Actually guys the best neutral setting on a Machine is same exact speed or RPM at No Load on machine (Exact Balance load in car). An 1/8 of an inch will make 10-15FPM difference. On a generator you need to read the flux from field to get it to zero deflection. If your deflection was positive then move to zero until it goes negative them move back to as close to zero as possible. That should be neutral. I always used a 100 watt resistor from rectifier voltage to energize the field. Also do generator with only 2 brushes in not all 4, then make sure brushes for 4 are quartered. What you are actually doing with the deflection is finding where the generator brushes dissect the flux at center of the field. Mechanical center is a place to start, but can be different then the electrical center thus why you use the deflection. Obviously you have to disconnect generator field wires to apply voltage for deflection since the field in this generator is a self excited field. (No external voltage source other then induction from the leveling field to build up to contract speed). Always used main field wires, never got enough deflection using just leveling field. Also on some larger generators (95 115 1B 2B 3B) Otis will take one pole of the leveling field and make it the comp field for load weighing compensation so you may not have correct fields energized for accurate reading on those units.
