JPH0518657Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a recorder whose recording or display operation is controlled based on predetermined trigger conditions. The present invention relates to a trigger control device for a recorder that controls start and end.

[Conventional technology]

In a recorder, such as a real-time waveform recorder,
It does not have a storage means for measured waveform data, and the measured data is recorded or displayed sequentially. If you do not need all the measured data and want to see data after a preset condition, the system is configured to trigger when the set level is reached and record or display the measured data after that. There is. Recording or displaying is stopped manually by an external stop signal, or by automatically outputting a stop signal after a preset time has elapsed from the input of a trigger signal. Thereby, only the measurement data after the desired conditions can be displayed or recorded on the recording paper.

[The problem that the idea aims to solve]

However, if you manually stop the desired data after it has risen to a predetermined level and until it rises again to the predetermined level, you must always check the display means of the recorder and the state of the recording paper. Must be watching. Therefore, if it takes a long time for the temperature to rise or fall to a predetermined level again, the person taking the measurement cannot leave the recorder, which becomes a considerable burden. On the other hand, if you want to stop automatically after the set time has elapsed, you do not need to be near the recorder during the measurement, but if you can estimate to some extent how long it will take to rise to the specified level again, you can set that time. OK, but if you can't guess, you need to set an appropriate time.
If the time is longer than this estimated time, the display or recording will be cut off in the middle of the measurement data. Therefore, it is necessary to repeat the measurement after setting a longer time than the previous time, which not only wastes time but also wastes recording paper.

Therefore, an object of this invention is to provide a recorder which improves the above-mentioned drawbacks by controlling both the start and stop of display and recording using a trigger signal.

[Means to solve the problem]

This device compares input data with a preset trigger condition, and performs trigger detection in a trigger control device of a recorder that records or displays input data around the point in time when the condition is met. The means constantly monitors the input data, and only when the input data that satisfies the trigger condition increases or decreases with the previous input data, starts recording or displaying the subsequent input data, and then starts recording or displaying the input data again. It is characterized in that it outputs a signal to stop recording or display when the same condition as the start condition is reached.

[Effect]

Therefore, according to this invention, the input signal that has reached a predetermined level can be automatically recorded or displayed under the same conditions until it reaches the predetermined level again by the trigger signal, and the desired input signal can be automatically recorded or displayed. Only data can be reliably recorded or displayed.

〔Example〕

Below, we will explain a drawing showing an example of a waveform recorder in which an embodiment of this invention is used. An input terminal 1 to which an analog waveform signal is input is connected to an input amplifier 2 that controls the gain of the input signal. and is connected to an A/D converter 3 that converts an analog input signal into a digital signal. The A/D converter 3 is connected to a CPU 4 as a central processing unit. Connected to the CPU 4 are a ROM 5 in which the operating program is written, a RAM 6 that stores operating conditions such as trigger levels, a display section 7 such as a CRT, and a recording section 8 such as a printer. A/
A trigger detection section 9 is connected to the D converter 3 and the CPU 4, and constantly samples the digital input signal from the A/D converter 3, compares it with the trigger level from the CPU 4, and determines whether the digital input signal exceeds the trigger level. When it crosses toward or crosses the trigger level, that is, when it crosses the trigger level while rising, it sends a trigger pulse to the CPU 4.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG. first,
The CPU 4 initializes the RAM 6, display section 7, recording section 8, and trigger detection section 9. Then,
The CPU 4 inputs trigger level data set by external means (not shown) and stored in the RAM 6 to the trigger detection section 9, and inputs the trigger level data to the A/D converter 3.
It is possible to accept a trigger check for a digital input signal sampled from a digital input signal.
When an analog waveform signal is input to the input terminal 1, this input signal is converted into a digital signal by the A/D converter 3, and then applied to the CPU 4 and the trigger detection section 9. The digital input signal constantly sampled by the D converter 3 is compared with the trigger level from the CPU 4, and when the digital input signal crosses the trigger level upward, that is, point A in FIG. The first trigger pulse when the CPU is located at
Send to 4. Since the digital signal is constantly sampled, it can be easily determined whether the waveform crossing the trigger level is a rising waveform or not by comparing it with the value of the digital signal just before that.

With this first trigger pulse, CPU4
Operate the display section 7 and/or recording section 8, and
Start recording and displaying waveforms from a point. CPU4
confirms the occurrence of this first trigger pulse,
The trigger detection unit 9 is again enabled to accept the next trigger. As shown in FIG. 3, the input waveform also crosses the trigger level at point C, but at this time it crosses the trigger level downward, that is, it crosses the trigger level as it descends, so the trigger detection unit 9 No trigger pulse is output. Next, at point B, the waveform crosses the rising waveform as at point A, so a second trigger pulse is output. This causes the CPU 4 to stop the operation of the display section 7 and/or the recording section 8.
Instructions are given to the display unit 7 and recording unit 8 via the ROM 5. Therefore, the display section 7 and the recording section 8 have a third
In the figure, only the waveform from point A to point B is recorded or displayed.

In this embodiment, the trigger detection section 9 outputs a trigger pulse when the rising waveform crosses the trigger level, but outputs the trigger pulse only when the falling waveform crosses the trigger level. Alternatively, a trigger pulse may be output when the trigger level is crossed either when rising or falling. Also, the trigger level is
Although it is stored in the RAM 6, a trigger signal may be directly applied to the trigger detection section 9 from the outside. Furthermore, although this embodiment has been explained using a real-time waveform recorder as an example, it can also be applied to trigger control of a memory-type waveform recorder configured to temporarily store waveform data in a storage RAM. Of course, in this case, it may be performed based on data retrieved from the storage RAM.

[Effect of idea]

As described above, the trigger control device in the recorder of this invention can control both the start and stop of recording or display by the trigger signal,
Moreover, it starts and stops only when, for example, the input data increases compared to the previous input data, so it is possible to reliably and automatically record and display the data up to the level of the trigger signal again. , accurate data can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of this invention, FIG. 2 is a flowchart for explaining its operation, and FIG. 3 is a waveform diagram showing an input waveform and its recorded portion. In the drawing, 1 is an input terminal, 2 is an input amplifier, 3 is an A/D converter, 4 is a CPU, 5 is a ROM,
6 is a RAM, 7 is a display section, 8 is a recording section, and 9 is a trigger detection section.

Claims (1)

[Scope of utility model registration request] In a trigger control device for a recorder that compares input data with a preset trigger condition and records or displays the input data around the time point when the condition is satisfied, a trigger detection means that performs the comparison with the trigger condition is provided. , constantly monitors the input data, compares the input data when the trigger condition is met with the input data immediately before, and starts recording or displaying the subsequent input data only when the input data increases or decreases. A trigger control device for a recorder, characterized in that it outputs a signal for stopping recording or display when the same starting condition is met again.