MFG-2000 Series User Manual 
182 
3.  To select the trigger source, 
press F1 (Internal), F2 
(External) or F3 (Manual). 
4.  Press Return to return to the 
previous menu. 
Using the Internal source will produce a 
continuous sweep using the sweep time settings.  
With an external source, a sweep is output each 
time a trigger pulse (TTL) is received from the 
TRIG input terminal on the rear panel.    
The trigger period must be equal to or greater than 
the sweep time plus 1ms.  
5.  If manual is selected, press F1 
(Trigger) to manually start 
each sweep.