The link to the part in the video is here
Around the 20 minute mark, paul uses his multimeter to check the 3 pins on the cam sensor (hall effect).
The signal wire showed 4.99v
The 5v ref was low at just over 3.8v
The ground voltage was high, at 4.22v
All measurements with the sensor disconnected. I get that a bad ground is going to have high voltage. What I am having trouble understanding is how can the ground have higher voltage than the feed to the circuit? I would expect it to be the same 3.8v measured on the ref circuit or lower.
Furthermore, assuming the computer has one internally shared 5v regulator, why would you have a good ref voltage on the signal wire disconnected and not on the feed?
Of course, if all the questions are answered in upcoming parts of the series, feel free to not spill the beans.
NOT related, I enjoyed the format of this video, going back and forth between the projector screen to show the hookups on the car, and the lab scope.
I think I saw one video in the not so distant past where one of the overlays was semi-transparent. I think that would work well when you have the scope traces on the screen, but still want to show what you're doing under the hood.
[Last edited Jul 03, 2016 22:56:39]