JJG 723-2008 English PDFJJG 723: Historical versions
Basic dataStandard 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17.080 Word Count Estimation: 15,195 Date of Issue: 2008-03-25 Date of Implementation: 2008-09-25 Older Standard (superseded by this standard): JJG 723-1991; JJG 803-1993 Regulation (derived from): ?AQSIQ Announcement 2008 No.35 Issuing agency(ies): General Administration of Quality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 Contents1 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 procedures1 ScopeThe order applies to the output range 10ns ~ 10000s interval generator initial verification, verification and follow-up In-service inspection.2 OverviewTime 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 Terms3.1 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 requirements4.1 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. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of JJG 723-2008_English be delivered?Answer: Upon your order, we will start to translate JJG 723-2008_English as soon as possible, and keep you informed of the progress. The lead time is typically in 9 seconds (download/delivered in 9 seconds). The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of JJG 723-2008_English with my colleagues?Answer: Yes. 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Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 723-2008 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |