TESTING DEVICE FOR FERROMAGNETIC MATERIALS Russian patent published in 2009 - IPC G01R33/14 

FIELD: physics.

SUBSTANCE: invention relates to magnetic meters and is meant for measuring static hysteresis loop of products from ferromagnetic materials Testing device for products from ferromagnetic materials contains an electromagnet, in whose front gap is installed a sensing device, induction measure, connected with an integrating amplifier, and also connected with an electromagnet magnetising unit, whose inlet is connected with the outlet of the control unit, two Hall sensors, placed in the front gap of the electromagnet, recording unit, whose first input is connected with the output of the integrating amplifier, the second input of the integrating amplifier is connected to the second output of the control unit, three differential amplifiers. The first and second inputs of the first differential amplifier are connected with the first and second hall outputs of the first Hall sensor, and the first and second differential amplifiers are connected with the first and second hall outputs of the Hall sensor, two analog adders. Both inputs of the first analog adder are connected with the hall outputs of the first Hall sensor, and the first input of the analog adder is connected to the output of the third differential amplifier, the second and third inputs of the second analog adder is connected to the terminals of the first and second differential amplifiers respectively. The output of the second analog adder is connected to the second input of the recording unit, the first input of the third differential amplifier is connected to the first current terminal of the first Hall sensor, and the second input is connected to the output of the first analog adder. The second current terminal of the first Hall sensor is serially connected with the first current terminal of the second Hall sensor. The source of current of the first and second terminals is connected to the first and second terminals of the Hall sensors respectively.

EFFECT: increase in the accuracy of measurement of magnetic field strength.

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