380900-EN v3.1 07/13
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Introduction
Congratulations on your purchase of the Extech 380900 Dual Channel, Datalogging, True RMS
MultiMeter. This 60,000 count meter features dual input channels with dual display for measuring
two voltages or voltage and current simultaneously. Additional measurements include
Capacitance, Frequency, Resistance, Continuity, Duty Cycle and Diode test. Over 10,000
measurement readings on both channels can be logged by the meter and later transferred to PC
using the RS-232 interface. Real-time meter/PC logging is also supported. This meter is shipped
fully tested and calibrated and, with proper use, will provide years of reliable service.
Safety
International Safety Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must refer to
the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use, hazardous
voltages may be present
Double Insulation or Reinforced insulation
OVERVOLTAGE CATEGORY III
This meter meets the IEC 610-1-95 standard for OVERVOLTAGE CATEGORY III. Cat III meters are
protected against overvoltage transients in fixed installation at the distribution level. Examples
include switches in the fixed installation and some equipment for industrial use with permanent
connection to the fixed installation.
