I am having some troubles reading a BPW34 with a with PCI-6251 and BNC 2110. I connected the diode directly to the BNC board AI0 connector and I am monitoring the signal with LabView. However, the signal is not as smooth as the one I see when I connect the the diode directly to an oscilloscope. How can I improve the reading on the NI board? Should I amplify the photodiode?