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336 Chapter 5
Language Reference
TRIGger Subsystem
Trigger Source
:TRIGger[:SEQuence]:SOURce IMMediate|VIDeo|LINE|EXTernal
:TRIGger[:SEQuence]:SOURce?
Specifies the source (or type) of triggering used to start a measurement.
Immediate is free-run triggering
Video triggers on the video signal level
Line triggers on the power line signal
External allows you to connect an external trigger source
Factory Preset
and *RST: Immediate (free-run triggering)
Remarks: Free-run activates the trigger condition that allows the next
sweep to start as soon as possible after the last sweep.
Front Panel
Access:
Trig, Free Run
Trig, Video
Trig, Line
Trig, External Pos Neg
NOTE Trigger Delay is not available in Free Run, so turning Free Run on turns off
Trigger Delay, but preserves the value of Trigger Delay.
Video Trigger Level Amplitude
:TRIGger[:SEQuence]:VIDeo:LEVel <ampl>
:TRIGger[:SEQuence]:VIDeo:LEVel?
Specifies the level at which a video trigger will occur.
Factory Preset
and *RST:. 2.5 divisions below reference level
Range:. 10 display divisions below reference level to reference level
Default Unit:. current amplitude units
Remarks:. Video is adjusted using this command, but must also be selected
using the command :TRIGger[:SEQuence]:SOURce
VIDeo. When in FM Demod and Demod View is on, the Video
Trigger level is adjusted/queried using the command
:TRIGger[:SEQuence]:VIDeo:LEVel:FREQuency
<freq>.
.
NOTE Trigger Delay is not available in Video trigger mode, so turning Video on turns off
Trigger Delay, but preserves the value of Trigger Delay.