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Capacitor's Phase with PmodIA not constant

Question asked by Gagabi22 on Jul 21, 2017
Latest reply on Jul 27, 2017 by JLKeip

Hi,

I'm trying to measure the phase of a 1 uF capacitor with the PmodIA. The phase is supposed to be -90° but the PmodIA measures that the phase increases. I don't know what causes that and I would like to know what is the problem. It works when I measure the phase with the EVAL-AD5933 but not with the PmodIA.

 

RCAL = 20 Ohms

RFB = 20 Ohms

Capacitor = 1 uF

Frequency sweep = 5,000-16,000 Hz

Voltage range = 2Vp-p

PGA gain = 1x

 

Thanx

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