Extech Extech EX430-NIST Manual

User's Guide

True RMS Multimeter

Extech 430

99 Washington Street
Melrose, MA 02176

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

Visit us at www.TestEquipmentDepot.com

Introduction

Congratulations on your purchase of the Extech 430 (part number EX430) True RMS Autoranging
Multimeter. This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance,
Frequency, Duty Cycle, Diode Test, and Continuity plus Thermocouple Temperature. Proper use and
care of this meter will provide many years of reliable service.

Safety

International Safety Symbols

This symbol, adjacent to another symbol or terminal, indicates the user must refer to the
manual for further information.

This symbol, adjacent to a terminal, indicates that, under normal use, hazardous voltages
may be present

Double insulation

WARNING

CAUTION

MAX
600V

This WA
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.

RNING symbol indicates a potentially hazardous situation, which if not

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CAUTIONS

 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. Rep



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



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

y the equipment may be impaired.

b

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

well as small parts that the children could swallow. In case a child swallows any of them,
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 from training



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



air or replace any damage befor

ese voltages are considered a shock ha

y use them as toys

e, use suitable hand gloves in such case

erating

the meter.

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into the fire.

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OVERVOLTAGE CATEGORY III

This meter meets the IEC 610-1-2001 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:

V DC or V AC 1000V DC/750V AC, 200Vrms on 400mV range

Function Maximum Input

mA AC/DC 500mA 250V fast acting fuse
A AC/DC 20A 250V fast acting fuse(30 seconds max every 15

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

7. NEVER operate the meter unless the back cover and the battery and fuse covers are in place
and fastened securely.

Input Protection Limits

minutes)
250Vrms for 15sec max

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Controls and Jacks

1. 4000 count LCD display

2. HOLD

3. SELECT button
itch

4. Function

sw

5. mA, uA and A input jacks

6. COM input jack

7. Positive

8.

RANGE hold butt

9. RELATIVE

input

butto

jack

on

n

10. Backlight button

11. Protective holster

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

Note

Symbols and Annunciators

•))) Continuity
Diode test

Battery status

Test lead connection
error

n nano (10
µ micro (10
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

-9

) (capacitance)

-6

) (amps, cap)

-3

) (volts, amps) A Amps

3

) (ohms) F Farads (capacitance)

6

) (ohms)  Ohms

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