INSTRUMENT
Setup consists of Electronic Circuity housed in a cabinet. One
specimen of transformer stamping and another sample of ferrite ring
is also supplied. This complete unit requires a C.R.O. to perform
the experiment. The Unit enables one to quickly trace the B-H loop
(hysteresis) of a ferromagnetic specimen using a cathode ray
oscilloscope. A measurement of the area of the loop leads to the
evaluation of energy loss in the specimen.
Principle
There are two windings on the specimen (primary and
secondary). The primary is fed to low A.C. voltage (50 Hz). This
produces a magnetic field H in the specimen. The voltage across R1
(resistance connected in series with the primary) is proportional to
the magnetic field. It is given to the horizontal input of the CRO.
The A.C. magnetic field induces a voltage in the secondary coil. The
voltage induced is proportional to dB/dT (B-flux density). This
voltage is applied to a passive integrating circuit. The output of
the integrator is proportional to B and fed to the vertical input of
the CRO.
B-H
Curve Unit
