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What settings when testing secondary ignition using Own VDS1022I and Hantek HT25

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3 years 9 months ago #40508 by GroundLoop
Have an issue with an 1987 Buick Grand National that I thought was fixed but it is still there. www.scannerdanner.com/forum/post-your-re...-no-codes.html#34089

Purchased an Own and Hantek probe. I have:
Timebase = 20ms / div
Channel 1 connected to the CAM HI pin on the ECM set to 5V / div. This comes from the ignition module. Waveform looks consistent
Channel 2 is connected to the Hantek ignition probe on cylinder 2 set to 500 mv /div

Channel 1 looks to my untrained eye to be good. It is a steady constant signal.
Channel 2 looks like there are some major issues.

Are these the correct typical settings. The output file from the Owon is a .CAP. Cannot attach it.

Thanks!

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3 years 9 months ago #40525 by Tyler
Can you send me the .CAP file? wrenchturnsyou@gmail.com

I have no hands-on experience with those probes, but my first instinct is that the polarity may not be correct. Can channel #2 be inverted?

You may have thought of this, but I'd try hooking up to a known good cylinder first, for a baseline.

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3 years 9 months ago #40548 by GroundLoop
I did not try a known good cylinder yet. Will do that ASAP.

The channel can be inverted.

Sent you the file.

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3 years 9 months ago #40562 by Tyler
Is there a preferred program for viewing .CAP extensions? :huh: I tried a couple, and couldn't make it happen.

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3 years 9 months ago - 3 years 9 months ago #40579 by John Curtis
Capacitive pick-ups by design, will show an inverted waveform no matter how you clip it. By inverting it in the software, it becomes right side up

Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
Last edit: 3 years 9 months ago by John Curtis.

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3 years 9 months ago #40599 by GroundLoop
Sent you an email with the link to the software for the Owon.

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3 years 9 months ago #40600 by Andy.MacFadyen
Nearly always but it depends on coil polarity not all systems give the classic negative spark.

" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)



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