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JJG 237-2010 English PDF

US$419.00 · In stock
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JJG 237-2010: Verification regulation of stopwatches
Status: Valid

JJG 237: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJG 237-2010	English	419	Add to Cart	3 days [Need to translate]	Verification regulation of stopwatches	Valid	JJG 237-2010
JJG 237-1995	English	439	Add to Cart	4 days [Need to translate]	Verification Regulation of Time Interval Measuring Instrument with Needle Indication	Obsolete	JJG 237-1995

PDF similar to JJG 237-2010

Standard similar to JJG 237-2010

GB/T 3222.1 JJG 188 JJF 1396 JJG 802 JJG 488 JJG 238

Basic data

Standard ID	JJG 237-2010 (JJG237-2010)
Description (Translated English)	Verification regulation of stopwatches
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A57
Classification of International Standard	17.080
Word Count Estimation	18,141
Date of Issue	2010-09-06
Date of Implementation	2011-03-06
Older Standard (superseded by this standard)	JJG 237-1995; JJG 238-1995
Quoted Standard	JJF 1001-1998; JJF 1002-1998; JJF 1180-2007; GB/T 22773-2008; GB/T 22778-2008
Regulation (derived from)	AQSIQ Announcement No. 100 of 2010
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine
Summary	This standard applies to stopwatch (Stopwatch, mechanical stopwatch Analog stopwatch and digital electric electrical stopwatch) first test, follow-up test and use test.

JJG 237-2010: Verification regulation of stopwatches

---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 stopwatches State verification procedures People's Republic of China Stopwatch Stopwatches Issued on. 2010-09-06 2011-03-06 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Stopwatch test procedures Stop Replacing JJG 237-1995 JJG 238-1995 Appendix 3 The regulations by the State Administration of Quality Supervision, Inspection and Quarantine approved on September 6, 2010, and from From March 6, 2011 into effect. Focal point. the National Commission on Time and Frequency Measurement Technology Drafting units. China Institute of Metrology The national time and frequency measurement procedures commissioned technical committee responsible for the interpretation The drafters of the regulations. Talk On (China Institute of Metrology) Dayu Ning (China Institute of Metrology)

1 Scope (1) 2. Referenced Documents (1) 3 Terms and definitions (1) 4 Overview (1) 5 metering performance requirements (2) 5.1 electronic stopwatch (2) 5.2 Mechanical stopwatch (2) 5.3 Analog electronic stopwatch (3) 5.4 digital electric stopwatch (3) 6 General Requirements (4) 7 control of measuring instruments (4) 7.1 test conditions (4) 7.2 test items and test methods (5) 7.3 Verification Results Processing (9) 7.4 test cycle (9) Appendix A test certificate page format (10) Appendix B test results of notice-page format (12) Stopwatch test procedures

1 Scope

The order applies to a stopwatch (electronic stopwatch, mechanical stopwatch, electronic stopwatch Analog and digital electric stopwatch) first Verification, testing and verification subsequent use.

2 Citations

JJF1001-1998 common measurement terms and definitions JJF1002-1998 national verification procedures to write rules JJF1180-2007 time and frequency measurement terminology and definitions GB/T 22773-2008 mechanical stopwatch GB/T 22778-2008 LCD digital quartz stopwatch When using this specification it should be noted that using the currently valid version of the documents cited.

3 Terms and definitions

3.1 day difference dayerror Electronic stopwatch measured time interval of 1 day of measurement error. 3.2 based timebase When digital electric stopwatch chosen unit of time. 3.3 base bias timeoffset Timebase actual value and the nominal value of the difference. 3.4 timebase accuracy timebaseaccuracy The maximum range of the base bias, relative value unsigned representation. 3.5 inherent error inherenterror Stopwatch transmission mechanism within the error introduced pointer electricity.

4 Overview

The stopwatch is a simple time interval measuring instruments, divided into electronic stopwatch, mechanical and electrical stopwatch stopwatch. Electronic stopwatch as the main local oscillator crystal oscillator, the measurement results are displayed in LCD digital, minimum display bit general Is 10ms, a small number of 1ms. Measurement error comes mainly from the frequency accuracy of the quartz oscillator. Mechanical stopwatch main local oscillator oscillating mechanical springs, rotate the dial pointer driven by gear, costs The dial display measurement results. Minimum scale typically 0.1s or 0.2s, 0.01s or individual is 0.02s. The accuracy of measurement errors from gossamer oscillation period, the gap and friction transmission gear. There are two electric stopwatch. Analog and digital. Analog stopwatch electricity use 50Hz, 220V (or 110V) mains-driven micro-motor, driven by the clutch The pointer on the dial rotation, scale in degrees on the disk display the measurement results. Clutch pull on and off by the measured signal through

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