Hogyan képes a lakatfogós multiméter megmérni az áramerősséget?

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"An AC clamp can't measure DC since it's just a transformer. You need a clamp with a Hall effect sensor mounted in its core material. "

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"A dc current flowing in a wire will have a static magnetic field surrounding it, so with a clamp on toroidal core around the wire a static magnetic field is set up in the core, if you use a linear hall effect device in the core's path you can measure the strength of this fiels and measure it...

A more accurate method would be to have a winding on the toroidal core (clamp on bit) and introduce a dc current to oppose the magnetic field until the hall effect sensor indicates zero again and then the current and turns on the core give a more precise reading of the current in the wire."

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