impedance measurement is not accurate

mjmeli / arduino-ad5933

A simple library for controlling the AD5933 impedance converter system with an Arduino compatible device.

MIT License

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impedance measurement is not accurate #21

Open zifaum opened 2 years ago

zifaum commented 2 years ago

Hello sir Thank you for your work sir, I have used your code sample sir. I carried out impedance measurements with Rcal 10kohm and the results showed an accurate 10kohm, but when I took measurements on different resistors the results were far from accurate. my example measured a 200kohm resistor but the results showed around 20kohm. so how to solve this sir?

mkarn3yru96 commented 2 years ago

Hi @zifaum ! did you find a solution for this issue?

Hevaroo commented 2 years ago

Hello @zifaum,

Depending on the setting you have used for the PGA-gain, excitation voltage range and value for Rfb, your limits of measurement (i.e min/max impedance) may vary. Could you please specify these parameters?