High School Experiment Kits

Providing you the best range of four probe setup resistivity mapping experiments for physics, four probe experiment for physics lab and measurement of magnetoresistance experiments for physics lab with effective & timely delivery.

Four Probe Setup Resistivity Mapping Experiments for Physics

REQUEST CALLBACK

Ask for Price

ATICO Medical Pvt. Ltd. are manufacturer, supplier and Exporter of Four Probe Setup Resistivity Mapping Experiments for Physics


Description & Specification:Four Probe Setup Resistivity Mapping Experiments for Physics Lab - Four probe set-up for mapping the resistivity of large samples The Four Probe Method is one of the standard and most widely used method for the measurement of resistivity. In its useful form, the four probes are collinear. The error due to contact resistance, which is significant in the electrical measurement on semiconductors, is avoided by the use of two extra contacts (probes) between the current contacts. In this arrangement the contact resistance may all be high compare to the sample resistance, but as long as the resistance of the sample and contact resistance's are small compared with the effective resistance of the voltage measuring device (potentiometer, electrometer or electronic voltmeter), the measured value will remain unaffected. Because of pressure contacts, and 2 way motion, the arrangement is specially useful for quick measurement on large samples at room temperature. 

Additional Information:

Item Code: AM-14758

Send Bulk Enquiry

Four Probe Experiment for Physics Lab

REQUEST CALLBACK

Ask for Price

ATICO Medical Pvt. Ltd. are manufacturer, supplier and Exporter of Four Probe Experiment for Physics Lab



Description & Specification:Four Probe Experiment for Physics Lab - Resistivity of Semiconductors by Four Probe Method at Different Temperatures and Determination of the Band-gap The Four Probe Method is one of the standard and most widely used method for the measurement of resistivity of semiconductors. The experimental arrangement is illustrated. In its useful form, the four probes are collinear. The error due to contact resistance, which is specially serious in the electrical measurement on semiconductors, is avoided by the use of two extra contacts (probes) between the current contacts. In this arrangement the contact resistance may all be high compare to the sample resistance, but as long as the resistance of the sample and contact resistances are small compared with the effective resistance of the voltage measuring device (potentiometer, electrometer or electronic voltmeter),the measured value will remain unaffected. Because of pressure contacts, the arrangement is also specially useful for quick measurement on different samples or sampling different parts of the same sample. Description of the experimental setup 1. Probes Arrangement It has four individually spring loaded probes. The probes are collinear and equally spaced. The probes are mounted in a teflon bush, which ensure a good electrical insulation between the probes. 

Additional Information:

Item Code: AM-14757

Send Bulk Enquiry

View PDF

Measurement of Magnetoresistance Experiments for Physics Lab

REQUEST CALLBACK

Ask for Price

ATICO Medical Pvt. Ltd. are manufacturer, supplier and Exporter of Measurement of Magnetoresistance Experiments for Physics Lab

Description & Specification:Measurement of Magnetoresistance Experiments for Physics Lab - It is noticed that the resistance of the sample changes when the magnetic field is turned on. The phenomenon, called magnetoresistance, is due to the fact that the drift velocity of all carriers is not same. With the magnetic field on; the Hall voltage V is given as: which compensates exactly the Lorentz force for carriers with the average velocity; slower carriers will be over compensated and faster one undercompensated, resulting in trajectories that are not along the applied field. This results in an effective decrease of the mean free path and hence an increase in resistivity. Here the above referred symbols are defines as: v = drift velocity; E = applied electric field; t = thickness of the crystal; H = Magnetic field Description of the experimental setup The set-up consists of the following: Four probe arrangement Sample: (Ge: p-type) Magnetoresistance set-up, Model: DMR-11 Electromagnet Constant Current Power Supply, Model : DPS-50 Digital Gaussmeter Four Probe arrangement It consists of 4 collinear, equally spaced (2mm) and individually spring loaded probes mounted on a PCB strip. Two outer probes for supplying the constant current to the sample and two inner probes for measuring the voltage developed across these probes. This eliminate the error due to contact resistance which is particularly serious in semiconductors. A platform is also provided for placing the sample and mounting the Four Probes on it. Sample Ge Crystal (n-type) dimensions : 10 x 10 x 0.5 mm. Magnetoresistance Set-up: This unit consists of a digital millivoltmeter and constant current power supply. The voltage and probe current can be read on the same digital panel meter through a selector switch. (a) Digital Millivoltmeter Intersil 3½ digit single chip ICL 7107 been used. Since the use of internal reference causes the degradation in performance internal heating an external reference been used. Digital voltmeter is much convenient to use, because the input voltage of either polarity can be measured. Specifications Range : 0-200mV (100mV minimum) Accuracy : ±0.1% of reading ± 1 digit (b) Constant Current Power Supply This power supply, specially designed for Hall Probe, provides 100% protection against crystal burn-out due to excessive current. The supply is a highly regulated and practically ripple free dc source. Specifications Current : 0-20mA Resolution : 10mA Accuracy : ±0.2% of the reading ±1 digit Load regulated : 0.03% for 0 to full load Line regulation : 0.05% for 10% variatio The Details of other subunits can be had from their respective datasheets 

Additional Information:

Item Code: AM-14759

Send Bulk Enquiry

X