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JJG 484-2007 English PDF

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JJG 484-2007: Verification Regulation of D.C Bridges for Measuring Temperature
Status: Valid

JJG 484: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 484-2007English679 Add to Cart 5 days [Need to translate] Verification Regulation of D.C Bridges for Measuring Temperature Valid JJG 484-2007
JJG 484-1987English679 Add to Cart 5 days [Need to translate] Verification Regulation of the DC Bridges for Measuring Temperature Obsolete JJG 484-1987

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Basic data

Standard ID JJG 484-2007 (JJG484-2007)
Description (Translated English) Verification Regulation of D.C Bridges for Measuring Temperature
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A55
Classification of International Standard 17.220
Word Count Estimation 26,235
Date of Issue 2007-08-02
Date of Implementation 2008-02-02
Older Standard (superseded by this standard) JJG 484-1987
Quoted Standard AQSIQ Announcement No. 142 of 2007
Regulation (derived from) AQSIQ Announcement No. 142 of 2007
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine
Summary This standard applies to 0. 01 ~ 0. 05 DC resistance type temperature bridge initial verification, testing and use of follow-up inspection. This procedure does not apply to digital thermometer bridge, bridge DC Comparator temperature and other special-purpose temperature of the test bridge.

JJG 484-2007: Verification Regulation of D.C Bridges for Measuring Temperature

---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 DC Bridges for Measuring Temperature State verification procedures People's Republic of China Temperature DC bridge Posted 2007-08-02 2008-02-02 implementation The State Administration of Quality Supervision, Inspection and Quarantine released DC bridge temperature verification procedures erature Replacing JJG 484-1987 The regulations by the State Administration of Quality Supervision, Inspection and Quarantine, 2007 August 2 approved, and since 2008 Since February 2 implementation. Focal point. the National Technical Committee on Electromagnetic measurement Drafting unit. Henan Institute of Metrology The measurement procedure commissioned the National Technical Committee is responsible for interpreting electromagnetic The main drafters of this procedure. Liu Wenfang (Henan Institute of Metrology) Chenzhuan Ling (Henan Institute of Metrology) Drafters participate. Zhao Jun (Henan Institute of Metrology) Wang Zhuo (Henan Institute of Metrology) Der Yang (Henan Institute of Metrology)

table of Contents

1 Scope (1) 2. Referenced Documents (1) 3 Overview (1) 4 metering performance requirements (3) 5 General technical requirements (4) 5.1 Appearance and logo (4) 5.2 Insulation resistance (4) 5.3 Dielectric strength test (4) 5.4 Temperature bridge environmental requirements (4) 6 Control of measuring instruments (5) 6.1 Verification condition (5) 6.2 Temperature DC bridge test item (6) 6.3 Verification Methods (6) Processing 6.4 Verification Results (12) 6.5 test cycle (12) A test method for temperature measurement element method bridge appendix (13) Appendix B comparison test with the overall temperature Another way to bridge (17) Appendix C temperature DC power within Bridge Verification Certificate page format (20) DC bridge temperature verification procedures

1 Scope

The order applies to 0.01 ~ 0.05 DC resistance type (Smith) temperature measurement bridge (hereinafter referred to as the temperature of the bridge) The initial verification, subsequent verification and in-service inspection. This procedure does not apply to bridge the digital thermometer, temperature thermometer DC Comparator Bridge bridge and other special purpose of Verification.

2 Citations

The regulations cited in the following documents. JJF1059-1999 "Evaluation and Expression of Uncertainty in Measurement" GB 4793.1-1995 "measurement, control and laboratory use electrical equipment safety requirements" When using this procedure, it should pay attention to using the currently valid version of the documents cited.

3 Overview

Temperature bridge is coupled with standard platinum resistance thermometer to measure the temperature of precision instruments. It is a direct measurement of standard platinum resistance temperature Resistance value meter, after conversion to give an accurate temperature values, so as to achieve the purpose of temperature measurement. Temperature bridge Works circuit shown in Figure 1. It is a special double bridge structure, refers to the zero meter contacts and power connections Swap point position, improve the sensitivity of the line; in a consciously arm adds an R value, b arm Reducing a R value, so the formula is greatly simplified. Figure 1 Temperature bridge circuit diagram works

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