Anritsu MG3641A - Manual (Page 83)

SECTION 4 OPERATING INSTRUCTIONS
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If the trigger program is registered when another trigger program is already registered, the new trigger program is
added to the already-registered trigger program. To register a new trigger program, press the "Clr" [F1] key to erase
the already-registered trigger program before using the "Entr" [F3] key to enter the registration state in Item (2)
above.
When a key is operated while the trigger program is being registered, the function is set as a usual panel operation,
but sweep is not executed. The maximum number of trigger program steps (functions) is 20. A trigger program of
more than 20 steps cannot be registered. If the number of steps exceeds 20, the message "Trigger entry overflow"
is displayed. In this case, open the "Trigger Program" menu and terminate registering the trigger program. Even if
the number of steps exceeds 20, the registration state is not canceled automatically.
If no key is operated for 30 seconds or longer while the trigger program is being registered, the registration state is
canceled automatically. In this case, the trigger program is not registered.
The sweep mode in which sweep is executed in the trigger program is forcibly set to SINGLE sweep.
4.11.3 Executing the trigger program
Execute the trigger program in one of the following ways:
(1) Execution by the external logic signal
Execute the trigger program at the falling edge of the TTL level signal input from the Trig Input connector on the
rear panel. Because this connector is pulled up internally, the trigger program can be executed by simply connecting
the connector to the ground.
(2) Execution using GPIB
The trigger program can be executed by sending the *TRG command or executing the trigger interrupt function
from GPIB.
For GPIB, see Section 6, "Remote control using GPIB."