J
Joseph Goldburg
- Jan 1, 1970
- 0
Hi All,
I want to make an impedance measuring device from 0 to 20 KHz.
If I generate |V| at zero phase and I measure |I| at some phase theta
Then |Z| at delta phase = |V| / ( |I| theta) = |V /I| at
(- theta)
But both V(t) and I(t) are digitally sampled.
V(nT) = |V| sin (2 x Pi x nT) and I(nT) = |I| sin (2 x Pi x nT)
n = sample number etc
NOTE --- I can digitally sample V as V(nT) and I as I(nT) as a 8bit
onr 10 bit ADC conversion
Question
How do I get Z = V / I from digital samples and calculate the
magnitude and phase.
I will fix the frequency of V(t) = Sin (2 x Pi X f x t) then sample V
and I using ADC.
You thoughts would be appreciated.
Regards
Joseph
I want to make an impedance measuring device from 0 to 20 KHz.
If I generate |V| at zero phase and I measure |I| at some phase theta
Then |Z| at delta phase = |V| / ( |I| theta) = |V /I| at
(- theta)
But both V(t) and I(t) are digitally sampled.
V(nT) = |V| sin (2 x Pi x nT) and I(nT) = |I| sin (2 x Pi x nT)
n = sample number etc
NOTE --- I can digitally sample V as V(nT) and I as I(nT) as a 8bit
onr 10 bit ADC conversion
Question
How do I get Z = V / I from digital samples and calculate the
magnitude and phase.
I will fix the frequency of V(t) = Sin (2 x Pi X f x t) then sample V
and I using ADC.
You thoughts would be appreciated.
Regards
Joseph