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A magnetic field, proportional to the magnitude of current, surrounds all current carrying conductors. In an AC circuit the magnetic field will induce a current in the jaws of a clamp-on current probe when the jaws are closed around the conductor. If both conductors of the circuit are enclosed by the jaws of the probe the magnetic fields will cancel and no measurement is possible. Most 120 V AC appliances use two conductor cords which make it difficult to isolate a single conductor for measurement. The ALS-1 provides temporary separation of conductors to facilitate measurement of current.
Example: With the range switch of the clamp-on current probe set to 6 AMPS, the meter indicates 5.4 amps, and the jaws of the probe are through the X10 section of the ALS-1. The actual current is 0.54 amps (5.4 amps ÷ 10 = 0.54 amps, or 540 mA).