JJF 1170-2007 English PDF

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JJF 1170-2007: Calibration Specification for Cryogenic Resistance Thermometers with Negative Sensitivity
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1170-2007	499	Add to Cart	4 days	Calibration Specification for Cryogenic Resistance Thermometers with Negative Sensitivity	Valid

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Basic data

Standard ID: JJF 1170-2007 (JJF1170-2007)
Description (Translated English): Calibration Specification for Cryogenic Resistance Thermometers with Negative Sensitivity
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A54
Classification of International Standard: 17.200
Word Count Estimation: 19,135
Date of Issue: 2/28/2007
Date of Implementation: 2007-08-28
Older Standard (superseded by this standard): JJG 857-1994
Quoted Standard: JJG 350-1994; JJG 858-1994
Regulation (derived from): AQSIQ Announcement No. 41 of 2007
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to measuring range 1. 2K ~ 273. 16K low temperature resistance thermometer, thermistor temperature oxide glass thermometers and temperature carburization resistance thermometer. This specification does not specify what type the text of the thermometer, the following are referred thermometer.

JJF 1170-2007: Calibration Specification for Cryogenic Resistance Thermometers with Negative Sensitivity

---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 Cryogenic Resistance Thermometers with Negative Sensitivity National Metrology Technical Specification of the People's Republic Negative temperature coefficient low temperature resistance thermometer calibration specification Released on.2007-02-28 2007-08-28 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Negative temperature coefficient low temperature resistance thermometer Calibration specification Replace JJG857-1994 This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine on February 28,.2007, and Implemented on August 28,.2007. Focal Point. National Temperature Measurement Technical Committee Drafting unit. Institute of Physics and Chemistry, Chinese Academy of Sciences This specification is interpreted by the National Temperature Measurement Technical Committee. The main drafters of this specification. Lin Peng (Institute of Physical and Chemical Technology, Chinese Academy of Sciences) Participate in the drafters. Zhang Qinggeng (Institute of Physical and Chemical Technology, Chinese Academy of Sciences) Yu Lihong (Institute of Physical and Chemical Technology, Chinese Academy of Sciences)

table of Contents

1 Scope (1) 2 Citations (1) 3 Overview (1) 4 Measurement characteristics (1) 4.1 Basic information of the thermometer (1) 4.2 Thermometer stability (2) 4.3 Measuring current and self-heating effect of thermometer (2) 5 Calibration conditions (2) 5.1 Environmental conditions (2) 5.2 Standards and other equipment (2) 6 Calibration items and calibration methods (3) 6.1 aging experiment (3) 6.2 Visual inspection (3) 6.3 Indication calibration (3) 6.4 Calibration Data Processing (5) 7 Calibration result expression (6) 8 re-study interval (7) Appendix A Measurement Uncertainty Evaluation (8) Appendix B Calibration Certificate Fitting Data Page Format (Recommended) (13) Negative temperature coefficient low temperature resistance thermometer calibration specification

1 Scope

This specification applies to low temperature 锗 resistance thermometers with a measuring range of 1.2K~273.16K, low temperature oxide thermal Resistance thermometer and low temperature carburizing glass resistance thermometer. When the type of thermometer is not specified in the text of this specification, the following are referred to as thermometers.

2 Citations

JJG350-1994 "Standard casing platinum resistance thermometer verification procedures" JJG858-1994 "Standard ferritic resistance thermometer verification procedures" Use of this specification should be done with the current valid version of the above cited documents.

3 Overview

Low temperature resistance thermometer with negative temperature coefficient, including low temperature 锗 resistance thermometer, low temperature oxide thermistor temperature Metering and low-temperature carburizing glass resistance thermometers, etc., are measured according to the characteristics of the resistance of the semiconductor as a function of temperature. Temperature. The characteristics of these thermometers are that the resistance changes negatively with temperature, the sensitivity is high, and the temperature range is narrow. First, the interchangeability is not good, and a single multi-point calibration is required. Low temperature 锗 resistance thermometer, low temperature carburizing glass resistance thermometer and low temperature oxide thermistor thermometer, generally They are made into four leads, which are positive and negative current, positive and negative voltage leads, and are packaged in metal shell casing for heat transfer enhancement. If the casing is filled with a small amount of helium gas to reduce the effect of the self-heating effect of the thermometer. Low-temperature oxide thermistor thermometer, also available in two-lead, glass-encapsulated, four-lead method for calibration resistance. These thermometer calibration data are usually fitted with a Chebyshev polynomial for least squares fitting, and its resistance-temperature is off. There are four main types. T=a02 ∑ i=1 Aicos(icos-1x)=a02 ∑ i=1 Aicos[icos-1(AlnR B)] (1) T=a02 ∑ i=1 Aicos(icos-1x)=a02 ∑ i=1 Aicos{icos-1[Aln(lnR) B]} (2) lnT=a02 ∑ i=1 Aicos(icos-1x)=a02 ∑ i=1 Aicos[icos-1(AlnR B)] (3) T= A0 2 ∑ i=1 Aicos(icos-1x)=a02 ∑ i=1 Aicos[icos-1(AlnR B)] (4) In the formula, A and B are normalization constants, and it is guaranteed that the fitting coefficient is -1 ≤ x ≤ 1, ai for all calibration points. Most used The fitted form is equation (1). Depending on the situation, sometimes the fit of the calibration data needs to be segmented.

4 Measurement characteristics

4.1 Basic information of the thermometer ......

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