Extech Instruments EX310 User manual

User's Guide

Mini Multimeter

with Non-Contact Voltage Detector (NCV)

Model EX310

Model EX310-EU-ENG – V7.2– 05/2008

Introduction

Congratulations on your purchase of the Extech EX310 MultiMeter. The EX310

offers AC/DC Voltage, AC/DC Current, Resistance, Diode, and 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

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 WARNING symbol indicates a potentially hazardous

situation, which if not avoided, could result in death or

serious injury.

This CAUTION symbol indicates a potentially hazardous

situation, which if not avoided, may result damage to the

product.

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 adjacent to one or more terminals identifies

them as being associated with ranges that may, in normal

use, be subjected to particularly hazardous voltages. For

maximum safety, the meter and its test leads should not

be handled when these terminals are energized.

This symbol indicates that a device is protected

throughout by double insulation or reinforced insulation.

WARNING

CAUTION

MAX

600V

Model EX310-EU-ENG – V7.2– 05/2008

SAFETY INSTRUCTIONS

This meter has been designed for safe use, but must be operated with caution.

The rules listed below must be carefully followed for safe operation.

1. NEVER apply voltage or current to the meter that exceeds the specified maximum:

Input Protection Limits

Function Maximum Input

V DC or V AC 600V AC and DC

mA AC/DC 200mA DC/AC

A AC/DC 10A DC/AC (for 30 seconds max. every 15

mins.)

Resistance, Diode Test,

Continuity

250V DC/AC

2. USE EXTREME CAUTION when working with high voltages.

3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 600V above earth

ground.

4. NEVER connect the meter leads across a voltage source while the function switch is in the

current, resistance, or diode mode. Doing so can damage the meter.

5. ALWAYS discharge filter capacitors in power supplies and disconnect the power when

making resistance or diode tests.

6. ALWAYS turn off power and disconnect test leads before opening the covers to replace the

fuse or battery.

7. NEVER operate the meter unless the back cover and the battery and fuse covers are in

place and fastened securely.

8. If the equipment is used in a manner not specified by the manufacturer, the protection

provided by the equipment may be impaired.

Model EX310-EU-ENG – V7.2– 05/2008

CAUTIONS

•Improper use of this meter can cause damage, shock, injury or death.

Read and understand this user manual before operating the meter.

•Always remove the test leads before replacing the battery or fuses.

•Inspect the condition of the test leads and the meter itself for any

damage before operating the meter.

•Use great care when making measurements if the voltages are greater

than 25VAC rms or 35VDC. These voltages are considered a shock

hazard.

•Always discharge capacitors and remove power from the device under

test before performing Diode, Resistance or Continuity tests.

•Voltage checks on electrical outlets can be difficult and misleading

because of the uncertainty of connection to the recessed electrical

contacts. Other means should be used to ensure that the terminals are

not "live".

•If the equipment is used in a manner not specified by the manufacturer,

the protection provided by the equipment may be impaired.

•This device is not a toy and must not reach children’s hands. It contains

hazardous objects as well as small parts that the children could swallow.

In case a child swallows any of them, please contact a physician

immediately

•Do not leave batteries and packing material lying around unattended;

they can be dangerous for children if they use them as toys

•In case the device is going to be unused for an extended period of time,

remove the batteries to prevent them from training

•Expired or damaged batteries can cause cauterization on contact with

the skin. Always, therefore, use suitable hand gloves in such cases

•See that the batteries are not short-circuited. Do not throw batteries into

the fire.

Model EX310-EU-ENG – V7.2– 05/2008

Controls and Jacks

1. AC Voltage Detector Sensor

2. AC Voltage Detector indicator light

3. LCD

4. Non-contact AC Voltage Detector

test button

5. Rotary function dial

6. 10 ampere test lead jack

7. COM test lead jack

8. Test lead jack for voltage, milliamp,

resistance/continuity, and diode

functions

9. Protective rubber holster (must be

removed to access the rear battery

compartment)

Symbols

•))) Continuity

Diode

Battery status

m milli (10-3) (volts, amps)

k kilo (103) (ohms)

V Volts

A Amps

Ω Ohms

AC Alternating current

DC Direct current

V/ /mA

CATII-600V

EX310

MultiMeter

Model EX310-EU-ENG – V7.2– 05/2008

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.

NON-CONTACT AC VOLTAGE DETECTOR

The EX310 can detect the presence of AC voltage (from 100 to 600VAC) simply

by being held very near to a voltage source.

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 battery is fresh by confirming characters appear on the LCD when the

function dial is turned to any position. Do not attempt to use the meter as an AC

Voltage Detector if the battery is weak or bad.

NON-CONTACT VOLTAGE (NCV)

The NCV function works on any rotary switch position.

1. Test the detector on a known live circuit before use.

2. Press and hold the NCV button for the duration of

the test. The meter will beep once when the button

is pushed.

3. Hold the top of the meter very close to the voltage

source as shown.

4. If voltage is present, the rim of the LCD display will

flash a bright orange and an audible warning will

sound.

Model EX310-EU-ENG – V7.2– 05/2008

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 on it. 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 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 switch to the 600 VAC

position.

2. Insert the black test lead banana plug into

the negative COM jack. Insert red test lead

banana plug into the positive Vjack.

3. Touch the black test probe tip to the

neutral side of the circuit.

4. Touch the red test probe tip to the “hot”

side of circuit.

5. Read the voltage in the display.

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 switch to the highest VDC

position.

2. Insert the black test lead banana plug into the

negative COM jack.

Insert the red test lead banana plug into the

positive Vjack.

3. Touch the black test probe tip to the negative

side of the circuit. Touch the red test probe

tip to the positive side of the circuit.

4. Read the voltage in the display. Move the

function switch to successively lower VDC

positions to obtain a higher resolution reading.

Model EX310-EU-ENG – V7.2– 05/2008

BATTERY VOLTAGE TEST

CAUTION: Do not measure batteries while they are installed in the devices

they are powering. The batteries must be removed from installations before

tests can be made.

1. Set the function switch to the 1.5V or 9V

BAT switch position. Use the 1.5V position

for ‘AAA’, ‘AA’, ‘C’, ‘D’, and other 1.5V

batteries. Use the 9V position for square 9V

transistor batteries.

2. Insert the black test lead banana plug into

the negative COM jack.

Insert the red test lead banana plug into the

positive Vjack.

3. Touch the black test probe tip to the negative

side of the battery. Touch the red test probe

tip to the positive side of the battery.

4. Read the voltage in the display.

AC / DC CURRENT MEASUREMENTS

CAUTION: Do not make current measurements at 10 Amps for longer than

30 seconds. Exceeding 30 seconds may cause damage to the meter and/or

the test leads.

1. Insert the black test lead banana plug into the negative COM jack.

2. For current measurements up to 200mA AC or DC, set the function

switch to the 200m AAC or ADC position and insert the red test lead

banana plug into the mA jack.

3. For current measurements up to 10A AC or DC, set the function switch

to the 10A AAC or 10A ADC position and insert the red test lead banana

plug into the 10A jack.

4. Remove power from the

circuit under test, then open

up the circuit at the point

where you wish to measure

current.

5. Touch the black test probe

tip to the negative side of the

circuit. Touch the red test

probe tip to the positive side

of the circuit.

6. Apply power to the circuit.

7. Read the current in the

display.

1.50

V/ /mA

CATII - 600V

EX310

MultiMeter

Model EX310-EU-ENG – V7.2– 05/2008

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 highest Ω position.

2. Insert the black test lead banana plug into the negative COM jack.

3. Insert the red test lead banana plug into the

positive Ωjack.

4. Touch the test probe tips across the circuit or

part under test. It is best to disconnect one side

of the part under test so the rest of the circuit

will not interfere with the resistance reading.

5. Read the resistance in the display. Move the

function switch to successively lower Ω

positions to obtain a higher resolution reading.

CONTINUITY CHECK

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

that have a voltage potential.

1. Set the function switch to the

position.

2. Insert the black lead banana plug into the

negative COM jack.

3. Insert the red test lead banana plug into

the positive Ωjack.

4. Touch the test probe tips to the circuit or

wire you wish to check.

5. If the resistance is less than

approximately 100Ω, the audible signal

will sound. If the circuit is open, the

display will indicate “1___”.

Model EX310-EU-ENG – V7.2– 05/2008

DIODE TEST

1. Set the function switch to the

position.

2. Insert the black test lead banana plug

into the negative COM jack and the red

test lead banana plug into the positive

jack.

3. Touch the test probes to the diode

under test.

4. A good diode will indicate approx. 700

ohms for the forward test and “1___”

for the reverse test.

5. A shorted diode will indicate the same

value of resistance in both the reverse

and forward test directions. An open

diode will indicate “1___” in both test

directions.

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