16-4 SCPI Signal-Oriented Measurement Commands Models 2500 and 2502 User’s Manual
DATA[:LATest]?
Description This command works exactly like FETCh?, except that it returns only
the most recent reading from the channel selected by :FORM:ELEM.
READ?
Description This command is used to trigger and acquire readings. The number of
readings depends on how the trigger model is configured. For example,
if configured for 20 source and measure operations (arm count 1, trigger
count 20), then 20 sets of readings will be acquired after the Model 2500
returns to the idle state.
When this command is sent, the following commands execute in the
order that they are presented:
• :INITiate
• :FETCh?
The :INITiate command starts operation by taking the instrument out of
idle.
NOTE :READ? is illegal when the :ARM:SOUR BUS command is in effect. See
Section 10, “Triggering,” for details.
After all source and measure operations are completed, the Model 2500
goes back into idle at which time the :FETCh? command is executed.
The readings are sent to the computer and displayed when the Model
2500 is addressed to talk.
NOTE The :FORM:ELEM command controls the reading source. To access channel 1
readings, send :FORM:ELEM CURR1 before sending :READ?. To access chan-
nel 2 readings, send :FORM:ELEM CURR2 before using :READ?. See
Section 17, “FORMat subsystem,” for details.
READ? will work with the output off. If in the sweep mode with a trig-
ger count >1, the source value on the display will update; however, the
actual output will be 0V.
If auto output-off is enabled (:SOURce1:CLEar:AUTO ON or
:SOURce2:CLEar:AUTO ON), then the corresponding output will auto-
matically turn on at the beginning of each SDM (source-delay-measure)
cycle and turn off after each measurement.
NOTE See Appendix C for a detailed explanation on how data flows through the vari-
ous operation blocks of the Model 2500. It clarifies the type of readings that are
acquired by the various commands to read data.
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