I want to measure the resolution of this photodiode op560c when it connected to the 16 bit ADC (NI-DAQ), if I connected in 10k series resistance with the photodarlington and measure the voltage reading across it when I shine 0.03 mW green light (530 nm).
It seems you want to measure SNR.
Define the bandwidth of interest...use an appropriate filter.
Instead of the 10k series resistor (which will degrade AC performance) I'd use a TIA combined with filter.
This gives more defined results especially regarding bandwidth and diode voltage
For your circuit you need a very low noise voltage reference, to get reliable results...in either case.
It seems you want to measure SNR.
Define the bandwidth of interest...use an appropriate filter.
Instead of the 10k series resistor (which will degrade AC performance) I'd use a TIA combined with filter.
This gives more defined results especially regarding bandwidth and diode voltage
For your circuit you need a very low noise voltage reference, to get reliable results...in either case.
Thank you as per your suggestion i have made a circuit PFA, used an opamp as buffer circuit and LM358 as input reference. Do i need filter(I don't have any idea)? or is this configuration is enough.
Planning to varying the LED intensity using potentiometer and simultaneously measuring the LED intensity using bifurcated optical fiber connected between OP560C and Thorlabs powermeter (as a standard device)
Resolution will depend on the original signal strength.
You need to look into the noise specifications. The user has to decide the acceptable signal to noise ratio. If you are passing the photodiode output to a DAC, then the input signal must be much over 2^16 times the noise level so that you can get the 1 bit (LSB) resolution.