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Apparatus for integrality checking proportion of cryo-current comparator and the method thereof

A current comparator, low temperature technology, applied in the direction of instrument, reference value comparison, current/voltage measurement, etc., can solve problems such as difficult calibration

Inactive Publication Date: 2007-05-16
NAT INST OF METROLOGY CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the low-temperature current comparator is the most accurate DC proportional measuring tool at present, it is very difficult to verify its proportional value experimentally with other measuring tools

Method used

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  • Apparatus for integrality checking proportion of cryo-current comparator and the method thereof
  • Apparatus for integrality checking proportion of cryo-current comparator and the method thereof
  • Apparatus for integrality checking proportion of cryo-current comparator and the method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Figure 4 is the experimental data of the overall calibration of the low temperature current comparator CCC3 according to the method shown in Figure 2. The number of turns of the two proportional windings of the low temperature current comparator is 512. Since the current directions in the two windings are opposite, the actual ratio is -512 / 512. -512 / 512 is the limit situation that the inventor's research group can achieve when performing overall calibration. such as W 1 and W 2 Exceeding 512, the slave current source in Fig. 1 may appear current jump phenomenon. It should be noted that in articles published abroad, W 2 Generally only 16 turns, in some cases 31 turns are useful. W 2 No matter how big it is, the current jump phenomenon will appear. Since the inventor has better solved the difficulty that the operating current will jump when the number of ampere turns is large, the overall calibration is performed under the turns ratio of -512 / 512. It can be seen f...

Embodiment 2

[0054] 16133 / 125 is the turn ratio used by the inventor when comparing the quantized Hall resistance with 100Ω. The data in Figure 5 shows the actual measurement data for the overall calibration of CCC3 when the number of ampere turns is the same as this. The low temperature current The number of turns of the two proportional windings of the comparator is 125. The type A uncertainty of the 52 sets of data is 1.9×10 -10 (k=1), no systematic deviations were seen in the proportional values ​​across the range of data scatter. Compared with the data in Figure 4, due to the smaller number of ampere-turns, the data dispersion is correspondingly larger.

Embodiment 3

[0056] When the inventor uses CCC3 to compare the quantized Hall resistance with 100Ω, sometimes he also adopts the turns ratio of -10067 / 78. The data in the accompanying drawing 6 shows the actual measurement data of the overall calibration when the number of ampere turns is the same. The number of turns of the two proportional windings of the cryogenic current comparator is 78. The type A uncertainty of the 52 sets of data is 3.3×10 -10 (k=1), no systematic deviations were seen in the proportional values ​​across the range of data scatter. Compared with the data in Figure 5, because the ampere-turns are much smaller, the data dispersion becomes larger.

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Abstract

This invention relates to one meter device and its method and especially to one integral test device and method of low temperature current comparer device, wherein, the said test device comprises two sets of coils to be tested and the two sets coils are same and different polarization; it comprises main current source and passive current source, zero device and non-balance magnetic tester SQUID. This invention can test whole test in real time work status of the current comparer uncertain proportion.

Description

Technical field: [0001] The invention belongs to a measuring instrument and its method in the measuring process, in particular to an integral calibration device and its method of a low-temperature current comparator in electrical measuring. Background technique: [0002] The measurement process refers to comparing the measured quantity with the standard quantity and obtaining the ratio between the two. Therefore, the standard quantity, the measurand and the proportional gauge are the three elements to complete the measurement process. Among them, whether the ratio value given by the ratio measuring tool is accurate is naturally extremely important for the measurement process. Continuously improving the accuracy of proportional measuring tools has become a persistent pursuit of metrologists in various countries. In electrical measurement, the historic Wheatstone bridge and potentiometer are the two most well-known proportional measuring tools. The accuracy of its ratio is ...

Claims

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Application Information

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IPC IPC(8): G01R35/00G01R17/00G01R15/00G01R19/00G01R27/02G01R33/07
Inventor 李正坤张钟华贺青
Owner NAT INST OF METROLOGY CHINA
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