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JJG 125-2004 English PDF

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JJG 125-2004: Verification Regulation of D.C.Bridges
Status: Valid

JJG 125: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 125-2004English849 Add to Cart 6 days [Need to translate] Verification Regulation of D.C.Bridges Valid JJG 125-2004
JJG 125-1991EnglishRFQ ASK 3 days [Need to translate] (Frequency selection (broadband) level meter test procedures) Obsolete JJG 125-1991
JJG 125-1986EnglishRFQ ASK 9 days [Need to translate] DC bridges Obsolete JJG 125-1986
JJG 125-1976EnglishRFQ ASK 3 days [Need to translate] (Chinese Industry Standard) Obsolete JJG 125-1976

PDF similar to JJG 125-2004


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Basic data

Standard ID JJG 125-2004 (JJG125-2004)
Description (Translated English) Verification Regulation of D.C.Bridges
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A55
Classification of International Standard 17.220
Word Count Estimation 33,370
Date of Issue 2004-09-21
Date of Implementation 2005-03-21
Older Standard (superseded by this standard) JJG 125-1986
Quoted Standard JJF 1059-1999; JJF 1015-2002; GB 4793-1995; GB 3930-1983; IEC 60564-1997
Regulation (derived from) 2004 technical regulations issued by national metrology (industrial measurement 2005 Volume 15, Issue 1)
Issuing agency(ies) State Administration of Quality Supervision, Inspection and Quarantine
Summary This standard applies to the resistance measurement limit of less than 10 ^ 8��, the level of accuracy equal to or less than 0. 005 resistive type DC bridge (hereinafter referred to as the bridge) initial verification, testing and use of the follow-up inspection. This procedure does not apply to automatic test bridge, semi-bridge, current comparator bridge, digital bridge and other special-purpose bridge.

JJG 125-2004: Verification Regulation of D.C.Bridges

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Verification Regulation of DCBridges National Metrology Verification Regulations of the People's Republic DC bridge DCBridges Released on.2004-09-21 2005-03-21 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Replacing JJG 125-1986 This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 21,.2004, and It will take effect on March 21,.2005. Focal Point. National Electromagnetic Measurement Technical Committee Main drafting unit. Shanghai Institute of Metrology and Testing Technology Participated in the drafting unit. Shanghai Precision Scientific Instrument Co., Ltd. Shanghai Instrument and Meter Research Institute This procedure entrusts the National Electromagnetic Measurement Technical Committee to explain The main drafters of this procedure. Shi Xiaotao (Shanghai Institute of Metrology and Testing Technology) Sheng Junliang (Shanghai Institute of Metrology and Testing Technology) Xu Feng (Shanghai Institute of Metrology and Testing Technology) Participate in the drafters. Sang Shiming (Shanghai Precision Scientific Instrument Co., Ltd.) Zhang Yinfu (Shanghai Instrument and Meter Research Institute)

table of Contents

1 Scope (1) 2 Citations (1) 3 Terms and definitions (1) 4 Overview (2) 5 Metrological performance requirements (2) 5.1 Basic error (2) 5.2 Accuracy level (2) 5.3 The requirements for the zero instrument are included (2) 5.4 Influence of insulation resistance on overall error (3) 6 General technical requirements (3) 6.1 Appearance, nameplate and line inspection (3) 6.2 Insulation resistance (3) 6.3 Dielectric strength test (3) 7 Measuring instrument control (4) 7.1 Verification conditions (4) 7.2 Verification project (7) 7.3 Verification method (7) 7.4 Processing of verification results (14) 7.5 Verification cycle (15) Appendix A Measuring Bridge Resistance by Bridge Method (16) Appendix B Measuring bridge resistance by displacement method (17) Appendix C Measuring Resistance with Constant Current Source and Digital Voltmeter (19) Appendix D Measuring Resistance with Potentiometer (20) Appendix E Semi-overall verification and overall verification method for component verification bridge (22) Appendix F DC Bridge Calibration Original Record Format (23) Appendix G DC Bridge Verification Certificate Inner Page Format (25) Appendix H Format of the DC Bridge Verification Result Notice (27) DC bridge verification procedure

1 Scope

This procedure is applicable to resistors with an upper limit of resistance measurement less than 108 Ω and an accuracy level equal to or lower than 0.005. The first verification, subsequent verification and in-use inspection of the current bridge (hereinafter referred to as the bridge). This procedure does not apply to automatic bridges, semi-automatic bridges, current comparator bridges, digital bridges and other special applications. Verification of the way bridge.

2 Citations

This procedure refers to the following documents JJF1059-1999 "Measurement and Expression of Measurement Uncertainty" JJF1015-2002 "General specification for measuring instruments" GB 4793-1995 "Safety requirements for electrical equipment for measurement, control and laboratory" GB 3930-1983 "DC Bridge for Measuring Resistance" IEC 60564-1997 "Direct Current Bridge for Measuring Resistance" When using this procedure, care should be taken to use the current valid version of the above cited documents.

3 Terms and definitions

3.1 Resistive DC Bridge A combination of at least three resistive arms, plus a test resistor, forms a bridge network; when the bridge is in operation A DC power supply and a zero gauge are also required, which may or may not be attached. Each bridge is balanced when the bridge is balanced There is a computable relationship between the resistances of the devices. Note. The two-terminal bridge refers to the bridge used to measure the two-terminal resistor; the four-terminal bridge is used to measure the four-terminal resistor. Bridge. 3.2 Range Converter a transfer switch or similar device by which the effective range can be multiplied by a factor called "range factor" or The factor of "Range Magnification" (eg 0.1). 3.3 Effective range For a given range factor, the bridge can measure between the lowest and highest resistance values with the specified accuracy The range of resistance. 3.4 Total effective range The range of total resistance values that can be measured with the specified accuracy using all range factors. 3.5 scale display value The number of measuring discs after the bridge is balanced. When determining the resistance of the test resistor, multiply the range system if applicable number. 3.6 Measuring plate

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