Overvoltage Category; Safety Instructions - Extech Instruments EX410A User Manual

OVERVOLTAGE CATEGORY III

SAFETY INSTRUCTIONS

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This meter meets the IEC 61010-1 (2010) 3
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.
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.
NEVER apply voltage or current to the meter that exceeds the specified maximum:
Function
V DC or V AC 600V DC/AC, 200Vrms on 200mV range
mA DC 200mA 600V fast acting fuse
A DC 10A 600V fast acting fuse (30 seconds max every 15 minutes)
Ohms, Continuity 250Vrms for 15sec max
USE EXTREME CAUTION when working with high voltages.
DO NOT measure voltage if the voltage on the "COM" input jack exceeds 600V above earth
ground.
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.
ALWAYS discharge filter capacitors in power supplies and disconnect the power when making
resistance or diode tests.
ALWAYS turn off the power and disconnect the test leads before opening the covers to replace
the fuse or battery.
NEVER operate the meter unless the back cover and the battery cover is in place and fastened
securely.
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rd edition standard for OVERVOLTAGE CATEGORY III.
Input Protection Limits
Maximum Input
4 EX410A-en-GB_V6.0 6/16
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