BH-Curve Hysteresis

When a cylindrical sample is placed coaxially in a periodically varying magnetic field the magnetization in the sample also undergoes periodic variation. This variation is packed up by a coil placed coaxially with the sample.
For the uniform field H_a produced, the effective field H acting in the cylindrical sample will be
H = H_a-NM or H = H_a-NJ/μ₀ ------------(1)
where M is magnetization, N is normalized demagnetization factor including 4π and J is the magnetic polarization defined by
B = μ₀ H + J
with B = μH or μ₀ (H+M) as magnetic induction. The signal corresponding to the applied field, Ha can be written as
e1=C₁H_aH ------------(2)
where C1 is a constant
Further the flux linked with pick coil of area AC due to sample of area A S will be
Φ = μ₀ A_C H + A_SJ
The signal l2 induced in the pick coil is proportional to dΦ/dt. This after integration gives
l₃ = C₃ Φ = C₃ μ₀ A_CH+C₃A_SJ ------------(3)
Taking into consideration equation 1, 2 and 3 the electronic circuit is made to trace Hysteresis loop.

Features:

• No need of external sensors and costly Laptop/PC.
• Variable input Frequency 5 to 500Hz
• Variable Input Voltage 0 to 10V
• Modular approach
• Easy to use.
• Different input and output voltage graph.

Objectives:

• To find hysteresis loop of an iron core.
• To find corrosivity and retentivity of an iron core.
• To show the effect of varying voltage and frequency on hysteresis loop.

Technical Data:

• Power Supply : Variable Input Frequency (5-500Hz) and voltage (0-10V), 3 types of graph plotting in XY mode of CRO. BNC and 4mm connector, 220V, 50Hz AC, output ± 12 V, 3PIN DIN
• Coils : Coil 300 turns, Wire Cu. 19SWG,
• Sample : Ferromagnetic core, U-Core 150 x 130mm (LxH), 40 x 40mm, I-Core 150mm(L), 40x40mm

Scope of Delivery:

• 1 BH Curve Power Supply
• 1 I Core
• 1 Pair of Coils, 300 turns
• 1 U Core
• 2 pair of Flexible lead Yellow (100 cm)
• 1 Pair of Flexible lead pair (50cm)
• 1 Pair of BNC to BNC Cable
• 1 Power cord
• 1 Digital Multimeter (801 Auto)
• 1 CRO/DSO (Optional)