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JJG 238-2018 English PDF

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Q: Should I purchase the latest version JJG 238-2018?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 238-2018 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.

US$329.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 238-2018: Time Interval Meters
Status: Valid

JJG 238: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 238-2018	329	Add to Cart	3 days	Time Interval Meters	Valid
JJG 238-1995	559	Add to Cart	3 days	Verification regulation of digital time interval measuring instrument	Obsolete

Similar standards

GB/T 3222.1 JJG 188 JJF 1396 JJG 802 JJG 488 JJG 237

Basic data

Standard ID: JJG 238-2018 (JJG238-2018)
Description (Translated English): Time Interval Meters
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A57
Word Count Estimation: 14,111
Date of Issue: 2018-02-27
Date of Implementation: 2018-08-27
Older Standard (superseded by this standard): JJG 238-1995; JJG 953-2000
Regulation (derived from): AQSIQ Announcement No. 26 of 2018
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine

JJG 238-2018: Time Interval Meters

---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.
(Interval meter verification procedure) National Metrology Verification Regulations of the People's Republic Time interval measuring instrument Published on.2018-02-27 2018-08-27 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Replace JJG 238-1995 JJG 953-2000 Focal Point. National Time Frequency Measurement Technical Committee Main drafting unit. Liaoning Institute of Metrology Participated in the drafting unit. Communication and Measurement Center of the Ministry of Industry and Information Technology Shanghai Institute of Metrology and Testing Technology Shandong Institute of Metrology Shijiazhuang Digital Instrument Co., Ltd. This procedure entrusts the National Time Frequency Measurement Technical Committee to explain The main drafters of this procedure. Jin Yuehong (Liaoning Institute of Metrology) Hao Song (Liaoning Institute of Metrology) Qin Tong (Liaoning Institute of Metrology) Participate in the drafters. Yan Xinyu (Communication and Measurement Center, Ministry of Industry and Information Technology) Dong Lian (Shanghai Institute of Metrology and Testing Technology) Li Wenqiang (Shandong Institute of Metrology) Feng Wei (Shijiazhuang Digital Instrument Co., Ltd.)

Introduction (II) 1 Scope (1) 2 References (1) 3 terms (1) 3.1 Effective resolution (1) 4 Overview (1) 5 Metrological performance requirements (2) 5.1 Built-in time base oscillator (2) 5.2 Time interval (2) 6 General technical requirements (2) 7 measuring instrument control (2) 7.1 Verification conditions (2) 7.2 Verification items and verification methods (3) 7.3 Processing of verification results (6) 7.4 Verification cycle (6) Appendix A Time Interval Meter Verification Record Data Page Format (7) Appendix B Time Interval Meter Verification Certificate Inner Page Format (9) Appendix C Time Interval Measurement Instrument Verification Result Notice Page Format (10)

Introduction

This regulation is based on JJF1001-2011 "General Measurement Terms and Definitions", JJF1002-2010 "National Metrology Inspection Rules for the preparation of rules, for JJG 238-1995 "Digital time interval measuring instrument" and JJG 953-2000 "fine The Closed Time Interval Meter is revised and revised. Compared with JJG 238-1995 and JJG 953-2000, in addition to editorial changes, the main technical changes are as follows. --- Modified the time interval measurement range; ---Increase introductions, citations, terminology, general technical requirements and measurement instrument control content; ---Modified and supplemented the content of measurement performance requirements; --- Refine and clarify the verification conditions and verification methods; --- Increase the format of the verification record format and the page within the verification result notice. The previous versions of this procedure are released as follows. ---JJG 953-2000; ---JJG 238-1981; ---JJG 238-1995. Time interval measuring instrument verification procedure

1 Scope

This procedure is applicable to the first verification of time interval measuring instruments with a time interval ranging from 1 ns to 10000 s. Subsequent verification and in-use inspection.

2 reference files

This procedure refers to the following documents. JJG 180 electronic measuring instrument quartz crystal oscillator JJG 181 quartz crystal frequency standard JJG 292 铷 atomic frequency standard For dated references, only the dated version applies to this procedure; for undated references, The latest version (including all amendments) applies to this procedure.

3 terms

3.1 Effective resolution effective resolution The instrument displays the magnitude of the stable, accurate lowest digit in the measurement.

4 Overview

A time interval measuring instrument (hereinafter referred to as a measuring instrument) is an instrument that measures time intervals. Built-in vibration Units for frequency division, frequency division multiplication, signal conditioning, time interval gates, counters, control circuits, and keyboards and displays to make. The meter works by measuring the time between measurements using a standard time (time base) signal with known accuracy. Separate. Signal A and signal B are coupled, amplified, shaped, and sent to the time interval gate to generate electricity through the signal conditioning circuit. Path, generating a time interval gate; the signal of the built-in oscillator is processed by the frequency division multiplier unit and then fills the time interval gate Gate, the counter measures the number of filled pulses, the control circuit samples, records, and the data obtained by the counter, and controls The keyboard and display unit display the measurement results. Its principle block diagram is shown in Figure 1. Time interval measuring instruments are widely used in fields such as metrology, communication, and high-energy physics. Figure 1 Time interval measuring instrument block diagram ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 238-2018_English be delivered?

Answer: Upon your order, we will start to translate JJG 238-2018_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJG 238-2018_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 238-2018_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 Sales@ChineseStandard.net. 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.

Question 5: Should I purchase the latest version JJG 238-2018?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 238-2018 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.