Rigol DM3068

RIGOL
DM3068 Performance Verification Guide
V
IEC II Overvoltage Protection
In order to avoid the danger of electric shock, DM3068 provides overvoltage protection for
line-voltage mains connections meeting both of the following conditions.
1． The HI and LO input terminals are connected to the mains under Measurement Category II
conditions defined below.
2． The mains are limited to a maximum line voltage of 300VAC.
WARNING: IEC II includes electrical devices connected to mains through an outlet from the branch
circuit. Such devices include most small appliances, test equipments and other devices inserted into a
branch socket.
DM3068 may be used to make measurements with the HI and LO inputs connected to mains in such
devices (up to 300VAC), or to the branch socket. However, the HI and LO inputs of DM3068 cannot be
connected to mains of permanently installed electrical devices such as a main circuit-breaker panel,
sub-panel disconnected box or wired motors. Voltages beyond the protection limit of DM3068 may
occur on such devices and circuits.
NOTE: Voltages above 300VAC may be measured only in circuits that are isolated from mains.
However, a transient overvoltage is also present in such circuits. DM3068 was designed to safely
withstand occasional transient overvoltage up to 2500Vpk. Do not use this device to measure circuits
whose transient overvoltage may exceed this level.