(Read-Write) Set and query the source of FieldFox trigger signals.
Relevant Modes
IQA, 5G NR, 5G NR EVM Conducted, 5GTF, SA, LTE FDD, PAA, RTSA
Parameters
<character>
Trigger source. Choose from:
Note: For PAA mode, the only applicable parameters are EXTernal and FREErun.
Note: Trigger Source selection does NOT have an impact on SA STEP sweeps. Trigger source is only implemented for Zerospan, IQ Captures, and FFT type sweeps.
If a Trigger souce is selected when in STEP sweep the instrument displays the following popup message:
FREE - (Free run) Triggering is provided by the FieldFox internal circuitry. A new sweep begins when the previous sweep ends.
EXT - (External) A sweep is triggered on an external TTL signal at the External Trigger connector.
VID - (Video) - (Not applicable for OTA (e.g., LTE FDD, LTE TDD, and 5GTF). Only available for SA, RTSA, and IQA.) - A sweep is triggered on a signal at the SA RF Input connector when the amplitude of the incoming signal exceeds the settable Trigger Level.
RFB - (RF Burst) - (Not applicable for OTA (e.g., LTE FDD, LTE TDD, and 5GTF). Only available for SA, RTSA, and IQA.) - Similar to Video triggering, a sweep is triggered from a signal at the SA RF Input connector. However, an RF Burst trigger is detected in the third IF stage. A sweep is triggered when the amplitude of the incoming signal exceeds the settable Trigger Level.
Note: Learn more about RF Burst in the N9927-90020 User's Guide and N9938-90006 User's Guide.
FRAMe (Periodic) - Trigger repeats at the period rate entered. Periodic trigger’s phase can be altered by the Offset value.
See Also
TRIGger[:SEQuence]:VIDeo:LEVel (SA Only)
TRIGger[:SEQuence]:VIDeo|RFBurst:LEVel (IQA Only)
Examples
TRIG:SOUR EXT
Query Syntax
TRIGger[:SEQuence]:SOURce?
Return Type
Character
Default
FREE