JB/T 6870-1993 Technical Specifications for Rotating Magnetic Field Flaw Detectors JB/T6870-1993 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Rotating Magnetic Field Flaw Detectors
Subject Content and Scope of Application
JB/T6870—93www.bzxz.net
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements for rotating magnetic field flaw detectors (hereinafter referred to as flaw detectors).
This standard applies to rotating magnetic field magnetic particle flaw detectors generated by cross yokes. 2 Reference standards
GB191 Packaging, storage and transportation pictorial marks
GB/T2611 General technical requirements for testing machines
GB6388 Shipping and receiving marks for transport packaging
JB/T6147 Technical requirements for testing machine packaging, packaging marks, storage and transportation ZBY002 Basic environmental conditions and test methods for transportation and storage of instruments and meters 3 Terms
3.1 Crossed yoke:
A magnetizing device composed of two yoke-shaped electromagnets that cross in space or cross in plane at a certain angle and are excited by two sets of alternating currents with different phases.
3.2 Effective magnetization range: The maximum magnetization area that meets the requirements of detection sensitivity. 3.3 Suction: Also known as lifting force.
The attraction between the magnetic extreme end face of the cross yoke and the flaw detection surface. Technical requirements
The flaw detector should work normally under the following environmental conditions: 4.1
Environmental temperature: 0~40℃;
Relative air humidity is not more than 80%;
The power supply voltage fluctuation shall not exceed ±10% of the rated power supply voltage; There shall be no large amount of dust, flammable or corrosive gas in the surrounding environment. The rated working voltage error of the flaw detector shall not exceed the provisions of Table 1. The phase difference between the two sets of working voltages shall be: 90°±5° or 120°±5°Table 1
Rated working voltage (V)
60
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