1-8 Getting Started Model 2701 User’s Manual
Plug-in switching modules
Up to two Keithley Model 77xx series switching modules can be installed in the
Model 2701. A side-by-side comparison of the switching modules is provided in
Table 1-1.
Basic close/open operation for switching module channels is provided in Section 2, while
scanning is covered in Section 7. Connection information for the Model 7700 switching
module is provided in Appendix B. For all other switching modules, connection informa-
tion is provided in their respective packing lists.
NOTE For maximum system performance, it is recommended that all measurement
cables be limited to less than 3 meters.
Pseudocards
Using remote programming, you can assign a pseudocard to an empty switching module
slot. With a pseudocard installed, the Model 2701 will operate as if the switching module
is installed in the Model 2701. This feature allows you to configure your system without
having the actual switching module installed in the unit. There is a pseudocard for every
Keithley Model 77xx series switching module. For details, see “Pseudocards,” page 2-6.
Identifying installed switching modules
On power-up, the model numbers of installed switching modules are displayed briefly. If a
Model 7700, 7701, 7702, 7703, 7705, 7708, 7709, 7710, 7711, or 7712 switching module
is removed while the Model 2701 is on, the instrument will operate as if the module is
installed. That is, the Model 2701 will operate as if the pseudocard is installed.
NOTE If a Model 7706 or 7707 is removed while power is on, error +523 “Card hard-
ware error” will occur, and the module will be removed from the system.
In general, it is not recommended to install or remove switching modules with
the power on.
The CARD menu and remote query commands can be used to identify modules installed
in the mainframe. For details, see “Switching module installation and connections,”
page 2-4.
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