Extech Instruments MM750W User Manual page 5

We designed this device for safe use but please operate with caution. Follow the safety rules,
below, for safe operation.
1. NEVER apply voltage or current to the meter that exceeds the specified maximum:
Function
V DC or V AC
uA AC/DC
mA AC/DC
A AC/DC
Frequency/Duty Cycle, Resistance,
Diode Test, Capacitance, 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 position; 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. Do not use the device immediately after moving it from a cold to a warm environment;
condensation may form and damage the meter. Leave the device switched off until it has
reached room temperature before use.
9. Do not use the meter immediately before, during, or after an electrical storm (thunder,
lightning, etc.).
10. 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
Maximum Input
1000VDC / AC rms
600mA 1000V fast acting fuse
600mA 1000V fast acting fuse
10A 1000V fast acting fuse (15 seconds max.;
always turn the meter OFF for 15 minutes between
10A measurement cycles)
1000V DC / AC rms
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