This post is related to a previous one, where I managed to get pulse-width mode working with EXT but I was using a 10kHz square wave as the trigger signal: topic11977.html
Now I'd like to trigger off of a single ~40us long pulse. It works fine with channel A or B as the trigger input but when trying to use EXT, weird things happen. I've attached a psdata file showing the scope set to trigger only for pulses less than 10us on EXT. However, the scope triggers for a 100us long pulse as shown (pulse generator output connected with a T to channel A and EXT). Not sure what the EXT input is doing to mess this up.
Any help? Thanks