|  | Its thermistor
   inputs, split into 4 quadrants, enters via its front panel.  There are 10 (10) channel control
   boards in this unit, along with a Xilinx zero card.  All the unitÕs power supplies are
   house in here.  The indicator
   LEDs on the front panel light when the desired length change is
   acquired.  The output signals
   are routed out the rear of the Unit and connect to their respective Driver
   Units. 
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