JJF 1956-2021 English PDF

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JJF 1956-2021: Calibration Specification for Hydrogen Atomic Frequency Standards
Status: Valid

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JJF 1956-2021	619	Add to Cart	5 days	Calibration Specification for Hydrogen Atomic Frequency Standards	Valid

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Basic data

Standard ID: JJF 1956-2021 (JJF1956-2021)
Description (Translated English): Calibration Specification for Hydrogen Atomic Frequency Standards
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A57
Word Count Estimation: 27,246
Issuing agency(ies): State Administration for Market Regulation

JJF 1956-2021: Calibration Specification for Hydrogen Atomic Frequency Standards

---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 Hydrogen Atomic Frequency Standards National Metrology Technical Specification of the People's Republic of China Standard Calibration Specification for Hydrogen Atomic Frequency Published on 2021-12-28 2022-06-28 Implementation Released by the State Administration for Market Regulation Standard Calibration Specification for Hydrogen Atomic Frequency Replacing JJG1004-2005 Focal Point. National Time and Frequency Measurement Technical Committee Main drafting unit. China Institute of Metrology Participating in the drafting unit. Beijing Radio Measurement and Testing Institute Strategic Support Force Aerospace Systems Department Equipment Department National Defense University This specification entrusts the National Time and Frequency Measurement Technical Committee to be responsible for the interpretation The main drafters of this specification. Wang Yuzhuo (China Institute of Metrology) Zhang Aimin (China Institute of Metrology) Liu Nianfeng (China Institute of Metrology) Participating drafters. Yang Jun (Beijing Radio Measurement and Testing Institute) Liu Dan (Beijing Radio Measurement and Testing Institute) Zeng Liang (Strategic Support Force Aerospace Systems Department Equipment Department) Gong Hang (National University of Defense Technology)

Table of contents

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Overview(1) 4 Metrology Characteristics(2) 4.1 Output frequency and amplitude(2) 4.2 Frequency Stability(2) 4.3 Frequency Drift Rate(2) 4.4 Relative frequency deviation(2) 4.5 Phase noise(2) 4.6 Harmonic and non-harmonic distortion(2) 4.7 second pulse (1PPS) output(3) 4.8 Clock synchronization(3) 5 Calibration Conditions(3) 5.1 Environmental conditions (3) 5.2 Measurement standards and other equipment(3) 6 Calibration items and calibration methods (4) 6.1 Calibration items(4) 6.2 Calibration method(5) 7 Expression of calibration results (9) 8 Recalibration interval (10) Appendix A Raw Record Format (11) Appendix B Calibration Certificate (Inner Page) Format (15) Appendix C Example of Uncertainty Evaluation of Main Calibration Items (17)

Introduction

This specification is based on JJF 1071-2010 "Rules for Compilation of National Metrology Calibration Specifications" and JJF 1059.1-2012 "Measurement Uncertainty Evaluation and Representation" written. This specification is a revision of JJG1004-2005 "Hydrogen Atomic Frequency Standard". The revisions are as follows. ---According to JJG2007-2015 "Time and Frequency Measuring Instruments", the frequency accuracy is changed to relative frequency deviation; --- Added frequency signal amplitude, harmonic and non-harmonic distortion, second pulse amplitude and width, when second pulse rises time, second pulse jitter, clock synchronization calibration items; --- Delete the long-distance calibration method of frequency temperature characteristics and frequency value; ---Improved the measurement methods of frequency stability, frequency drift rate and relative frequency deviation. Previous releases of this specification. ---JJG1004-2005. Standard Calibration Specification for Hydrogen Atomic Frequency

1 Scope

This specification applies to the calibration of hydrogen atomic frequency standards.

2 Reference documents

This specification references the following documents. JJF 1001-2011 General Metrology Terms and Definitions JJF 1180 Terms and Definitions of Time and Frequency Measurement JJF 1206-2018 Specification for remote calibration of time and frequency standards JJG2007-2015 Time and frequency measuring instruments For dated references, only the dated version applies to this specification; for undated references The latest version (including all amendments) applies to this specification.

3 Overview

The hydrogen atomic frequency standard (hereinafter referred to as the hydrogen frequency standard) is divided into active type and passive type according to its working mechanism. The difference lies in the way the transition frequency signal is generated. the atomic resonator of the active hydrogen frequency standard is a self-sustained oscillation It can continuously output atomic transition frequency signals without external excitation, as shown in Figure 1; The resonator needs to generate atomic transition frequency signal under the excitation of external signal, as shown in Figure 2.Both are through a set of The servo control system locks the crystal oscillator on the atomic transition frequency, and the output frequency of the crystal oscillator has the same frequency as the atomic transition frequency. The relative frequency deviation and long-term stability characteristics of the same level, after the distribution and other processing, the output signal of the hydrogen frequency standard is generated. number for external use. Fig.1 Basic working principle of active hydrogen atomic frequency standard Figure 2 Basic working principle of passive hydrogen atomic frequency standard ......

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