Front Panel Operation; Remote Programming - Keithley 2790 User Manual

Model 2790 SourceMeter

Front panel operation

An ohms math function is enabled from the MATH menu, which is accessed by pressing
and releasing SHIFT and then MATH (see
only available in the menu if the associated 7751, 7752, or 7753 module is installed.
Figure 2-3
Enabling ohms math function
Select math
function

Remote programming

As shown in
function. Notice that the math setting can be global to all qualified channels or set on a
per-channel basis by using the <clist> parameter.
NOTE
Source tracking
The Model 2790 provides source tracking to ensure that the most recently set source
amplitude is used in the selected ohms calculation. If the source output level changes, the
"m" constant for the calculation will change accordingly.
Source tracking is enabled automatically when the desired ohms function is selected. No
other actions are required by the user.
However, if desired, source tracking can be disabled or the source that is being tracked can
be changed. The :TRACk and :SOURCe commands are listed in
®
Switch System User's Manual
Press
SHIFT
Press
MATH
S1IOHMS
7751/7752/7753
in slot 1
* 7753 should be installed in slot 1 for rated accuracy.
Table 2-2, the :CALC:FORMat command is used to select an ohms math
With an ohms math function selected, the Model 2790 is actually measuring
DCV. Therefore, if you send SENS1:FUNC? to query the selected function, it
will return "VOLT:DC".
Figure 2-3). Note that an ohms math function is
S1VOHMS S2IOHMS
7751/7752/7753*
7751/7753
in slot 2
in slot 1
S2VOHMS
7751/7753*
in slot 2
Table 2-2.
2-11