Power frequency magnetic field test
  • Power frequency magnetic field test

Power frequency magnetic field test


In the current flow through the place will be accompanied by magnetic field, in order to check the equipment or system in the vicinity of the power frequency magnetic field, the resistance to magnetic field disturbance.

Power frequency magnetic field test

Power frequency magnetic field immunity test, which can be used to evaluate the performance of household, commercial and industrial electrical and electronic equipment in power frequency (continuous and short-term) magnetic field, especially suitable for computer monitors, watt-hour meters and other types of magnetic field sensitive equipment magnetic field immunity test.

Test Principle

Power frequency magnetic field immunity test, which can be used to evaluate the performance of household, commercial and industrial electrical and electronic equipment in power frequency magnetic field (continuous and short), especially suitable for computer monitors, watt-hour meters and other types of magnetic field sensitive equipment magnetic field immunity test. The power frequency magnetic field is generated by the power frequency current in the conductor, or a very small amount of it is generated by other nearby devices (such as the leakage flux of a transformer). The characteristics of the power frequency magnetic field are low frequency, long wavelength, and its test waveform is a power frequency sine wave, which can cause different degrees of influence on various electrical and electronic equipment. For example, watt-hour meter products, under the action of power frequency magnetic field, may produce program disorder, memory data loss and meter error and other malfunctions.

Test Purpose

Power frequency magnetic field immunity is used to evaluate the performance of household, commercial and industrial electrical and electronic equipment in power frequency magnetic field (continuous and short time), especially for the magnetic field immunity performance evaluation of a class of magnetic field sensitive equipment such as computer monitors and watt-hour meters.

Applicable Products

Household, commercial and industrial electrical and electronic equipment.

Picture Name

Applicable Standards

Power frequency magnetic field test

IEC/EN 61000-4-8,GB/T 17626.8 Power frequency magnetic field

IEC 61000-4-8/GB T 17626.8: Power frequency magnetic field immunity test

The power frequency magnetic field is generated by the power frequency current in the conductor near the equipment or the disturbance generated by the leakage of the transformer nearby. For the power frequency magnetic field generated by the conductor nearby, it is divided into two situations:

Under normal operating conditions, a stable magnetic field with a small amplitude is generated.

The current under fault conditions produces a magnetic field of high amplitude and short duration, which may cause protection devices, such as fuses, to operate.

detection technology

When the laboratory simulates the power frequency magnetic field and pulse magnetic field test, the corresponding voltage signal is generated by the signal source, and the signal is transmitted to the 1m x 1m magnetic field coil through the current transformer, thus generating the standard magnetic field for testing.

Tianhai detection PFMF test system adopts 3C test's new test system MFS 400 & MFT 400, with test magnetic field strength: 1-100A/m (continuous test),100-400A/m (1-10s), which can meet the new version of PFMF test.

Tianhai Testing Laboratory


Tianhai testing is set up and operated in accordance with the laboratory accreditation system specification ISO 17025. The testing instruments are made up of Germany's Rohde & Schwarz, Switzerland's EMTEST, YYOKOGAWA, Agilent, Tektronix and other world's top instrument manufacturers. The equipment is advanced and sophisticated, the site environment control is reliable, traceability is strong, the technical team is senior and efficient, and close cooperation with international authoritative organizations is maintained.

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China National Accreditation Committee for Conformity Assessment Laboratory Accreditation (CNAS), Inspection and Testing Agency Qualification Certificate (CMA), American Laboratory Accreditation Association (A2LA); Government-approved third-party testing service agencies, in strict accordance with national standards for testing, issued a report with legal effect.

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Has EMC electromagnetic compatibility, safety laboratory, 966 anechoic chamber, automotive electronics laboratory, medical electronics testing laboratory, 5G RF CCC laboratory, RF laboratory, private anechoic chamber laboratory, providing a wide range of testing; The laboratory has won CMA, CNAS, A2LA and other qualifications;

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15 years of industry experience, deep-rooted in the field of electromagnetic compatibility, efficient solution to product electromagnetic compatibility and other issues; National high-tech enterprise, with CMA and CNAS certificates, has been recognized by UL, TUV, Intertek, TIMCO, FCC, EMCC, NEMKO, SGS, etc. in the United States, serving the world.

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