Measuring Instruments for Vickershandness

JJG 2026-1989 Vickers Hardness Measuring Instrument Verification System JJG2026-1989 Standard Download Decompression Password: www.bzxz.net
This verification system is suitable for the verification of Vickers hardness measuring instruments with a test force of 49.03~980.7N and a measurement range of 5~1000HV. It specifies the procedure for transferring the Vickers hardness unit value from the HV standard to the working measuring instrument, and specifies the corresponding uncertainty and basic verification methods.

National Metrology Verification System of the People's Republic of China JJG2026--89
Vickers Hardness Measuring Instruments
Approved on September 11, 1989
Implementation on July 1, 1990
State Administration of Technical Supervision
Counting Standard Instruments
2. Counting Standard Instruments
3. Working Counting Instruments
4. Verification Scheme of Measuring insrumersforVicketHardness
JJG 2026-89
This national metrology verification system was approved by the State Technical Supervision Bureau on September 11, 1989 and came into effect on July 1, 1990.
For super-single units, the technical provisions of this verification system shall be checked and interpreted by the China Institute of Metrology. The main drafter of this verification system is Li Cun (China Institute of Metrology)
Manuscript (China Institute of Metrology)
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JJG2026-85
Total 2 pages Page 1
Vickers calibration system for measuring instruments
This calibration system is suitable for the calibration of hardness measuring instruments with a test force of 49.03920,7N and a full range of 5~100011V. It stipulates the use of the national basic metrological standard of Vickers unit HVK/mm, the standard of metrological data and the standard of working time, and indicates the corresponding period The accuracy and basic verification method of the national Vickers hardness standard.
1 National Vickers hardness standard
1.1 National hardness standard instrument, which is used to reproduce and preserve the Vickers hardness unit value chain, is the basis for unifying the national Vickers hardness value. 1.2 The national standard consists of a standard Vickers hardness machine and a standard indenter. 1.3 The range of the national standard Vickers hardness unit value is 5~1000HY.
1.4 The total accuracy of the national standard is 0.9% (3) 2 Vickers hardness working base
3.1 Working base reproduction and preservation (measurement) The range of the Vickers hardness unit value is 5--1 o HV.
2.2T is used as the total uncertainty of the benchmark for 1.3 (3). 2.3 In order to ensure the accuracy and consistency of the hardness test, the working benchmark must be compared with the national method regularly. The average value of the comparison is less than or equal to 1.2, and the total accuracy of the comparison is 10 points. The indication error of the working benchmark is allowed to be +0.9%. Three-dimensional measurement standard instrument
3-dimensional hardness measurement standard instrument
3.1 Group hardness measurement standard instrument is a standard hardness tester that meets the requirements of 2.2 after verification by the national benchmark or working base.
3.2 The dial constant range and uniformity of the standard hardness block are the same as the page z page
Secret spot port
>225--400H time| |tt||>400HV
3.3 Total uncertainty of standard block
hardness range
≤225HV
>225-400HV
>400HV
average thickness
JG2026-89
Total uncertainty
3.1%<)
2.8%（30）
Working metrology instruments
4 Group 4.1 Working Vickers hardness tester is a working Vickers hardness tester that has been calibrated to meet the requirements of 4.2 and 4.3. Its measuring range is 510004.2 Total uncertainty of working Vickers hardness tester
≤225 HV
225~400 HV
>400 HV
4,3 Working Vickers hardness tester tolerance
HV5,HV10,HV20
HV30,HV50,HV10
Total uncertainty
3.2% (3g)
Permissible error of indication
Framework of Vickers hardness measuring instrument calibration system
Framework of Vickers hardness measuring instrument calibration system Vickers national standard
Total uncertainty 0.9% (
is Vickers hardness working standard
5-1000HV
Total uncertainty
Permissible error of indication
Standard
Hardness HVWww.bzxZ.net
≤225
>225100
Average value
Total uncertainty (3)
Working Vickers principle
Naiqing Fanen HV
Hardness symbol
HVS.HVIO.HV20
HVO.HVSHVtOO
Total uncertainty (3)
Tolerance value tolerance
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