This standard specifies the verification items and technical requirements, verification instruments, verification methods, verification results and processing of DC resistance test devices. This standard is applicable to the verification of the measurement accuracy of laboratory DC resistance test devices. JB/T 4279.2-1994 Verification method of enameled winding wire test equipment DC resistance test device JB/T4279.2-1994 Standard download decompression password: www.bzxz.net

ICS29.060
Registration number: 23100—2008
Mechanical industry standard of the People's Republic of China JB/T4279.2—2008
Replaces JB/T4279.2—1994
Verification procedure for test equipment of enamelled winding Part 2: DC resistance test device
Verification procedure for test equipment of enamelled winding wirePart 2: DC electrical resistance tester2008-02-01 release
2008-07-01 implementation
The National Development and Reform Commission of the People's Republic of China issued Foreword,
2 Normative references
3 Verification items and technical requirements
Verification equipment
5 Verification methods.
5.1 General inspection.
5.2 Measurement of fixtures and connections
6 Processing of verification results,
Appendix A (informative appendix) Error analysis,
Appendix B (normative appendix) Contents and format of verification certificate or verification result notice of DC resistance test device JB/T4279.2-2008
JB/T4279 "Verification methods for enameled winding wire test instruments and equipment" is divided into 18 parts: Part 1 Part: General:
Part 2: DC resistance test device:
Part 3: Elongation tester;
Part 4: Rebound angle tester
Part 5: Snap break tester;
-Part 6: Peel tester:
Part 7: Electric heating forced ventilation test chamber; Part 8: Softening breakdown tester:
Part 9: One-way paint scraping tester:
- Part 10: Solvent resistance tester;
Part 11: Breakdown voltage tester:
Part 12: Low voltage paint film continuity tester:
Part 13: High voltage paint film continuity tester; Part 14: Solder tester:
Part 15: Reciprocating paint scraping tester:
Part 16: Static friction coefficient tester:
Part 17: Dynamic friction coefficient tester; Part 18: Refrigerant resistance test device. This part is the second part of JB/T4279.
This part replaces JB/T4279.2-1994 "Verification method of enameled winding wire test equipment". Compared with JB/T4279.2-1994, this part has the following main changes: In 3.2, the number of significant digits of the measured readings is specified according to the actual needs of the industry. Appendix A of this part is an informative appendix, and Appendix B is a normative appendix. This part was proposed by China Machinery Industry Federation. This part is under the jurisdiction of National Technical Committee for Standardization of Electric Wires and Cables (SAC/TC213). JB/T4279.2--2008
DC resistance test device".
Drafting units of this part: Shanghai Cable Research Institute, Xingning Jinyan Electric Co., Ltd., Hunan Aerospace Science and Technology Industry Co., Ltd. Main drafters of this part: Zhu Bing, Huang Zhongming, Ren Jingxiang. Previous versions of the standards replaced by this part: JB4279.2-1986, JB/T4279.21994. Ⅲ
1 Scope
Verification methods for enameled winding wire test equipment Part 2: DC resistance test device
JB/T4279.2—2008
This part of JB/T4279 specifies the verification items and technical requirements, verification instruments, verification methods and processing of verification results for DC resistance test devices.
This part is applicable to the verification of the measurement accuracy of laboratory DC resistance test devices. 2 Normative references
The clauses in the following documents become clauses of this part through reference in this part of JB/T4279. All subsequent amendments (excluding errata) or revisions of dated referenced documents are not applicable to this part. However, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, its latest version shall apply to this part JB/T4279.1-2008 Verification Methods for Enameled Winding Wire Test Instruments Part 1: General 3 Verification Items and Technical Requirements
3.1 The measurement accuracy of the enameled wire DC resistance test device shall not be less than 0.5%. 3.2 A DC double-arm bridge or digital micro-ohmmeter may be used. For a DC double-arm bridge, the measurement reading shall not be less than four significant digits, and the accuracy level shall not be less than 0.2: For a digital micro-ohmmeter, the measurement reading shall not be less than four significant digits, and the allowable error is ±0.2%. 3.3 The fixture and connection wire shall be:
a) The fixture shall be made of copper, brass or other metal materials with silver-plated surface. b) The two potential fixtures shall be parallel to each other and perpendicular to the longitudinal axis of the specimen. The inner distance between the potential fixtures shall be 1000mm ±1mm. c) The blade of the potential fixture should be straight, with a width of 1mm to 2mm, and the blade should be able to maintain close and good contact with the sample. d) The distance between the potential fixture and the adjacent current fixture is about 15mm to 100mm, and the fixture fixing plate should have sufficient mechanical strength. e) The resistance of the jumper wire connecting the standard resistor and the current fixture should not be greater than 0.0012f) The resistance of the wire connecting the potential fixture and the bridge should not be greater than 0.012. 3.4 The ambient temperature of the enameled wire DC resistance test device should be within the range of 15℃ to 35℃. The thermometer for measuring the sample temperature should be an experimental thermometer with a graduation value of 0.1℃ and a temperature sensing part of the thermometer placed at a distance of no more than 200mm from the sample and approximately horizontal to the sample.
4 Calibration instruments
The accuracy level of the DC double-arm bridge is not less than 0.2; or the resistance measuring instrument, the allowable error is soil 0.2%. 4.1
Vernier caliper, 1000mm, graduation value 0.1mm; or steel ruler, 1000mm, graduation value 0.5mm. 4.2
4.3Vernier caliper, 200mm, graduation value 0.02mm. 5 Verification method
5.1 General inspection
5.1.1 Check the environment where the resistance test device is placed. The resistance test device should be placed away from heat sources, not directly exposed to sunlight, and the ambient temperature does not change drastically, and the ambient temperature should be within the range of 15℃～35℃. 5.1.2 Check the verification certificate of the bridge, standard resistor or the verification certificate of the resistance measuring instrument. Check whether the additional 1
JB/T4279.2-2008
device of the bridge is qualified according to the use requirements of the bridge. The power supply of the laboratory bridge should be a battery or a constant current source. 3. For bridges used to test enameled wires with a nominal conductor diameter of 0.08 mm or less, other power sources must use adjustable current sources. 5.1.3
5.1.4. For resistance measuring instruments used to test enameled wires with a nominal conductor diameter of 0.08 mm or less, the current passing through the sample must be less than 2 mA. www.bzxz.net
Check the installation of the potential fixture and its contact with the sample. Check the calibration certificate of the thermometer and its placement. 5.2. Measurement of fixtures and connecting wires
Measure the inner distance between the blades of the two potential fixtures. 5.2.2
Measure the width of the blade of the potential fixture.
Measure the distance between the same potential fixture and the current fixture. 5.2.4
Use a DC double-arm bridge or resistance measuring instrument to measure the resistance of the jumper wire and the connecting wire. 6 Handling of verification results
6.1 A verification certificate shall be issued to qualified DC resistance test devices, and a verification result notice shall be issued to unqualified ones. The cover forms of the verification certificate and verification result notice are shown in Appendix A and Appendix B of JB/T4279.1-2008, and the content forms are shown in Appendix B. The verification cycle of DC resistance test devices is generally set at two years. 6.2
Appendix A
(Informative Appendix)
Error analysis
A.1 The relative error of the resistance measuring device is synthesized by the root mean square of the following relative errors: Note: See Appendix C (C9) of GB/T3048.2-1994 "Method for measuring the resistivity of metal conductor materials". AR,(to）
Where:
JB/T4279.2—2008
[些[]
2 +[(\-2),+[a,
+[(o -t)A(ar (o)-+[(ar (o) -)rRelative error when the sample is converted from the test temperature to the standard temperature to (20℃): AR(to)/R(to)
Relative error of the sample gauge length:
ANAB/NAB
AR(t2)/Rs(t2)-
(t'-t2)As
(r'-2)(aR(to)-)
(O(to))At
Relative error caused by bridge accuracy and measurement accuracy: Relative error of standard resistance calibration at standard temperature: Relative error of standard resistance at temperature t\ when measuring resistance; Relative error of standard resistance caused by temperature measurement and control error: The sample resistance is measured by Relative error caused by temperature correction to temperature: Relative error of sample resistance caused by temperature measurement and control error A.2 When the laboratory ambient temperature is 15℃～35℃ and the temperature measurement and control error does not exceed ±0.5℃, it is recommended that the relative errors be distributed as follows:
a) Length error ±0.1:
b) Bridge accuracy and measurement accuracy ±0.4: c) Standard resistance error ±0.01:
d) Standard resistance temperature correction error is negligible: e) Sample resistance temperature correction error is negligible: f) Error of standard resistance caused by temperature measurement and control error ±0.75×10-3g) Error of sample resistance caused by temperature measurement and control error ±0.2. Calculate according to the formula in A.1:
AR(t)/R(to)~［(0.1)2+(0.4)2+(0.01)2+(0.75×10-3)2+(0.2)2jl20.50JB/T4279.2—2008
Appendix B
(Normative Appendix)
Contents of the verification certificate or verification result notice of DC resistance test device Style Model Specification
DC bridge/resistance measuring instrument
Standard resistance
Bridge power supply
Galvanometer
Connecting wire
Thermometer
DC resistance test device verification Verification result:
Inspection result
People's Republic of China
Mechanical Industry Standard
Verification method of enameled winding wire test equipment Part 2: DC resistance test device
JB/T4279.2-2vG8
Published and distributed by Machinery Industry Press
No. 22 Baiwanzhuang Street, Beijing
Postal code: 100037
210mm×297mm0.5 printing sheet·13,000 words
July 2008 1st edition 1st printing
Price: 10.00 yuan
Book number: 1
15111 ·9025
Website: http://www.cmpbook.comEditorial phone:
Direct sales center phone:
(010)88379778
(01088379693
All covers without anti-counterfeiting labels are pirated
Copyright reserved
Infringements will be investigated
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.