72 Chapter 3
Mode
Meas Off (Spectrum Analyzer) Measurement
Mode
Free Run (Immediate) When free run is selected, triggering occurs immediately after the
sweep/measurement is initiated.
Video Sets the video signal as the trigger source. With Video selected, the trigger
condition is met when the video signal crosses the filtered and detected version of the input
signal, including RBW filtering.
The video trigger level is shown as a labeled line on the display. The line is displayed as
long as video is the selected trigger source.
Remote Command Notes IMMediate – free run triggering
EXTernal – triggers on an externally connected trigger source on
the rear panel
RFBurst – triggers on the bursted frame
VIDeo – triggers on the video signal level
Other trigger-related commands are found in the INITiate and
ABORt subsystems.
*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.
Preset Free Run (Immediate)
State Saved Saved in State
Key Path
Meas Setup
Remote Command *TRG
Example TRIG:SOUR IMM
*TRG
Remote Command Notes The *TRG command immediately initiates a trigger.
Key Path
Meas Setup, Trigger, Free Run (Immediate)
Example TRIG:SOUR VID selects video triggering.
Dependencies / Couplings Triggers and detector modes are independent.
Trigger slope cannot be set for Video triggering.
Remote Command Notes See Trigger
Key Path
Meas Setup, Trigger, Video
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