JP2011069767A - Waveform recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waveform recording apparatus capable of recording waveform data containing an abnormal signal focused on by a user by allowing recording of large-capacity measurement data between arbitrary points before and after a trigger or an alarm, and efficiently performing a subsequent analysis. <P>SOLUTION: The waveform recording apparatus, configured for taking an input signal converted into digital data into an acquisition memory as measurement data, includes an external recorder storing waveform data for recording and an external recording controller controlling recording operation of the waveform data into this external recorder. The apparatus records pre-trigger data exceeding a memory capacity into the external recorder in the form of ring, and records whole large-capacity data before and after the trigger (alarm) by combining this pre-trigger data and post-trigger data after an occurrence of the trigger (alarm). <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a waveform recording apparatus, and more particularly to an improvement in measurement data recording control.

  FIG. 6 is a block diagram showing an example of a recording portion of measurement data in a conventional waveform recording apparatus. In FIG. 6, a measurement unit 1 converts an input signal into digital data and outputs it to the acquisition memory 2 as measurement data. A measurement range circuit for setting an appropriate measurement range according to the magnitude of the input signal, A / It consists of a D converter, an acquisition circuit that adjusts the sample rate, and the like.

  The acquisition memory 2 holds the measurement data converted and output as digital data from the measurement unit 1 in time series.

  The recording waveform memory 3 is a buffer memory that holds waveform data to be recorded that is read from the acquisition memory 2 and recorded in a storage medium (not shown), and is generally measured data converted and output from the measuring unit 1. Is stored as is.

  The trigger / alarm control unit 4 detects the trigger of the input signal measured by the measurement unit 1 and the state of the alarm, and outputs it to the memory control unit 6 as trigger / alarm information.

  The measurement control unit 5 sets various measurement parameters for measurement by the measurement unit 1 and sets desired measurement conditions, and controls the start and stop of the measurement operation. The set measurement conditions are also output to the memory control unit 6.

  The memory control unit 6 determines measurement data to be read from the acquisition memory 2 to the recording waveform memory 3 based on the trigger / alarm information input from the trigger / alarm control unit 4 and the measurement conditions input from the measurement control unit 5.

  FIG. 7 is a diagram for explaining the operation in the acquisition memory 2 of FIG. 6 and shows an example of the trigger mode. Measurement data D1 having a specified number of points between the trigger point TP and the pre-trigger point T1 positioned before the trigger point TP, and a specified number of points between the trigger point TP and the post-trigger point T2 positioned after the trigger point TP The measurement data for the designated number of points D = D1 + D2 combined with the measurement data D2 can be read from the acquisition memory 2 after measurement and recorded as a file every time a trigger occurs.

  FIG. 8 is also an explanatory diagram of the operation in the acquisition memory 2 of FIG. 6 and shows an example of the free-run mode. In the free-run mode, measurement data of a predetermined designated number D from the trigger point TP can be sequentially read from the acquisition memory 2 during measurement and recorded in a file every time a trigger occurs. That is, measurement data can be taken out from the acquisition memory 2 and recorded in a file while taking measurements, and data recording exceeding the size of the acquisition memory 2 can be performed.

  Patent Document 1 describes a waveform analysis apparatus that improves the operability of waveform analysis while recording for a long time.

JP 2009-115547 A

  However, according to the conventional configuration shown in FIG. 6, in the trigger mode, the pre-trigger point number D1 cannot be ensured exceeding the memory capacity of the acquisition memory 2 as shown in the operation explanatory diagram of FIG. Is generated before the pre-trigger point T1 of the measurement signal S, the abnormal waveform Ssp cannot be recorded in the file.

  In the free-run mode, after the trigger or alarm is generated, the measurement data is read from the acquisition memory 2 and recorded in a file, so there is no limitation on the memory capacity of the acquisition memory 2, but the measurement before the trigger or alarm occurs. Data could not be recorded to a file.

  Furthermore, in the free-run mode, all measurement data can be recorded without being missed, but in this case, there is a drawback that the file size becomes large and the subsequent analysis becomes very difficult.

  The present invention solves these problems, and its purpose is to record a large amount of measurement data between arbitrary points before and after a trigger or an alarm, and record waveform data including an abnormal signal to which a user pays attention. An object of the present invention is to provide a waveform recording apparatus that can perform subsequent analysis efficiently.

In order to achieve such a problem, the invention according to claim 1 of the present invention is:
In a waveform recording apparatus configured to capture an input signal converted into digital data into an acquisition memory as measurement data,
An external recording unit for storing waveform data for recording and an external recording control unit for controlling the recording operation of the waveform data to the external recording unit are provided,
A predetermined number of pre-trigger measurement data between the trigger point and the pre-trigger point located before the trigger point in the external recording unit, and a predetermined number of points between the trigger point and the post-trigger point located after the trigger point. The post-trigger measurement data is stored as a temporary recording file, and after the trigger is generated, the pre-trigger measurement data and the post-trigger measurement data are combined to record pre-trigger data exceeding the memory capacity of the acquisition memory. .

The invention according to claim 2 is the waveform recording apparatus according to claim 1,
In recording the pre-trigger measurement data in the external recording unit, the storage area is used in a ring shape.

The invention according to claim 3 is the waveform recording apparatus according to claim 1 or 2, wherein
When a trigger occurs, the latest pretrigger measurement data is analyzed to determine whether or not recording is necessary.

The invention according to claim 4 is the waveform recording apparatus according to claim 3,
As an analysis of the pre-trigger measurement data, the average value is compared with a predetermined set value.

  According to the present invention, it is possible to record a large amount of measurement data between arbitrary points before and after a trigger or an alarm, and to record waveform data including an abnormal signal focused on by the user, so that subsequent analysis can be performed efficiently. .

It is a block diagram which shows one Example of this invention. It is operation | movement explanatory drawing in the acquisition memory 2 of FIG. It is a flowchart which shows the flow of operation | movement of FIG. It is operation | movement explanatory drawing which paid its attention to the flow of the measurement data in the flowchart of FIG. It is a flowchart which shows the flow of operation | movement of the application example of FIG. It is a block diagram which shows an example of the recording part of the measurement data in the conventional waveform recording device. It is operation | movement explanatory drawing in the acquisition memory 2 of FIG. It is another operation explanatory view in the acquisition memory 2 of FIG. It is another operation explanatory view in the acquisition memory 2 of FIG.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, and the same reference numerals are given to portions common to FIG. The difference between FIG. 1 and FIG. 6 is that an external recording control unit 7 and an external recording unit 8 are provided in FIG.

  In FIG. 1, the external recording control unit 7 reads measurement data for recording from the recording waveform memory 3 and records it in the external recording unit 8. The trigger / alarm information is also input from the trigger / alarm control unit 4 to the external recording control unit 7. As the external recording unit 8, for example, a large-capacity hard disk is used.

  FIG. 2 is a diagram for explaining the operation in the acquisition memory 2 of FIG. 1, and shows an example of the trigger mode. A predetermined number of points of measurement data D1 between the trigger point TP and the pre-trigger point T1 positioned before the trigger point TP, and between the trigger point TP and the post-trigger point T2 positioned after the trigger point TP The measurement data of the designated predetermined number represented by D = D1 + D2 that is obtained by combining the measurement data D2 of the designated predetermined number of points is read from the acquisition memory 2 after the measurement, and is recorded in the external recording unit 8 as a file every time a trigger occurs. can do.

  Here, the trigger conditions and the designated points of the measurement data D1 and D2 are set to desired values by the user before starting recording. At this time, the pre-trigger point T1 can be set to a longer time than the conventional one shown in FIG. 9, and the abnormal waveform Ssp of the measurement signal S generated after the pre-trigger point T1 can be recorded in the external recording unit 8 as a file. This is based on the provision of the external recording control unit 7 and the external recording unit 8 as described below.

  In FIG. 2, the acquisition memory 2 is shown as having a sufficient memory length, but actually, due to hardware limitations, the measurement data D1 of the specified number of points between the trigger point TP and the pre-trigger point T1. And the measurement data for the designated number of points D = D1 + D2 including the measurement data D2 for the designated number of points between the trigger point TP and the post-trigger point T2 is often longer than the memory length of the acquisition memory 2. Therefore, in FIG. 1, the measurement data D exceeding the capacity of the acquisition memory 2 can be recorded by using the acquisition memory 2 connected in a ring shape.

  FIG. 3 is a flowchart showing the operation flow of FIG. In FIG. 3, the file is opened by the recording start action by the operation of the measurement control unit 5 (step S1).

  The external recording control unit 7 checks whether or not recording data is generated in the recording waveform memory 3 (step S2).

  If the record data is generated, the measurement data is acquired (step S3), and the acquired measurement data is written in the external recording unit 8 (step S4).

  Steps S2 to S4 are repeated until the end of recording or a trigger is detected.

  Here, the acquisition memory 2 is connected in a ring shape to secure a storage area for holding the specified number of measurement data D1 between the trigger point TP and the pre-trigger point T1, and the latest pre-trigger data is written to the external recording unit 8. By holding, it is possible to record the measurement data D1 of any specified number of points between the trigger point TP and the pre-trigger point T1 as a temporary file of pre-trigger data.

  Subsequently, the trigger / alarm controller 4 checks whether or not a trigger is detected (step S5).

  When the trigger is detected, the external recording control unit 7 checks whether or not recording data is generated in the recording waveform memory 3 (step S6).

  If the record data is generated, the measurement data is acquired (step S7), and the acquired measurement data is written in the external recording unit 8 as a temporary file of post-trigger data (step S8).

  Steps S6 to S8 are repeated until the measurement data D2 having the designated number of points between the trigger point TP and the post-trigger point T2 is recorded.

  If no trigger is detected in step S5, it is confirmed whether or not recording has ended (step S9).

  When the recording is completed, a recording file is created using a temporary file of pre-trigger data written and held in the external recording unit 8. On the other hand, if the recording is not completed, the process returns to step S2, and the pretrigger data file written and held in the external recording unit 8 as a temporary file is updated by repeating steps S2 to S4.

  Thereafter, the external recording control unit 7 combines the temporary file of the pre-trigger data D1 written and held in the external recording unit 8 and the temporary file of the post-trigger data D2 to create a recording file D (step S10).

  Then, the file is closed (step S11), and a series of recording processes is terminated.

  FIG. 4 is an operation explanatory diagram focusing on the flow of measurement data in the flowchart of FIG.

  The pre-trigger data D1 of the recording data generated in the recording waveform memory 3 is written and held as a temporary file of the pre-trigger data by copying it to the external recording unit 8, and the post-trigger data D2 is also copied to the external recording unit 8 to post it. It is written and held as a temporary file of trigger data.

  The external recording control unit 7 copies the pre-trigger data D1 generated in the recording waveform memory 3 to the external recording unit 8 and writes and holds it as a temporary file of pre-trigger data, for example, pre-trigger data of the external recording unit 8 The storage area of D1 is used in a ring shape.

  The temporary file of the pre-trigger data D1 and the temporary file of the post-trigger data D2 written and held in the external recording unit 8 are combined to create a recording file D, and the temporary file of the pre-trigger data D1 and the post-trigger data D2 The temporary file is deleted.

  By configuring in this way, the latest pre-trigger data can be sequentially held as a temporary file in the external recording unit 8, and any number of data points exceeding the limit of the memory capacity of the acquisition memory 2 before and after the trigger (alarm) can be obtained. Recording becomes possible, and section recording of the portion of interest of the user can be realized.

  Thereby, in the long-time measurement, when an abnormal waveform is generated in the measurement signal, it is possible to smoothly analyze a wide section before and after.

  FIG. 5 is a flowchart showing the flow of the operation of the application example of FIG. 1, and the same step numbers are assigned to the parts common to FIG. In the flowchart of FIG. 5, steps S12 and S13 are inserted between steps S5 and S6.

  In step S12, when a trigger is detected in step S5, software analysis such as waveform parameter calculation is performed using the latest pretrigger data.

  In step S13, based on the analysis result in step S12, whether to record (GO) or not (NO-GO) is determined (GO / NO-GO determination).

  By performing software analysis using the latest pre-trigger data, for example, a file is recorded when the average value of pre-trigger data exceeds a certain set value (the logic of the trigger / alarm judgment result and GO / NO-GO judgment result) It is possible to realize section recording under more detailed conditions such as recording with product (AND).

  As described above, according to the present invention, it is possible to record a large amount of measurement data between arbitrary points before and after a trigger or an alarm, and to record waveform data including an abnormal signal to which the user is focused. It is possible to realize a waveform recording apparatus that can efficiently perform the analysis.

DESCRIPTION OF SYMBOLS 1 Measurement part 2 Acquisition memory 3 Recording waveform memory 4 Trigger / alarm control part 5 Measurement control part 6 Memory control part 7 External recording control part 8 External recording part

Claims (4)

In a waveform recording apparatus configured to capture an input signal converted into digital data into an acquisition memory as measurement data,
An external recording unit for storing waveform data for recording and an external recording control unit for controlling the recording operation of the waveform data to the external recording unit are provided,
A predetermined number of pre-trigger measurement data between the trigger point and the pre-trigger point located before the trigger point in the external recording unit, and a predetermined number of points between the trigger point and the post-trigger point located after the trigger point. The post-trigger measurement data is stored as a temporary recording file, and after the trigger is generated, the pre-trigger measurement data and the post-trigger measurement data are combined to record pre-trigger data exceeding the memory capacity of the acquisition memory. Waveform recording device.   2. The waveform recording apparatus according to claim 1, wherein the pre-trigger measurement data is recorded in the external recording unit in a ring shape.   3. The waveform recording apparatus according to claim 1, wherein when a trigger occurs, the latest pre-trigger measurement data is analyzed to determine whether recording is necessary.   4. The waveform recording apparatus according to claim 3, wherein as an analysis of the pre-trigger measurement data, an average value thereof is compared with a predetermined set value.

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