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Trigger
I/Q Trigger Source
This command selects the trigger to be used for the specified measurement when I/Q (which requires
option BBA) is the selected input. The I/Q trigger source can be queried and changed even while another
input is selected, but it is inactive until I/Q becomes the selected input.
Notes: Not all measurements have all the trigger sources available to them. Check the
trigger source documentation for your specific measurement to see what
sources are available.
Not all trigger sources are available for each input. For the
RF Trigger
Source,
the following trigger sources are available:
— IMMediate - free run triggering
— VIDeo - triggers on the video signal level
— LINE - triggers on the power line signal
— EXTernal1 (or EXTernal) - triggers on an externally connected trigger
source marked “Trigger 1 In” on the rear panel
— EXTernal2 - triggers on an externally connected trigger source marked
“Trigger 2 In” on the front panel. In some models, there is no second
External input. In these models, the External 2 key is blanked and the
EXTernal2 parameter will generate a “Hardware missing; Not available
for this model number” message
— RFBurst - triggers on the bursted frame
— FRAMe - triggers on the periodic timer
— IF (video) - same as video, for backwards compatibility only
*OPC should be used after requesting data. This will hold off any subsequent
changes to the selected trigger source, until after the sweep is completed and
the data is returned.
Available ranges, and presets can vary from mode to mode.
Status Bits/OPC dependencies: The Status Operation Register bit 5 "Waiting for Trigger" is set at the same
time as the Sweeping or Measuring bit is set. It is cleared when the trigger
actually occurs (that is, after the trigger event occurs and all the applicable
trigger criteria have been met). A corresponding pop-up message ("Waiting
for trigger") is generated if no trigger signal appears after approximately 2 sec.
This message goes away when a trigger signal appears.
Initial S/W Revision: Prior to A.02.00
Remote Command: :TRIGger:<measurement>[:SEQuence]:IQ:SOURce
EXTernal1|EXTernal2|IMMediate|IQMag|IDEMod|QDEMod|IINPu
t|QINPut|AIQMag
:TRIGger:<measurement>[:SEQuence]:IQ:SOURce?
Example: TRIG:WAVeform:SOUR IQM
Selects I/Q magnitude triggering for the IQ Waveform measurement and the
I/Q input