Hi Ross,

Thanks for stopping by.  

Once you have an image prepared, you can send it to me and I can host it on my server or you can upload it to your own personal web space (you probably have some that came with your ISP account).  Then it is simply a matter of typing the URL location of the image in the message window, highlight and push the 'Insert Image' button.  This makes the URL appear between two img bracket sets.  That posts the image here.  800x600 works best.

For best secondary results, be sure to turn samples all the way up to 32,000.

To move the waveforms on the PicoScope screen simply use the vertical multiplier at x1.  This makes the vertical scroll bars appear on the sides.  Like this:

Hi Ross,

My definition of a dumb question is a question you already know the answer to.  Only instructors ask dumb questions 

The residual energy oscillations that occur after the spark would only be present on the coil wire.  After the spark is done, there is no activity on the plug wire since you are after the rotor gap.  This would be true of activity before the spark as well. 

To sync your secondary capture so you can identify cylinder specific activity, here are a couple of options.

1.  Use the coil wire and the other secondary pickup using the other channel on a plug wire and trigger from that counting over in the firing order.  You can also use an inductive clamp like an RPM 80 that comes with your DVOM for RPM measurements.  It might look something like this:



The top one is the inductive trace from #1 (vertically expanded x5)  The disadvantage if this method is that you divide your sample rate in half because you are using both channels.

2.   Use the inductive clamp on the external trigger.  This way you can devote all your samle rate to one channel while still syncing to a plug firing event.  The external trigger is a fixed positive trigger.  You cannot adjust it.  Therefore the capacituve secondary pickup won't work here because it has a negative going output.