 $29 Oscilloscope, always wanted to see a spark |
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| worn |
 Jul 19 2017, 10:28 AM
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can't remember  Group: Members Posts: 3,156 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest 
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I have had squirrelly ignition problems with the rebuilt 911 and the 2056 teener. In both cases a key problem was that a new part was assumed to be a functioning part. This is electrics, so I should have known better. Having taken LC circuits in physics 40 years ago I figure I know how to push electrons. Again not necessarily so.
At any rate I found an Amazon deal on a oscilloscope kit for $29 shipped. Except the price includes an extra $4 to have it shipped already assembled. I am too old for surface mount soldering (IMG:style_emoticons/default/blink.gif) . And here is the spark trace from the 914:  To get this I made a 1000-1 capacitance probe with a piece of copper pipe and a couple caps and resistors I had lying around. I followed the basic ideas here. https://www.princeton.edu/ssp/tiger_cub/lib...n_waveforms.pdf The basic idea is to put a slit piece of copper tubing around the plug wire with a clothespin and link that to a 1 microfarad capacitor assuming that the tubing is around a picofarad. I used what I had in the bins. At any rate I always wanted to see what the spark was like and hope to be able to use this for better tuning. Someday. I already know that the waveforms aren't even. Haven't spent enough effort to determine how consistent this is - may be a limitation of the number of places available on the screen and thus limited resolution. |
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| Elliot Cannon |
Jul 19 2017, 02:40 PM
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914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None 
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That looks like my last EKG. (IMG:style_emoticons/default/biggrin.gif)
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| worn |
Jul 19 2017, 05:50 PM
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#3
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can't remember Group: Members Posts: 3,156 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest
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QUOTE(Elliot Cannon @ Jul 19 2017, 12:40 PM)  You know, it does remind one of the keg. Which spell check chose to spell as KEG. The spark looks like the QRS complex, which seems appropriate. Hope the ticker is as it should be Elliot (IMG:style_emoticons/default/piratenanner.gif) |
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| worn |
Jul 20 2017, 09:51 AM
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#4
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can't remember Group: Members Posts: 3,156 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest
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QUOTE(worn @ Jul 19 2017, 03:50 PM) QUOTE(Elliot Cannon @ Jul 19 2017, 12:40 PM) You know, it does remind one of the keg. Which spell check chose to spell as KEG. The spark looks like the QRS complex, which seems appropriate. Hope the ticker is as it should be Elliot (IMG:style_emoticons/default/piratenanner.gif) Dammit - I retyped EKG twice! |
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Posts in this topic
worn $29 Oscilloscope Jul 19 2017, 10:28 AM
McMark I've always wanted to get more knowledgable ab... Jul 19 2017, 11:35 AM
crash914 looks like a coil or dwell issue. Not consistent. Jul 19 2017, 07:56 PM worn
looks like a coil or dwell issue. Not consistent... Jul 20 2017, 09:51 AM |
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