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Dear Sir,

Thank you very much for your reply.

Regarding the AD 5933: The AD 5933 has some limitations. First, it doesn't measure impedance automatically. We need to calibrate the AD 5933 each time we measure impedance, which makes it unsuitable for measuring unknown impedance. For calibration, we must use a known resistor with an impedance very close to the unknown impedance value of DUT. This limitation is why I stopped working with the AD 5933.

My circuit's impedance is complex; it consists of a resistor in parallel with a capacitor. When we increase the frequency to measure the sensor's impedance, there is a decrease in impedance with an increase in frequency. that's why i said resistor in parallel with the capacitor

In my case, I don't need to measure the phase angle of the impedance; I just need to measure the sensor's impedance automatically, similar to an impedance analyzer, with a range of 1MΩ to 30MΩ.

The equivalent circuit of my sensor is attached below. Your suggestions on this matter would be highly appreciated.