Overvoltage Category - Extech Instruments AUT500 User Manual

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.
METER SAFETY RULES
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
Voltage DC or V AC
Ohms, Continuity
Diode, Capacitance, Type K Temperature
Frequency, % Duty, Pulse-ms, Dwell
RPM
mA AC/DC
20A AC/DC
* 20A measurements for 30 seconds maximum
Notes: Resistance (Ohms) cannot be measured if voltage is present. Resistance can only be
measured on a non-powered circuit
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.
Input Protection Limits
4
Maximum Input
600V AC or DC
400mA 250V
20A AC or DC*
AUT500-EU-EN v1.0 5/13