Capture pre-trigger data, if desired
The measurement system lets you capture data before, after, or at the trigger signal. As shown in the
following figure, you can move the block of data being read into the acquisition buffer with reference to
the trigger. This allows pre- or post-trigger data sampling.
To offset the beginning of the acquisition buffer relative to the acquisition trigger:
Front Panel Menu Reference SCPI Command
Select Measure\Sweep.
Enter an Offset value. Then press Select.
To offset the measurement by 100 points:
SENS:SWE:OFFS:POIN 100
When the value is 0, all measurement samples are taken after the trigger. Positive values represent
the delay after the trigger occurs but before the samples are acquired. This can be used to exclude
measurement samples that occur during the delay time. (Delay time = offset x sample period).
Negative values represent data samples taken prior to the trigger. This lets you acquire measurement
samples prior to the trigger.
Select the trigger source
A TRIGger:ACQuire[:IMMediate] command over the bus will always generate an
immediate measurement trigger, regardless of the selected trigger source.
Unless you are using TRIGger:ACQuire[:IMMediate], select a trigger source from the following:
4 Using the Regenerative Power System
150 Keysight RP7900 Series Operating and Service Guide
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