Search result: JJF 1076-2020 (JJF 1076-2001 Older version)
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| JJF 1076-2020 | English | 419 |
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Calibration Specification for Digital Temperature-hygrometers
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JJF 1076-2020
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| JJF 1076-2001 | English | 519 |
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Calibration Specification of Humidity Sensors
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JJF 1076-2001
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| Standard ID | JJF 1076-2020 (JJF1076-2020) | | Description (Translated English) | Calibration Specification for Digital Temperature-hygrometers | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A61 | | Classification of International Standard | 17.200 | | Word Count Estimation | 18,188 | | Date of Issue | 2020-11-26 | | Date of Implementation | 2021-05-26 | | Older Standard (superseded by this standard) | JJF 1076-2001 | | Regulation (derived from) | Announcement No. 57 (2020) of the State Administration for Market Regulation | | Issuing agency(ies) | State Administration for Market Regulation | | Summary | This standard applies to the calibration of electrical parameter digital thermometers and hygrometers, temperature and humidity sensors, temperature and humidity transmitters, temperature and humidity inspection instruments, temperature and humidity recorders, temperature and humidity memory, etc. Thermohygrometers of other principles can also be implemented by reference. |
JJF 1076-2020
Calibration Specification for Digital Temperature-hygrometers
National Metrology Technical Specifications of the People's Republic of China
Calibration specification for digital thermometer and hygrometer
2020-11-26 release
2021-05-26 implementation
Issued by the State Administration for Market Regulation
Calibration specification for digital thermometer and hygrometer
Replace JJF 1076-2001
Focal point: National Technical Committee of Physical and Chemical Metrology
Main drafting unit: China Institute of Metrology
Liaoning Institute of Metrology
China Testing Technology Research Institute
Participated in the drafting: Jinan Changfeng Guozheng Technology Development Co:, Ltd:
This specification entrusts the National Technical Committee of Physical Chemistry Metrology to interpret
The main drafters of this specification:
Li Zhanyuan (China Institute of Metrology)
Guandi (Liaoning Institute of Metrology)
Zhang Wen (China Testing Technology Research Institute)
Participating drafters:
Yi Hong (China Institute of Metrology)
Yang Ju (China Institute of Metrology)
Zhang Jiong (Jinan Changfeng Guozheng Technology Development Co:, Ltd:)
table of Contents
Introduction (Ⅱ)
1 scope (1)
2 Overview (1)
3 Measurement characteristics (1)
3:1 Correction value of thermometer and hygrometer (1)
3:2 Humidity stability of thermometer and hygrometer (1)
4 Calibration conditions (1)
4:1 Environmental conditions (1)
4:2 Measurement standards and other equipment (1)
5 Calibration items and calibration methods (1)
5:1 Installation of calibration equipment (1)
5:2 Correction value of thermometer and hygrometer (1)
5:3 Humidity stability of thermometer and hygrometer (2)
6 Expression of calibration results (2)
7 Re-calibration interval (3)
Appendix A Original Record Format of Thermohygrometer Calibration (4)
Appendix B: Internal page format of calibration certificate (6)
Appendix C Examples of Uncertainty Evaluation of Calibration Results of Digital Thermohygrometer (8)
introduction
This specification is compiled in accordance with the requirements of JJF 1071-2010 "Rules for Compiling National Metrology and Calibration Specifications": digital
Part of the measurement performance and calibration methods of the type thermometer and hygrometer refer to the "Humidity" of the British National Physical Laboratory (NPL)
"Measurement method guide" (AGuidetotheMeasurementofHumidity) in the requirements:
Compared with JJF 1076-2001, in addition to editorial changes, the main technical changes of this specification are as follows:
---Added the technical requirements and calibration methods for temperature calibration of thermometers and hygrometers (see 5:2);
---Clarified that the temperature and humidity standard box can be used as a humidity generator to calibrate a thermometer and hygrometer (see 4:2:3);
--- Deleted the temperature coefficient, response time and hysteresis characteristics of the thermometer and hygrometer;
---Added an example of uncertainty evaluation (see Appendix C):
The previous releases of this specification are as follows:
---JJF 1076-2001:
Calibration specification for digital thermometer and hygrometer
1 Scope
This specification applies to electrical parameter digital thermometers and hygrometers, temperature and humidity sensors, temperature and humidity transmitters, temperature and humidity monitoring
Calibration of instrument, temperature and humidity recorder, temperature and humidity memory, etc: Thermohygrometers of other principles can also be implemented by reference:
2 overview
A digital thermometer and hygrometer (hereinafter referred to as a thermometer and hygrometer) is composed of temperature measuring components, humidity sensitive components and circuits:
Thermohygrometer that can directly display temperature and relative humidity values, or can output signals such as current, voltage, and frequency
Sensor or transmitter, or a temperature and humidity recorder or memory that stores temperature and humidity values in the instrument:
3 Metrological characteristics
3:1 The correction value of the thermometer and hygrometer
3:2 The humidity stability of the thermometer and hygrometer
4 Calibration conditions
4:1 Environmental conditions
Ambient temperature: (20~30)℃; Ambient humidity: < 85% RH:
4:2 Measurement standards and other equipment
4:2:1 Precision dew point meter: measuring range is (-20~ 40)℃ (dew point or frost point temperature); maximum allowable error
It is ±0:2℃ (dew point or frost point temperature):
4:2:2 Digital thermometer: The measuring range is (-20~100)℃; the maximum allowable error is ±0:05℃:
4:2:3 Humidity generator (including temperature and humidity standard box): the humidity range is 10%RH~95%RH, and the uniformity is not large
At 1:0% RH, the fluctuation does not exceed ±1:0% RH; the temperature range is (5~50) ℃, and the uniformity does not exceed
0:3℃, fluctuation degree does not exceed ±0:2℃:
5 Calibration items and calibration methods
Calibration items can be selected and used according to the intended use of the calibrated instrument: Deviations from the calibration specification shall be
Indicated in the book:
5:1 Calibration equipment installation
Put the calibrated thermometer and hygrometer into the test room of the humidity generator or the center of the temperature and humidity standard box, and at the same time
Put the dew point sensor of the standard thermometer and precision dew point meter (or pass the moisture in the test room through the wall thickness not less than
1mm PTFE tube is introduced into the dew point sensor outside the test room):
5:2 Correction value of thermometer and hygrometer
5:2:1 When calibrating, first set the temperature value of the humidity generator (for example: 20℃ or 25℃): When the temperature is balanced, set
The humidity value of the constant humidity generator is generally from low humidity (for example: 10% RH) to high humidity (for example: 90% RH),
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