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Photodiode measurement and thermal Drift

Question asked by timf-88 on Jan 11, 2013
Latest reply on Jan 14, 2013 by OliverSedlacek

Hi All,

 

I attached a schematic of a circuit I am using to measure a high voltage signal. The signal is buffered through the optocoupler (Avago HCNR201) and then goes through the shown signal buffer. I am getting a lot of thermal drift with the circuit (Using Analogs AD823ARZ Opamp), and was wondering what is most likely to be the culprit, the opamp, opto, or resistors.

 

Thanks,

Tim

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