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diyAudio Member

Registered: January 2004
Location: away
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Here are the same three inductors, but this is the series resistance of the coils. Note that the free air coils start to climb in the 2 to 3 KHz range, while the ones against the copper foils start to rise in the 400 to 500 hz range. The meter is seeing the eddy current losses in the pcb copper and reporting it as part of the Rs of the inductors.
Date: Mon December 23, 2013 Views: 3624
Filesize: 27.0kb, 210.1kb Dimensions: 2200 x 1700
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Keywords: inductor_R_characterization
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diyAudio Moderator

Registered: November 2002
Location: Athens-Greece
Posts: 3,905
Thu December 26, 2013 4:55pm

If the copper foil is electrically floating wrt test apparatus, we should expect capacitive coupling adding to the picture.
If we short the copper with the guard of the test apparatus, capacitive coupling is eliminated and only inductive coupling (eddy current) effects remain.

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