Keithley 7701 User Manual page 21

With the 4-wire common-side ohms mode selected, channels 33 and 35 are automatically controlled as follows when a system
input channel (1 through 32) is closed.
• Channel 33 is forced open to connect Multiplexer 1 (channels 1 through 16) to Multiplexer 2 (channels 17
through 32).
• Channel 35 is forced closed to connect an input channel (1 through 32) to the DMM Input.
Closing input channel 1 also closes channel 35 to connect DUT1 to the DMM input. All other input channels will open (see
Figure 12). Closing channel 2 also closes channel 35 to connect DUT2 to the DMM. Again, all other channels will open. The
other 30 input channels are controlled in a similar manner. Closing an input channel also closes channel 35 to connect the DUT
to the DMM. All other channels will open.
Selecting 4-wire ohms mode
There are two 4-wire ohms modes: NORM (normal) and CSID (common-side). For this application use the following
procedure to select the CSID mode.
The 4-wire ohms mode can be selected using the following key-press sequence:
1. Press SHIFT and then press CARD.
2. Select CONFIG.
3. Select slot that has the 7701 (i.e., SLOT1: 7701).
4. Select 4W MODE: NORM (normal) or CSID (common-side).
NOTE
Changing the 4-wire ohms mode opens all channels for all modules in the mainframe.
For remote programming, the following commands are valid with a 7701 module installed:
SYSTem:FRESistance:TYPEx, NORMal
SYSTem:FRESistance:TYPEx, CSIDe
SYSTem:FRESistance:TYPEx?
Where the x in TYPEx is the slot number for the 7701 module.
NOTE For the Model 2700, the SYST:FRES:TYPEx command is only supported in units with firmware
revision B03.1 or later. The command is supported for all Model 2701 and 2750 units.
Figure 13
Jumper installation for common-side 4-wire ohms test system
Connects the DUT common-side
Jumper A
bus to DMM Input HI.
Jumper B Connects the DUT common-side
bus to DMM Sense HI.
Jumper C Connects the DUT to DMM Sense LO
through the switching channels.
Jumper D Connects DUT to DMM Input LO
through the switching channels.
Note: These screw teminal jumper connections are
required for the common-side 4-wire ohms test
system shown in Figure 12.
18
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' Select normal 4W mode.
' Select common-side 4W mode.
' Query 4W mode.
Jumper
(1 of 4)
A
C
B
D
DMM HI
MUX 1 HI
MUX 2 HI
DMM SHI
DMM SLO
MUX 2 LO
MUX 1 LO
DMM LO