1, understand the basic principle of Hall phenomenon.

2. Learn the basic method of measuring magnetic field with Hall element.

3. Be familiar with some characteristics of Hall element.

Experimental instruments:

Hall effect tester, DC steady current power supply (two circuits), millivolt voltmeter (multimeter DC millivolt file),

Experimental principle: 1879, American physicist hall.

As shown in the figure, a sensitive galvanometer is connected to both sides of the rectangular thin metal plate. When the current I is applied along the long axis, if the magnetic field is applied in the normal direction of the rectangle, the sensitive galvanometer will deflect immediately. This phenomenon is called "Hall effect", and this potential difference UH is directly proportional to the current I and the magnetic induction intensity B, and inversely proportional to the thickness d of the thin plate.

Er = RH? (I×B)÷d

Several physical quantity relations in hall effect;

Lorentz force: F = qvB

Electrostatic force: F = qE= qUH/b (Hall plate width)

Operating current of Hall chip: P4 10

I =nqvbd n: carrier concentration

Bd: Cross-sectional area (left)

V: moving speed of carrier

Hall voltage: KH = 1/NQD (Hall coefficient)

Experimental steps:

1, familiar with the use of the instrument:

2, pay attention to protect the Hall element:

The working current of Hall chip is not allowed to exceed 10mA!

3. Pay attention to the correct operation of the switch to prevent electric shock and electric spark injury.

4, verify the Hall phenomenon:

Hall current, voltage and electromagnet current are measured and their relationship is analyzed.