Overvoltage Category; Safety Instructions - Extech Instruments DM4750D Manual

OVERVOLTAGE CATEGORY III
This meter meets the IEC 61010-1-2001 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:
Function
VAC
V DC or V AC
mA DC
A DC
Ohms, Continuity
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 cover is in place
and fastened securely.
Input Protection Limits
750V DC/AC
1000V DC/AC, 200Vrms on 200mV range
200mA 250V fast acting fuse
20A 250V fast acting fuse(30 seconds max every 15 minutes)
250Vrms for 15sec max
Maximum Input