The MX winch is a logging hoist capable of positioning a geophysical probe or other tools in a borehole.  The system is equipped with slipring and connections through which surface instrumentation can communicate with the probe.  A precision measuring wheel and rotary encoder are also included to allow the amount of cable played out to be tracked.   The cable is automatically wrapped on the drum in even layers through the level wind mechanism.  The motor is controlled by a 110V (or 220V depending on the model) four-quadrant motor speed controller that allows the speed to remains constant with a varying load and prevents overhauling with heavy loads. The winch is designed to be used with the MGX II console or MATRIX and a portable PC to comprise a complete logging system.  Dynamic electronic brake is a standard item, with a mechanical (disc) brake optional.