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Home » Physics Laboratory Instruments   »   Universal B-H Curve Tracer
Universal B-H Curve Tracer

Theory In the conventional techniques of tracing the B-H loop, one has to wind a primary and a secondary coil on the specimen and experiment with it.

 
Universal B-H Curve Tracer Universal B-H Curve Tracer
Code: UBHCT-001
Objective: 
 
  • Study of the hysteresis curves of transformer stampings, ferrites and other magnetic materials of different shapes and determination of their energy losses
  • Study of the hysteresis curve as a function of the magnetic field. Determination of saturation, magnetization, remanence and coercivity of magnetic materials
  • Determination of saturation, magnetization, remanence and coercivity of magnetic materials
 
Theory In the conventional techniques of tracing the B-H loop, one has to wind a primary and a secondary coil on the specimen and experiment with it. This method is not convenient for a quick study of the shapes of B-H loops of different materials. The present technique can be used to study B-H loop by simply inserting the specimen in a magnetizing coil. It makes use of a specially designed integrated circuit probe to measure the flux density B. The current flowing through the magnetizing coil develops a potential difference across the resistance R which deflects the beam in the X-direction. The deflection is proportional to the magnetic field H which is given by:
 
  
 
where N is the no. of turns of the coil, R the resistance in series with the coil i.e. resistance between terminals G & H and L is the coil length in meters. VX is the voltage applied to the X-input of the CRO. The probe has a sensitivity of 5 mV per Gauss. Hence 
 
    
 
 
where Vy is the voltage applied to the Y input of the CRO 
Universal B-H Curve Tracer consists of the following parts:
 
Main Unit consisting of a variable A.C. supply (marked Va.c.), a resistor R in series with a potentiometer (P) and input terminal for the CRO.
Unit housing the I.C. probe with associated circuitry and One magnetizing coil (No. of turns = 300 of SWG26; length of the coil = 0.0323 m).
Samples: 5" nail, ferrite rod and transformer stampings.

 

 
 

 
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