JPH06201399A - Standard signal correcting device - Google Patents

Abstract

PURPOSE:To automatically correct a standard signal on the basis of calibration data, and provide the more precise standard signal. CONSTITUTION:The data of an error DELTACB which is the calibration result of a standard B when a standard signal S0 was outputted from a high level standard to the standard B in the past is historically registered in a file device 11. When a standard signal S1 is outputted from the standard B to an electronic apparatus A, a correction arithmetic part 14 calculates a correction value alphaon the basis of a standard signal set value (i) set in the standard B and the error DELTACB. A signal arithmetic part 14 calculates a standard signal S1' having a value closer to the true value on the basis of the standard signal set value (i) and the correction value alpha, a correction processing part 16 sets the standard signal S1' after the correction in the standard signal generating part 10 of the standard B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a standard device for outputting a reference signal required for calibration of various electronic devices to the electronic device, and a reference signal correction device for correcting the reference signal output by the standard device. Regarding

[0002]

2. Description of the Related Art Electronic devices that measure and display various measured quantities (analog information) are regularly measured at regular intervals, such as every six months or every other year, in order to maintain high accuracy. It is necessary to calibrate. Here, "calibration" is a series of operations for confirming the relationship between a value indicated by an instrument or a measurement system and a corresponding known value under specific conditions.

An electronic device to be calibrated is denoted by A, and a standard device (the relevant standard device) which is a highly accurate and high-level electronic device is denoted by B. Electronic device A to be calibrated from the standard device B
To the reference signal S ₁ . The electronic device A that has received this reference signal S ₁ as the measurement target is
Measure ₁ and display some value. The standard device B
A signal having a known value is used as the reference signal S ₁ output from the device, the signal is regarded as a true value, and the relationship with the value displayed by the electronic device A is examined. This is calibration. If necessary, a history is recorded as calibration data, or the electronic device A is adjusted so that the value displayed by the electronic device A becomes closer to the true value.

The standard device B that outputs the reference signal S ₁ for calibration is also an electronic device. In order to maintain the accuracy of the reference signal S _1, the standard device B is also calibrated periodically by a standard device (higher standard device) C as a higher national standard or an international standard. That is, the standard device B that outputs the reference signal S ₁ to the electronic device A is replaced by a high-precision standard device C (for example, public institutions JMI, JEM).
By regularly calibrating with IC standard device),
The accuracy of the reference signal S ₁ output by the standard B is clearly understood. The reference signal S ₀ output from the high-order standard device C to the standard device B and the corresponding reference signal S ₁ of the standard device B are compared to obtain the error Δ _CB .

If the calculated error Δ _CB is within the tolerance range of the standard device B, the standard device B is not adjusted,
The proofreading data is kept in the history file. If the error Δ _CB is within the range of the tolerance, when the electronic device A is subsequently calibrated, the original reference signal S ₁ remains unchanged.
Is output to the electronic device A.

That is, the standard B that outputs the reference signal S ₁ is calibrated using the high-level standard C, and the difference between the reference signal S ₀ of the high-level standard C and the reference signal S ₁ of the standard B is calculated. Although the error Δ _CB is known, if the error Δ _CB is within the tolerance of the standard device B, the error Δ _CB may be ignored and the standard device B should be adjusted. In reality, the current value of the reference signal S ₁ is regarded as a true value and is output to the electronic device A to be calibrated.

[0007]

[Problems to be Solved by the Invention] However, originally,
The reference signal S ₁ used for calibration should use a value closer to the true value. The inventor considers that the error Δ _CB known in the calibration of the standard B using the high standard C should be corrected in principle, even if it is small.

If the original purpose of calibrating the electronic device A using the standard B is to improve the accuracy of the electronic device A, the correction is made despite the error Δ _CB. Calibrating the electronic device A by using the standard device B that outputs the reference signal S ₁ that is not performed as it is will lack rigor in the true sense. It is hard to say that the measurement result by such an electronic device A is sufficiently high in reliability.

Further, the reference signal S output from the standard B is output.
_{The value 1} drifts and changes with time, and the error Δ _CB obtained as a result of calibration is different each time calibration is performed. If the error Δ _CB obtained by the calibration exceeds the tolerance range, the standard device B is adjusted to correct the reference signal S ₁ to a value closer to the true value.

However, once the standard B is adjusted, the value of the reference signal S ₁ output before the adjustment becomes unclear, and the electronic device A calibrated using the reference signal S ₁ before the adjustment. The measured data obtained by the experiment and the like and the measured data by the same electronic device A calibrated using the adjusted reference signal S ₁ naturally have different values. The correlation between them becomes unclear.

That is, even if the standard device B is adjusted to bring the value of the reference signal S ₁ closer to the true value, the displayed value of the standard device B does not change, and the amount of the reference signal S ₁ is changed. Is changed, the state of the electronic device A calibrated using the changed reference signal S ₁ is changed, and as a result, the reliability of the previously measured data is deteriorated. It was

The present invention was devised in view of such circumstances, and aims to solve the problem relating to the reference signal output by the standard device, and based on the calibration data obtained by calibrating the reference signal, the reference signal is calibrated. It improves the reliability of the reference signal more than ever, such as by correcting and converting it to a more accurate reference signal and reproducing the reference signal used in the past,
An object of the present invention is to provide a reference signal correction device capable of highly reliable calibration.

[0013]

A first reference signal correction device according to the present invention is a device for outputting the reference signal to correct the reference signal from the standard device for calibrating an electronic device. A reference signal calibration history data file device that pre-registers the error that is the calibration result of the standard device when the reference signal is output from the high-level standard device to the standard device, the reference signal, and the corresponding A correction calculation unit that calculates a correction value based on the error of the calibration history data read from the file device, and a signal calculation that calculates a value of the reference signal closer to the true value based on the reference signal and the correction value. And a correction processing unit for outputting the corrected reference signal from the standard device.

A second reference signal correction apparatus according to the present invention is based on the first reference signal correction apparatus described above, and means for reading out an error at an arbitrary past time from the file device, and the past error. And a means for calculating, reproducing and outputting the value of the reference signal at that time.

[0015]

According to the first reference signal correction device, an error which is a calibration result of the high-order standard device in the past with respect to the standard device is registered in the file device, and when the reference signal is output from the standard device, the error is registered. The error corresponding to the reference signal is read out from the file device, automatically corrected to a reference signal having a value closer to the true value, and output.

According to the second reference signal correction apparatus,
It is possible to reproduce the reference signal at any time in the past at any time.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a reference signal correction device according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the functional configuration of the reference signal correction apparatus. In the figure, A is an electronic device that measures and displays some physical quantity, and this electronic device A is calibrated by the standard device B periodically. Its calibration, and outputs the reference signals S ₁ analog from the standard device B, the electronic device A entered the reference signal S ₁ is displayed a display value based on the reference signals S _1,
The purpose is to compare the value of the reference signal S ₁ with the display value and confirm the error. The standard B has a reference signal generator 10 as a main element. Since the standard B used for the calibration of the electronic device A needs to be maintained with high accuracy, it is necessary to perform regular calibration for every fixed period such as half a year or one year.

The calibration of the standard device B is requested to a reliable public institution and is performed in comparison with the national standard of the higher-order standard device C of higher accuracy. As a result of the calibration, it is possible to grasp how accurate the current state of the standard device B, which is constantly changing due to changes over time, is. That is, it is confirmed how much the value of the reference signal S ₁ set and output by the standard device B has an error compared with the reference signal S ₀ of the higher standard device C. Although it is ideal that the reference signal S ₁ has a true value, it is impossible in practice. It is desirable to bring the value closer to the true value by bringing it closer to the value of the reference signal S ₀ of the higher standard device C as much as possible. Therefore, based on the results obtained by the calibration to correct the reference signals S ₁ output by setting of the standards B, and taken as the reference signals S ₁ of value closer true value.

Conventionally, the calibration result obtained by requesting calibration from a public institution was only visually checked to determine whether or not the accuracy of the standard device B could be used. The reference signal S ₁ used was used as it was. In this case, the reliability of the measurement data obtained by the electronic device A calibrated with the reference signal S ₁ remains low.

Therefore, in order to correct the reference signal S ₁ to a value closer to the true value, the following configuration is adopted.

First, the reference signal calibration history data file device 11 is provided. This reference signal calibration history data file device 11 is a result of comparison with a national standard by a public institution, that is, the value of the reference signal S ₁ output at the value set in the standard B, and a higher-accuracy high-order value. The value of the national standard reference signal S ₀ output from the standard C,
The error Δ _CB , which is the difference between the two, is registered as reference signal calibration history data. The reference signal calibration history data file device 11 receives the reference signal S from the standard B.
_The search is performed by the set value i when ₁ is output, and the data of the error Δ _CB is output as the corresponding calibration history data.

Regarding the registration of the calibration history data, it is assumed that the calibration results, which are regularly carried out every six months or one year, are sequentially registered so that the past data can always be recalled. This is, in the case of performing the correction by calling the calibration history data, even in the time of the reference signal S _1, also, even if the reference signal S _1, which was used many years ago, so that can be reproduced retroactively to freedom This is because The aim of reproducing in this way is to compare the experimental data measured in the past by the electronic device A with the experimental data measured under the same condition by the same electronic device A at present, and to match them with a certain relationship. This is because

In the past, since the reference signal S ₁ used when the electronic device A was calibrated differs from time to time, the state itself of the electronic device A naturally changes, and measurement is performed using the electronic device A. The current data will also change. Until now, it was known that such a situation existed, but it was thought that there was nothing that could be done due to the change over time.

Reference signal calibration history data file device 11
As an example of registration of the calibration history data in, the following can be listed. The registration format is free.

Standard instrument calibration date: October 1992 Returning to FIG. 1, in the standard device B, the reference signal generator 1
A first storage unit 12 is provided for storing a value set to output the reference signal S ₁ from 0 as the reference signal set value i. Further, a second storage unit 13 for storing the data of the error Δ _CB retrieved by searching the reference signal calibration history data file device 11 by the reference signal set value i is provided. Further, the correction calculation unit 14, the signal calculation unit 15,
The correction processing unit 16 is provided.

The correction calculation unit 14 reads the reference signal set value i from the first storage unit 12 and the error Δ _CB from the second storage unit 13, and based on them, the reference signal set value i.
The correction value α corresponding to the reference signal S ₁ is calculated and sent to the signal calculator 15. The signal calculation unit 15 is
The reference signal setting value i is read from the first storage unit 12, the correction value α is input from the correction calculating unit 14, and the reference signal corresponding to the reference signal setting value i is input based on these two values (i, α). An accurate value of the reference signal S ₁ ′ that is a value closer to the true value with respect to S ₁ is calculated. Correction processing unit 1
Reference numeral 6 denotes a reference signal generator 10 in the standard device B in order to output the corrected reference signal S ₁ ′ from the standard device B.
The reference signal setting value of is corrected from i to i ′.
The correction command to the reference signal generator 10 is issued via an interface such as GP-IB. Based on the new setting of the reference signal setting value i ′, the reference signal S ₁ ′ having a value closer to the true value is sent from the standard device B to the electronic device A.
Will be output to.

The reference signal calibration history data file device 11, the first storage unit 12, the second storage unit 13, the correction calculation unit 14, the signal calculation unit 15, and the correction processing unit 16 are used to correct the reference signal according to the present invention. The device X is configured.

That is, the corrected reference signal S ₁ ′ obtained based on the reference signal setting value i and the correction value α is the correction value α.
Is calculated in consideration of the error Δ _CB between the standard device B and the higher standard device C registered in the reference signal calibration history data file device 11, and thus the true value is accurately obtained. It means that the reference signal is corrected to a value closer to. Moreover, the operator only sets the reference signal set value i in order to output the reference signal S ₁ .
After that, the reference signal correction device X concerned automatically performs the arithmetic processing to determine the corrected reference signal set value i ', and based on that, the corrected reference signal S having a value closer to the true value is obtained.
₁ 'so that the output to the electronic device A.

FIG. 2 is a block diagram when the computer automatically corrects the reference signal.

The computer 20 comprises an arithmetic unit 21 and an internal memory 22. The calculation unit 21 includes the correction calculation unit 14, the signal calculation unit 15, and the correction processing unit 16 in FIG. The internal memory 22 is the first storage unit 12 in FIG.
And a second storage unit 13.

Reference numeral 23 is a reference signal calibration history data file device, 24 is a standard instrument group consisting of a plurality of relevant standard instruments B ₁ , B ₂ , B ₃ , A is an electronic device to be calibrated, S ₁ , S ₂ ,
S ₃ is a reference signal individually output from each of the standard devices B ₁ , B ₂ , and B ₃ to the electronic device A, and 25 is a GP-IB (General) connecting the computer 20 and the standard device group 24.
Purpose Interface Bus) and other interfaces.

The computer 20 uses the standard devices B ₁ and B ₁ .
₂ or B ₃ is designated, and _one of the reference signals S ₁ , S ₂ and S ₃ for the electronic device A is selected and output.
The computer 20 reads the calibration history data from the file device 23 according to the internal program, and transfers and stores the calibration history data in the internal memory 22. Then, the reference signal S _j (j is 1, 2 or 3) being output by the arithmetic unit 21.
, The reference signal S _j ′ having a value closer to the true value is corrected based on the calibration history data, and the corrected reference signal S _j ′ is output from the standard device B _j to the electronic device A. Correct the setting of standard device B _j .

A specific operation will be described with reference to the flowchart of FIG. In step n1, any kind of reference signal S _j required for calibration of the electronic device A is selected, and in step n2, the reference signal S _j (j is 1, 2 or 3).
_Is connected to the electronic device A. At step n3, the value of the reference signal S _j to be input to the electronic device A is set. In step n4, it is selected whether to output the set value as it is or to perform the correction according to the present invention as in the conventional method. That is, it is determined whether the calibration history data is required. If calibration history data is not required, skip to step n14 and set the reference signal S
_{The j} is output to the electronic device A as it is.

However, when the calibration history data is required, the process proceeds to step n5 to open the file in the file device 23, and in step n6 the error Δ from the file device 23 is determined according to the type and set value of the reference signal S _{j. CB}
Read the data. Then, in step n7,
The correction value α is calculated based on the read data of the error Δ _CB , and in step n8, the reference signal S _j ′ having a value closer to the true value is calculated based on the correction value α. Then, in step n9, the value of the reference signal S _j initially set is compared with the value of the reference signal S _j ′ obtained by the calculation. Determine whether If there is a slight difference that does not require correction, the process proceeds to step n14, where the initially set reference signal S _j is considered to be closer to the true value, and the reference signal S _j is output to the electronic device A. .

When it is determined that the correction needs to be performed, the process proceeds to step n11 to perform the correction process. That is, the setting of the standard device B _j is modified so as to output the corrected reference signal S _j ′. Then, in step n12, the value of the actual corrected reference signal S _j ′ is compared with a value closer to the true value, and it is determined in step n13 whether the comparison results match. If they do not match, the process returns to step n11 to repeat the correction process until they match, and if they match, the process proceeds to step n14 to output to the electronic device A as the finally determined corrected reference signal S _j ′.

[0036] As described above, when the output of the reference signal S _j from the standard device B _j is always the correction and outputs the reference signal S _j 'with a value close to the true value by automatically, As the reference signal necessary for the calibration of the electronic device A, a reference signal very close to a true value as accurate as a national standard can be used. Therefore, the accuracy of the data measured by the electronic device A calibrated and corrected with such a reference signal is extremely high. The reference signal correction apparatus X according to the present invention is very useful in improving the reliability of experimental data and can be widely used.

If, in step n6, the error data at any past time is read for each year,
The reference signal used for calibration at that time can be calculated. That is, it is possible to confirm what the past measurement data was like by reproducing the correct reference signal value at an arbitrary time in the past and correcting it whenever necessary.

[0038]

According to the first reference signal correction device of the present invention, when the reference signal is output from the standard device, the reference signal is automatically corrected to a value closer to the true value. Since it is configured, it is possible to always use a highly reliable reference signal when calibrating an electronic device without being affected by aging of the standard device.
The accuracy of the measurement data by the electronic device can be improved. Further, since the correction is automatically performed, it is possible to eliminate the conventional laborious adjustment of the standard device due to human work.

Further, according to the second reference signal correction apparatus of the present invention, by reproducing the reference signal at an arbitrary time in the past, the relationship between the present measurement data and the past measurement data and the past It is possible to clarify the correlation between measurement data of multiple periods.

[Brief description of drawings]

FIG. 1 is a block diagram showing a functional configuration of a reference signal correction apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of an embodiment when a computer automatically corrects a reference signal in the present invention.

FIG. 3 is a flowchart for explaining the operation of the embodiment.

[Explanation of symbols]

A ...... electronic _{device, B, B 1, B 2} , B 3 ...... the standards, X ...... reference signal correcting device, the reference signal from _{S 1, S 2, S 3} ...... the standards, S ₁ ′, S _j ′ ... reference signal after correction, S ₀ …… reference signal from the high-level standard, i ……
Reference signal set value, i '... Reference signal set value after correction, Δ
_CB: error, α: correction value, 10: reference signal generator,
11 ... Reference signal calibration history data file device, 12 ...
... first storage unit, 13 ... second storage unit, 14 ... correction calculation unit, 15 ... signal calculation unit, 16 ... correction processing unit, 2
0 ... Computer, 21 ... Calculation unit, 22 ... Internal memory, 23 ... Reference signal calibration history data file device,
24: Standard group, 25: Interface (GP-
IB)

Claims (2)

[Claims] 1. An apparatus for correcting a reference signal from a standard device for outputting a reference signal to calibrate an electronic device, wherein the reference signal is output from a high-level standard device to the standard device. A reference signal calibration history data file device in which an error, which is the calibration result of the standard device, is registered in advance, and a correction value is calculated based on the reference signal and the error in the calibration history data read from the file device corresponding to the reference signal. A correction calculation unit that calculates, a signal calculation unit that calculates a value of the reference signal closer to a true value based on the reference signal and the correction value,
A reference signal correction apparatus comprising: a correction processing unit that outputs the corrected reference signal from the standard device. 2. The reference signal correction device according to claim 1, wherein a means for reading an error at an arbitrary past time from the file device, and a value of the reference signal at that time are calculated and reproduced based on the past error. And a means for outputting as a reference signal.