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EVAL-AD5933EBZ  capacitor calculation

Question asked by Famag on Dec 1, 2015
Latest reply on Jan 3, 2016 by mcee

Hallo,

I'm using for first time this kit with software included to check resistor and capacitor.

No problem with resistor.

I don't understand how calculate the capacitor value starting from data software.

Example.

Capacitor 470nF

Test rate from 10Khz to 12Khz

Theoretically the impedance is between 33,9 and 28,2, so I'm using RFB=10ohm  and calibration Z = 10ohm

Software returns this results:


Frequency,Impedance,Phase,Real,Imaginary,Magnitude,

10000 , 10,068976885982 ,-90,4147558880371 ,-2976 ,-336 , 2994,90767804285

10200 , 9,82362561727487 ,-90,3860439850922 ,-3041 ,-347 , 3060,73357220128

10400 , 9,60964911180823 ,-90,1028971825821 ,-3109 ,-368 , 3130,70359504058

10600 , 9,47322831705655 ,-90,0506486432684 ,-3164 ,-392 , 3188,19070947771

10800 , 9,33962710627438 ,-90,1518301482299 ,-3210 ,-408 , 3235,82508797988

11000 , 9,18542581937236 ,-90,3888283916739 ,-3257 ,-421 , 3284,09652720501

11200 , 9,01559985855043 ,-90,6118848104603 ,-3309 ,-425 , 3336,18134998684

11400 , 8,86203264808459 ,-90,5017943814015 ,-3361 ,-440 , 3389,67859833348

11600 , 8,71954469010447 ,-90,380632267353 ,-3415 ,-459 , 3445,70834517375

11800 , 8,62229810122144 ,-90,2911807112437 ,-3454 ,-480 , 3487,19314062184

12000 , 8,53532046464308 ,-90,2820080789796 ,-3488 ,-496 , 3523,08955321888

 

How can I estimate the capacitor value?

Thanks!

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