Hi Dave, Thanks for your most helpful info it makes me realise just how little I know about using a scope. My first problem was how do I upload this after reading the post in Diagnostic Equipment. I did save the data 4 lots in Picoscope in Waveforms with file names. But when uploading to Photobucket it would not recognise the Pico files so I had to open them do a screen dump and copy & paste into Paint & save as JPEG files. How do you get such a beautiful picture instead of a link into your post? Also after saving in Picoscope I could no longer page back & forth through the data as I did record these from cold to hot? All I had was a Image instead of pages of data to replay.

Again admitting my lack of knowledge with the Picoscope I did not know what sort of setup to do for capture so I went Automotive/Charging &Starting/Charging Circuits/Current / Volts (12) v I assumed this would give me the best picture setup as I was dealing with current checking the feed & earth side of the O2 sensor. Aside that I was feeling tight at the time of purchase and only went for a 2 channel scope. So I was not able to include the switching side although there is no problem there. I expect that explains why there is so much hash in the picture. I would also love to know what you used to edit the picture to add your cloud box & arrows.

I guess I need to get on a good scope course but training seems to be relentless at the moment and costing the earth as I am booked on a week’s worth at the end of the month with Autologic. The other problem as I get older is trying to make the old grey matter retain it all, but scoping is definitely is one I want to get to grips with.
John Kennard.