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About SERVOTEK DC Tachometer Generator part number SU-780D-1 :

-D Series - DC Tachometers with output signal at 45V/1000 rpm.

-A Servo-Tek DC tachometer generator provides a convenient and economical means of converting rotational speed into an isolated analog voltage signal suitable for remote indication and control.

-Combining high accuracy with low driving torque, Servo-Tek tach generators are ideal for use in servo systems. Tach Generators are particularly suited to application in precision integrators and velocity servos, both of which require a highly linear speed/voltage relationships with minimum ripple. DC Tachometer Generators are also excellent rate generators for velocity damping in position servos.