I am trying to wind some coils for a RF transmitter, so to get the values right, I though of using a LCR meter, but there is a problem with the measurements.
If I use air core inductors the measured values don't differ that much when switching from different frequencies of operation. But if I want to measure an inductor with a iron core (from a nail) I get the following results:
- 100Hz: 16uH
- 120Hz: 16uH
- 1kHz: 11.1uH
- 10kHz: 4.59uH
- 100kHz: 1.708uH
I've read somewhere that inductors below 2mH should be measured with 1kHz, so the 100Hz and 120Hz are off, that I can understand. But 10kHz and 100kHz measurement frequencies shouldn't be that much off from 1kHz, shouldn't they? What am I doing wrong?