Keithley 7011-S Instruction Manual page 55

Bank jumper removal is described in paragraph 3.3.1.
To configure the connector card for 4-p& operation,
only mncwe the jumpers between Banks C and D
i.WlO2
and W103).
Selecting 4-p& operation for a Model 7001 card slot is
discussed in Section 4 of the Model 7001 Instruction
Manual. After the Ppole mode is selected, the Model
7001
mainframe will display just 20 channels for the
chosen card slot. Each closed channel will also dose its
paired channel on the card.
Although the four-wire connection scheme minimizes
problems caused by voltage drops, there is one other
potentially txublesome area associated with low r&s-
tance measurements: thermal EM% caused by the re-
lay contacts. In order to compensate for thermal EMFs,
the offset-compensated ohms feature of the Model 196
DMM should be used. To we this feature, short the HI
and LO terminals of one of the bank inputs, then close
the relay. Enable zero on the Model 196, then select off-
set-compensated ohms.
removed
A. Test Configmtian
r---i
r---1
L---J L---J
L---J
196 DMM
7011
DLn
B. aimpmed Eq"ivalent circuit
Figure 4ii
Four-wire resistance testing
4-7