I am trying to control an external circuit by setting a voltage on AO1 on the PWR I/O connector. I am set up for an external trigger and change stimulus on my DUT, then supply the trigger to take a sweep. When set up to use the external trigger in this way, it appears that the voltage on AO1 is never updated. If I change the trigger to internal so that the PNA is constantly sweeping, then the voltage on AO1 does appear to change. Is there a way to update the voltage on AO1 while being externally triggered?