Remote Command Programming - Keithley SourceMeter 2400 Series Quick Results Manual

NOTE Manual offset-compensated ohms is also available as a math function (FCTN). This
math function allows you to specify both source levels (see "Math functions" in
"Features to enhance DUT testing."
In-circuit ohms measurements
Ohms guard allows you make accurate in-circuit ohms measurements on resistor networks.
These measurements are covered in Advanced operation.

Remote command programming

Data string
The :READ? command is typically used to trigger a source-measure action and request the
data string. The data string is sent to the computer when the SourceMeter is addressed to talk.
The data string is typically made up of five elements separated by commas. The first element
is the voltage reading, the second is the current reading, and the third is the resistance reading.
For voltage and current, the reading could be source or measure depending on how the instru-
ment is configured. For example, if sourcing voltage and measuring current, the voltage ele-
ment is the source reading and the current element is the measured reading. The NAN (not a
number) value of +9.91e37 is used for a function that is not enabled.
The fourth data element is the timestamp and the fifth is the status word. See Section 18,
FORMat subsystem, of the 2400 Series SourceMeter User's Manual for details on all aspects of
the data format.
NOTE
The five element data string is the GPIB default condition.
Quick Results Guide 15