Hi
I believe we are talking about material impedances here rather than electrical
impedance. One of the
weird things about this is that frequency (as in frequency accuracy) *can* be a
contributor to the resultant
error. Thus my original question about just what the concern actually is…..
Bob
Hi Daniel:
If you're concerned with accuracy of impedance measurements you might want to spent a lot of time studying "The
Impedance Measurement Handbook", it's the bible for this. The way the measurement is made has a huge impact on the
accuracy. For example using a vector network analyzer t
On Sat, 7 Apr 2018 22:54:42 -0300
Daniel Mendes wrote:
> I´m a long time time-nuts lurker (I posted here just a dozen times). I make
> a few impedance measurement systems for material analysis (i´m a single man
> shop doing custom hardware for clients). Usually they´re based around a
> STM32F4 /
Hi
I’m not at all sure that the clocks will really get into the measurements. The
PLL does
have jitter, but it has zero frequency error.
One way to get around the whole issue is to use an outboard device with its own
clock.
400 KHz is a bit high for the integrated audio ADC / DAC parts. Drop
I´m a long time time-nuts lurker (I posted here just a dozen times). I make
a few impedance measurement systems for material analysis (i´m a single man
shop doing custom hardware for clients). Usually they´re based around a
STM32F4 / F7 microprocessor: DAC generates sine signal (1-400KHz), ADCs
mea
