Measuring Instruments for the D.C. Resistance

JJG 2051-1990 DC resistance measuring instrument verification system JJG2051-1990 standard download decompression password: www.bzxz.net
This verification system is applicable to the verification procedures of DC resistance measuring instruments with a nominal resistance value of 10-4Ω~108Ω.

DC resistance measuring instrument verification system
JJG2051—1990
DC resistance measuring instrument verification system
Verification Scheme of Measuring Instruments far the DC Resistance lance
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IG 20511990
The verification system of DC resistance measuring instrument was approved by the Ministry of Industry and Information Technology on February 26, 1990, and will be implemented on January 1, 1991.
Drafting unit: China Academy of Computer Science and Technology The drafting unit of this article is responsible for the interpretation of the verification system. The main initiator of this verification system:
Yintianyuan
(China Academy of Materials Science)
Participating drafter:
Bicong Ni
China Academy of Materials Science》
Metrology reference instruments
Metrology standard instruments
Metrology standard instruments
Metrology standard instruments
Current resistance meter instrument verification system
DC resistance meter verification system
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This verification system is applicable to the control of direct current positive meter with a nominal resistance value of 1! This verification system stipulates the use of the national standard of current sub-unit (ohm), the complete set of basic metrology instruments including the standard, the basic parameters of the standard, and the transmission of the constant resistance value from the user to the standard through the metrology standard! The national resistance standard is a measuring instrument that is produced and preserved in my country and is a legal resistance unit, usually expressed as 2:1.2. The national resistance standard is a comparison device with a nominal value of 1. The annual variation of a single reference device in the national resistance standard group does not exceed .2. The total uncertainty of the comparison of the group is .11.3
2 The resistance sub-standard
is composed of a standard type and a sub-standard group and its comparison device. The nominal value is 16. The annual variation of a single sub-standard device does not exceed .2. The total uncertainty of the comparison of the group is (.15)3 Resistance comparison
The resistance comparison standard value is 15, which is used for international and domestic comparisons. The resistance unit 4 Resistance T-based
Resistance working standards are used as reference groups and comparison calibration groups: Resistance working standard groups include values ​​of 0-30, 1-7, 100.10, 100.0, 10:10.10509 standards, and the total uncertainty of each standard is .2~1)×1(3). Second-class metrological standard instruments
5 The metrological standard instruments are divided into first-class and second-class grades: the first-class resistance standards include 1020, 102%, 1!2, 10, 139, 10:10F2, 100, 1005 nominal values ​​and first-class resistance standard devices, and the second-class resistance standards include the above 9 nominal values ​​and resistance standard devices, as well as 10F and 100 corresponding devices. 5.1 Among the first-class resistance standards, the allowable annual variation of 10 is 1×10-6, and the total uncertainty of verification is 0.5×10-6; the allowable annual variation of 10, [2, 1, 103:10 is 310, and the total uncertainty of verification is 1.3×10-1020, 10-2, and 10°5 is 6×10, and the total uncertainty of verification is 3×10-%. 5.2 Among the second-class resistance standards, 10-0, 1 yuan, 10 0.10°, 100:100 annual change is 10×10-6, the total uncertainty of verification is 5×1-: 10-30, 10-22, 1052, 100 annual change is 20×10-%, the total uncertainty of pricing is 10×-3. The above uncertainties are 3, 10×10-6, and the nominal values ​​of the three working measuring instruments are ----,,,,
102,15,102,10013. Among them, 1 includes 9 accuracy levels: 0.00005, 0.001, 0.02, 0.005, 0.01, 0.02, 0.05, 0.1, and 0.2: 10-0, 10%, 44
.10, 10 includes every level except 0,00005; and 0-4, 0-5, -3:3, 10502051.1U, 1%Q include every level except 0.0005 and 0.09: The basic error limit, error limit and controlled uncertainty (3) of resistance working instruments determined according to their grade index are shown in Table 1.
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