I have done both the lehman approach (measuring duty cycle) and the lc tank approach (measuring frequency). As I was more interested in measuring low inductance (<100uh), the lc tank approach made more sense to me and the measurement cycle (time duration between successive measurements) can be so short that averaging is transparent to the user.
the lc tank approach is stable to the fourth digit, and the lehman approach is stable to maybe the 3rd digit. Both approaches are highly dependent on the gates used and supply voltage. the lehman approach requires extensive calibration.
Both will work if you don't need precise measurement of inductance.
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I have done both the lehman approach (measuring duty cycle) and the lc tank approach (measuring frequency). As I was more interested in measuring low inductance (<100uh), the lc tank approach made more sense to me and the measurement cycle (time duration between successive measurements) can be so short that averaging is transparent to the user.
the lc tank approach is stable to the fourth digit, and the lehman approach is stable to maybe the 3rd digit. Both approaches are highly dependent on the gates used and supply voltage. the lehman approach requires extensive calibration.
Both will work if you don't need precise measurement of inductance.
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