jamesg wrote:A series of impulses at around 30 Hz, if it's like more recent machines: three magnets and a coil. The wheel spins (guess) at 500 to 700 rpm.
This is a slight drift, but related to the OP's question, so hopefully he won't mind:
Given what I assume to be a fixed sensor coil and the three magnets that are on the flywheel, what's the difference between models, say C vs D or E?
I ask because I recently upgraded my Model C from a PM 2+ to a PM 3, and when I first connected the PM 3 to the sensor wire and rowed a few strokes nothing happened - I had forgotten that I had to change the model setting on the PM 3 to "C." I did that, and everything's been fine. The fact that the PM 3 needs to know what model it's on suggest that there must be some differences between the sensing hardware from model to model rower.