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 Ha produced, the effective field H acting in the cylindrical sample will be
H = Ha-NM or H = Ha-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=C1HaH ------------(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 AC H + ASJ
The signal l2 induced in the pick coil is proportional to dΦ/dt. This after integration gives
l3 = C3 Φ = C3 μ0 ACH+C3ASJ ------------(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)