The AEMC 566 (2139.83) True-RMS AC Clamp-On Leakage Current Meter is designed to measure low AC currents which are typically leakage currents in ground conductors. Low currents are measured in both the 60 milliamp and 600 milliamp ranges. When measuring milliamps, the high sensitivity of the probe-- 1, 10, and 100 microamps resolution-- should be noted. This resolution is possible through special jaw construction and in particular critical shielding of the jaws. At low measurement levels, shielding out noise is critical for low sensitivity, accuracy, and stability.

Leakage current may be measured on a ground conductor and through the vector sum on multiconductors. On a grounded system, clamp around the two or three conducting legs-- not the ground conductor. The vector sum of the load currents will cancel out and leave the leakage current measured.

This unit can also be used as a standard clamp-on meter to 60 amps RMS, plus standard VAC and VDC ranges, resistance, and continuity with a buzzer. In mAAC and AAC, the user can activate a Low-Pass Filter (LPF) to ignore all currents other than 50 or 60 hertz. In this mode, only the fundamental signal is measured. The AEMC 566 (2139.83) True-RMS AC Clamp-On Leakage Current Meter is ergonomic in design and fits well in the hand with one-handed operation possible. The jaw size is compact yet designed to accommodate most known ground conductors up to 0.91 inches in diameter.