JJG 972-2023_English: PDF (JJG972-2023)
| Standard ID | USD | BUY PDF | Lead-Days | Standard Title (Description) | Status |
| JJG 972-2023 | 519 |
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5 days
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Constant Acceleration Centrifugal Test Machines
| Valid |
| JJG 972-2002 | 639 |
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Verification regulation of constant acceleration centrifugal test machines
| Obsolete |
| Standard ID | JJG 972-2023 (JJG972-2023) | | Description (Translated English) | Constant Acceleration Centrifugal Test Machines | | Sector / Industry | Metrology & Measurement Industry Standard | | Word Count Estimation | 25,268 | | Date of Issue | 2023-06-30 | | Date of Implementation | 2023-12-30 | | Issuing agency(ies) | State Administration for Market Regulation |
JJG 972-2023. Calibration regulations for centrifugal constant acceleration testing machine
National Measurement Verification Regulations of the People's Republic of China
Centrifugal constant acceleration testing machine
Published on 2023-06-30
Implemented on 2023-12-30
Released by the State Administration for Market Regulation
Centrifugal constant acceleration testing machine
Calibration procedures
Replace JJG 972-2002
Responsible unit. National Inertial Technology Metrology Technical Committee
Main drafting unit. China Aviation Industry Corporation Beijing Great Wall Measurement and Testing Technology Research Institute
institute
Shaanxi Institute of Metrology
Guangdong Institute of Metrology
Shenzhen AVIC Technical Testing Institute Co., Ltd.
Unit participating in the drafting. Beijing Chenjing Electronics Co., Ltd.
The National Inertial Technology and Measurement Technical Committee is entrusted with the interpretation of this regulation.
The main drafter of this regulation.
Dong Xueming (Research on Measurement and Testing Technology of Beijing Great Wall of Aviation Industry Corporation of China
Place)
Yang Gangwei (Shaanxi Institute of Metrology)
Yang Dejun (Guangdong Institute of Metrology)
Liu Kexian (Shenzhen AVIC Technical Testing Institute Co., Ltd.)
Participating drafters.
Qin Chaojun (Research on Measurement and Testing Technology of Beijing Great Wall of Aviation Industry Corporation of China
Place)
Tang Yi (Beijing Chenjing Electronics Co., Ltd.)
Yun Yun (Shaanxi Institute of Metrology)
Table of contents
Introduction(Ⅱ)
1 range(1)
2 Cited documents(1)
3 terms(1)
4 Overview(3)
5 Measurement performance requirements (3)
6 General technical conditions (4)
6.1 Appearance and accessories(4)
6.2 Safety and Protection(4)
6.3 Working environment of constant acceleration testing machine (4)
7 Measuring instrument control(4)
7.1 Verification conditions (4)
7.2 Verification items and verification methods (5)
7.3 Processing of verification results (12)
7.4 Calibration cycle(12)
Appendix A Calibration Certificate Inner Page Format (13)
Appendix B Format of the inner pages of the verification result notification (14)
Appendix C Constant acceleration testing machine calibration record (15)
introduction
JJF1001-2011 "General Metrology Terms and Definitions", JJF1002-2010 "Compilation of National Metrology Verification Regulations"
Rules" and JJF1059.1-2012 "Evaluation and Expression of Measurement Uncertainty" jointly form the basis for revising this specification
Series specifications.
This specification is a revision of JJG 972-2002 "Centrifugal Constant Acceleration Testing Machine". With JJG 972-2002
In comparison, the main technical changes besides editorial modifications are as follows.
---The scope has been modified according to the classification of centrifugal constant acceleration testing machines (see Chapter 1);
---Modified reference documents (see Chapter 2);
---Modify the term "installation calculation radius" to "working radius", and all "installation calculation radius" in the text of the regulations
Unifiedly modified to "working radius" (see 3.2);
---Modified the term "constant acceleration" (see 3.3);
---Modify "Spindle rotation speed (speed) setting value" to "Speed speed setting value", all in the text of the regulation
"Spindle rotation speed" is uniformly changed to "rotation speed" (see 3.4);
---Modify "Tangential acceleration" to "Tangential acceleration", modify "Tangential acceleration ratio" to "Tangential acceleration"
"Tangential acceleration ratio", modify "Tangential acceleration average value" to "Tangential acceleration ratio average value", modify "Tangential acceleration ratio instantaneous
time value" is "tangential acceleration ratio instantaneous value", the entire text of the regulation has been replaced, and the term "tangential acceleration" has been modified.
degree ratio” (see 3.5);
---Added the term "acceleration gradient" (see 3.6);
---Added the classification of centrifugal constant acceleration testing machines (see Chapter 4);
---The measurement performance requirements have been modified and proposed separately according to the classification of centrifugal constant acceleration testing machines (see Chapter 5);
--- Added measurement performance requirements for "acceleration stability" and "acceleration gradient" (see 5.1);
---Modify "static current collector contact resistance" to "conductive slip ring contact resistance", modify "dynamic current collector contact resistance"
"Contact resistance" is the "dynamic change amount of conductive slip ring contact resistance", adding the measurement characteristic of "conductive slip ring insulation resistance"
(see 5.1);
---Modified the temperature and humidity requirements in the "Constant Acceleration Testing Machine Working Environment" (see 6.3);
---Modified the instruments and equipment for calibration (see 7.1.2);
---Added the verification items "speed range" and "acceleration range" (see 7.2, 7.2.3 and 7.2.6);
---Added the calibration method of working radius, and selected (recommended) according to the level of centrifugal constant acceleration testing machine
Perform verification using the same method (see 7.2.2);
---Added the verification method of speed indication error, and selected different test methods according to the level of centrifugal constant acceleration testing machine
Verification method (see 7.2.4);
---Modify the verification method of rotational speed stability, and select different methods according to the level of centrifugal constant acceleration testing machine
Verification method (see 7.2.5);
---Added the verification method of acceleration indication error, and selected different methods according to the level of centrifugal constant acceleration testing machine
Calibration method (see 7.2.7);
---Added the verification method of acceleration stability, and selected different test methods according to the level of centrifugal constant acceleration testing machine
Method for verification (see 7.2.8);
---Added the verification method of tangential acceleration ratio average value, and selected according to the level of centrifugal constant acceleration testing machine
Different methods for verification (see 7.2.9.1);
---Added the verification method of the instantaneous value of tangential acceleration ratio, and selected it according to the level of centrifugal constant acceleration testing machine
Different methods for verification (see 7.2.9.2);
---Added the verification method of acceleration gradient, and selected different methods according to the level of centrifugal constant acceleration testing machine
Verification method (see 7.2.10);
---Added the verification method of insulation resistance of conductive slip rings (see 7.2.11.1);
---Modified the verification method of contact resistance of conductive slip rings (see 7.2.11.2);
---Modified the verification method of dynamic change in contact resistance of conductive slip rings (see 7.2.11.3);
---Modified the format of the inner pages of the calibration certificate (see Appendix A);
---Modified the constant acceleration testing machine calibration record (see Appendix C).
Calibration procedures for centrifugal constant acceleration testing machines
1 Scope
This procedure is applicable to centrifugal constant acceleration with an acceleration range less than 100000m/s2 and an accuracy level of 1 to 5.
Initial calibration, subsequent calibration and in-use inspection of the testing machine.
2 cited documents
JJG 1066-2011 Precision centrifuge
GB/T 2423.15-2008 Environmental testing of electrical and electronic products Part 2.Test methods Test Ga and
Guidelines. Steady State Acceleration
GB/T 5170.16-2018 Environmental test equipment inspection methods Part 16.Steady-state acceleration test
Scheming
For dated references, only the dated version applies to this regulation; for undated references, only the dated version applies.
The latest version (including all modification orders) shall apply to this regulation.
3 terms
3.1 Loadforverification for verification
The fixed mass block used for verification should have a symmetrical shape and a mass equal to the maximum load given value.
Note. The load used for verification should be reliably fixed on the work surface (or rotating arm) and should not be used when working within the specified constant acceleration range.
There should be some looseness.
3.2 working radius workingradius
The test load (including the load for verification) installed on the table (or rotating arm) of the centrifugal constant acceleration testing machine
The distance from the center to the rotation center of the constant acceleration testing machine.
3.3 constant acceleration
When the centrifugal constant acceleration testing machine rotates stably, the centripetal acceleration of the load acting on the installation table (or rotating arm)
speed.
Normally, constant acceleration can be measured directly using a reference standard accelerometer. constant acceleration
When the degree is measured by the indirect method, the constant acceleration value is calculated according to formula (1) based on the actual measured working radius and rotation speed.
a0=ω2R0=
n20R0 (1)
In the formula.
a0---acceleration,m/s2;
ω ---angular velocity, rad/s;
R0---working radius, m;
n0---actually measured spindle speed, r/min.
3.4 Speed setpoint speedsetpoint
......
Similar standards: JJG 249 JJG 404 JJG 134 |