VNA Master™Programming Manual : Spectrum Analyzer Commands : :TRIGger Subsystem
 
:TRIGger Subsystem
This subsystem contains commands related to the triggering of instrument functions for the purposes of synchronization. Related commands appear in the :ABORt and :INITiate subsystems.
 
Trigger Source
:TRIGger[:SEQuence]:SOURce
Description
This command defines the trigger source. IMMediate triggering is the equivalent of free‑run triggering. EXTernal triggering is triggered when a TTL signal is applied to the External Trigger input connector. EXTernal triggering is always done on the rising edge of the signal. It is available only in zero span mode.
Syntax:
:TRIGger[:SEQuence]:SOURce IMMediate|EXTernal|VIDeo
:TRIGger[:SEQuence]:SOURce?
Cmd Parameter
<char> IMMediate|EXTernal|VIDeo
Query Response
<char> IMM|EXT|VID
Range
IMMediate|EXTernal|VIDeo
Default Value
Immediate
Related Command
:TRIGger[:SEQuence]:VIDeo:LEVel
:TRIGger[:SEQuence]:VIDeo:POSition
Front Panel Access
Shift‑3 (Sweep), Triggering, Source
 
Video Trigger Position (time)
:TRIGger[:SEQuence]:VIDeo:DELay
Description
This command sets the video triggering delay as either a percentage of the display or in time units. If setting the delay by time is desired, then time units must be specified when sending the command. The query version of this command returns the video triggering delay as a percentage
Syntax:
:TRIGger[:SEQuence]:VIDeo:DELay <percentage> or <time>
:TRIGger[:SEQuence]:VIDeo:DELay?
Cmd Parameter
<percentage> or <time>
Query Response
<percentage> or <time>
Range
– 100 % to + 200 % (– 1 ms to + 2 ms)
Default Value
– 1
Default Unit
%
Example
To set the delay to 1 ms:
:TRIGger:SEQuence:VIDeo:DELay 1 ms
To set the delay to 1 %:
:TRIGger:SEQuence:VIDeo:DELay 1
Front Panel Access
Shift‑3 (Sweep), Triggering, Source, Free Run|External|Video
 
Video Trigger Level
:TRIGger[:SEQuence]:VIDeo:LEVel
Description
This command sets the video triggering level.
Syntax:
:TRIGger[:SEQuence]:VIDeo:LEVel <amplitude>
:TRIGger[:SEQuence]:VIDeo:LEVel?
Cmd Parameter
<amplitude>
Query Response
<amplitude>
Range
+ 30 dBm to – 150 dBm
Default Value
– 65.0 dBm
Default Unit
Current amplitude unit
Front Panel Access
Shift‑3 (Sweep), Triggering, Level