Extech 381676 Operating Manual

User's Guide

Pen Multimeter with Voltage Detector
Model 381676

Introduction

Congratulations on your purchase of the Extech Model 381676. This instrument
provides AC/DC Voltage, Resistance, Diode, & Continuity testing plus a built-in
non-contact Voltage Detector. Proper use and care of this meter will provide
many years of reliable service.

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 meter has been designed according to IEC-1010
with respect to electronic measurement instrumentation with an
overvoltage category CAT III 600V and pollution 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 that it has not been damaged in transit.
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 temp./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.

Safety Symbols

This symbol adjacent to another symbol, terminal or operating device
indicates that the operator must refer to an explanation in the Operating
Instructions to avoid personal injury or damage to the meter.

This symbol indicates that a device is protected throughout by double
insulation or reinforced insulation.

This symbol advises the user that the terminal(s) so marked must not
be connected to a circuit point at which the voltage with respect to earth
ground exceeds 600V.

This symbol indicates compliance to the European Union directive

2

381676 V2.0 06/06

Controls and Jacks

1

1. Retractable positive test lead

2. Test lead retracting nut

3. AC voltage detector and warning light

3

4. Finger protection barrier

5. Rotary function dial

5

6. Sensitivity adjustment for AC volt detector

7. RANGE button

8. FUNCTION button

7
9

9. MAX HOLD button

10. DATA HOLD button

11. Common (negative) test lead jack

12. LCD display
Note: The battery compartment is located

on the rear of the instrument

Display Symbols

11

•))) Audible Continuity V Volts

Diode function Ω Ohms

Low battery D.H Data Hold
m milli (10
k kilo (10

-3

) (volts) DC Direct current

3

) ohms AC Alte rnating current

M Meg (106) ohms M.H Maximum Hold

Max. Input Limit Specification

Measurement Input Limit

Voltage DC or AC 200mV range: 250VDC or AC

All other ranges: 600VDC or VAC

Resistance, Continuity, and Diode 250VDC or VAC

PENMUL

TIMETER+VO

L
T
AGEDETECTOR

2

4

6

8

10

12

381676

COM

3

381676 V2.0 06/06