JP4461483B2 - Multi-point measuring device - Google Patents

Description

  The present invention relates to a multi-point measuring device, and more specifically, a measurement time difference between measurement points in a multi-point measuring device configured to input measurement signals at a large number of measurement points to a common A / D converter via a scanner. It is related to the correction.

  Patent Document 1 discloses a configuration of a measurement recording apparatus that can remotely monitor measurement data trend recording results on recording paper.

JP 2004-186946 A

  In paragraphs 0012 and 0013 of Patent Document 1, in the multi-pen type recorder shown in FIG. 7 of Patent Document 1, each recording is performed so that the recording result on the recording paper does not appear to be affected by the recording position shift between the recording pens. The timing to input the measurement data for each recording pen drive system so that it is not necessary to consider the recording position deviation between recording pens when reading the recording results by matching the recording results with the pen on the time scale line of the recording paper. “Phase synchronization” is described in which the recording position is controlled by reflecting the feeding speed of the recording paper.

  This "phase synchronization" is a measurement point that occurs along the time axis direction in a multipoint measurement apparatus configured to input measurement signals at a large number of measurement points to a common A / D converter via a scanner. The point of correcting the measurement time difference between them is common to the present invention.

  FIG. 5 is a circuit diagram showing an example of a conventional multipoint measuring apparatus. In FIG. 5, the measurement signals of the measurement channels 1ch to 10ch corresponding to a large number of measurement points are respectively connected to the corresponding input terminals 2 of the scanner 1. The output terminal of the scanner 1 is connected to, for example, an integral A / D converter 4 via a programmable gain amplifier 3. The output terminal of the A / D converter 4 is connected to the data input terminal of the CPU 6 through the insulation circuit 5. Here, the programmable gain amplifier 3, the A / D converter 4 and the insulating circuit 5 constitute an analog input unit common to a large number of measurement channels 1ch to 10ch. The multipoint measuring apparatus is configured as a single measuring instrument or unitized as a measuring module that can be attached to and detached from the apparatus main body capable of measuring a plurality of channels.

  The multipoint measuring apparatus as shown in FIG. 5 is a single A / D converter 4 which is an expensive component in the case of a measurement application having a relatively long sample period, such as a recorder that measures and records a change trend of a measurement signal. Is widely used to reduce the cost of the measuring device.

  However, in such a multipoint measuring apparatus, focusing on the connection relationship between each of the measurement channels 1ch to 10ch and the A / D converter 4, since the scanner 1 is sequentially switched in time and connected, There is a time difference in channel measurement. As a result, even when exactly the same measurement signal waveform is input to each measurement channel, a phase difference / time difference corresponding to the scan period of the scanner 1 is generated as shown in FIG.

  In order to eliminate the phase difference / time difference between these measurement channels 1ch to 10ch, a sampling hold circuit is also added to the front stage of the scanner 1, but the cost of the added circuit is incurred. .

  The present invention solves these conventional problems, and its purpose is to measure a large number of measurement points, which can eliminate the phase difference / time difference between a plurality of measurement channels without adding a special circuit. An object of the present invention is to realize a multipoint measuring apparatus configured to input a signal to a common A / D converter via a scanner.

In order to achieve such a problem, the invention according to claim 1 of the present invention is:
In a multipoint measurement apparatus configured to input measurement signals of a large number of measurement points to a common A / D converter via a scanner,
A measurement time difference calculating means for obtaining a measurement time difference between each measurement point based on the scanner switching period;
Data storage means for storing these measurement time difference data as data independent of the measurement data;
Is provided.

The invention according to claim 2 is the multipoint measuring apparatus according to claim 1,
Synchronous display processing means for performing synchronous display processing on measurement data so that display waveforms of all measurement channels coincide on the time axis when the same waveform is input to each channel based on the stored measurement time difference data,
Is provided.

The invention according to claim 3 is the multipoint measuring apparatus according to claim 1,
Based on the stored measurement time difference data, measurement data synchronization processing means for performing a synchronization process on the measurement data so that the measurement data of all measurement channels coincide on the time axis,
Is provided.

The invention according to claim 4 is the multipoint measuring apparatus according to claim 1,
In a multipoint measurement apparatus configured to input measurement signals of a large number of measurement points to a common A / D converter via a scanner,
A measurement time difference calculating means for obtaining a measurement time difference between each measurement point based on the scanner switching period;
File creation means for filing these measurement time difference data as data independent of the measurement data,
Is provided.

The invention according to claim 5 is the multipoint measuring apparatus according to claim 4,
Based on the filed measurement time difference data, when the same waveform is input to each channel, a synchronized display process is performed on the measurement data filed so that the display waveforms of all measurement channels match on the time axis. Synchronous display processing means,
Is provided.

The invention according to claim 6 is the multipoint measuring apparatus according to claim 4,
Measurement data synchronization processing means for performing synchronization processing on the measurement data filed so that the measurement data of all measurement channels coincide on the time axis based on the measurement time difference data filed,
Is provided.

The invention according to claim 7 is the multipoint measuring apparatus according to any one of claims 1 to 6,
The multipoint measuring apparatus is configured as a measuring module.

  According to the present invention, the measurement data of all the measurement channels can be synchronized without using an additional circuit.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing parts related to the present invention, and parts common to FIG.
In FIG. 1, the CPU 6 includes a measurement time difference calculation unit 61, a synchronous display processing unit 62, a measurement data synchronization processing unit 63, a file creation unit 64, a normal display processing unit 65, and the like. A memory 7, a display 8, and an I / O interface 9 are connected. A memory 7 and an external storage device 10 are connected to the I / O interface 9.

  The memory 7 stores measurement data of a large number of measurement channels 1ch to 10ch, and stores time difference data D for a reference measurement channel (usually the first channel).

  These measurement data and time difference data D are also stored in the external storage device 10 via the I / O interface 9 as necessary, or are filed as necessary and stored in the memory 7 or the external storage device 10. Is done.

The measurement time difference calculation unit 61 of the CPU 6 becomes a reference based on the values of the time parameters K and A that change nonlinearly with respect to the change of the measurement cycle as shown in the time parameter table of FIG. 2 stored in the memory 7. The time difference data D of each measurement channel with respect to the measurement channel is obtained by equation (1).
D = A * (measurement channel number -1) + K (1)

  The time parameters K and A shown in FIG. 2 are determined by referring not only to the switching period of the scanner 2 but also to a measurement sequence comprising a combination of measurement of each measurement channel 1ch to 10ch and calibration of the A / D converter 4. It is different for each measurement module (for example, MLa to MLc). The reason why these time parameters K and A change non-linearly with respect to the change in the measurement period may be that the integration time and measurement sequence of the A / D converter 4 differ depending on the measurement period. For example, the integration time of the A / D converter 4 for each measurement channel is set to 2 msec at a high speed measurement period of 100 msec and set to 20 msec at a low speed measurement period of 1 sec. The measurement sequence consisting of the combination of the measurement of each measurement channel and the calibration of the A / D converter 4 performs 12 calibrations during the measurement of 10 channels at the measurement cycle of 500 msec, and the measurement of 10 channels at the measurement cycle of 1 second. It is set in advance to perform 16 calibrations.

The operation of the apparatus configured as shown in FIG. 1 will be described with reference to the flowchart of FIG.
The measurement data of each measurement channel can be displayed synchronously without being filed or displayed after being filed.

<When synchronously displaying measurement data as is>
(1) The measurement time difference calculation unit 61 of the CPU 6 calculates a time difference K corresponding to the currently set measurement cycle in order to calculate the time difference D of how much each other channel is delayed from the reference channel. And A are obtained from the table of FIG. 2 stored in the memory 7 (step SP1).

(2) The measurement time difference calculation unit 61 of the CPU 6 uses the time parameters K and A corresponding to the currently set measurement cycle obtained in (1) to determine how much each other channel is delayed from the reference channel. The time difference data D for each channel is stored in the memory 7 by performing the calculation of the above equation (1) for obtaining the time difference D. Here, if necessary, the time difference information is written in a file together with the measurement data (step SP2).

(3) When the same waveform is input to each channel based on the time difference data D of each channel stored in the memory 7, the synchronous display processing unit 62 of the CPU 6 displays the display 8 based on the measurement data of all the measurement channels. Synchronous display processing is performed to compensate each time difference D for the measurement data for each channel so that the display waveforms on the display screen coincide with each other on the time axis.

  Specifically, when displaying the measurement data of each channel, a delay time corresponding to each time difference data D is given so as to coincide with the time of the measurement data of the measurement channel having the largest time difference D. As a result, as shown in FIG. 4, the display 8 displays a waveform in which the time difference D between the channels is compensated (step SP3).

<When displaying measurement data as a file>
(1) The measurement time difference calculation unit 61 of the CPU 6 calculates a time difference D indicating how much each channel including the reference channel is delayed with respect to the reference time. The parameters K and A are obtained from the table of FIG. 2 stored in the memory 7 (step SP1).

(2) The measurement time difference calculation unit 61 of the CPU 6 uses the time parameters K and A corresponding to the currently set measurement cycle obtained in (1) to determine how much each other channel is delayed from the reference channel. The above equation (1) is calculated to obtain the time difference D. The file creation unit 64 of the CPU 6 writes the time difference data D of each channel obtained by the measurement time difference calculation unit 61 in the header of the data file for recording (step SP2).

(3) The CPU 6 reads the measurement data and time difference data D of each channel stored in the memory 7 (step SP4).

(4) The measurement data synchronization processing unit 63 of the CPU 6 performs synchronization processing on the measurement data based on the measurement data of each channel read from the memory 7 and the time difference data D (step SP5).

(5) The normal display processing unit 65 of the CPU 6 inputs the synchronized measurement data to the display 8 (step SP6).

(6) The display device 8 performs normal waveform display without performing synchronization processing for display (step SP7).

  Thereby, as shown in FIG. 4, when the same waveform is input to each channel, each display waveform on the display screen of the display 8 based on the measurement data of all measurement channels is matched on the time axis. A waveform in which the time difference D between the channels is compensated is displayed.

  Depending on the application, the display can be performed in consideration of the time difference without performing the synchronization process of the measurement data, as in the case of <synchronous display without changing the measurement data> in the previous section.

  Thus, by recording the conventional measurement data and the time difference between each channel separately, synchronized data display and conventional display can be performed according to the user's preference.

  As described above, according to the present invention, in a scan type multi-point measuring apparatus configured to input measurement signals at a large number of measurement points to a common A / D converter via a scanner, Temporal deviation of measurement data can be eliminated without adding a circuit.

It is a block diagram of the principal part which shows the part relevant to this invention. It is a time parameter table example figure. It is a flowchart explaining the operation | movement of FIG. It is a display waveform example figure based on this invention. It is a circuit diagram which shows an example of the conventional multipoint measuring apparatus. It is an example figure of the conventional display waveform.

Explanation of symbols

6 CPU
7 Memory 8 Display 9 I / O Interface 10 External Storage Device

Claims (7)

In a multipoint measurement apparatus configured to input measurement signals of a large number of measurement points to a common A / D converter via a scanner,
A measurement time difference calculating means for obtaining a measurement time difference between each measurement point based on the scanner switching period;
Data storage means for storing these measurement time difference data as data independent of the measurement data;
A multipoint measuring device characterized by comprising: Synchronous display processing means for performing synchronous display processing on measurement data so that display waveforms of all measurement channels coincide on the time axis when the same waveform is input to each channel based on the stored measurement time difference data,
The multipoint measuring apparatus according to claim 1, wherein: Based on the stored measurement time difference data, measurement data synchronization processing means for performing a synchronization process on the measurement data so that the measurement data of all measurement channels coincide on the time axis,
The multipoint measuring apparatus according to claim 1, wherein: In a multipoint measurement apparatus configured to input measurement signals of a large number of measurement points to a common A / D converter via a scanner,
A measurement time difference calculating means for obtaining a measurement time difference between each measurement point based on the scanner switching period;
File creation means for filing these measurement time difference data as data independent of the measurement data,
A multipoint measuring device characterized by comprising: Based on the filed measurement time difference data, when the same waveform is input to each channel, a synchronized display process is performed on the measurement data filed so that the display waveforms of all measurement channels match on the time axis. Synchronous display processing means,
The multipoint measuring apparatus according to claim 4, wherein the multipoint measuring apparatus is provided. Measurement data synchronization processing means for performing synchronization processing on the measurement data filed so that the measurement data of all measurement channels coincide on the time axis based on the measurement time difference data filed,
The multipoint measuring apparatus according to claim 4, wherein the multipoint measuring apparatus is provided. The multipoint measuring apparatus according to any one of claims 1 to 6, wherein the multipoint measuring apparatus is configured as a measurement module.

Images