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PFC Circuit

Power Frequency Magnetic Field Immunity Test

A power frequency magnetic field immunity test evaluates the ability of electronic equipment to withstand magnetic field disturbances at power frequencies, typically 50 Hz or 60 Hz. These disturbances can originate from power lines, transformers, or other electrical devices.

Purpose:

  • Ensure reliable operation: The test helps ensure that electronic devices can function correctly in the presence of magnetic fields that might be encountered in real-world environments.

  • Prevent malfunctions: It helps prevent malfunctions, performance degradation, or even catastrophic failures caused by external magnetic fields.

  • Compliance with standards: Many international standards, such as IEC 61000-4-8, require equipment to pass power frequency magnetic field immunity tests to ensure safety and compatibility.

 

Test Procedure:

  1. Test setup:

    • The device under test (DUT) is placed within a Helmholtz coil, which generates a uniform magnetic field.

    • The DUT is powered and operated under normal conditions.

    • Monitoring equipment is used to observe the DUT's performance and any changes during the test.

  2. Magnetic field application:

    • A power frequency magnetic field is applied to the DUT using the Helmholtz coil.

    • The magnetic field strength is gradually increased to the specified test level.

  3. Performance evaluation:

    • The DUT's performance is monitored throughout the test.

    • Any changes in performance, such as malfunctions, data errors, or loss of functionality, are recorded.

 

Test Levels:

  • Level 1: Typically not applicable.

  • Level 2: 3 A/m

  • Level 3: 10 A/m

  • Level 4: 30 A/m

  • Level 5: 100 A/m

The specific test level depends on the equipment's intended use and the applicable standards.

 

Key Considerations:

  • Test environment: The test environment should be free from other sources of electromagnetic interference.

  • Test setup: Proper grounding and shielding are essential to minimize the influence of external noise.

  • Test duration: The test duration should be sufficient to observe any potential effects of the magnetic field.

 

By conducting power frequency magnetic field immunity tests, manufacturers can ensure that their electronic equipment is robust and reliable in the face of real-world electromagnetic disturbances. All Lumsyn's air cooler controllers were tested power frequency magnetic field immunity. Please refer to the following test video

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