This standard specifies the measuring instruments and materials, measuring requirements and measuring steps for the resistance of the static-conducting ground and table of the detonator production line. This standard is applicable to the measurement of the resistance of the static-conducting ground and table of the detonator production line. MT/T 690-1997 Determination method of the resistance of the static-conducting ground and table of the detonator production line MT/T690-1997 Standard download decompression password: www.bzxz.net

MT/T690—1997
This standard is formulated for the determination of the resistance value of the static conductive ground and table of the detonator production line. This standard is proposed by the Science and Technology Education Department of the Ministry of Coal Industry. This standard is under the jurisdiction of the Blasting Technology and Explosives Sub-Technical Committee of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. The drafting units of this standard are: Fushun Branch of the China Coal Research Institute and No. 525 Guang of the Zibo Mining Bureau. The drafters of this standard are: Xu Qilin, Fu Baocan, Cui Yingwen, Wang Chunle, and Xie Yizhong. This standard is entrusted to Fushun Branch of the China Coal Research Institute for interpretation. 669
1 Scope
Coal Industry Standard of the People's Republic of China
Determination of resistance on ground and mesa conducting statistical electricity in detonator production lineMT/T 690—1997
This standard specifies the instruments and materials, measurement requirements and measurement steps for the measurement of the resistance on ground and mesa conducting statistical electricity in detonator production line. This standard is applicable to the measurement of the resistance on ground and mesa conducting statistical electricity in detonator production line. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB4385--84 Technical requirements for anti-static shoes and conductive shoes GB12014--89 Anti-static work clothes
MT520-1995 Anti-static safety regulations for coal mine detonator manufacturers 3 Method summary
Connect the positive pole of the megohmmeter to the measuring electrode, the negative pole to the ground, and measure the resistance between the measuring electrode and the ground. 4
Instruments and materials
4.1 Instruments
500V megohmmeter: The measuring range is 1×102Q~1×1012Q, and the accuracy is ±5%. 4.2 Materials
a) Main electrode: chrome-plated cylindrical brass electrode. Diameter: 60mm±0.01mm, mass: 2kg (including handle), the surface roughness of the bottom of the electrode is 1.6μm.
b) Gasket: sponge gasket. Diameter: 60mm, thickness: 5mm~6mm, p=10~1022*cm, hardness: Shore 40~～50. The measuring electrode composed of items a and b is shown in the figure. Approved by the Ministry of Coal Industry of the People's Republic of China on December 30, 1997 670
Implementation on July 1, 1998
MT/T 690
1—Handle; 2—Main electrode, 3—Gasket
Figure 1 Schematic diagram of measuring electrodewww.bzxz.net
c) Connecting wire: Use polyethylene sheathed multi-strand copper wire with a cross-sectional area of ​​1.5mm2. The insulation resistance of the wire should not be less than 5×10°0.
5 Measurement requirements
5.1 The measurement must be carried out after stopping production and cleaning up products and dangerous goods. 5.2 During the measurement, the line connection should be safe and reliable to prevent sparks during the measurement process. 5.3 If there is flammable and explosive gas dust in the room, it is strictly forbidden to measure. 5.4 During measurement, an insulating board should be placed under the instrument. 5.5 Measurements are strictly prohibited during thunderstorms.
5.6 The measuring personnel should wear anti-static work clothes that meet the requirements of GB12014 and anti-static shoes that meet the requirements of GB4385. 5.7 For every 10m2 of the production workshop, there should be no less than 5 measuring points. For a floor or table with an area of ​​less than 10m2 or an independent area, 5 measuring points are appropriate.
6 Measurement steps
6.1 Before measurement, if there is oil on the floor, it must be cleaned with water or neutral detergent. During measurement, the floor or work table should be in a dry and clean state.
6.2 Moisten the sponge gasket with water.
6.3 Select any point on the conductive floor or work table. a) For conductive floors or tables paved with non-flexible materials (such as fiberglass, etc.), a moistened and wrung-out sponge gasket should be placed under the main electrode during measurement.
b) For conductive floors or tables paved with flexible materials (such as conductive rubber sheets, etc.), sponge gaskets may not be placed under the main electrode during measurement.
6.4 Connect the "line" terminal of the megohmmeter to the electrode with a wire, and connect the "ground" terminal to the grounding network of the static conductive floor with a wire, and then measure the resistance value, which is the resistance value to ground of the measurement point. 7 Measurement object
Measure the resistance of the electrode to ground according to the process classification specified in Chapter 3 of MT520. 8 Results
8.1 The data read should be retained to one decimal place. 8.2 When measuring the resistance values ​​of several points at the same place, the highest value is the resistance value of the floor or table within the measurement range. 671
Test report
The test report must include the following contents:
a) Measurement time;
b) Measurement temperature and humidity conditions;
c) Instrument name and model used
d) Measurement location;
e) Measured pole-to-ground resistance value.
MT/T 690—1997
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