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How to connect a Silicon Photodiode to NI USB-4431.

Dear Sir,


I am planning to apply NI USB4431 and read the voltage signal from a Mounted Silicon Photodiode (SM1PD1A) with Cathode Grounded. The photodiode is connected with a bias voltage and a capacitor as shown in the following link,


1. Do I need an additional T-joint with a 50Ohm to connect the photodiode to the NI USB-4431?


2. I am interested to find a voltage difference of 2.25V wrt the shield of the NI USB-4431 input terminal. Is it normal to find a voltage drop at the input terminal of NI USB-4431?





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