How to measure small resistance with magnetoelectric instrument?
Working principle: when the coil is filled into a small current when the magnetic field is the current force, will deflect, and spring is also a spring coil, deflection, hairspring produces a reverse torque, the coil will finally stop in one place. Can prove that the rotation angle and current the coil is proportional.
The structure of magnetoelectric instrument is: there is a permanent magnet and a coil rack up by two hairsprings.
It is widely used to measure various kinds of weak DC current. It can be used to measure DC voltage, measure AC voltage after rectifier device, etc.If used to measure the resistance, as long as is a magnetoelectric instrument connected to a DC power supply, when measuring resistance, resistance in series circuit to produce small current, magnetic pointer and deflection, if already on the table for calibration, it correctly display the measured resistance value, but to be measured the resistance is not easy too.
