Extech Extech EX330-NIST Manual

User Guide

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Mini Multimeter

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with Non-Contact Voltage Detector (NCV)

Model EX330

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.

WARNING

CAUTION

MAX
600V

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.

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 appl

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

Frequency, Resistance, Capacitance, Duty
Cycle, Diode Test, Continuity

Temperature 250V DC/AC

2. USE EXTREME CAUTION when working with high voltages.

DO N

3.
ground.

4. NEVER connect the meter leads
current, r

5. AL
resistance or diode tests.

AL

6.
or batte

7. NEVER operate
and fastened securel

y voltage or current to the meter that exceeds the specified maximum:

Input Protection Limits

Function Maximum Input

minutes

250V DC/AC

OT measure voltage if the voltage on the "COM" input jack exceeds 600V ab

across a voltage source while the function sw

ove earth

itch is in the

esistance, or diode mode. Doing so can damage the meter.

WAYS discharge filter capacitors in power supplies and disconnect the power when

WAYS turn off power and disconnect test leads before opening the covers to repl

ace the fuse

ry.

the meter unless the back cover and the battery and

fuse covers are in place

y.

making

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EX330-EU-EN V4.5 11/13

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

8.

y the equipment may be impaired.

b

CAUTIONS

otection provided

 Improper use of this meter can cause damage, shock, injury or death. Read and understand

this user manual before op

 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 op

meter.



Use great care when making measurements if the voltages are greater than 25VAC
35VDC. Th



Warning! This is a class A equipment. This equipment can cause interferences in the
quarters; in this case the operat

 Always discharge capacitors and remove power from the device under test before pe

Diode, Resistance or Continuit

 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 ens
the terminals are not "live".

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



by the equipment may be impaired.

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

ell as small parts that the children could swallow. In case a child swallows any of th

w
please contact a ph

Do not leave batteries and packing material lying around unattended; they can be da



for children if the

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

to prevent them f

 Expired or damaged batteries can cause cauterization on contact with the skin. Always

therefor



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

ese voltages are considered a shock ha

y use them as toys

rom training

e, use suitable hand gloves in such case

erating the meter.

or can be required to carry out adequate measures.

y tests.

ysician immediatel

erating the

rms or

zard.

living

rforming

ure that

provided

hazardous objects as

em,

y

ngerous

batteries

,

s

3

EX330-EU-EN V4.5 11/13

Controls and Jacks

1. AC Voltage Detector Sensor
AC Voltage Dete

2.

3. LCD

4. RELATIVE

5. MODE

6.

7.

8.

9.

10.

button
Non-contact AC Voltage Detector test button
Rotary function di
10 ampere te
COM test lead ja
Test lead jack for voltage, milli-amp, micro-amp, resistance,
capacitance, frequency, and temperature

11. RANGE

12. HOLD

13.

button
Protective rubber holster (must be removed to acce
rear bat

tery compartment)

ctor indicator light

push-button

al

st lead jack

ck

functions

button

ss the

1

2

3

4

5

6

13

12
11

7

8

10

Display Symbols and Annunciators

n nano (10-9) (capacitance) µ micro (10-6) (amps, cap)
m milli (10
k kilo (10
M mega (10
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

-3

) (volts, amps) A Amps

3

) (ohms) F Farads (capacitance)

6

) (ohms)  Ohms

Diode test

Battery status

9

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EX330-EU-EN V4.5 11/13

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 EX330 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.

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EX330-EU-EN V4.5 11/13