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Why the clam jaw of UT273/UT275 earth clamp tester keeps buzzing when they are powered on?

The clamp jaw of the UT273/UT275 earth clamp tester may buzz when powered on due to its design. The test principle of an earth clamp tester involves the clamp jaw emitting a high-power magnetic field to generate current for measuring the earthed conductor. This buzzing does not affect the measurement.

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