the pulse unit measures the resistance of each lay in the belt. after a learn procedure for the belt length the unit monitors for excessive wear by resistance changes, opens, or short to ground id the vinyl coating is damaged. dont touch the termination blocks if its working or your asking for trouble. one flash on each used termination means everything is ok. unplugging the unit will test it, but im pretty sure there is a test button on the board. these things are very sensitive but once they are in and working you shouldnt have a problem.
