Ferroxcube   846T250 - 3E2A   Toroid Core
    -------------------------------------------


   non-coated core

   Outside Dia.   0.870"
   Inside Dia.    0.540"
   Thickness      0.250"

   Effective Magnetic Path Length    2.18"    5.52 cm

   Effective Core Cross Section      0.0418 sq inch   0.270 sq cm

   Al =  3055 mH per 1000 turns   +-20%

   3E2A  Initial Permeability   5000   +-20%
         falls off above about   300 kHz

   3E2A  Saturation  63.2% of maximum
             about 3500 Gauss at  20 deg C
             about 2500 Gauss at 100 deg C
             about 1.0 to 1.5 Oersted

   Curie Temperature   170 deg C


   If you calculate the diameter of the circular Effective
   Magnetic Path Length - what fraction is it of the average
   of the Outside and Inside diameter ?       98.4 %


   What fraction is the Effective Core Cross Section  of
   the cross section calculated as   Thickness times
   (OD - ID) / 2   ?       101 %