Hi you gave me an idea, Thanks! By the way the disc brake is just for stopping the roller and not for loading, this is an inertia type dyno.I think if you could take your circuit to a frequency generator at a nearby college or something, you could most likely calibrate it with a much more accurate signal and have a lot more confidence in your readings. It would also verify the circuit works as expected and you don't have any poor connections or shorts before trying to troubleshoot any problems when it is installed on the dyne.
Have you considered how the non-linearity of the disk brake as it heats up will affect your readings as you load the motorcycle?
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