JJG 492-2009 English PDF

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 492-2009	919	Add to Cart	5 days	Verification Regulation of Cesium Atomic Frequency Standards	Obsolete
JJG 492-1987	399	Add to Cart	3 days	Verification Regulation of Cesium Beam Frequency Standard	Obsolete

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Basic data

Standard ID: JJG 492-2009 (JJG492-2009)
Description (Translated English): Verification Regulation of Cesium Atomic Frequency Standards
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A57
Classification of International Standard: 17.080
Word Count Estimation: 22,263
Date of Issue: 2009-05-18
Date of Implementation: 2009-11-18
Older Standard (superseded by this standard): JJG492-1987
Quoted Standard: JJF 1001-1998; JJF 1180-2007; JJG 2007-2007; JJF 1001-1998; JJF 1180-2007; JJG 2007-2007
Regulation (derived from): AQSIQ Announcement No. 54 of 2009
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to cesium atomic frequency standard (cesium atomic clock) of the initial verification, testing and use of follow-up inspection.

JJG 492-2009: Verification Regulation of Cesium 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.
Verification Regulation of Cesium Atomic Frequency Standards State verification procedures People's Republic of China Cesium atomic frequency standard Posted 2009-05-18 2009-11-18 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Cesium atomic frequency standard test procedures Standards Replacing JJG 492-1987 The regulations by the State Administration of Quality Supervision, Inspection and Quarantine approved on May 18, 2009, and from From November 18, 2009 into effect. Focal point. the National Commission on Time and Frequency Measurement Technology The main drafting units. China Institute of Metrology Participated in the drafting. CASIC hospital two hundred and three The national time and frequency measurement procedures commissioned technical committee responsible for the interpretation The main drafters of this procedure. Zhang Aimin (China Institute of Metrology) Drafters participate. Talk On (China Institute of Metrology) Dayu Ning (China Institute of Metrology) Xu Yueqing (CASIC hospital two hundred and three)

table of Contents

1 Scope (1) 2. Referenced Documents (1) 3 Overview (1) 4 metering performance requirements (1) 4.1 output frequency and amplitude (1) 4.2 Frequency stability (1) 4.3 Phase Noise (2) 4.4 Frequency accuracy (2) 4.5 Frequency adjustment (2) 4.6 Harmonic and non-harmonic distortion (2) 4.7 seconds pulse (1PPS) output (2) 4.8 Clock synchronization (3) 5 General technical requirements (3) 5.1 Appearance flag (3) 5.2 Other requirements (3) 6 Control of measuring instruments (3) 6.1 Verification condition (3) 6.2 test items and test methods (4) 6.3 Verification Results Processing (9) 6.4 test cycle (9) A ratio of two kinds of Appendix Frequency Standard Principle (10) Appendix B test certificate (in-page) format (12) Appendix C test results notice (within the page) format (14) Cesium atomic frequency standard test procedures

1 Scope

The order applies to cesium atomic frequency standard (cesium atomic clock) the initial verification, subsequent verification and in-service inspection.

2 Citations

JJF1001-1998 common measurement terms and definitions JJF1180-2007 time and frequency measurement terminology and definitions JJG 2007-2007 time and frequency measuring instruments Verification System When using this procedure, it should pay attention to using the currently valid version of the documents cited.

3 Overview

Cesium atomic frequency standard (hereinafter referred to as cesium frequency standard) is a passive atomic frequency standard, the physical part (cesium atom Composition resonator) and the circuit section. Internal resonator cesium atomic energy level transition occurs in the microwave excitation signal sensing; circuit Section contains quartz crystal oscillators, frequency synthesizers and frequency control circuit. Quartz crystal frequency control circuit for adjusting Oscillator frequency, the output frequency is locked to the transition frequency of cesium atoms. The basic principle is shown in Fig.

1 cesium atomic frequency standard schematics

With digital time indication of the cesium frequency standard, also known as cesium atomic clock. And cesium frequency standard cesium atomic clock with high frequency accuracy, widely used in scientific research, defense, communications, navigation, Metering.

4 metering performance requirements

4.1 output frequency and amplitude Frequency. 5MHz, 10MHz Margin. ≥1V (50Ω) 4.2 Frequency stability Table 1, τ represents the sampling time, σy (τ) (alendronate standard deviation) showing frequency stability. ......

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