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JJF 1662-2017 English PDF

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JJF 1662-2017: Calibration Specification for Clock Testers
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Basic data

Standard ID JJF 1662-2017 (JJF1662-2017)
Description (Translated English) Calibration Specification for Clock Testers
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A57
Word Count Estimation 14,135
Date of Issue 2017-11-20
Date of Implementation 2018-02-20
Regulation (derived from) AQSIQ Notice 2017 No. 103
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine

JJF 1662-2017: Calibration Specification for Clock Testers

---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 Clock Testers People's Republic of China National Metrology Technical Specifications Clock Tester Calibration Specifications Published on.2017-11-20 2018-02-20 Implementation The State Administration of Quality Supervision, Inspection and Quarantine issued Clock Tester Calibration Specifications Key units. National Time Frequency Measurement Technical Committee Drafted by. Zhejiang Institute of Metrology Shanghai Institute of Metrology and Measurement Technology Wenzhou Institute of Metrology and Technology Participated in drafting. Jiangsu Academy of Metrology Zhejiang Hanpu Power Technology Co., Ltd. This specification entrusts the National Time Frequency Measurement Technical Committee to explain The main drafters of this specification. Han Hailin (Zhejiang Provincial Institute of Metrology) Dong Lian (Shanghai Measurement and Measurement Technology Research Institute) Zhou Xiaohua (Wenzhou Metrological Technology Research Institute) Participating drafters. Jin Rong (Jiangsu Institute of Metrology Science) Chen Shuiming (Zhejiang Hanpu Power Technology Co., Ltd.) Chen Hao (Zhejiang Institute of Metrology)

table of Contents

Introduction (II) 1 Scope (1) 2 References (1) 3 Overview (1) 4 Metrological characteristics (1) 4.1 Timekeeping Error (1) 4.2 Frequency Measurement (1) 4.3 Frequency Output Signal (1) 4.4 Clock Time Error (1) 5 Calibration Conditions (1) 5.1 Environmental Conditions (1) 5.2 Measurement Standards and Other Equipment (2) 6 Calibration Items and Calibration Methods (2) 6.1 Appearance and normality check (2) 6.2 Timekeeping Error (2) 6.3 Frequency Measurement (2) 6.4 Frequency Output Signal (3) 6.5 Clock Time Error (3) 7 Expression of Calibration Results (4) 8 Re-school interval (4) Appendix A Calibration Record Format (5) Appendix B Calibration Certificate (Inner Page) Format (6) Appendix C Example of Calibration Uncertainty (7)

Introduction

This specification is based on JJF 1071-2010 "Rules for the preparation of national metrological calibration specifications", JJF 1001-2011 Using Measurement Terms and Definitions" and JJF 1059.1-2012 Evaluation and Expression of Measurement Uncertainty. This specification is the first release. Clock Tester Calibration Specifications

1 Scope

This specification is applicable to the calibration of clock testers that measure the metering performance such as the daily timing error of the meter.

2 references

This specification refers to the following documents. JJG180 Quartz Crystal Oscillator in Electronic Measuring Instruments For dated references, only dated editions apply to this specification; all undated references The latest version (including all amendments) applies to this specification.

3 Overview

The clock tester is generally composed of a waveform shaping circuit, a frequency dividing circuit, an electronic control circuit, a display circuit, and the like. There are functions such as fast measurement of the built-in clock signal of the power meter, display of the timing error and frequency deviation of the second pulse. Clock test Instrument is widely used in electric energy meter production companies and measurement departments.

4 Metrological characteristics

4.1 Daily timing error 4.1.1 Measurement range. (-10~10)s; 4.1.2 Measurement error. ±0.05s. 4.2 Frequency Measurement 4.2.1 Measurement range. 1Hz~10MHz; 4.2.2 maximum allowable error. ± 2 × 10-7 × f (f is the measured frequency). 4.3 Frequency Output Signal 4.3.1 Output frequency. 100kHz, 50kHz, 10kHz, 1kHz; 4.3.2 boot characteristics. better than 5×10-8; 4.3.3 Relative mean frequency deviation. better than ±2×10-7. 4.4 Clock Time Error Better than ±1s. Note. The above indicators are not used for qualification. They are for reference only.

5 calibration conditions

5.1 Environmental conditions 5.1.1 Ambient temperature. Choose one point within the range of (15~30)°C. The change of ambient temperature during calibration should not exceed Over ±2°C, and there should be no sudden temperature change. 5.1.2 Relative humidity in the environment. ≤ 80%.

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