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JJF 1444-2014: Calibration Specification for D. C. Comparator Bridges for Measuring Temperatures
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Calibration Specification for D. C. Comparator Bridges for Measuring Temperatures
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JJF 1444-2014
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Basic data | Standard ID | JJF 1444-2014 (JJF1444-2014) | | Description (Translated English) | Calibration Specification for D. C. Comparator Bridges for Measuring Temperatures | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A55 | | Classification of International Standard | 17.220 | | Word Count Estimation | 27,289 | | Date of Issue | 1/23/2014 | | Date of Implementation | 4/23/2014 | | Regulation (derived from) | ?AQSIQ Announcement 2014 No. 10 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | | Summary | This Standard applies to the level of accuracy of 0. 0001, 0. 000 grade 2, grade 0. 000 5 0. 001 DC compare ceremony temperature bridge (or hereinafter referred to as the bridge) calibration. | JJF 1444-2014: Calibration Specification for D. C. Comparator Bridges for Measuring Temperatures
---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.
Calibration Specification for DCComparator Bridges for Measuring Temperatures
People's Republic of China National Metrology Technical Specifications
DC Comparator Bridge temperature calibration specification
Issued on. 2014-01-23
2014-04-23 implementation
The State Administration of Quality Supervision, Inspection and Quarantine released
DC Comparator
Temperature calibration bridge specification
eratures
Focal point. the National Technical Committee on Electromagnetic measurement
Main drafting unit. Jilin Institute of Metrology
Heilongjiang Provincial Institute of Metrology
On Highland Sting Instrument Research Institute
Participated in the drafting unit. Heilongjiang Electric Power Research Institute
This specification commissioned the National Technical Committee Electromagnetic responsible for the interpretation of measurement
The main drafters of this specification.
Wang Zhaohong (Jilin Institute of Metrology)
Wang Yong (Heilongjiang Institute of Metrology)
Qudi (Jilin Institute of Metrology)
Chen Wei (Jilin Institute of Metrology)
Lin Qi (on Highland Sting Instrument Research Institute)
Drafters participate.
Zhu Qing hair (on Highland Sting Instrument Research Institute)
Su Haitao (Heilongjiang Electric Power Research Institute)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2 Terms (1)
2.1 Sensitivity (1)
2.2 Drift (1)
3 Overview (1)
4 Metrological characteristics (1)
4.1 basic error (1)
4.2 ampere-turn balance sheet division value (2)
4.3 enclosing the galvanometer scale value (2)
4.4 magnetic potential balance error, the potential balance error and error ratio K (2)
4.5 primary operating current error (2)
4.6 turns ratio error (2)
4.7 overall verification (3)
Calibration Condition 5 (3)
5.1 calibration measurement standards (3)
5.2 Calibration reference conditions (3)
6 calibration items and calibration methods (3)
6.1 calibration items (3)
6.2 Calibration method (4)
Expression 7 Calibration results (9)
8 calibration interval (9)
Appendix A magnetic potential, the potential of error and composite error calculation table (10)
Appendix B plate transition between calculation table (11)
Appendix C Ⅰ disk linearity calculation table (12)
Appendix D Ⅱ ~ Ⅳ disc linearity calculation table (13)
Appendix E Ⅴ ~ Ⅶ disc linearity calculation table (14)
Appendix F Ⅰ primary disk 1 and showing the value of 1000 turns 1000 turns secondary comparison and verification of the overall calculation table (15)
Appendix G of the primary current accuracy of the calculation table (16)
Appendix H Calibration certificate-page format (p. 2) (17)
Appendix I calibration certificate calibration results page format (page 3) (18)
Appendix J Measurement Uncertainty Example (19)
Introduction
This specification based JJF 1071-2010 "National Calibration Specifications writing rules", JJF 1001 "universal metering
Terms and definitions ", JJF 1059.1" Evaluation and Expression of Uncertainty in Measurement "establishment.
The specification for the first time to develop.
DC Comparator Bridge temperature calibration specification
1 Scope
This standard applies to the level of accuracy of 0.0001, 0.0002, 0.0005, 0.001 DC
Comparator temperature bridge (or hereinafter referred to as bridge) calibration.
2 Terms
2.1 sensitivity sensitivity
Change measurement instrument response divided by the corresponding change in incentives.
2.2 Drift drift
Slow change measurement instrument metrological characteristics.
3 Overview
Comparator temperature bridge is a magnetic modulation type magnetic potential balance principle of high accuracy DC resistance (or temperature-based electricity
Resistance) ratio measuring instruments, measurement formula and it works with ordinary Comparator Bridge the same, that in magnetic potential and the potential
After equilibration, the ratio according to formula (1) calculation.
Rx
Rs =
Wx
Ws = K
(1)
Where.
Rx --- measured resistance;
Rs --- Standard resistance;
Wx --- bridge primary measurement variable winding plate;
Ws --- fixed secondary winding turns.
Rs is known to be used in Equation (2) calculation of the value of Rx.
Rx = WxWsRs = KRs
(2)
Adjustment comparator primary turns can be accurately adjusted constant current measured resistance ratio between the primary and secondary standard resistor so that
The two resistor voltage balance, the resistance ratio is equal to the turns ratio. Since the resistance temperature detector operating current smaller, more measured ceremony
Temperature bridge primary winding turns are usually designed for up to 10 times the secondary winding turns, to reduce measurement error. Comparator
Thermometry bridge has additional functions --- times the power to self-heating effect measurement standard platinum resistance; measuring current can be changed
To, in order to reduce the potential impact of the thermoelectric measuring circuit; an external recorder, you can record measurements for a long time and so on. It is applied
Precision measuring current 1mA ~ 20mA platinum resistance thermometers and other precision resistance thermometers.
4 Metrological characteristics
4.1 basic error
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