- #1

andreass

- 16

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I measure real and imaginary part of capacitance C*=C'+iC" (C'=C'(f) and C"=C"(f)).

I did 2 measurements - in first capacitor is directly attached to measuring device, in second I use 1 m coaxial cables to attach it.

I need to get impedance per length for cables.

1. How can I get absolute value of impedance??

1.) |C| = sqrt(C'^2+C"^2) and |Z| = 1/|C|/(2*pi*f) or

2.) Z = 1/(2*pi*f*C*) = (C"-iC')/(2*pi*f*(C'+C")) and |Z| = sqrt(C'^2+C"^2)/(2*pi*f*(C'+C"))

And then, I assume, I can subtract absolute value of |Z| for first and second measurement and I should get impedance per meter for my cables !??