B&K Precision XLN60026 - Manual - Manual (Page 38)

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When Local sense is selected, the wire connection can be setup as
follows (shown in the figure above):positive sense (+S) is connected to
the positive lead (+) and negative sense (-S) is connected to the negative
lead (-), whereas the positive lead (+) of the DC output is connected to
the positive end (+) of the device and the negative lead (-) of the DC
output is connected to the negative end (-) of the device under test. When
this sensing mode is selected, the power wires from the DC output leads
to the device under test should be as short as possible.
(19) LAN (optional):
The ETHERNET interface connector
(20) GPIB (optional):
The GPIB interface connector
(21) AC power input:
The power receptacle is for a power source within 100 VAC - 240 VAC.
(22) Earth connection:
Used for earth ground connection.