefore, it is possible to record transient data such as a waveform abnormality that suddenly occurs at the same time while always recording the trend waveform of the measured waveform that is low-speed sampling data or compressed data. As a result, it is possible to realize a waveform recording device that is effective for constant monitoring of measured waveform data.

[0020]

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing operation timing in the embodiment of the present invention.

FIG. 3 is a conceptual diagram of write data in a memory according to the embodiment of the present invention.

[Explanation of symbols]

3 Main control means 4 Sub-control means 7 memory 8 Timing controller 31 First Trigger Detection Means 32 First memory control means 41 Second trigger detection means 42 Second memory control means

Claims (11)

[Claims] 1. A waveform recording apparatus for recording computerized measurement waveform data, wherein the measurement waveform data is different in interval depending on each trigger signal when the measurement waveform data satisfies a plurality of trigger conditions set individually beforehand. The waveform recording device is characterized in that it is simultaneously stored in a memory. 2. A waveform recording device for recording digitized measurement waveform data, wherein low-speed sampling data of the measurement waveform data is stored in a memory starting from a time point when the measurement waveform data satisfies a preset first trigger condition. A main control means for storing the high speed sampling data of the measurement waveform data in the memory at the same time as the low speed sampling data, starting from a point of time when the measurement waveform data satisfies a preset second trigger condition. A waveform recording apparatus comprising: a control unit. 3. The main control means includes first trigger detection means for generating a first trigger signal when the measured waveform data satisfies the first trigger condition, and measured waveform data based on the first trigger signal. 3. The waveform recording device according to claim 2, further comprising: first memory control means for storing in the memory. 4. The sub-control means includes a second trigger detection means for generating a second trigger signal when the measured waveform data satisfies the second trigger condition, and a pre-trigger operation based on the second trigger signal. Done,
The waveform recording apparatus according to claim 2, further comprising: second memory control means for storing measured waveform data before and after the generation of the second trigger signal in the memory. 5. A trigger information adding means for adding the generation information of the second trigger signal to the high speed sampling data is provided, and the low speed sampling data is stored in association with the high speed sampling data based on the generation information. The waveform recording device according to any one of claims 2 to 4, characterized in that: 6. A waveform recording device for recording digitized measurement waveform data, wherein compressed data is generated from the measurement waveform data, and a point of time when the measurement waveform data satisfies a preset first trigger condition is used as a starting point. , Main control means for storing the compressed data in a memory, and the measured waveform data is stored in the memory at the same time as the compressed data starting from a time point when the measured waveform data satisfies a preset second trigger condition. A waveform recording apparatus comprising: a sub-control unit. 7. The main control means, first trigger detection means for generating a first trigger signal when the measured waveform data satisfies the first trigger condition, and generates compressed data from the measured waveform data, The first
7. The waveform recording device according to claim 6, further comprising: a data compression unit that stores the compressed data in the memory based on a trigger signal. 8. The sub-control means includes a second trigger detection means for generating a second trigger signal when the measured waveform data satisfies the second trigger condition, and a pre-trigger operation based on the second trigger signal. Done,
7. The waveform recording device according to claim 6, further comprising: second memory control means for storing the measured waveform data before and after the generation of the second trigger signal in the memory. 9. A trigger information adding means for adding the generation information of the second trigger signal to the compressed data, and storing the measured waveform data in association with the compressed data based on the generation information. The waveform recording device according to any one of claims 6 to 8. 10. A waveform recording device for recording digitized measurement waveform data, forcibly generating a trigger signal according to a preset trigger generation mode, and based on the trigger signal, low-speed sampling data of the measurement waveform data. In addition to being stored in the memory, the high-speed sampling data of the measurement waveform data is stored in the memory at the same time as the low-speed sampling data, starting from a time point when the measurement waveform data satisfies a preset trigger condition. Waveform recording device. 11. A waveform recording device for recording digitized measured waveform data, wherein compressed data is generated from the measured waveform data, a trigger signal is forcibly generated in accordance with a preset trigger generation mode, and the trigger signal is generated. Storing the compressed data in a memory based on the above, and storing the measured waveform data in the memory at the same time as the compressed data, starting from a time point when the measured waveform data satisfies a preset trigger condition. Waveform recording device.