Need help with Relaxation Oscillator with Parasitic Capacitance
Tomas,

You can measure the parasitic capacitance by removing the capacitor to be measured, leaving only parasitic capacitance in the circuit. This way, you will know the value of the parasitic capacitance.

Now, when you add in the capacitance to be measured and you obtain the result, you can subtract the parasitic capacitance. This will leave you with the correct value of the target capacitance