Extech Instruments EX330 User manual

User's Guide

Mini Multimeter

with Non-Contact Voltage Detector (NCV)

Model EX330

Model EX330 - Version 4.0 – 05/06

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.

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.

WARNING

CAUTION

MAX

600V

Model EX330 - Version 4.0 – 05/06

Controls and Jacks

1. AC Voltage Detector Sensor

2. AC Voltage Detector indicator light

3. LCD display

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

•))) Continuity

Diode test

Battery status

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

Model EX330 - Version 4.0 – 05/06

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.

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 EX330 - Version 4.0 – 05/06

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 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.

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.

Model EX330 - Version 4.0 – 05/06

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.

Model EX330 - Version 4.0 – 05/06

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”.

Model EX330 - Version 4.0 – 05/06

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. Use the MODE button to view the icon on

the display.

4. Touch the test probes to the diode under test.

Forward voltage will typically indicate 0.400 to

0.700V. Reverse voltage will indicate “OL”.

Shorted devices will indicate near 0V and an

open device will indicate “OL” in both polarities.

Model EX330 - Version 4.0 – 05/06

CAPACITANCE MEASUREMENTS

WARNING: To avoid electric shock, disconnect power

to the unit under test and discharge all capacitors

before taking any capacitance measurements.

Remove the batteries and unplug the line cords.

1. Set the rotary function switch to the CAP

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 CAP jack.

4. Touch the test leads to the capacitor to be

tested.

5. The test may take up to 3 minutes or more for

large capacitors to charge. Wait until the

readings settle before ending the test.

6. Read the capacitance value in the display

FREQUENCY MEASUREMENTS

1. Use the MODE button to view the Hz unit of

measure on the LCD display.

2. Insert the black test lead banana plug into the

negative COM jack and the red test lead

banana plug into the positive Hz jack.

3. Touch the test probe tips to the circuit under

test.

4. Read the frequency on the display.

% DUTY CYCLE

1. Set the rotary function switch to the Hz/%

position.

2. Use the MODE button to view the %unit of

measure on the LCD display.

3. Insert the black lead banana plug into the

negative COM jack and the red test lead banana

plug into the positive Hz jack.

4. Touch the test probe tips to the circuit under test.

5. Read the % duty cycle on the display.

CONTACT TEMPERATURE MEASUREMENTS

1. Set the function switch to the ºF or ºC position.

2. Insert the Temperature Probe into the input jacks, making

sure to observe polarity.

3. The probe can be pressed against a device under test to

read its temperature or the probe can be held in air to read

the ambient temperature. Allow 30 seconds for the display

to stabilize.

4. Read the temperature in the display.

Model EX330 - Version 4.0 – 05/06

AUTO-MANUAL RANGE SELECTION

When the meter is first turned on, it automatically goes into the Auto Range mode. This

automatically selects the best range for the measurements being made and is generally

the best mode for most measurements. For measurement situations requiring that a range

be manually selected, perform the following:

1. Press the RANGE key. The AUTO display indicator will turn off.

2. Press RANGE to step through the available ranges until the desired range is

selected.

3. To exit the Manual Ranging mode and return to Auto Range, press and hold the

RANGE key for 2 seconds.

Note: Manual range does not apply to Capacitance, Frequency or Temperature modes.

RELATIVE MODE

The relative measurement feature allows you to make measurements relative to a stored

reference value. A reference voltage, current, etc. can be stored so that subsequent

measurements can be made in comparison to that value. The displayed value is the

difference between the reference value and the measured value.

1. Perform the measurement as described in the operating instructions.

2. Press the REL button to store the reading (the REL indicator will appear on the

display).

3. The display will now indicate the difference between stored value and subsequent

measurements.

4. Press the REL button to exit the relative mode.

Note: The Relative mode is not available when measuring Frequency or Duty Cycle.

Maintenance

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

before removing the back cover or the battery or fuse covers.

WARNING: To avoid electric shock, do not operate your meter until the battery and fuse

covers are in place and fastened securely.

This MultiMeter is designed to provide years of dependable service, if the following care

instructions are performed:

1. KEEP THE METER DRY. If it gets wet, dry it immediately.

2. USE AND STORE THE METER IN NORMAL TEMPERATURES. Temperature

extremes can shorten the life of the electronic parts and distort or melt plastic

parts.

3. HANDLE THE METER GENTLY AND CAREFULLY. Dropping it can damage the

electronic parts or the case.

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

NOT use chemicals, cleaning solvents, or detergents.

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

Remove old or weak batteries so they do not leak and damage the unit.

6. IF THE METER IS TO BE STORED FOR A LONG PERIOD OF TIME, the

batteries should be removed to prevent damage to the unit.

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