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Capacitance Value from CPE, RParallel: A Calculator

RESOURCES > EIS > CPE > CAPACITANCE from CPE, RParallel

Nyquist for (RQ) This calculator can be used to calculate the "true" capacitance from a depressed semicircle model ( a Constant Phase Element in parallel with a resistor ). 

Fit your data to the (RQ) model. Enter the best fit results for R, Qo, and exponent, n, in the form, below. Press [Convert ...] to update the value of the capacitance.

 

Enter R, CPE parameters:

R

Qo

-s-n

n
(exponent)

1.0 => n > 0.0
n value should be > 0.75 for reasonable confidence in C values

    

Capacitance

Press "Convert..." after you change Capacitance unit.

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The equation used by this calculator is:  C = ( Qo * R )(1/n) / R
It is easily derived from eqn 3 on the ZARC element page once you realize that T=RC.

The equation for the constant phase element assumed by this calculator is:

Z = -1 / [ Qo * ( j * omega )n ]

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