JJG 723: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 723-2008 | English | 599 |
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Verification Regulation of Time Interval Generator
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JJG 723-2008
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| JJG 723-1991 | English | 239 |
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Verification Regulation of Time Interval Generator
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JJG 723-1991
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PDF similar to JJG 723-2008
Basic data | Standard ID | JJG 723-2008 (JJG723-2008) | | Description (Translated English) | Verification Regulation of Time Interval Generator | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A57 | | Classification of International Standard | 17.080 | | Word Count Estimation | 15,195 | | Date of Issue | 2008-03-25 | | Date of Implementation | 2008-09-25 | | Older Standard (superseded by this standard) | JJG 723-1991; JJG 803-1993 | | Regulation (derived from) | ?AQSIQ Announcement 2008 No.35 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | | Summary | This standard applies to the output range 10ns ~ 10000s time interval generator initial verification, follow-up tests and in-service inspection. | JJG 723-2008: Verification Regulation of Time Interval Generator---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 Time Interval Generator
State verification procedures People's Republic of China
Time interval generator
Posted 2008-03-25
2008-09-25 implementation
The State Administration of Quality Supervision, Inspection and Quarantine released
Time interval generator test procedures
Replacing JJG 723-1991
JJG 803-1993
The regulations by the State Administration of Quality Supervision, Inspection and Quarantine approved on March 25, 2008, and from
From September 25, 2008 into effect.
Focal point. the National Commission on Time and Frequency Measurement Technology
Drafting unit. Hebei Institute of Metrology
The national time and frequency measurement procedures commissioned technical committee responsible for the interpretation
The drafters of the regulations.
Bai Lijun (Hebei Science Institute of Measurement)
Huang Jianzhe (Hebei Science Institute of Measurement)
Su crown (Hebei Science Institute of Measurement)
table of Contents
1 Scope (1)
2 Overview (1)
3 Terms (1)
4 metering performance requirements (1)
4.1 inside the crystal oscillator (1)
4.2 Output interval (1)
4.3 Pulse Output (2)
5 General Requirements (2)
5.1 Appearance and flags (2)
5.2 Other requirements (2)
6 Control of measuring instruments (2)
6.1 Verification condition (2)
6.2 Verification Project (3)
6.3 Verification Methods (3)
Processing 6.4 Verification Results (6)
6.5 test cycle (6)
Appendix A test certificate (in-page) format (7)
Time interval generator test procedures
1 Scope
The order applies to the output range 10ns ~ 10000s interval generator initial verification, verification and follow-up
In-service inspection.
2 Overview
Time interval generator, also known as the synthesizer is based on a highly stable quartz oscillator oscillation period as the standard,
Using digital synthesis technology to generate a pulse period can be set, the delay time, pulse width, and many other intervals
signal.
Time interval generator is widely used in navigation, communications and other time control systems, measuring instruments calibration time
It can serve as the standard source.
3 Terms
3.1 Pulse Width (pulsewidth)
Pulse front edge midpoint to the midpoint of the time interval after.
3.2 delay time (timedelay)
Sync pulse leading edge midpoint to the midpoint of the output pulse edge interval.
4 metering performance requirements
4.1 machine crystal oscillator
4.1.1 Output frequency. 1MHz, 5MHz or 10MHz
4.1.2 Power characteristics. 1 × 10-8 ~ 1 × 10-11
4.1.3 Day frequency fluctuation. 1 × 10-8 ~ 1 × 10-11
4.1.4 Day aging rate. 1 × 10-8 ~ 1 × 10-11
4.1.5 one second frequency stability. 1 × 10-10 ~ 1 × 10-12
4.1.6 frequency reproducibility. 1 × 10-8 ~ 1 × 10-11
4.1.7 Frequency Accuracy. 1 × 10-7 ~ 1 × 10-10
4.2 Interval output
4.2.1 Output Range. 10ns ~ 10000s
4.2.2 Output.
Single pulse cycle pulse train output, pulse width; two time intervals between the output pulse train and so on.
Time interval generator may have a plurality of output channels, the polarity of the output pulse can be positive or negative, there is logic and positive pulse
Reverse pulse.
4.2.3 Interval maximum permissible error. ± (T × crystal frequency accuracy Δ). T for a given time interval;
Δ the maximum error is introduced outside the crystal oscillator, the instructions given by the subject instrument.
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