Specifications

RIGOL
Quick Guide for DM3000 series
III
ENGLISH
the maximum measurable voltage. The limitation can be
expressed as 1000 Vpk.
2) LO-ground protection limitation. LO terminal can safely
“float” 500 Vpk relative to the ground.
The maximum protection limitation of HI terminal relative to
the ground is 1000 Vpk. Therefore, the sum of the “float”
voltage and the measured voltage cannot exceed 1000 Vpk.
2． Sampling (HI Sense and LO Sense) terminal
HI Sense and LO Sense are used for 4-Wire Resistance and
Ratio 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
DM3000 can measure under IEC Measurement Category II.
To protect against the danger of electric shock, DM3000 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 300 VAC.
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.
DM3000 may be used to make measurements with the HI and LO
inputs connected to mains in such devices, or to the branch outlet
itself (up to 300 VAC). However, DM3000 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 the DM3000 series Digital Multimeter.
NOTE：Voltages above 300 VAC may be measured only in circuits
that are isolated from mains. However, transient overvoltage is also
present on circuits that are isolated from mains. DM3000 is
designed to safely withstand occasional transient overvoltage up to
2500 Vpk. Do not use this equipment to measure circuits where
transient overvoltage could exceed this level.