Hi John

Its hard to determine the waveforms, as the timebase & channel settings are not displayed. It is worth opening Pico software first & Then opening your saved waveforms from within Pico. i.e......

File
Open
then choose your saved psdata file.

This will then show the channel settings.

Your red trace appears to be displaying amps, with a scale of -100 to +200 amps?

OOOpps I just noticed your first image & your settings are displayed. Still the point I make is worth noting.

Your timebase is very short & its hard to judge what is happening from such a small snapshot.

Picoscope allows you to capture massive amounts of data & you are not taking advantage of it. I use the analogy of a video recorder (OK SKY+ to you lot ) recording a TV show. If you wanted to know what was happening in an exiting episode of Corrie, then you wouldn't record just a five minute segment from the middle of it. You would set it to record starting five minutes before & ending five minutes after the program finishes, so that you didn't miss a trick.

I know its weird comparison, to think of it like this, but it is a good idea to try to use the same technique when using the scope to study events. You really need to look at components as they are controlled through a range of operating conditions, so that you can understand things more clearly.

Here is an example with just 10 seconds on screen. OK its not an episode of Corrie, but you get the idea. Imagine the confusion that might follow, if you were to snap a few milliseconds in the middle of the following image. Especially the segment where the battery voltage dips. It is clear from the waveform, that the dip is caused by the starter motor load dragging the NBV down. It is only clear, because we can see the bigger picture!

10 second capture (with settings displayed ) .....



Well done though with the captures & managing to post them. A little more practice & you will be away!

HTH

Dave