RIGOL
User’s Guide for DM3068
Input Terminal Protection Limit.
The protection limit applies to input terminals:
1． Main input (HI and LO) terminals.
HI and LO terminals are used for Voltage, Resistance, Capacitance,
Continuity, Frequency and Diodes measurements and should be used under
the following two conditions:
1) HI-LO protection limit: at most 1000 VDC or 750 VAC, this is also the
maximum measurable voltage. The limit can be expressed as 1000 Vpk.
2) LO-ground protection limit: at most 500 Vpk (relative) is allowed to float
at LO terminal with safety.
Since the HI terminal holds a maximum protection of 1000 Vpk relative to the
ground, the sum of the “float” and measured voltages cannot exceed 1000
Vpk.
2． Sampling (HI Sense and LO Sense/200 mA) terminals.
HI Sense and LO Sense/200 mA terminals are used for 4-Wire Resistance
measurement and should be used under the following two conditions:
1) HI Sense-LO Sense/200 mA protection limit: 200 Vpk.
2) LO Sense/200 mA-LO protection limits: 0.5 Vpk. The current input fuse
on the rear panel provides the current passing through LO Sense/200
mA up to 500 mA protection.
3． Current input (10 A and Sense/200 mA) terminals.
10 A and LO terminals are used for current measurements of 2 A and 10 A.
The maximum current which goes through the 10 A terminal is limited to 10
A by the internal fuse. LO Sense/200 mA and LO terminals are used for
current measurements ranging from 200 µA to 200 mA. The maximum
current which go through the LO Sense/200 mA terminal is limited to 500
mA by the internal fuse.
Note:
In order to prevent the fuse from blowing out and protect the
multimeter, please use the current input terminals according to the
following requirements:
1) Do not connect the 10 A and LO Sense/200 mA input terminals into
the current measuring circuit at the same time.
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