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IEC Measurement Category II Overvoltage Protectio
n
RSDM3055 Digital Multimeter provides overvoltage protection
for line-voltage mains connections meeting both of the
following conditions to avoid the danger of electric shock ：
1. The HI and LO input terminals are connected to the
mains under Measurement Category II conditions as
following.
2. The maximum line voltage of the mains is 600VAC.
WARNING:
IEC Measurement Category II includes electrical devices
connected to mains at an outlet on a branch circuit, such as
most small appliances, test equipments, and other devices
that plug into a branch outlet or socket.
RSDM3055 is capable of making measurements with the HI
and LO inputs connected to mains in such devices (up to
600VAC) or the branch outlet itself. However, the HI and LO
terminals of RSDM3055 can't be connected to mains in
permanently installed electrical devices such as the main
circuit-breaker panels, sub-panel disconnected boxes and
permanently wired motors. Such devices and circuits are
prone to exceed the protection limits of RSDM3055.
NOTE:
Voltages above 600VAC only can be measured in circuits that
are isolated from mains. However, there may be transient
overvoltage in circuits that are isolated from mains. RSDM3055
is able to withstand occasional transient overvoltage up to
4000Vpk. Please don't use this instrument to measure circuits
that transient overvoltage may exceed this level.
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