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JJF 1902-2021 English PDF

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JJF 1902-2021: Calibration Specification for Time Interval Generators
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JJF 1902-2021English759 Add to Cart 6 days [Need to translate] Calibration Specification for Time Interval Generators Valid JJF 1902-2021

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Standard similar to JJF 1902-2021

GB/T 3222.1   JJF 1234   JJF 1396   JJF 1901   JJF 1925   JJF 1900   

Basic data

Standard ID JJF 1902-2021 (JJF1902-2021)
Description (Translated English) Calibration Specification for Time Interval Generators
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A57
Word Count Estimation 33,349
Issuing agency(ies) State Administration for Market Regulation

JJF 1902-2021: Calibration Specification for Time Interval Generators

---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 Time Interval Generators National Metrology Technical Specifications of the People's Republic of China Time interval generator calibration specification Released on 2021-02-23 2021-08-23 implementation Issued by the State Administration for Market Regulation Time interval generator calibration specification Replace JJG723-2008 Focal point. National Technical Committee of Time and Frequency Measurement Main drafting unit. Hebei Institute of Metrology Supervision and Inspection Hebei Metrology and Testing Technology Center Participated in the drafting unit. Shijiazhuang Shuying Instrument Co., Ltd. This specification entrusts the National Time and Frequency Measurement Technical Committee to be responsible for the interpretation The main drafters of this specification. Bai Lijun (Hebei Institute of Metrology Supervision and Inspection) Wang Qian (Hebei Metrology and Testing Technology Center) Yan Haifeng (Hebei Institute of Metrology Supervision and Inspection) Participating drafters. Feng Wei (Shijiazhuang Shuying Instrument Co., Ltd.) Zhang Jianqiao (Hebei Institute of Metrology Supervision and Inspection)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 Reference documents (1) 3 Overview (1) 4 Measurement characteristics (2) 4.1 Built-in time base oscillator (2) 4.2 Time interval output (2) 4.3 Pulse output (2) 5 Calibration conditions (2) 5.1 Environmental conditions (2) 5.2 Measuring standards and other equipment (3) 6 Calibration items and calibration methods (3) 6.1 Calibration items (3) 6.2 Calibration method (4) 7 Expression of calibration results (7) 8 Recalibration interval (8) Appendix A Examples of Uncertainty Evaluation of Calibration Results for Major Items (9) Appendix B. Original Record Format of Time Interval Generator Calibration (17) Appendix C Time interval generator calibration certificate (inside page) format (23)

Introduction

This specification is based on JJF 1001-2011 "General Metrology Terms and Definitions", JJF 1071-2010 "National Metrology Compilation of Calibration Specification Compilation Rules and JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty". This specification is a revision of JJG723-2008 "Time Interval Generator". The main revisions are as follows. ---According to JJG2007-2015 "Time and Frequency Measuring Instruments", the frequency accuracy is changed to relative frequency deviation; ---Expanded the time interval measurement range; ---Added calibration items for built-in time base and DC bias voltage; ---Detailed technical indicators of measurement characteristics. The release status of previous versions of this specification. ---JJG723-2008; ---JJG723-1991; ---JJG803-1993. Time interval generator calibration specification

1 Scope

This specification applies to the calibration of the generator with an output range of 1ns~10000s time interval.

2 Reference documents

The following documents are cited in this specification. Quartz crystal oscillator in JJG180 electronic measuring instrument JJG181 Quartz crystal frequency standard JJG292 Rubidium Atomic Frequency Standard JJG2007 Time and Frequency Measuring Instruments JJF 1180 Time-frequency measurement terms and definitions For dated reference documents, only the dated version applies to this specification; for all undated references The latest version (including all amendments) is applicable to this specification.

3 overview

The time interval generator is also called a time synthesizer, which is based on a quartz crystal oscillator or rubidium atomic frequency standard. Clock, using digital synthesis technology to generate various types of time that can be set to pulse period, delay time, pulse width, etc. A measuring instrument for interval signals. The time interval generator is widely used in various time control in the fields of navigation, communication, etc. The system can be used as a standard source when verifying and calibrating time measuring instruments. The output mode of the time interval generator includes the pulse period and pulse width of the single output pulse train, and the two output pulses. The time interval between flush trains, etc. The time interval generator can have multiple output channels, and the output pulse polarity can be positive or negative. Logic forward pulse and reverse pulse. Its principle block diagram is shown as in Fig. 1. Figure 1 Principle of time interval generator

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