Extech Instruments 381676A User Manual page 2

Introduction
Thank you for selecting the Extech Model 381676A. This instrument measures AC/DC Voltage
and Current, Resistance, Diode, Continuity, Logic, and includes a non‐contact Voltage Detector
(NCV). Features include MAX Hold, Data Hold, Automatic Power OFF (APO), and Auto/Manual
Range. This device is shipped fully tested and calibrated and, with proper use, will provide years
of reliable service. Please visit the Extech Instruments website (www.extech.com) to check for
the latest version of this User Guide.
Safety
WARNING: Improper use of this device can result in electric shock or damage to the
meter. Follow all safety guidelines presented in this manual and the usual safety
precautions used when working with electrical circuits.
This instrument conforms to GB/T 13978‐92 for digital Multimeter technical standards, as well
as GB4793.1‐1995 (IEC ‐61010‐1:2001) safety standards for electronic measuring instruments
with a safety category of CAT III 600V and pollution degree 2.
Preliminary Safety
When using the meter, observe all normal safety rules concerning:
 Protection against the dangers of electrical current
 Protection of the meter against misuse
When the meter is delivered, check for transit damage. When checking voltage, always test the
meter on a known live circuit first. Test leads must be in good condition. Before use, verify that
the test lead insulation is intact and free from lead wire exposure or other damage. Use only the
supplied test leads.
Safety during use
 Be sure to set the appropriate function and range before use
 Never exceed the limits indicated in the specification table of this manual.
 Never touch probes, test leads, or alligator clip when connected to live circuit.
 Do not measure voltage on terminals that exceed 600V above earth ground.
 Always use caution when working with voltages above 60VDC or 30VACrms. Keep fingers behind probe
barrier when taking measurements.
 Never connect test leads across a voltage source while the rotary switch is in the resistance, continuity, or
diode mode of operation.
 Never perform resistance, continuity, or diode tests on live circuits.
 When taking non‐contact voltage measurements ensure that the positive test lead is NOT exposed and
that the negative (common) test lead is not connected to the bottom of the meter.
 Before changing functions using the rotary function dial, be sure to disconnect the meter's test leads
from any circuit under test.
 Never use the meter in an explosive environment or where dust, dirt, or steam exists.
 Never use the meter if the housing or battery compartment is open.
 Do not store meter in direct sunlight, high temperature/humidity, or condensation.
 If the equipment is used in a manner not specified by the manufacturer, the protection provided by the
equipment may be impaired.
 ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance
or diode tests.
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