Keithley 7709, User Manual, Page: 25 / 33

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Operation
Detailed information to close and open switching module channels are provided in Section 2 of the Model 27xx User’s
Manual. The following summarizes basic operation, and provides operating information specific to the Model 7709.
Channel assignments
The Model 2700/2701 has two slots for switching modules and the Model 2750 has five slots. To control the appropriate
matrix module, the slot number must be included with the matrix module channel number when you specify a channel. The
channel assignment is formatted as follows:
SCH where: S is the slot number
CH is the channel number
Examples:
101 = Slot 1, Channel 1
210 = Slot 2, Channel 10
506 = Slot 5, Channel 6 (Model 2750)
NOTE For remote operation, the 3-digit channel assignment is included in the channel list parameter for
the commands.
System channel operation
System channel operation is used to connect matrix columns to the Model 27xx DMM. With 2-wire function selected, system
channels 1 through 8 can be closed. When one of these channels is closed, channel 50 automatically closes to connect Row 1
to the DMM.
Figure 2 shows channel 3 closed to connect column 3 to the DMM.
NOTE
With a 2-wire function selected, channels 9 through 48 cannot be closed using system channel
operation.
With a 4-wire function selected, system channels 1 through 4 can be closed. When one of these channels is closed, its paired
channel also closes, and the backplane relays for sense and input (channels 49 and 50) also close.
For a 4-wire function, channels are paired as follows:
CH1 and CH13
CH2 and CH14
CH3 and CH15
CH4 and CH16
Figure 3 shows system channel 3 closed to connect the DUT to DMM Input and Sense.
NOTE
With a 4-wire function selected, channels 5 through 12, and channels 17 through 48 cannot be
closed using system channel operation.