Extech EX330 Instruction Manual

User's Guide

Mini Multimeter

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.

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.

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

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.

every 15 minutes

250V DC/AC

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 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

) (ohms) F Farads (capacitance)

) (ohms) Ω Ohms

Diode test

Battery status

12 11

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

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