Hi there,
I am attempting to record an analog signal from a fiber-optic cable. The output voltage should vary with bending or compressing the fiber-optic cable. I'm sending 5V to the transmitter, then wiring the signal output from the receiver to the A0 input port. Typically, I then attach what I believe to be a ground signal to the A GND port on the NI board. When I do this, I record voltages around 1.2V, however these voltages are not very sensitive to bending or compressing the cable, and there is a good deal of noise. When I only use the 5V and A0 ports, however, I get a voltage closer to 5V that is quite sensitive to bending or compressing the cable. Could anyone point me in the direction of what I might be doing wrong? Do I need to be wiring the 5V, A0, and A GND?
Thanks,
Danny
