Extech Instruments EX330 User manual

User's Guide

Mini Multimeter

with Non-Contact Voltage Detector (NCV)

Model EX330

EX330-EU-ENG – V4.2 1/08

Introduction

Congratulations on your purchase of the Extech EX330 Meter. The EX330 offers

AC/DC Voltage, AC/DC Current, Resistance, Diode, Continuity, non-contact

Voltage Detection, Capacitance, Frequency, Duty Cycle, and Temperature (Type

K) functions. 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

EX330-EU-ENG – V4.2 1/08

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 500mA DC/AC

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

every 15 minutes

Frequency, Resistance, Capacitance,

Duty Cycle, Diode Test, Continuity

250V DC/AC

Temperature 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.

EX330-EU-ENG – V4.2 1/08

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.

•Warning! This is a class A equipment. This equipment can cause

interferences in the living quarters; in this case the operator can be

required to carry out adequate measures.

•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.

EX330-EU-ENG – V4.2 1/08

Controls and Jacks

1. AC Voltage Detector Sensor

2. AC Voltage Detector indicator

light

3. LCD

4. RELATIVE push-button

5. MODE button

6. Non-contact AC Voltage

Detector test button

7. Rotary function dial

8. 10 ampere test lead jack

9. COM test lead jack

10. Test lead jack for voltage,

milli-amp, micro-amp,

resistance, capacitance,

frequency, and temperature

functions

11. RANGE button

12. HOLD button

13. Protective rubber holster

(must be removed to access

the rear battery compartment)

Display Symbols and Annunciators

n nano (10-9) (capacitance) µ micro (10-6) (amps, cap)

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

k kilo (103) (ohms) F Farads (capacitance)

M mega (106) (ohms) Ω Ohms

Hz Hertz (frequency) V Volts

% Percent (duty ratio) REL Relative

AC Alternating current AUTO Autoranging

DC Direct current HOLD Display hold

ºF Degrees Fahrenheit ºC Degrees Centigrade

•))) Continuity

Diode test

Battery status

EX330-EU-ENG – V4.2 1/08

Operating Instructions

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

are very dangerous and should be measured with great care.

1. ALWAYS turn the function switch to the OFF position when the meter is not in

use.

2. Press the HOLD button to freeze a displayed reading

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.

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.

EX330-EU-ENG – V4.2 1/08

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 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.

6. If the measured AC voltage exceeds the

highest range of the meter (refer to the

specification table) an audible tone will

sound.

EX330-EU-ENG – V4.2 1/08

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 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.

EX330-EU-ENG – V4.2 1/08

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 4000µA, set the function switch to the

µA position and insert the red test lead banana plug into the mA/µA jack

3. For current measurements up to 400mA, set the function switch to the

mA position and insert the red test lead banana plug into the mA/µA

jack.

4. For current measurements up to 10A, set the function switch to the 10A

range and insert the red test lead banana plug into the 10A jack.

5. Use the MODE button to select AC or DC current. The display will reflect

the selection.

6. Remove power from the circuit under test, then open up the circuit at the

point where you wish to measure current.

7. 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.

8. Apply power to the circuit.

9. Read the current in the display.

EX330-EU-ENG – V4.2 1/08

RESISTANCE MEASUREMENTS

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

test and discharge all capacitors before taking any resistance

measurements. Remove the batteries and unplug the line cords.

1. Set the function switch to the Ω position.

2. Insert the black test lead banana plug into the

negative COM jack.

Insert the red test lead banana plug into the

positive Ωjack.

3. Touch the test probe tips across the circuit or

component under test. It is best to disconnect

one side of the circuit under test so the rest of

the circuit will not interfere with the resistance

reading.

4. Read the resistance in the display.

CONTINUITY CHECK

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

wires that have voltage on them.

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. Use the MODE button to view the icon on

the display.

5. Touch the test probe tips to the circuit or

wire you wish to check.

6. If the resistance is less than approximately

100Ω, the audible signal will sound. If the

circuit is ‘open’ (bad), the display will

indicate “OL”.

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