☆To learn principle of giant magnetoresistance effect;
☆To measure relationship between GMR sensor sensitivity and working voltage;
☆To measure current intensity of electrical wire by GMR sensor;
☆GMR sensor: linear range: 0.15mT-1.05mT, saturated magnetic field: 1.5mT;
☆Sensitivity: 30mV/(V.mT)~42mT/(V-mT);
☆Power supply of sensor: DC1.5V~12V continuously adjustable;
☆Helmholtz coils turns per coil: N=200 turns, inner diameter R=10cm。