Dynamically measuring magnetic properties of toroidal tape core - feeding prim. and sec. winding voltages to computer and measuring prim. voltage by resistor

摘要

In the dynamic measurement of the magnetic properties of toroidal tape cores, esp. for deriving the hysteresis curve, the primary winding round the specimen takes a magnetising current of adjustable frequency and amplitude which is measurable by the voltage produced in a resistance, while the voltage induced in the secondary winding is a measure of the change in magnetic flux. The analogue values for both voltages are digitalised and stored before being called in at specified intervals and supplied to a computer which directly expresses the magnetic properties. These may be presented in impulse form on a plotter or printed out to show the hysteresis loop. Magnetic flux density can be determined by numerical integration of the induced voltages. The method is quick and produces more precise results than systems using an oscillograph.