Operation Enhancements; Pseudocards; Autozero; Db Calculation - Keithley 2750 User Manual

10-2 Remote Operations

Operation enhancements

There are some operations you can do over the IEEE-488 bus and RS-232 interface that
you cannot do from the front panel. The more important ones are summarized below.

Pseudocards

Using remote operation, you can assign a pseudocard to an empty switching module slot.
With a pseudocard installed, the Model 2750 will operate as if the switching module is
installed in the Model 2750. 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 7700 series switching module.
A single SCPI command (SYSTem:PCARdX, where X=1 to 5) is used to install a
pseudocard in an empty switching module slot. Details are provided in
A pseudocard cannot be installed from the front panel. However, once it is installed, you
can take the Model 2750 out of remote and use the front panel. When the instrument is
turned off, the pseudocard will be lost (uninstalled).

Autozero

Autozero is part of the normal measurement process to assure stable, accurate measure-
ments. Autozero can be disabled to increase measurement speed. However, the readings
will eventually become inaccurate over time and temperature changes.
Autozero can only be disabled using remote programming. It cannot be disabled from the
front panel. Autozero is covered in

dB calculation

Using remote programming, you can select the dB calculation for DC or AC voltage. The
dB calculation makes it possible to compress a large range of measurements into a much
smaller scope. See
You cannot select dB from the front panel. However, once it is selected you can take the
Model 2750 out of remote and use the front panel. When the instrument is reset to default
conditions (or turned off), dB will be lost.
Model 2750 Multimeter/Switch System User's Manual
Section
Section 5 to select and configure the dB calculation.
3.
Section 2.