Keithley 7011-S Instruction Manual page 54

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A. Test Configuration
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L---J L----l L---l
199 DMM
7011
Dlrr
8. Simplified Equivalent Circuit
Figure 4-4
Z-wire resistance testing
Four-wire resistc tests
More precise measurements over a wider range of sys-
tem and DIJT conditions can be obtained by using the
four-wire measurement scheme shown in Figure 45.
Here, separate sense leads from the Model 196 DMM
are routed through the multiplexer to the resistor un-
der test. The extra set of sense leads minimizes the ef-
fects of voltage drops amoss the test leads. Note,
however, that an extra two poles of switching are re-
quired for each
resiStor tested.
For this reason, only 20
resistors per card can be tested using this configura-
tiOIL
The Model 7011 can be configured for 20 channels of 4
pole operation by isolating Banks A and B from Banks
C and D, and by programming the Model 7001 main-
frame for 4pole mode. The resulting pa&d channels
are shown in Table 4-1.
Table 4-1
Paired
Channels in &pole Operation
7001
Channel
CHANNEL p&ill CONlWtiOXl
assignment 4-p& designations
1 land21 BankA,Inl and
BankC,Inl
2
2and22 BmkA,LnZand
BankC,In2
3
3and23 Bank A, In 3 and
BankC,In3
4
4and24 BmkA,In4and
BankC,In4
5
5and25 BankA,In5and
BankC,In5
6
6and26 BmkA,In6and
BankC,Ino
7
7and27 BankA,ln7and
BankC,In7
8
8and28 BankA,InSand
BankC,In8
9 9and29 BankA,ln- znd
BankC,In
10 10 and 30 BankA,InlOand
BankC,lnlO
11 11 and 31 BankB,Inl and
BankD,Inl
12 12 and 32 BankB,InZand
Ban!cD,InZ
13 13and33 BankB,In3and
BankD,In3
14
14and34 BankB,In4and
BmlcD,In4
15
15
and 35 BankB,In5and
BankD,Ln5
16 ~'. 5 and 36 BankB,ln6and
BankD,In6
17
17and37 BankB,In7and
BankD,In'/
18
18 and 35 BankB,InSand
BankD,In8
19
19 and 39 BankB,Ingand
BankD,In9
20
2Oand40 BankB,InlOand
BankD,InlO
4-6