The trigger source determines where the trigger signals originate. One of three trigger sources can be selected. This setting works at the analyzer level.
| Trigger Source | Function | 
|---|---|
| Internal [default] | The Analyzer generates a trigger signal automatically when needed. | 
| External (except TR1300/1 model) | A trigger signal is a logic signal at the external trigger input (See External Trigger Settings). | 
| Bus | The trigger signal is generated by a command from the program controlling the Analyzer via SCPI or COM. | 
| 
 | To set the trigger source, use the following softkeys: Stimulus > Trigger > Trigger Source Then select the required trigger source: •Internal •External (except TR1300/1 model) •Bus | 
| 
 | 
 |