MishuRF
Automotive
- Jun 14, 2009
- 4
Hello all,
I have one question related with measuring ferrite coils, unknown values(in the area of 1mH to 4 mH). I need the resonant frequency (arround 125kHz) with les than 1KHz accuracy. There is an ideea of creating a field with a signal generator(sweep freq @ 125KHz) and a known coil resonating at this frequency , than receiving with an other coil and a multimeter the signal strenght from this coil and making a calibration of the results(calibrating the system exactly like S21 VNA calibration). Than introduce the unknown coil between the both known coils and from this new results extract the datas for this new coil.
This measurement is very easy to be done also with VNA, but I need a much simple solution and cheap.First method requires signal gen,a good multimeter and some software,which is not the cheapest way.
Ideas?
Thank you in advance.
Mihail
I have one question related with measuring ferrite coils, unknown values(in the area of 1mH to 4 mH). I need the resonant frequency (arround 125kHz) with les than 1KHz accuracy. There is an ideea of creating a field with a signal generator(sweep freq @ 125KHz) and a known coil resonating at this frequency , than receiving with an other coil and a multimeter the signal strenght from this coil and making a calibration of the results(calibrating the system exactly like S21 VNA calibration). Than introduce the unknown coil between the both known coils and from this new results extract the datas for this new coil.
This measurement is very easy to be done also with VNA, but I need a much simple solution and cheap.First method requires signal gen,a good multimeter and some software,which is not the cheapest way.
Ideas?
Thank you in advance.
Mihail