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JJG 238-2018: Time Interval Meters
Status: Valid JJG 238: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 238-2018 | English | 329 |
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Time Interval Meters
| Valid |
JJG 238-2018
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| JJG 238-1995 | English | 559 |
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Verification regulation of digital time interval measuring instrument
| Obsolete |
JJG 238-1995
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PDF similar to JJG 238-2018
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Count Estimation | 14,111 | | Date of Issue | 2018-02-27 | | Date of Implementation | 2018-08-27 | | Older Standard (superseded by this standard) | JJG 238-1995; JJG 953-2000 | | Regulation (derived from) | AQSIQ Announcement No. 26 of 2018 | | Issuing agency(ies) | General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.)
table of Contents
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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