172 Sequoia Series
6.6.5 Simultaneous Output Phase Measurements
You can return simultaneous measurements from all output phases of the source in the three phase
mode using the FETCh query. Unlike MEASure queries, FETCh queries do not trigger the acquisition
of new data when they are executed. First, you must initiate the measurement trigger system and
generate a measurement trigger as explained in the following section "Triggering Measurements".
When the measurement data has been acquired by the voltage and current data buffers for each
output phase, use INSTrument:NSELect to select each phase, and FETCh to return the specified
measurement data. The following commands return rms voltage:
INSTrument:NSELect 1
FETCh:VOLTage:AC?;*WAI
INSTrument:NSELect 2
FETCh:VOLTage:AC?;*WAI
INSTrument:NSELect 3
FETCh:VOLTage:AC?;*WAI
6.6.6 Returning Voltage and Current Data From the Data Buffer
The MEASure and FETCh queries can also return all 4096 data values of the instantaneous voltage
and current buffers. These are:
MEASure:ARRay:CURRent[:DC]?;*WAI
MEASure:ARRay:VOLTage[:DC]?;*WAI
6.6.7 Triggering Measurements
You can use the data acquisition trigger system to synchronize the timing of the voltage and current
data acquisition with an external trigger source. Then use the FETCh commands to return different
calculations from the data acquired by the measurement trigger.
The following measurement trigger sources can be selected:
IMMediate Aquire the measurements immediate
SYNChronize Internal to phase A angle
BUS IEEE-488 device, *TRG, or <GET> (Group Execute Trigger)
TTLTrg The signal driving the Trigger Out
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