JP2001194389A - Waveform measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveform measuring device capable of surely reading the measurement data of an event satisfying a trigger condition having a high degree of importance into a memory. SOLUTION: This waveform measuring device capable of setting a plurality of trigger conditions for reading measurement data to the memory comprises a means for prioritizing the respective trigger conditions and a means for determining the order of priority of the trigger conditions in the establishment of these trigger conditions, so that the measurement data of the event where the trigger conditions are established can be read into the memory on the basis of the order of priority.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform measuring device, and more particularly to an improvement in a trigger function.

[0002]

2. Description of the Related Art Waveform measuring devices convert various phenomena, such as mechanical, chemical, biological, and geological, into electrical signals using sensors suitable for each of the phenomena, and load the signals into a memory as measurement data. Is visualized as a waveform on a display screen or a recording paper, and is widely used in various fields.

Incidentally, the capacity of a memory for storing measurement data of such a waveform measuring apparatus is limited, and it is impossible to capture all the measurement data without fail. Therefore, a plurality of measurement data acquisition conditions are set as trigger conditions in accordance with each measurement purpose, and when those trigger conditions are satisfied, a predetermined number of measurement data is acquired into a memory based on the time. ing.

However, no special consideration is given to the priority of a plurality of trigger conditions in a conventional waveform measuring apparatus, and it is a so-called first-come-first-served state, and when any of a plurality of trigger conditions is satisfied, the event is measured immediately. Perform data capture. Until the acquisition of the measurement data is completed, the establishment of other trigger conditions is completely ignored.

FIG. 3 is a flowchart showing an outline of such a conventional measurement data fetching process. Data is acquired by starting the measurement operation (ST
1). It is determined whether or not the acquired data satisfies the trigger condition (ST2). If the trigger condition is satisfied, a data storage process for loading the data into the memory is performed (ST
3) If not satisfied, return to ST1 to acquire the next data. After the data storage processing, it is determined whether or not a predetermined number of data set in advance has been stored (ST4). The processing after ST3 is repeated until the predetermined number of data is captured, and the processing is performed after the predetermined number of data is captured. finish.

FIG. 4 is an explanatory diagram for taking in measurement data in a conventional waveform measuring apparatus. In FIG. 4, it is set that the trigger is established when the measured data of Ch1 becomes higher than level 1 and the trigger is established when the measured data of Ch2 becomes lower than level 2; Ten pieces of measurement data are taken in from the time when the trigger is established.

That is, the measured data of Ch1 is level 1
The trigger is established when the level becomes higher than
The acquisition of the measured data of the point Ch1 is started. Focusing on the measured data of Ch2, the level is lower than the level 2 immediately before the ninth measured data of Ch1, but since a predetermined number of measured data of Ch1 has not been completely captured, the measured data of Ch2 is not completed. The satisfaction of the trigger condition is ignored.

As a result, for example, the trigger condition of Ch2 is C
Even if the degree of importance is higher than the trigger condition of h1, Ch2
Measurement data cannot be captured.

[0009]

SUMMARY OF THE INVENTION The present invention focuses on such a problem of the conventional waveform measuring apparatus,
It is an object of the present invention to provide a waveform measuring apparatus that can reliably store measurement data of an event that satisfies a trigger condition of high importance in a memory.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a waveform measuring apparatus capable of setting a plurality of trigger conditions for loading measurement data into a memory. Means for prioritizing each trigger condition and means for determining the priority of the trigger conditions when a plurality of trigger conditions are satisfied are provided, and the measurement data of the event for which the trigger condition is satisfied is determined based on the priority. It is characterized in that it is taken into a memory.

Thus, when an event that satisfies the trigger condition with a higher priority occurs, the measurement data of the event is preferentially taken into the memory, so that an important event can be reliably measured.

The second aspect of the present invention is the first aspect of the present invention.
In the waveform measurement device described above, the trigger condition is set with a priority order for each channel in order to load measurement data of a plurality of channels into a memory, and the measurement data of a channel for which the trigger condition is satisfied is stored based on the priority order. It is characterized by taking in.

In the case of a configuration in which the measurement data of a plurality of channels is fetched into a common memory, the fetch control of the measurement data can be performed based on the priority of the trigger condition.

The third aspect of the present invention is the first aspect of the present invention.
Alternatively, in the waveform measuring device according to claim 2, when there is no free space in the memory for acquiring the measurement data of the event in which the trigger condition with the higher priority is satisfied, the memory is overwritten and acquired.

The memory always takes in the measurement data of the event in which the trigger condition having the highest priority at that time is satisfied.

The invention according to claim 4 of the present invention is the invention according to claim 2
In the waveform measurement device described above, when the trigger conditions of a plurality of channels conflict with each other, the memory discards the measurement data of the event in which the low-priority trigger condition is satisfied and stores the event in which the high-priority trigger condition is satisfied in the memory. Characterized by taking in measurement data

In a configuration in which the measurement data of a plurality of channels is taken into a common memory, the measurement data of a channel having a higher priority in the trigger condition can be taken in reliably.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of measurement data acquisition by a waveform measuring apparatus according to the present invention, and shows a measurement example of two channels similar to FIG. The difference between FIG. 1 and FIG. 4 is that the priority of the trigger condition of Ch2 is set higher than that of Ch1, and the loading of the measurement data into the memory is controlled based on the priority.

In FIG. 1, the trigger is established when the measured data of Ch1 becomes higher than the level 1, so that the acquisition of the measured data of Ch1 at 10 points is started. On the other hand, focusing on the measured data of Ch2,
Immediately before the ninth measurement data of h1, the level becomes lower than the level 2, and the trigger condition of Ch2 is satisfied. Since the priority of the trigger condition of Ch2 is set higher than that of Ch1, the process of taking in the measurement data of Ch1 with a lower priority during execution is immediately suspended, and the measurement data of Ch1 already stored in the memory is stopped. Discard and initialize. Then, based on the satisfaction of the trigger condition of Ch2, Ch2
Of 10 measurement data, and 10 data are taken.

Thus, in the waveform measuring apparatus configured to capture the measured data of Ch1 and Ch2 into the common memory, the measured data of Ch2 having the higher priority of the trigger condition is reliably captured.

FIG. 2 is a flowchart showing the procedure of the process of FIG. As in FIG. 3, data is acquired by starting the measurement operation (ST1). It is determined whether or not the acquired data satisfies the trigger condition (ST2). If the trigger condition is satisfied, a data storing process for loading the data into the memory is performed (ST3).
Returning to T1, the next data is acquired. After the data storage processing, it is determined whether or not a predetermined number of data set in advance has been stored (ST4), and when the predetermined number of data has been fetched, the processing ends. The processes after ST3 are repeated until a predetermined number of data is fetched. In this repetition process, it is determined whether or not the priority of the trigger condition is higher for each of the acquired data than that currently stored (ST5). ,
If it is not higher, the processes after ST3 are repeated. If the priority of the trigger condition of the acquired data is high, the already stored data is discarded and the data storage processing is initialized (S
T6), and execute the processing after ST3.

When fetching measurement data of an event for which a high-priority trigger condition is satisfied, the memory may overwrite the already stored measurement data if there is no free space in the memory. Good.

Thus, the measured data of the event in which the trigger condition having the highest priority at that time is satisfied is always taken into the memory.

Further, the present invention is not limited to the case where the measurement data of a plurality of channels is taken into a common memory. This is also effective when the measured data of the event for which the trigger condition of the highest priority is satisfied at that time is always taken into the memory where is limited.

The trigger condition in the present invention may be set as a signal level, may be set as a waveform pattern, or may be a combination of these. You can use them properly.

[0026]

As described above, according to the present invention,
It is possible to realize a waveform measuring device that can reliably store measurement data of an event that satisfies a trigger condition of high importance in a memory.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a measured data capturing state of a waveform measuring apparatus according to the present invention.

FIG. 2 is a flowchart illustrating a processing procedure of FIG. 1;

FIG. 3 is an explanatory diagram of a state in which measurement data is captured by a conventional waveform measurement device.

FIG. 4 is a flowchart showing a processing procedure of FIG. 3;

[Explanation of symbols]

 Data Measurement data Level Trigger level

Claims (5)

[Claims] 1. A waveform measuring apparatus capable of setting a plurality of trigger conditions for loading measured data into a memory, a means for prioritizing each trigger condition, and a method for setting a trigger condition when the plurality of trigger conditions are satisfied. A waveform measuring device comprising: means for determining a priority order; and taking measured data of an event for which a trigger condition is satisfied into a memory based on the priority order. 2. The waveform measuring apparatus according to claim 1, wherein the trigger condition is set with a priority order for each channel in order to load measurement data of a plurality of channels into a memory, and the measurement of the channel for which the trigger condition is satisfied is set. A waveform measuring device for taking data into a memory based on priority. 3. The waveform measuring apparatus according to claim 1, wherein when there is no free space in the memory for acquiring measurement data of an event for which a high-priority trigger condition is satisfied, the memory is overwritten and acquired. Characteristic waveform measuring device. 4. The waveform measuring apparatus according to claim 2, wherein
When the trigger conditions of a plurality of channels conflict with each other, the memory may discard the measurement data of the event in which the low-priority trigger condition is satisfied and capture the measurement data of the event in which the high-priority trigger condition is satisfied. Characteristic waveform measuring device. 5. The waveform measuring apparatus according to claim 1, wherein the trigger condition is set as at least one of a signal level and a waveform pattern.