Keithley 2790, Справочное руководство

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Model 2790 SourceMeter
®
Switch System Reference Manual 1-7
Pseudocards
Using remote programming, you can assign a pseudocard to an empty switching module
slot. With a pseudocard installed, the Model 2790 will operate as if the switching module
is installed in the Model 2790. This feature allows you to configure your system without
having the actual switching module installed in the unit. There is a pseudocard for the
Keithley Models 7751, 7752, 7753, and 7702 switching modules. 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 7751, 7752, 7753, or 7702 switching module is removed while the Model 2790 is
on, the instrument will operate as if the module is installed. That is, the Model 2790 will
operate as if the pseudocard is installed.
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To avoid erratic operation, 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
Section 2 .
Power supply restrictions with the 7753 module
Under some conditions (low line, maximum current draw), two 7753 modules could draw
enough power to cause the Model 2790 to reset. To avoid this situation, installed modules are
checked at power-up. If a 7753 module is present, the other slot must be empty or populated
with a 7702 module.
If this condition is violated (a Model 7753 plus any other 775x module), the Model 2790
will lock up with the message “1 7753 ONLY” displayed, and all annunciators will turn
on. In this case, you must remove one module and cycle power to continue.