I am trying to measure the dark current of a photodiode
I have Chathode of the PD connected to 1Meg ohm resistor which is connected to +2V The annode is connected to 0V
I obtain the following measurements Voltage accross Resistor: 1.39V Voltage accross Photodiode : 0.82V
I have assumed that the Dark Current (or indeed any current value) is (2 - (1.39+0.82)) / 1Meg
=> I obtain a dark current of 210nA. This figrue however is less by more than an order of magnitude than that I am expecting.
Is my understaning wrong?
Please don't ask why I have this set up am not using Op-Amp circuity!
Many Thanks
Graeme