Safety Instructions - Extech Instruments EX503 User Manual

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
V DC or V AC
mA AC/DC
A AC/DC
Frequency, Resistance, Capacitance,
Diode Test, 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 batteries.
7. NEVER operate the meter unless the back cover and the battery and fuse covers are in place
and fastened securely.
8. If the equipment is used in a manner not specified by the manufacturer, the protection provided
by the equipment may be impaired.
Input Protection Limits
1000VDC/AC rms
400mA AC/DC
10A AC/DC (20A for 30 sec)
600VDC/AC rms
4
Maximum Input
EX503-en-GB_ v5.4 12/15