instrument for magnetic core`s B-H-loop


Posted on Nov 17, 2012

his Design Idea describes a virtual instrument that uses a desktop or notebook computer with an analog data-acquisition card and National Instruments` (www.ni.com) LabView software (Version 7.1 or above). In operation, the software extracts B-H-loop information, core losses, and other magnetic parameters at a reasonable cost per measurement.



Figure 1 shows the test fixture for a magnetic-core-based device. The device, T1, comprises a sample of core material and two windings with equal numbers of turns. A precision current-sensing resistor, R1, samples the excitation current that induces a mag




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