Chapter 6 Shutter Mode Operation 79
If a PTG is installed in the ST-133 and Internal Sync is selected, the PTG will act as if it
were an external trigger source. In turn, the PTG can be triggered to start by an external
trigger inserted at its Ext. Trig. In. BNC. If you want to use an external trigger to trigger
the PTG, you must go to the PTG|Triggers tab page and enter the characteristics of an
external trigger that, when input at the Ext. Trig. In BNC, will trigger the PTG's internal
pulse.
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