8 Trigger
8.1 Trigger
8.1.1.10 Periodic
When Periodic is selected, the instrument uses a built-in periodic timer signal as the
trigger. Trigger occurrences are set by the Periodic Timer parameter, which is
modified by the Offset and Periodic Sync Src.
Use this trigger when there is a periodic signal but no reliable signal on which to
trigger. You can synchronize the periodic signal with outside events (using the
Periodic Sync Src) to get closer to a reliable trigger signal (see "More Information"
on page 2653 below).
If you do not have a sync source selected (OFF), then the internal timer will not be
synchronized with any external timing events.
The Trigger tab contains the following Trigger Source dependent controls when
Periodic Trigger is selected:
–
"Period" on page 2671
–
"Offset" on page 2671
–
"Reset Offset Display" on page 2672
–
"Sync Source" on page 2673
–
"Trigger Delay" on page 2663
Additional controls are also present that are not dependent on the selected Trigger
Source.
Example
:TRIG:SOUR FRAM
Swept SA measurement
:TRIG:<meas>:SOUR FRAM
Measurements other than Swept SA
Annunciation Periodic (in the Meas Bar)
Spectrum Analyzer Mode User's &Programmer's Reference 2652
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