Recent content by CNC

This may seem like a dumb question, but is a dielectric constant calculated from a measured capacitance normalized to thickness and electrode area, I’m having a brain fart.

I meant to say that the two parallel RC circuits are in series and I'm injecting the signal into one side and measuring the output signal using counter eletrodes all hook together in a coaxial harness, and the source impedance of the generator is ~50 ohms.

The circuitry I have been using is --RC--RC-- where the two RC circuits are in parallel, and the Z'=∑R_k/((1+(ωCR)^2 )) and Z" = -ω∑(CR^2)/((1+(ωCR)^2 )), however upon using this to model the data ie C1=50pF and C2=100pF, R1=R2=1Mohm and sweeping frequency 0.1-100 kHz it is an RC semicircle but...

Using a Voigt model to model the circuit indicates that I should only see one time constant the greater of the two, any reason why experimentally I am seeing the sum of the two time constants?

That last post (#3) should have been the same as #5 "not thanks to myself" and I don't know what the probelm is, I am also having problems logging back in hence the multiple usernames.

I am trying to determine capacitance using impedance spectroscopy with two RC circuits in series with the same resistance (1Mohm) and it seems that the circuit is behaving essentially as two capacitors in parallel so that the reference capacitance (50pF) can be subtracted from the total...