JJG 492: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 492-2009 | English | 919 |
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Verification Regulation of Cesium Atomic Frequency Standards
| Obsolete |
JJG 492-2009
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| JJG 492-1987 | English | 399 |
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Verification Regulation of Cesium Beam Frequency Standard
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JJG 492-1987
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PDF similar to JJG 492-2009
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Count Estimation | 22,263 | | Date of Issue | 2009-05-18 | | Date of Implementation | 2009-11-18 | | Older Standard (superseded by this standard) | JJG492-1987 | | Quoted Standard | JJF 1001-1998; JJF 1180-2007; JJG 2007-2007; JJF 1001-1998; JJF 1180-2007; JJG 2007-2007 | | Regulation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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