User manual

SIGLENT
IV SDM3055 Digital Multimeter
3. Current input (I) terminal
I and LO terminals are used for current measurement. The maximum
current which go through the I terminal is limited to 10A by the fuse on the
back panel.
NOTE:
Voltage on the current input terminal corresponds to voltage on LO terminal.
To keep good protection, only use the fuse of specified type and level to
replace this fuse.
IEC Measurement Category II Over-voltage Protection
SDM3055 Digital Multimeter provides over-voltage protection for line-voltage
mains connections meeting both of the following conditions to avoid the
danger of electric shock：
 The HI and LO input terminals are connected to the mains under
Measurement Category II conditions as following.
 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.
SDM3055 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 SDM3055 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 SDM3055.
NOTE:
Voltages above 600VAC only can be measured in circuits that are isolated
from mains. However, there may be transient over-voltage in circuits that are
isolated from mains. SDM3055 is able to withstand occasional transient
over-voltage up to 4000Vpk. Please don’t use this instrument to measure
circuits that transient over-voltage may exceed this level.