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Can the Craftsman 73755 amp meter take accurate ac amp readings without separating the hot and neutral wires as the older catalogs stated?
Wrightequipment
A clamped- or forked-type ammeter can only measure the amps in one conductor at a time. Using it as you suggest would get a reading of 0 amps. This is because the reading of one conductor's amps cancels the other conductor's amps.
Ammeters of this type actually measure the rise and fall of the magnetic field produced by the AC current. Since electrons in one conductor are moving the opposite direction of the other conductor, the magnetic fields cancel each other.
On DC circuits, since there is no rise and fall of the magnetic field, it is constant, these type ammeters always read 0 amps on DC current.
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∙ 13y ago
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