How can one measure particle charge using oscilloscope and op amp integrator circuit along with a capacitor and faraday cup. I am unable to figure out how to approach. I have the circuit ready but when I test the faraday cup by touching a separate charged capacitor, the oscilloscope doesn't show any visible change in voltage. How can I use all these components to get a particle charge. My plan is to drop the particles in the faraday cup and get the output voltage change from oscilloscope. Then calculate the charge with the help of rated capacitor. Also, I don't have any electrometer.
Can I get help with measuring particle charge using oscilloscope ?. Also, how will the voltage waveform look like when oscilloscope detects any voltage ?
I have attached the circuit, maybe you can have a look into it. What I am doing is charging any capacitor (not included in the circuit) with one end grounded (from dc power supply) and then touching the faraday cup. The oscilloscope is not responding to the touch.
Also, when I am turning ON the power for OP-AMP, then even without applying anything to cup, I am getting a voltage at the output. Is this normal ?... Tell me anything in the circuit which needs to be changed or tell me the step by step procedure which can be used for particle charge measurement using the scope.