RIGOL DM3058 - Manual (Page 29)

RIGOL
Quick Guide for DM3058/DM3058E III
E
N
G
L
IS
H
2) LO-ground protection limitation. LO terminal can safely
“float” 500Vpk relative to the ground.
The maximum protection limitation of HI terminal relative to
the ground is 1000Vpk. Therefore, the sum of the “float”
voltage and the measured voltage cannot exceed 1000Vpk.
2． Sampling (HI Sense and LO Sense) terminal
HI Sense and LO Sense are used for 4-Wire Resistance
Measurement. Two protection limitations are defined:
1) HI Sense-LO Sense protection limitation: 200Vpk.
2) LO Sense-LO protection limitation: 2Vpk.
3． Current input (I) terminal
I and LO terminal are used for current measurement. The
maximum current which go through the I terminal is limited to
10A by the fuse on the rear panel.
NOTE: Voltage on the current input terminal corresponds to voltage
on LO terminal. To obtain favorable protection, specified fuse
should be used.
IEC Measurement Category II Overvoltage Protection
To protect against the danger of electric shock, DM3058/DM3058E
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 600VAC.
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 600VAC),
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 600VAC 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.