I am using NI Signal express for observing signal from a Hamamatsu AvAlanche photodiode (APD) using a BNC for data readout. The signal is weak and could be observed only when the data acquisition time is increased. Currently I am seeing the the voltage fluctuations in real time (continuous mode). Please help in understanding how signal express works and how can I change the data acquisition time (say 10 seconds for example).
