One of these days, I plan on building a meter circuit that also measures inductors and capacitors (like the microchip "Engineers Assistant", but modified to do more).
I had planned on building this little LCRF meter project from EPE Electronics's (UK Magazine) John Becker. I spent a little time with it, but it was kinda buggy and used a PIC processor (which as I understand it, is now virtually obsolete). The method he used for both L/C was to use two different oscillators, one for L and one for C, and inset the DUT into that circuit and measure it's change (like putting one cap in parallel with another). But in his description for the L measurement, frequency wasn't quite enough, and he did something with the phase. Never really figured out what.
After searching on the internet, I found several other methods, but none I particularly l iike. I don't want to have to generate a nice sine wave or anything.
One method I used many years ago to measure capacitors with a frequency counter was to use a constant current source, apply that to the cap, and measure the time it takes to charge (then trigger a flipflop and do the same thing, but on discharge). It worked quite well and produced a very nice triangle wave. But that was around 40 years ago and I can not find my notes on that circuit. I know I have them though, just packed up.
But I'm thinking, I should be able to do (virtually) the same with with an inductor. Has anybody tried this?
Or is there another preferred method for measuring inductors with a micro controller?
Just looking at ideas, and working on the code to make them a reality, just little "mini-projects" so to speak, no real project in the works yet. Any suggestion would be appreciated.