RIGOL DM3058 - Manual (Page 6)

RIGOL
User’s Guide for DM3058/DM3058E IV
WARNING: IEC Measurement Category II includes electrical devices connected to
mains at an outlet on a branch circuit. Such devices include most small appliances,
test equipment, and other devices that plug into a branch outlet or socket.
DM3058/DM3058E may be used to make measurements with the HI and LO inputs
connected to mains in such devices (up to 600 VAC), or to the branch outlet itself.
However, DM3058/DM3058E may not be used with its HI and LO inputs connected
to mains in permanently installed electrical devices such as the main circuit-breaker
panel, sub-panel disconnected boxes, or permanently wired motors. Such devices
and circuits are subject to overvoltage that may exceed the protection limits of
DM3058/DM3058E.
NOTE: Voltages above 600 VAC may be measured only in circuits that are isolated
from mains. However, transient overvoltage is also present on circuits that are
isolated from mains. DM3058/DM3058E is designed to safely withstand occasional
transient overvoltage up to 4000Vpk. Do not use this equipment to measure circuits
where transient overvoltage could exceed this level.