Extech Instruments 381676 User 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.

381676 V2.0 06/06

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

381676 V2.0 06/06

COM

PEN MU L

TIMETER+VO L

TAGE DETECTO R

381676

Controls and Jacks

1. Retractable positive test lead

2. Test lead retracting nut

3. AC voltage detector and warning light

4. Finger protection barrier

5. Rotary function dial

6. Sensitivity adjustment for AC volt detector

7. RANGE button

8. FUNCTION button

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

•))) Audible Continuity V Volts

Diode function Ω Ohms

Low battery D.HData Hold

m milli (10-3) (volts) DC Direct current

k kilo (103) ohms AC Alternating current

M Meg (106) ohms M.HMaximum 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

381676 V2.0 06/06

Operating Instructions

WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are

very dangerous and should be measured with great care.

NOTE: On some low AC and DC voltage ranges, with the test leads not

connected to a device, the display may show a random, changing reading. This

is normal and is caused by the high-input sensitivity. The reading will stabilize

and give a proper measurement when connected to a circuit.

NOTE: The supplied black test leads (standard test lead and alligator clip probe)

have protective plugs that must be removed before being inserted in the bottom

of the meter. The protective apparatus must be removed from the end of the

lead that plugs into the meter.

NON-CONTACT AC VOLTAGE DETECTOR

WARNING: Test the AC voltage detector on a known live circuit before each

use.

WARNING: Before using the meter in the AC Voltage Detector mode, verify that

the batteries are fresh by confirming characters appear on the LCD when the

function dial is turned to the voltage (V) position. Do not attempt to use the

meter as an AC Voltage Detector if the batteries are weak or bad.

With the function switch set to the NCV position, this instrument can detect the

presence of AC voltage (from 50 to 600VAC) simply by being held very near to a

voltage source. The NCV function works when the meter’s function dial is placed in

the NCV position only.

1. Ensure that the retractable test lead is fully

retracted.

2. Disconnect the common (negative) test

lead from the bottom of the meter.

3. Put the function switch to NCV position.

4. Test the detector on a known live circuit.

5. Hold the top of the meter very close to the

voltage source as shown.

6. Adjust the sensitivity dial to the highest

sensitivity position (fully counter-clockwise) and then lower the sensitivity as

required.

7. If voltage is present, the light at the top of the meter will flash and the alarm

will sound.

381676 V2.0 06/06

AC VOLTAGE MEASUREMENTS

WARNING: Risk of Electrocution. The probe tips may not be long enough to

contact the live parts inside some 240V outlets for appliances because the

contacts are recessed deep in the outlets. As a result, the reading may show 0

volts when the outlet actually has voltage present. Make sure the probe tips are

touching the metal contacts inside the outlet before assuming that no voltage is

present.

CAUTION: Do not measure AC voltage if a motor on the circuit is being

switched ON or OFF. Large surges may occur that can damage the meter.

1. Set the function dial to the V

position.

2. Use the FUNC button to select

AC.

3. Insert the black test lead banana

plug into the negative jack at the

bottom of the meter.

4. Unscrew the retracting nut

(clockwise) to draw out the

positive test lead.

5. Touch the black test probe tip to

the neutral side of the circuit.

6. Touch the positive test probe tip to the “hot” side of circuit.

7. Read the voltage on the display. The meter automatically selects the

optimum range or the user may manually select a range using the RANGE

button.

DC VOLTAGE MEASUREMENTS

CAUTION: Do not measure DC voltages if a motor on the circuit is being

switched ON or OFF. Large voltage surges may occur that can damage the

meter.

1. Set the function dial to the Vposition.

2. Use the FUNC button to select DC.

3. Insert the black test lead banana plug

into the negative jack at the bottom of

the meter.

4. Carefully turn the positive test lead

retracting nut (located at the top of the meter) clockwise to completely

draw out the positive test lead probe.

5. Touch the black test probe tip to the negative side of the circuit.

6. Touch the positive test probe tip to the positive side of the circuit.

7. Read the voltage on the display. The meter automatically selects the

optimum range or the user may manually select a range using the RANGE

button.

381676 V2.0 06/06

RESISTANCE MEASUREMENTS

WARNING: To avoid electric shock, disconnect power to the unit under test and

discharge all capacitors before taking any resistance measurements.

1. Set the function switch to the Ω position.

2. Use the FUNC button to select the resistance mode Ω.

3. Insert the black test lead banana plug into the negative jack at the bottom

of the meter.

4. Carefully turn the test lead retracting nut (located at the top of the meter)

clockwise to completely draw out the positive test lead probe.

5. Touch the test probe tips across the

circuit or part under test. It is best to

disconnect one side of the part under

test from the circuit so the rest of the

circuit will not interfere with the

resistance reading.

6. Read the resistance on the display. The meter automatically selects the

optimum range or the user may manually select a range using the

RANGE button.

AUDIBLE CONTINUITY CHECK

WARNING: To avoid electric shock, never measure continuity on circuits that

have a voltage potential.

1. Set the function switch to the Ω position.

2. Use the FUNC button to select the audible continuity mode

3. Insert the black test lead banana plug into

the negative jack at the bottom of the meter.

4. Carefully turn the test lead retracting nut

(located at the top of the meter) clockwise to

completely draw out the positive test lead

probe.

5. Touch the test probe tips to the circuit or wire under test.

6. If the resistance is less than approximately 50Ω, the audible tone will

sound. If the circuit is open, the display will indicate “OL”.

DIODE TEST

1. Set the function switch to the Ωposition.

2. Use the FUNC button to select the diode function

3. Insert the black test lead banana plug into the negative (common) jack at

the bottom of the meter.

4. Carefully turn the test lead retracting nut (located at the top of the meter)

clockwise to completely draw out the positive test lead probe.

5. Touch the test probes to the diode under

test.

6. A good diode will indicate approx. 0.3V

(germanium diodes) to 0.7V (silicon

diodes) for the forward test and “OL” for

the reverse test.

7. A shorted diode will indicate the same

value of voltage in both the reverse and forward test directions. An open

diode will indicate “OL” in both test directions.

381676 V2.0 06/06

Support line (781) 890-7440

Technical support: Extension 200; E-mail: [email protected]

Repair & Returns: Extension 210; E-mail: [email protected]

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

For up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA02451

DATA HOLD Button

To freeze a displayed reading, press the DATA H button. The reading will freeze

and the D.Hdisplay icon will be visible on the LCD. To release the display, press

the DATA H button again. The DH indicator will switch off and the display will

again show real time readings.

MAXIMUM HOLD Button

To display only the highest reading, press the MAX H button. The M.Hdisplay

icon will be visible on the display while in the Max Hold mode. Now, the display

will only change when a higher reading than the displayed reading is

encountered. To return to normal operation, press the MAX H button again (the

MH display icon will switch off).

FUNC (Function) BUTTON

The FUNC (function) button is used to select AC or DC while in the VOLTAGE

(V) mode. The FUNC button is also used to select diode , Continuity , or

Resistance Ωwhile in the Ωmode.

RANGE Button

The meter automatically selects the optimum range; however, the meter’s

ranges can be selected manually. When using the RANGE button to manually

select a range, start with the highest range and then select successively lower

ranges until the desired range is reached. The decimal place will move with each

press of the RANGE button.

Automatic Power OFF

The meter is equipped with an automatic power off feature to preserve battery

energy. After 15 minutes of inactivity, the meter will automatically turn off. To

turn the meter on again, simply rotate the function switch to the desired function.

381676 V2.0 06/06

Maintenance

WARNING: To avoid electrical shock, disconnect the test leads from any

source of voltage before removing the back cover or the battery cover.

WARNING: To avoid electrical shock, do not operate the meter until the battery

cover is in place and fastened securely.

This meter was designed to provide years of dependable service. However, if the

following guidelines are not followed, the dependability of the meter can be

compromised:

1. KEEP THE METER DRY. If it gets wet, wipe it off and allow it to dry before

use.

2. USE AND STORE THE METER IN NORMAL TEMPERATURES.

Environmental extremes can shorten the life of the electronic parts and

distort or melt plastic parts.

3. HANDLE THE METER GENTLY AND CAREFULLY.

4. KEEP THE METER CLEAN. Wipe the case occasionally with a damp cloth.

Do not use chemicals, cleaning solvents, abrasives, or detergents.

5. USE ONLY FRESH BATTERIES OF THE RECOMMENDED SIZE/TYPE.

6. IF THE METER IS TO BE STORED FOR A LONG PERIOD REMOVE THE

BATTERIES

Battery Replacement

WARNING: To avoid electrical shock, disconnect the test leads from any source of voltage before

removing the battery cover. Do not operate meter unless the batteries are in place.

1. The icon will appear when battery voltage is low.

2. Turn the Function dial to the OFF position.

3. Disconnect the negative (common) test lead from the meter.

4. Fully retract the positive test lead probe.

5. Remove the Phillips head screw at the rear center of the meter housing.

6. Remove the battery compartment cover to access the batteries.

7. Replace the two (2) 1.5V ‘AAA’ batteries observing polarity.

8. Secure the battery compartment cover.

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in

parts and workmanship for one year from date of shipment (a six month limited warranty applies

on sensors and cables). If it should become necessary to return the instrument for service

during or beyond the warranty period, contact the Customer Service Department at (781) 890-

7440 ext. 210 for authorization or visit our website at www.extech.com. A Return Authorization

(RA) number must be issued before any product is returned to Extech. The sender is

responsible for shipping charges, freight, insurance and proper packaging to prevent damage in

transit. This warranty does not apply to defects resulting from action of the user such as misuse,

improper wiring, operation outside of specification, improper maintenance or repair, or

unauthorized modification. Extech specifically disclaims any implied warranties or

merchantability or fitness for a specific purpose and will not be liable for any direct, indirect,

incidental or consequential damages. Extech's total liability is limited to repair or replacement of

the product. The warranty set forth above is inclusive and no other warranty, whether written or

oral, is expressed or implied.

381676 V2.0 06/06

Specifications

Function Range Resolution Accuracy

Non-contact AC

Voltage detector

(NCV)

50 to 600V NA

200mV 0.1mV

2.000V 1mV

20V 0.01V

200V 0.1V

DC Voltage

(VDC)

600V 1V

±(0.7% reading + 2 digits)

200mV 0.1V

2.000V 1mV

20V 0.01V

200V 0.1V

±(0.8% reading + 3 digits)

AC Voltage (VAC)

(40 – 400Hz)

600V 1V ±(1.0% reading + 3 digits

200Ω0.1Ω±(1.0% of reading + 3 digits)

2kΩ0.001kΩ

20kΩ0.01kΩ

200kΩ0.1kΩ

2MΩ0.001MΩ

±(1.0% of reading + 1 digit)

Resistance

(open circuit

voltage: 0.25V)

20MΩ0.01MΩ±(1.0% of reading + 5 digits)

Accuracy Notes: Accuracy specifications consist of two elements:

•(% reading) – This is the accuracy of the measurement circuit

•(+ digits) – This is the accuracy of the analog to digital converter

Accuracy is stated at 65oF to 83oF (18oC to 28oC) and less than 75% RH

General Specifications

Diode Test: Forward DC bias Current: 1mA approx.;

Reverse DC bias voltage: 1.5V approx.

Overload protection: 250VDC or ACrms

Continuity Check Audible signal will sound if the resistance is less than 50Ω

Open circuit voltage: 0.5V; Overload protection: 250VDC or AC

Display 2000 count (0 to 1999) LCD

Input Impedance 10MΩ, AC & DC Voltage

Over-range indication ‘OL’ is displayed

Auto Power Off After 15 minutes (approx.) of inactivity

Polarity Automatic (no indication for positive readings)

Minus (-) sign for negative readings.

Measurement Rate 2 times per second, nominal

Low Battery Indication “ ”is displayed to alert battery replacement

Batteries Two (2) 1.5V ‘AAA’ batteries

Operating Temperature 41ºF to 104ºF (5ºC to 40ºC)

Storage Temperature -4oF to 140oF (-20oC to 60oC)

Operating Humidity Max 80% up to 87ºF (31ºC) decreasing linearly to 50% at

104ºF(40ºC)

Storage Humidity <80%

Operating Altitude 6560ft. (2000meters) operating

Weight / Size 3.9oz (110g) / 8.2 x 1.5 x 1.1“(208 x 38 x 29mm)

Safety For indoor use and in accordance with the requirements for double

insulation to IEC1010-1 (1995): EN61010-1 (1995) Overvoltage

Category III, Pollution Degree 2.

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