Simple testing of electromagnetic radiation pollution
1. Select testing instruments based on the test object and environment
When testing the electromagnetic radiation of a certain electronic or electrical equipment, attention should be paid to the following issues. Understand as much as possible the various electrical indicators and operating parameters of this electronic and electrical equipment, and on this premise, determine to use different testing instruments. Generally speaking, for electromagnetic testing in the near-field, if the testing frequency is in the short or microwave band, a domestically produced 701 3D field strength meter or other 3D field strength meters can be selected, with a testing frequency range of approximately a few hundred KHz to 1GHz. When testing substations or high-voltage and ultra-high voltage transmission lines, power frequency electromagnetic field testing equipment should be selected. When testing in the far-field area, spectrum analyzer or interference field strength tester can be selected according to different testing frequency bands. During testing, testing should be conducted in accordance with the requirements of HJ/T10.2-1996 Electromagnetic Radiation Monitoring Instruments and Methods in the Radiation Environmental Protection Management Guidelines.
2. Units of measurement used for electromagnetic radiation measurement
Usually, for microwave frequency bands greater than 300MHz, the average power density mW/cm2 is used as the measurement unit. For frequency bands less than 300MHz, the electric field strength V/m and magnetic field strength A/m are used as the measurement units. When conducting electromagnetic environment measurements, the national measurement standard for interference field strength adopts the unit of mV/m, and when expressed in decibels, 1mV/m=0dB.
