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380976 V3.1 6/08
2
Introduction
Congratulations on your purchase of the Extech 380976 Power Clamp-On Meter. This
device measures 1Φ/3Φ Power (True, Apparent, and Reactive), Horsepower, Phase
Angle, True RMS Current/Voltage, Resistance, Capacitance, Frequency, & Temperature.
Power measurements can be achieved on 3- or 4-wire configurations. Please read the
entire manual to get the most from the meter’s wide array of capabilities. This meter is
shipped fully tested and calibrated and, with proper use, will provide years of reliable
service.
Table of Contents
Warranty...................................................................................................................................3
Safety Information...................................................................................................................3
Meter Description....................................................................................................................4
AC + DC Voltage Measurements............................................................................................5
AC Current Measurements.....................................................................................................5
1Φ KW, KVA, KVAR, Power Factor & Phase Angle Measurement .....................................6
3Φ 3-Wire KW, HP, KVA, KVAR, Power Factor & Phase Angle Measurement ..................7
3Φ 4-Wire KW, HP, KVA, KVAR, Power Factor & Phase Angle Measurement ................10
Resistance and Audible Continuity Measurements...........................................................13
Capacitance Measurements.................................................................................................14
Diode Tests............................................................................................................................14
Temperature Measurements ................................................................................................14
AC and DC
µA
Current Measurements................................................................................14
Meter Control Keys ...............................................................................................................15
Automatic Sleep Mode and Battery Replacement .............................................................16
Specifications........................................................................................................................17
Calibration, Repair, and Technical Support Services........................................................20