8 Trigger
8.1 Trigger
For any given Trigger, Gate, or Periodic Sync source, the same Trigger Delay is used
for the Trigger source in the Trigger menu, for the Gate source in the Gate Source
menu, and for the Periodic Sync source in the Periodic Sync Src menu.
Negative trigger delays can be used. Negative trigger delay makes intuitive sense in
time domain and works well in FFT mode where the bandwidth of the filter before
the video trigger is about 1.25 span. You can use negative delay to pre-trigger the
instrument in the time domain or FFT, but not in swept spans. Video trigger delay
may be set to negative values, in time domain, FFT and even swept, but in swept
spans, negative settings of Trig Delay are treated as a zero setting within the
internal hardware and the advisory message "Neg. Trig Delay unavailable in Swept
Mode, zero delay used." is generated when such a delay is set.
Remote Command
:TRIGger[:SEQuence]:<trig_source>:DELay <time>
:TRIGger[:SEQuence]:<trig_source>:DELay?
where <trig_source> is one of:
LINE | EXTernal1 | EXTernal2 | EXTernal3 | AEXTernal | VIDeo | ADC | RFBurst | FRAMe | LEVel | FMT |
IQMag | IDEMod | QDEMod | IINPut | QINPut | AIQMag | PXI | INTernal
Example
:TRIG:VID:DEL:STAT ON
:TRIG:VID:DEL 100 ms
Dependencies Only appears when Video, Line, External 1|2, RF Burst, Periodic Timer or an I/Q trigger is selected as
the Trigger Source
Couplings When FMT Trigger Criteria is INSIDE or OUTSIDE, FMT Trigger Delay State is forced to OFF
FMT Trigger Delay MaxValue is dependent on the current AcquisitionTime. The equation is: MaxValue
= 2^16 x AcqTime, but never to exceed 70 sec. Ex: In PVT View with a min PVT Acq Time of 200 us,
this Trigger Delay MaxValue is 13.26 sec. In RT Spectrum and Spectrogram with a min Acq Time of
100 us, this Trigger Delay MaxValue is 6.55 sec. When the Acq Time is increased, this MaxValue also
increases
State Saved Saved in instrument state
Annotation Trig Delay (in the Measurement Bar)
Backwards
Compatibility
Notes
For backward compatibility with VSA/PSA comms apps
:TRIGger[:SEQuence]:IF:DELay
:TRIGger[:SEQuence]:DELay
The legacy :TRIGger[:SEQuence]:DELay command affects the delay for the VID, LINE,
EXT1, EXT2, and RFB triggers
Auto Function
Remote
Command
:TRIGger[:SEQuence]:<trig_source>:DELay:STATe OFF | ON | 0 | 1
:TRIGger[:SEQuence]:<trig_source>:DELay:STATe?
where <trig_source> is one of:
LINE | EXTernal1 | EXTernal2 | EXTernal3 | AEXTernal | VIDeo | ADC | RFBurst
| FRAMe | LEVel | FMT | IQMag | IDEMod | QDEMod | IINPut | QINPut | AIQMag |
PXI | INTernal
Preset
OFF
Short Range Comms & IoT Mode User's &Programmer's Reference 2344
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