Quote:
Originally Posted by russell_w_b
If it's a single-layer evenly spaced inductor you can get a reasonable value (about 1%) with nothing more than a tape-measure or rule, using Nagaoka's formula.
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This is something I learned from my construction of the circuit I posted: for a largish air-cored inductor, yes, Nagaoka is incredibly prescriptive. But I had to go through the process.
And to get there, I calibrated the tester with commercial small axial inductors in the sub 10uH->1mH and found them to be rather scattered around their marked tolerances.
When you talk of a tape measure, I imagine rather larger inductors as in tank coils of high-powered commercial transmitters.
yes?