Extech Instruments Extech 470 Manuale utente

User's Guide

True RMS Multimeter

plus IR Thermometer

Extech 470

Patent Pending

V5.0 5/042

Introduction

Congratulations on your purchase of the Extech 470 (part number

EX470) True RMS Autoranging Multimeter plus IR Thermometer.

This meter measures AC/DC Voltage, AC/DC Current, Resistance,

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

plus Thermocouple and Non-Contact IR Temperature. 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 (in this case)

600 VAC or VDC.

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.

This symbol indicates there is a potential

hazard from a laser light source.

WARNING

CAUTION

MAX

600V

V5.0 5/043

OVERVOLTAGE CATEGORY III

This meter meets the IEC 610-1-95 standard for OVERVOLTAGE

CATEGORY III. Cat III meters are protected against overvoltage

transients in fixed installation at the distribution level. Examples

include switches in the fixed installation and some equipment for

industrial use with permanent connection to the fixed installation.

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 1000VDC/750AC, 200Vrms on

400mV range

mA AC/DC 500mA 250V fast acting fuse

A AC/DC 20A 250V fast acting fuse(30

seconds max every 15 minutes)

Frequency, Resistance,

Capacitance, Duty Cycle,

Diode Test, Continuity

250Vrms for 15sec max

Temperature 60V DC/24V 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 the power and disconnect the test leads

before opening the covers to replace the fuse or batteries.

7. NEVER operate the meter unless the back cover and the

battery and fuse covers are in place and fastened securely.

8. NEVER look directly at the laser light source or aim the

pointer at an eye.

V5.0 5/044

Controls and Jacks

1. IR Thermometer and laser pointer

2. 4000 count LCD display

3. HOLD and Backlight button

4. SELECT button

5. Function switch

6. mA, uA and A input jacks

7. COM input jack

8. Positive input jack

9. RANGE hold button

10. RELATIVE button

11. Laser pointer button

12. Protective holster

Note: Tilt stand and battery compartment are on rear of unit.

Symbols and Annunciators

•))) Continuity

Diode test

Laser pointer

Battery status

Test lead connection

error

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) : 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

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