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  1. #21
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    Re: Pulse transformer output measured vs. calculated?

    O.k., voltage and current are almost in phase now, apparently a DC offset of the Rokowski measurements is causing a ramp in the current display, should be zeroed out.



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  2. #22
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    Re: Pulse transformer output measured vs. calculated?

    Quote Originally Posted by FvM View Post
    O.k., voltage and current are almost in phase now, apparently a DC offset of the Rokowski measurements is causing a ramp in the current display, should be zeroed out.
    Whats the reasoning for that the ramp should not be there? The trace in post #20 is the integrated result, the raw di/dt output is as below scope trace and does not show any DC offset. Here is a picture of my rogowski coil, I peeled of some of the shielding so you can see inside. Yes I know the shielding adds capacitance, but when I put it on it didn't make any visible difference to the trace and it does prevent some noise. And the shielding is not closed so it doesn't form a closed ring.

    Click image for larger version. 

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    raw di/dt output
    Click image for larger version. 

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    Last edited by Swend; 19th August 2019 at 09:23.



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  3. #23
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    Re: Pulse transformer output measured vs. calculated?

    what is the amp scale of the trace?



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  4. #24
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    Re: Pulse transformer output measured vs. calculated?

    Quote Originally Posted by Easy peasy View Post
    what is the amp scale of the trace?
    I don't think there is one

    Click image for larger version. 

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    You only get the current after integration, see post #20



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