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Model 2790 SourceMeter
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
Math programming examples
Example #1 — The following command sequence performs the mX+b calculation for
channels 101 and 102 of the Model 7702. Keep in mind that after CALC:DATA? is sent,
the Model 2790 has to be addressed to talk to send the math result to the computer.
CALC:FORM MXB
CALC:KMAT:MMF 2
CALC:KMAT:MBF 100
CALC:STAT ON
ROUT:CLOS (@101)
CALC:DATA?
ROUT:CLOS (@102)
CALC:DATA?
Example #2 — The following command sequence configures channels 101 through 110
of the Model 7702 to perform the percent calculation when they are scanned.
CALC:FORM PERC,(@101:110)
CALC:KMAT:PERC 100,(@101:110)
CALC:STAT ON,(@101:*110)
®
Switch System Reference Manual
Table
' Select mX+b calculation.
' Set 'm' factor to 2.
' Set 'b' factor to 100.
' Enable math calculation.
' Close channel 101.
' Read mX+b result for channel 101.
' Close channel 102.
' Read mX+b result for channel 102.
' Select percent calculation.
' Set reference to 100.
' Enable math calculation.
5-17
5-2.
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