Teledyne T3DMM6-5, User Manual

Page: 7 / 121

VII
IEC Measurement Category II Overvoltage Protection
To avoid the danger of electric shock, the Digital Multimeter provides overvoltage
protection for line-voltage mains connections that meet both of the following
conditions:
1. The HI and LO input terminals are connected to the mains under
Measurement Category II conditions described in the warning below.
2. The maximum line voltage of the mains does not exceed:
300 VAC for T3DMM4-5
600 VAC for T3DMM5-5 and T3DMM6-5
WARNING:
IEC Measurement Category II includes electrical devices connected to mains at an
outlet on a branch circuit, such as most small appliances, test equipment, and
other devices that plug into a branch outlet or socket.
The multimeter can make measurements with the HI and LO inputs connected to
mains in such devices (≤ 300 VAC for T3DMM4-5 and ≤ 600 VAC for T3DMM5-
5/T3DMM6-5) or to the branch outlet itself.
However, the HI and LO terminals of the multimeter 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 the multimeter.
Limits for Measurements on Other Circuits Not Directly Connected to Mains
Max. rated input voltage: 1000 Vrms
Transient overvoltage: 4000 Vpk
WARNING:
Voltages above 300 VAC (for T3DMM4-5) or 600 VAC (T3DMM5-5 / T3DMM6-5)
can only be measured in circuits that are isolated from mains. However, there may
be transient over voltage in circuits that are isolated from mains. The multimeter is
able to withstand occasional transient overvoltage up to 4000 Vpk. Please don’t
use this instrument to measure circuits where transient overvoltage may exceed
this level.