TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 defective diodes are replaced, repeat step (2), above, to determine if the generator defect has been corrected. (i) Tag and disconnect the two top leads at terminals 1 and 2 of TB210 (14, figure 11-3).  Read the exciter field resistance at terminals 1 and 2 with a Wheatstone bridge. The exciter stator field resistance should be 10.7 ±10 percent ohms at an ambient temperature of 77°F (25°C). (j) Check insulation resistance with megger between terminals 1 and 2 and the frame (paragraph 11-5a(1)).  Reconnect the two leads. (k) Disconnect generator rotor leads from the rotating diode assembly and measure the field resistance with a Wheatstone bridge.  The resistance should be approximately 1.66 ±10 percent ohms at an ambient temperature of 77°F (25°C). (l) Megger between field leads and frame (paragraph 11-5a(1)). (m) Disconnect diodes and use a double Kelvin bridge to read the resistance between leads on the exciter rotor.  This value should be 0.048 ±10 percent ohms at 77°F (25°C). (n) Check insulation resistance with megger between exciter armature leads and frame (paragraph 11-5a(1)). (o) Check resistance of surge protector  when  disconnected  from one  side  of  generator  field.    Value should  be  1  megohm  or  more  in each  direction.    Check  to  be  sure no  physical  damage  is  evident  on the surge protector. (p) Tag    and    disconnect    the    twelve stator leads to the voltage reconnection   panel   and   measure each of the six stator windings with a Kelvin double bridge. Resistance should be 0.00237 ±10 percent    ohm    in    each    circuit    at ambient temperature of 77°F (25°C). (q) Connect   all   stator   leads   together and   read   between   the   leads   and the generator frame with a megger (paragraph 11-5a(1)). (3) Stator.        Perform    the    following    stator winding short circuit test. (a) Use   an   inside-type   growler,   and test each coil in the stator. Position  the  growler  in  the  stator and  hold  a  thin  metal  strip,  similar to a hacksaw blade, parallel to the core slots. (b) Energize  the  growler  and  explore the    core    surfaces    approximately one  pole  distance  on  each  side  of the  growler.    Continue  testing  one core slot at a time until all coils are tested.    If  the  winding  is  shorted, the   metal   strip   will   vibrate   when held   over   the   slot   containing   the faulty coil. (c) If    the    above    test    is    not    met, proceed    with    the    removal    and repair procedures. 11-9