Oscilloscope images of tig welders - Page 2
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  1. #26
    Join Date
    Nov 2014
    Posts
    42

    Re: Oscilloscope images of tig welders

    Quote Originally Posted by Simclardy View Post
    Do you follow scanner danner?
    I wasn't aware of him but quickly found him on youtube. I checked one video at random that looked like it would be about automotive electronics and found him pulling plug wires off the coils on a running engine to check for spark. That's a great way to ruin a coil since if the HV can't get to the plug a weak point in the internal insulation will feel the full brunt of the max. voltage the coil generates. If it arcs through and a carbon track develops an otherwise-good coil has been unnecessarily turned into toast. Even if it doesn't kill the coil immediately it further weakens the weak insulation, seeding the path to a premature death.

    So, how should he have tested the coils? A battery-powered digital oscilloscope with an inductive probe around the wires would have been the way to do it, taking almost no more time to test the coils properly than pulling the plug wires. Plus, the oscilloscope gives useful diagnostic information in addition to just spark/no spark. There may be good stuff in his other videos but I won't be spending the time to watch them to find out.

  2. #27
    Join Date
    Mar 2018
    Posts
    19

    Re: Oscilloscope images of tig welders

    Quote Originally Posted by MCTig View Post
    I wasn't aware of him but quickly found him on youtube. I checked one video at random that looked like it would be about automotive electronics and found him pulling plug wires off the coils on a running engine to check for spark. That's a great way to ruin a coil since if the HV can't get to the plug a weak point in the internal insulation will feel the full brunt of the max. voltage the coil generates. If it arcs through and a carbon track develops an otherwise-good coil has been unnecessarily turned into toast. Even if it doesn't kill the coil immediately it further weakens the weak insulation, seeding the path to a premature death.

    So, how should he have tested the coils? A battery-powered digital oscilloscope with an inductive probe around the wires would have been the way to do it, taking almost no more time to test the coils properly than pulling the plug wires. Plus, the oscilloscope gives useful diagnostic information in addition to just spark/no spark. There may be good stuff in his other videos but I won't be spending the time to watch them to find out.
    Not sure which video you watched, but that does not sound right. When he does pull plugs he will hold an incandescent tester to give the spark a safe path. He is an instructor at rosdale tech and is all about proper diagnosis. You will be hard pressed to find anyone with as much information and detail as scanner danner when it comes to scopes and engine diagnostics.
    If you do let me know.




    Sent from my SM-G930V using Tapatalk

  3. #28
    Join Date
    Nov 2014
    Posts
    42

    Re: Oscilloscope images of tig welders

    Quote Originally Posted by Simclardy View Post
    Not sure which video you watched, but that does not sound right. When he does pull plugs he will hold an incandescent tester to give the spark a safe path. He is an instructor at rosdale tech and is all about proper diagnosis.
    He has a lot videos and I just picked one at random so I can't tell you which one it was. But, he definitely didn't give the spark any alternative but to try to escape through the insulation of the coil. I didn't realize he was an instructor. That makes what he did even worse.

  4. #29
    Join Date
    Mar 2018
    Posts
    19

    Re: Oscilloscope images of tig welders

    Quote Originally Posted by MCTig View Post
    He has a lot videos and I just picked one at random so I can't tell you which one it was. But, he definitely didn't give the spark any alternative but to try to escape through the insulation of the coil. I didn't realize he was an instructor. That makes what he did even worse.
    I never saw him do something like that so i can't comment on what you saw. But i agree that you should never pull a plug on a waste spark system and hope for the best. The super high voltage will cause problems when seeking its path.


    Sent from my SM-G930V using Tapatalk

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