Induction Determinations
Induction is calculated from the net cross-sectional area of the specimen. Net area is determined from the actual weight of the specimen and the assumed specific grav- ity values (as specified by ASTM). Designers may approximate net area by multiplying gross area of the compacted core by its lamination factor, expressed as a decimal. A-C induction is calculated from voltage
measurements made on an unloaded secondary winding using an average-responsive (rectifier-type) A-C voltmeter.