Rigol DM3068, Service Manual

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Chapter 2 Performance Test RIGOL
Service Guide for DM3068
2-7
2. 4 Input Connections
To perform a zero-offset test, you must use a 4-teriinal short-circuiter which is made
of copper or copper alloy with low thermoemf. A coaxial cable whose shielding layer
is connected to the LO terminal should be used for the capacitance test, while a
Teflon Shielded Twisted Pair with isolation and as short as possible is available for
other kinds of tests. But please note the terminals HI, LO, HI-Sense and LO-Sense
must be used through a coaxial cable and the shielding layer must be grounded so as
to reduce the influence from low thermoemf and exterior interference.
Figure 2-1 Input terminals
HI-Sense
LO-Sense
/200mA
HI
LO
10A