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Calibration Specification for Analog Clocks
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JJF 1901-2021
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Basic data Standard ID | JJF 1901-2021 (JJF1901-2021) | Description (Translated English) | Calibration Specification for Analog Clocks | Sector / Industry | Metrology & Measurement Industry Standard | Classification of Chinese Standard | A57 | Word Count Estimation | 20,279 | Issuing agency(ies) | State Administration for Market Regulation |
JJF 1901-2021: Calibration Specification for Analog Clocks---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 Analog Clocks
National Metrology Technical Specifications of the People's Republic of China
Analogue precision clock calibration specification
Released on 2021-02-23
2021-08-23 implementation
Issued by the State Administration for Market Regulation
Analogue precision clock calibration specification
forAnalogClocks
Replace JJG106-1981
Focal point. National Technical Committee of Time and Frequency Measurement
Main drafting unit. Beijing Institute of Metrology and Testing Science
Participated in the drafting. Beijing Watch Quality Supervision and Inspection Station
This specification entrusts the National Time and Frequency Measurement Technical Committee to be responsible for the interpretation
The main drafters of this specification.
Zhong Chongxia (Beijing Institute of Metrology and Testing Science)
Huang Yan (Beijing Institute of Metrology and Testing Science)
Wu Jintie (Beijing Institute of Metrology and Testing Science)
Participating drafters.
Xie Junqi (Beijing Watch Quality Supervision and Inspection Station)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2 Reference documents (1)
3 Term (1)
3.1 Voltage coefficient (1)
4 Overview (1)
5 Measurement characteristics (1)
5.1 Daily difference (1)
5.2 Voltage coefficient(1)
5.3 Synchronization error at current moment (2)
5.4 Loss of lock reacquisition time (2)
6 Calibration conditions (2)
6.1 Environmental conditions (2)
6.2 Measurement standards and other equipment (2)
7 Calibration items and calibration methods (3)
7.1 Calibration items (3)
7.2 Calibration method (3)
8 Calibration result expression (6)
9 Re-calibration interval (6)
Appendix A. Format of the inner page of the original record (7)
Appendix B Format of Calibration Certificate (Inner Page) (9)
Appendix C Example of Uncertainty Evaluation of Calibration Results (10)
Introduction
This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1001-2011 "Tong
Compiled with Metrological Terms and Definitions, JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty".
This specification is a revision of JJG106-1981 "Analog Precision Clock". Except for editorial changes, the main technical
The technical changes are as follows.
---The scope of application is changed from the original one, which is suitable for analog precision quartz clocks or machinery with a travel time accuracy not higher than 0.03s
The marine chronometer is modified to be suitable for analog quartz clocks, analog quartz watches, and satellite timing analog precision stones.
Calibration of British clocks and analog precision quartz watches;
---Added metering characteristics;
---Added the calibration item voltage coefficient, current synchronization error, loss-of-lock reacquisition time and corresponding calibration
method.
The release status of previous versions of this specification.
---JJG106-1981.
Analogue precision clock calibration specification
1 Scope
This specification applies to analog quartz clocks with quartz resonators, analog quartz watches, and satellite timing pointers
Calibration of precision quartz clocks and analog precision quartz watches.
2 Reference documents
The following documents are cited in this specification.
JJG237-2010 stopwatch
JJG488-2018 instantaneous daily error measuring instrument
JJG2007-2015 Time and Frequency Measuring Instruments
JJF 1403-2013 Global Navigation Satellite System (GNSS) Receiver (Time Measurement Type) Calibration Specification
GB/T 6046-2016 Analog quartz clock
For dated reference documents, only the dated version applies to this specification; for all undated references
The latest version (including all amendments) is applicable to this specification.
3 Term
3.1 Voltage coefficient voltagecoefficient
The power supply voltage of the quartz clock is reduced from the full-scale power supply voltage to 0.9 times the full-scale power supply voltage, which is converted to every change in voltage
The amount of change in the instantaneous daily difference of the quartz clock caused by 1V.
4 overview
The analog precision clock is a chronograph with a traditional analog dial surface, including a daily difference of ±(0.03~
0.5) s range analog quartz clock and analog quartz watch and satellite time service type analog precision quartz clock and pointer
Style precision quartz watch.
Analog quartz clocks and analog quartz watches use a quartz resonator as an oscillator, and the frequency is generally
32768Hz, the motor is controlled by the electronic frequency divider to drive the pointer. Quartz watches are mainly composed of quartz resonators,
CMOS integrated circuit, stepper motor, power supply, in addition to conductive rubber, fine-tuning capacitors, lighting bulbs,
Buzzer and other components.
Satellite time service type analog precision quartz clock and analog precision quartz watch receive satellite signals for time synchronization,
It is composed of GNSS receiving module, local synchronization calibration unit, error measurement unit, error processing and control structure.
5 Metrological characteristics
5.1 Daily difference
±(0.03~0.5)s.
5.2 Voltage coefficient
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