Extech Instruments 430 User Manual

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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 1000V DC/750V AC, 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 battery.
7. NEVER operate the meter unless the back cover and the
battery and fuse covers are in place and fastened securely.

Extech Instruments 430 Specifications

General

Category	Multimeter
Diode Test	Yes
Continuity	Yes
Battery Type	9V
Safety Rating	CAT III 600V
Display	LCD
DC Voltage	400mV, 4V, 40V, 400V
AC Voltage	4V, 40V, 400V
DC Current	400µA, 4000µA, 40mA, 400mA, 10A
AC Current	400µA, 4000µA, 40mA, 400mA, 10A
Resistance	400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ, 40MΩ
Capacitance Range	40nF, 400nF, 4µF, 40µF, 100µF
Frequency Range	10Hz, 100Hz, 1kHz, 10kHz, 100kHz
Model	Extech Instruments 430

Summary

Introduction and Safety

Safety Symbols Explained

Explains hazard, warning, caution symbols and protective insulation indicators.

Safety Instructions

Overvoltage Category III Compliance

Input Protection and Safety Rules

Details input protection limits and lists critical safety rules for operation.

Specifications - Voltage and Current

DC Voltage Specifications

AC Voltage Specifications

DC Current Specifications

AC Current Specifications

Specifications - Other Measurements

Resistance Specifications

Operating Instructions - Basic Measurements

General Operation and Safety

Provides general rules for operating the multimeter safely and effectively.

DC Voltage Measurement Guide

Step-by-step guide for measuring DC voltage using the multimeter.

AC Voltage Measurement Guide

AC Voltage Measurement Procedure

Step-by-step guide for measuring AC voltage using the multimeter.

DC Current Measurement

DC Current Measurement Procedure

Detailed instructions for measuring DC current, including range selection.

AC Current Measurement

AC Current Measurement Procedure

Detailed instructions for measuring AC current, including range selection.

Resistance Measurement

Resistance Measurement Procedure

Step-by-step guide for measuring resistance, including safety precautions.

Continuity Check and Diode Test

Continuity Check Procedure

Instructions for performing a continuity test and interpreting results.

Diode Test Procedure

Capacitance, Frequency, Duty Cycle

Capacitance Measurement

Frequency Measurement

Contact Temperature Measurement

Temperature Measurement Procedure

Advanced Meter Features

Battery Installation

Battery Installation Procedure

Step-by-step guide for safely installing or replacing the battery.

Fuse Replacement

Fuse Replacement Procedure

Detailed steps for safely replacing fuses, including fuse types and sizes.