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Entry  Wed Jan 14 12:02:04 2009, Stefan Ritt, External Trigger Input requirements tap.jpg
    Reply  Wed Jan 14 13:41:44 2009, Stefan Ritt, External Trigger Input requirements 
Message ID: 3     Entry time: Wed Jan 14 13:41:44 2009     In reply to: 2
Author: Stefan Ritt 
Subject: External Trigger Input requirements 


Another tricky issue comes from the fact that the external TTL trigger and the comparator are in a logical OR. So if the comparator level is set such that the signal is always over the threshold, the trigger is always "on" and the TTL trigger does not have any effect. It is therefore necessary to set the analog trigger level to a very high value in order to make the TTL trigger work. 

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