title>GB/T 3048.16-1994 Test methods for electrical properties of wires and cables - Surface resistance test - GB/T 3048.16-1994 - Chinese standardNet - bzxz.net
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GB/T 3048.16-1994 Test methods for electrical properties of wires and cables - Surface resistance test

Basic Information

Standard ID: GB/T 3048.16-1994

Standard Name: Test methods for electrical properties of wires and cables - Surface resistance test

Chinese Name: 电线电缆电性能试验方法 表面电阻试验

Standard category:National Standard (GB)

state:Abolished

Date of Release1994-05-01

Date of Implementation:1995-01-01

Date of Expiration:2008-05-01

standard classification number

Standard ICS number:Electrical Engineering >> 29.060 Wires and Cables

Standard Classification Number:Electrical Engineering>>Electrical Materials and General Parts>>K13 Cables and Accessories

associated standards

alternative situation:Replaced GB/T 3048.16-92; replaced by GB/T 3048.16-2007

Procurement status:NEQ IEC 885-2

Publication information

other information

Review date:2004-10-14

Drafting unit:Shanghai Cable Institute of the Ministry of Machinery

Focal point unit:National Wire and Cable Standardization Technical Committee

Publishing department:China Electrical Equipment Industry Association

competent authority:China Electrical Equipment Industry Association

Introduction to standards:

This standard specifies the test equipment, sample preparation, test steps, test results and calculations for the surface resistance test. This standard is applicable to the measurement of the surface resistance of wires and cables, and its measurement range is 10 to the power of 5~10 Ω. If the sample conditioning environment and test environment are different from this standard, the test results cannot be compared with the results measured in the environment specified in this standard. GB/T 3048.16-1994 Test method for electrical properties of wires and cables Surface resistance test GB/T3048.16-1994 Standard download decompression password: www.bzxz.net

Some standard content:

National Standard of the People's Republic of China
Test methods for determining electrical properties of electric cables and wiresSurface resistance test
Subject content and scope of application
This standard specifies the test equipment, sample preparation, test steps, test results and calculations for surface resistance test. This standard is applicable to measuring the surface resistance of wires and cables, and its measurement range is 105~1015α2. When the conditioning treatment environment and test environment of the sample are different from those of this standard, its test results cannot be compared with the results measured in the environment specified in this standard.
The general requirements, definitions and periodic calibration requirements for the electrical performance test of wires and cables are specified in GB/T3048.1. 2bzxz.net
Referenced Standards
GB/T3048.1 General Principles of Electrical Performance Test Methods for Wires and Cables 3 Test Equipment
3.1 Test Box
3.1.1 The test box is shown in Figure 1 and should be a transparent glass or organic glass container. The box cover and the box body must be well sealed, and the size of the box body should ensure that the sample does not touch any side of the box body. Figure 1 Schematic Diagram of Surface Resistance Test Box
1--Box cover; 2--Sample; 3--Lead wire; 4--Porcelain box; 5-Box body; 6-Na,Cr.O, saturated aqueous solution; 7-Hygrometer State Technical Supervision Bureau Approved on May 19, 1994 and implemented on January 1, 1995
GB/T3048.16-94
3.1.2 The lead wire is a high insulation resistance wire (such as polytetrafluoroethylene insulated wire). At the specified temperature and relative humidity, in the absence of a sample, the resistance between the two lead wires is at least 100 times greater than the surface resistance of the sample being tested. 3.1.3 The saturated aqueous solution of Na2Cr20 in the box is to ensure that the relative humidity in the box can be maintained at 50±5% when the test box is in an environment of 20°C.
3.1.4 If several samples are placed in the test box at the same time, the distance between the samples shall not be less than 25mm. 3.1.5 There is a hygrometer in the test box, and the relative humidity value in the box can be obtained from the outside of the test box. 3.2 Measurement system
The surface resistance test can be carried out by comparison method or by voltage-current method (or high resistance meter method). Regardless of the method used, the measurement error shall comply with the following provisions:
For the measured resistance value of 1×101°n and below, it shall not be greater than ±10%; for the measured resistance value of 1×101°α or above, it shall not be greater than ±20%. 4 Sample preparation
4.1 Cut 3 samples with complete appearance and no surface defects from the tested wires and cables. The length of the samples shall not be less than 250mm. 4.2 Use a clean, non-chipping, soft, dry, and absorbent material to wipe the sample back and forth several times for cleaning. For samples with serious contamination, wipe with alcohol and then dry.
4.3 Use a silver-plated round copper wire with a diameter of not more than 0.05mm to spirally wind two electrodes in the middle of the sample. The inner sides of the two electrodes are 50±1mm apart. The number of turns of each electrode shall not be less than 10. The electrode can also be formed by winding a clean copper foil with a width of 10mm on the sample for several turns, and then winding a round copper wire with a diameter of 0.2~0.5mm on the copper foil. 4.4 Use a clean, non-chipping, soft, dry, and absorbent material to wipe the part between the electrodes of the sample back and forth. After this cleaning treatment, the part between the electrodes of the sample is not allowed to contact any other substances except ambient air. 5 Test steps
5.1 Place the sample in the test box, and connect the electrode of the sample to one end of the lead box. 5.2 The test box is placed in an environment of 20±2℃, and the relative humidity in the box should be 50±5%. The sample is placed under this condition for at least 24 hours for conditioning. (At 20℃, above the saturated aqueous solution of Na2Cr20, the relative humidity can be maintained at 52%. Other aqueous solutions of substances can also be used, such as glycerol aqueous solution with a certain specific gravity). 5.3 Connect the end of the lead wire outside the box to the measurement system, and measure the resistance value of the middle part of the sample electrode. The test voltage is 500V. The charging time during measurement should be sufficient. Unless otherwise specified in the product standard, the charging time should be: 1min for measuring resistance values ​​of 1×1012 and below, 5min for measuring resistance values ​​of 1×1012α and above. 5.4 During measurement, the sample should be in the same environment as the conditioning treatment. 6 Test results and calculations
6.1 The middle value of the three measured surface resistance values ​​of the samples is the test result. 6.2 The surface resistivity of the sample is:
Where: P, surface resistivity, a;
R surface resistance, a;
D-diameter of the sample, mm;
R·Yuan·D
GB/T 3048.16-94
L——the distance between the inner sides of the two electrodes, mm Additional remarks:
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Shanghai Cable Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Shanghai Cable Research Institute of the Ministry of Machinery and Electronics Industry and other major drafters of this standard. Xi Jimin.
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