Ive connected the Pressure Transducer using AC directly into the jackbox, but the signal output from the Pressure Transducer looks funny and has sharp mountain peaks and valley troughs. Why?
This is simple. Your low frequency filter setting (LFF) is too high. Set your LFF to 0.01 Hz. If you can’t set your LFF to 0.01 Hz try a DC connection. There are a few polygraph systems out there that allow you to set your software LFF off or very low, but always have a hardware LFF around 0.1 Hz. Check with your polygraph manufacturer to make sure your hardware amplifier doesn’t have a built-in LFF.
