HOME   Cart(0)   Quotation   About-Us Policy PDFs Standard-List
www.ChineseStandard.net Database: 189760 (18 Oct 2025)

JJF 1957-2021 English PDF

US$729.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJF 1957-2021: Calibration Specification for Rubidium Atomic Frequency Standards
Status: Valid
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJF 1957-2021English729 Add to Cart 5 days [Need to translate] Calibration Specification for Rubidium Atomic Frequency Standards Valid JJF 1957-2021

PDF similar to JJF 1957-2021


Standard similar to JJF 1957-2021

GB/T 3222.1   JJF 1234   JJF 1396   JJF 1955   JJF 1956   JJF 1954   

Basic data

Standard ID JJF 1957-2021 (JJF1957-2021)
Description (Translated English) Calibration Specification for Rubidium Atomic Frequency Standards
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A57
Word Count Estimation 32,336
Issuing agency(ies) State Administration for Market Regulation

JJF 1957-2021: Calibration Specification for Rubidium 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.
Calibration Specification for Rubidium Atomic Frequency Standards National Metrology Technical Specification of the People's Republic of China Rubidium Atomic Frequency Standard Calibration Specification Published on 2021-12-28 2022-06-28 Implementation Released by the State Administration for Market Regulation Rubidium Atomic Frequency Standard Calibration Specification Replacing JJG292-2009 Focal Point. National Time and Frequency Measurement Technical Committee Main drafting unit. Beijing Radio Measurement and Testing Institute Participating in the drafting unit. China Institute of Metrology Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences This specification entrusts the National Time and Frequency Measurement Technical Committee to be responsible for the interpretation The main drafters of this specification. Shen Tingmei (Beijing Radio Measurement and Testing Institute) Liu Dan (Beijing Radio Measurement and Testing Institute) Participating drafters. Zhang Aimin (China Institute of Metrology) Zhang Yue (China Institute of Metrology) Xu Yueqing (Beijing Radio Measurement and Testing Institute) An Shaofeng (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences)

Table of contents

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Overview(1) 4 Metrology Characteristics(2) 4.1 Output signal(2) 4.2 Harmonics and non-harmonics(2) 4.3 Relative frequency deviation(2) 4.4 Power-on characteristics(2) 4.5 Daily Frequency Drift Rate(2) 4.6 Frequency Stability(3) 4.7 Phase noise(3) 4.8 Frequency Reproducibility(3) 4.9 Frequency adjustment(3) 4.10 GNSS tames the relative frequency deviation of the rubidium frequency standard (3) 4.11 GNSS Tames Rubidium Frequency Standard Second Pulse Timing Deviation(3) 4.12 GNSS taming the rubidium frequency scale second pulse timing stability (3) 5 Calibration Conditions(3) 5.1 Environmental conditions (3) 5.2 Measurement standards and other equipment(4) 6 Calibration items and calibration methods (4) 6.1 Calibration items(4) 6.2 Calibration method(5) 7 Expression of calibration results (11) 8 Recalibration interval(11) Appendix A Raw Record Format(12) Appendix B Calibration Certificate (Inner Page) Format (15) Appendix C Example of Uncertainty Evaluation of Main Calibration Items (17)

Introduction

This specification is based on JJF 1071-2010 "Rules for Compilation of National Metrology Calibration Specifications" and JJF 1059.1-2012 "Measurement Uncertainty Evaluation and Representation" written. This specification is a revision of JJG292-2009 "Rubidium Atomic Frequency Standard". Compared with JJG292-2009, The technical revisions are as follows. ---According to JJG2007-2015 "Time and Frequency Measuring Instruments", the frequency accuracy is modified to the relative frequency deviation; --- Corrected the formula for calculating Allen's standard deviation when deducting frequency drift; --- Added calibration items for GNSS to tame rubidium atomic frequency standard second pulse timing deviation and timing stability; --- Improve the frequency stability and relative frequency deviation measurement methods. Previous releases of this specification. ---JJG292-2009; ---JJG292-1996. Rubidium Atomic Frequency Standard Calibration Specification

1 Scope

System) to tame the calibration of rubidium atomic frequency standards.

2 Reference documents

This specification references the following documents. JJF 1001-2011 General Metrology Terms and Definitions JJF 1180 Terms and Definitions of Time and Frequency Measurement JJF 1403-2013 Global Navigation Satellite System (GNSS) Receiver (Time Measurement Type) Calibration Specification JJG2007-2015 Time and frequency measuring instruments For dated references, only the dated version applies to this specification; for undated references The latest version (including all amendments) applies to this specification.

3 Overview

The rubidium atomic frequency standard (hereinafter referred to as the rubidium frequency standard) is a passive atomic frequency standard, and its working principle is shown in Figure 1. The crystal oscillator generates a microwave excitation signal through frequency synthesis technology, and the rubidium isotope atoms are induced in the microwave excitation signal. A transition occurs under the atomic transition signal, and the frequency of the atomic transition signal and the microwave signal is discriminated to generate an error signal, and the crystal is controlled by a frequency-locked loop. The frequency of the oscillator is adjusted to lock the frequency of the microwave synthesized by the crystal oscillator to the transition frequency of the rubidium atom, and a highly stable signal is output. Figure 1 Working principle of rubidium frequency standard The working principle of GNSS taming rubidium frequency standard is shown in Figure 2.The time difference (or phase difference) measurement circuit is used to measure GNSS The time difference between the output 1PPS signal and the output 1PPS signal of the rubidium frequency standard to be tamed, the control unit changes according to the time difference or phase difference. The chemical quantity continuously adjusts the output signal of the rubidium frequency standard to make it have a smaller frequency deviation.

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJF 1957-2021_English be delivered?

Answer: Upon your order, we will start to translate JJF 1957-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJF 1957-2021_English with my colleagues?

Answer: Yes. The purchased PDF of JJF 1957-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.