Hall Effect Experiment

Hall Effect Experiments Manufacturers in Roorkee

Introduction

When a current-carrying conductor is placed in a magnetic field perpendicular to the current direction, a voltage develops transverse to the current. This voltage was first observed in 1879 by Edwin Hall and the effect is called Hall Effect.

The Hall effect has since led to a deeper understanding of the details of the conduction process. It can yield the density of the charge carriers as well as their sign. The hall voltage for p-carriers has opposite sign from that for n-carriers. Therefore if a semiconductor with p-type doping is gradually heated up, more and more electrons from its valence band will go to conduction band. As a result hall voltage would fall rapidly with temperature and even become zero or change sign. At the point of zero Hall Coefficient, it is possible to determine the ratio of mobilities b=me/mh. The Hall coefficient inversion is a characteristic of only p-type semiconductors.

Hall Effect Experiment consists of the following

The set-up consists of the following.

1. Hall Probe (Ge: p-type), HPP-RM-33
Ge single crystal with four spring type pressure contacts is mounted on a glass-epoxy strip. Leads are provided for connections with the current source and Hall voltage measuring devices.
Oven
It is a small oven which could be easily mounted over the crystal or removed if required.
Temperature Sensor
Cromel-Alumel thermocouple with its junction at a distance of 1mm from the crystal.

2. Hall Probe (without sample), HPP-RM-33NS

Same Hall Probe at HPP-33, except that it comes without sample, to enable the user to mount their own sample.

 

 

3. Hall Probe (Ge Crystal), HPN-RM
Ge single crystal with four spring-type pressure contacts is mounted on a sunmica-decorated bakelite strip. Four leads are provided for connections with measuring devices.
Technical details
Material : Ge single crystal n-type Resistivity : 8-10W.cm
Contacts : Spring type (solid silver)
Zero- Field potential : <1mV (adjustable) Hall Voltage : 25-35mV/10mA/KG

4. Hall Probe (Si Crystal), HPSi-RM
Si single crystal with four spring-type pressure contacts is mounted on a sunmica-decorated bakelite strip.
Four leads are provided for connections with measuring devices.
Technical details
Material : Si single crystal n-type Resistivity : 14-15W.cm
Contacts : Spring type (solid silver)
Zero- Field potential : <1mV (adjustable) Hall Voltage : 25-35mV/10mA/KG
This probe is very similar to HPN-RM.

5. Hall Probe (without sample), HP10-RM.
Same Hall Probe at HPN-RM, except that it comes without sample, to enable the user to mount their own sample of 10x10mm size.

6. Hall Probe (without sample), HP05-RM.
Same Hall Probe at HPN-RM, except that it comes without sample, to enable the user to mount their own sample of 5x5mm size.

7. Hall Effect Set, DHE-RM-150.
The set-up, DHE-RM-150 consists of two sub units to handle the probe parameters (probe current and hall voltage) and measurement of temperature. While the probe current is generated and measured by a constant current power supply, the hall voltage is measured by a high input resistance microvoltmeter. The probe current and hall voltage are both displayed on a 16 x 4 line LCD display. The sample temperature is controlled by a microcontroller based PWM heater current source. Thermo emf of the thermocouple is converted into temperature and is displayed on the same 16 x 4 line LCD display on the panel. Temperature range is ambient to 100C and resolution is 1 .

(a) Digital Millivoltmeter Specifications
Range : 1mV, 10mV, 100mV, 1V & 10V with 100% over-ranging. Resolution : 1mV
Accuracy : ±0.2% ±1 digit
Stability : Within ±1 digit
Input Impedance : >1000MW (10MW on 10V range)
Display : 3½ digit, 7 segment LED with autopolarity and decimal indication

(b) Constant Current Power Supply Specifications
Range : 0-20mA, 0-200mA
Resolution : 10mA
Accuracy : ±0.25% of reading ±1 digit
Display : 3½ digit, 7 segment LED with autopolarity and decimal indication

5. Electromagnet, EMU-75T (75mm pole dia; 1.4T at 10mm airgap)

6. Constant Current Power Supply, DPS-175-C2 (Suitable for Electromagnet EMU-75T)

7. Digital Gaussmeter, DGM-202-C1 (For measurement of magnetic field)

Optional Attachments
This model of Hall Effect Experiment may be connected to a computer for data logging purposes. Necessary hardware and software can be ordered with the system.

The setup is complete in all respect.

Contact us

Search