14. Calibration

     Calibrates the device. There are five
     functions.
      -- Correct LRV: Calibrates zero point (           LRV).
      -- Correct URV: Calibrates span (URV).
      -- Weight computation: It computes
          the quantity of the weight to use
          when doing the calibration which
          used a weight.
      -- Calculation result: A calculation
          result is restated.
     
     The output changes according to the
     setting of dumping.