I keep running into this issue, and have been waiting awhile before continuing the discussion. I just recently had to verify proper control of an alternator that is controlled via demand by the PCM. I've never really wanted to understand this kind of system design, but gotta work with what you get. I've always liked alternators that are self contained. Anyway, back to the real issue. I still find I'm having trouble getting a good trigger. I had good grounds all at the negative battery terminal. I am using three Pico test leads with all three grounds connected together, and then connected to the negative terminal of battery. I kept the cabling as far away from everything as possible.
Here are two images again. First with filtering off ->
Secondly with the filter ON ->
With the filter on you would not expect to see it triggering on what appears to be nothing. The trigger doesn't coincide with the "filtered" wave pattern.
Is there no way to filter these transients from the trigger? There are times when I would like to be triggered by transients , and then there are times when I'd like to completely disregard them. I'm interesting in timing events and not the noise. Would shielding my cables be the direction I should be going? And if that is the case, please point me to where to get the "right cables". I would love to see an option to not trigger on these transients. I'm looking to speed up my time working on cars with noise. Things like CAM and CRANK readings where yes I want to have the option to see the transients but disregard them in favor of locking a pattern in to verify timing events..