Pulse transformer output measured vs. calculated?

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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.
 

FvM said:
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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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.



raw di/dt output
 
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