Excerpt from A Ballistic Electro Dynamometer Method of Measuring Hyteresis Loss in Iron, And, Voltage Regulation of Alternators
With the movable coil Of the dynamometer connected to the test coil on the iron, reverse the magnetizing current, I, and note the dynamometer throw, d, a measured current, I, being maintained in the field coils of the dynamometer; next, with the movable coil of the dynamometer connected to the secondary coil of the mutual inductance, reverse the current in the primary coil of the mutual inductance and note the dynamometer throw, d', a' measured cur rent, If, being maintained in the field coils of the dynamometer. The value of B in lines per cm2 can then be calculated from the equation.
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