Hi again,
An Owon 2202S scope is mounted on the dash and connected to spark
plug wires 3 & 4 of my Honda now.
The picture here is from that setup.
https://en.wikipedia.org/wiki/Ignition_system#Electronic_systems
Click for a bigger view.
My speculative hypotheses:
* deeper pulses are ignitions. Shallower are cross-talk,
* cylinder 4 sparks 1/4 cycle after cylinder 3.
What are your interpretations?
Very limited until more is known about the setup.
Number one, what are you trying to learn?
Meanwhile, here are some sanity checks:
Is the shape of the waveform reasonable?
Is the amplitude reasonable based on the
probe attenuation?
Do the signals go away when disconnected from the 'scope?
Do the signals go away when the probes are shorted to ground?
Do the signals look the same when measured on a single plug?
Does measured amplitude decrease smoothly as the clamps are
opened on the wires?
If all the answers are yes, then your interpretation is
reasonable. It might even be correct 8-)
If you have the option of using a pulse transformer to
measure the spark current that might be easier to
deal with. Less noise, better calibration stability.
Voltage and current measured simultaneously are the
most persuasive measurement.
hth,
bob prohaska
| Date | Sujet | # | Auteur | |
| 9 Mar 26 |  Monitoring ignition on a 1990 Honda Si. | 4 | peter | |
| 10 Mar 26 |  Re: Monitoring ignition on a 1990 Honda Si. | 3 | bp | |
| 11 Mar 26 |  Re: Monitoring ignition on a 1990 Honda Si. | 2 | peter | |
| 13 Mar 26 |  Re: Monitoring ignition on a 1990 Honda Si. | 1 | bp |
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