jonnybgood
Full Member level 4
Hi,
I need to measure the dc resistance of an inductor by passing a sinusoidal signal through it while in series with a known resistor. I will know the voltage without the inductor in the circuit and then measure the voltage with the inductor introduced. The frequency will be 100khz or so. (if it is variablle 70k-120khz better) I had in mind an spi dds generator and maybe a digital gain amplifier to adjust the gain according to the read voltage on the adc. I had in mind to measure the peak voltage of the signal to be able to find the new resistance. What is the best method to measure the peak of a 100khz sine signal. I am using PIC24F with 32Mhz crystal and it has a 500Ksps adc.
How do you recommend tackling this so I can start doing some research? I will only consider small value inductors 1uH-10mH.
My friend suggested using PWM and using active filtering on it and even to read with the adc.
I need to measure the dc resistance of an inductor by passing a sinusoidal signal through it while in series with a known resistor. I will know the voltage without the inductor in the circuit and then measure the voltage with the inductor introduced. The frequency will be 100khz or so. (if it is variablle 70k-120khz better) I had in mind an spi dds generator and maybe a digital gain amplifier to adjust the gain according to the read voltage on the adc. I had in mind to measure the peak voltage of the signal to be able to find the new resistance. What is the best method to measure the peak of a 100khz sine signal. I am using PIC24F with 32Mhz crystal and it has a 500Ksps adc.
How do you recommend tackling this so I can start doing some research? I will only consider small value inductors 1uH-10mH.
My friend suggested using PWM and using active filtering on it and even to read with the adc.