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Educational Instruments
Leading Manufacturer of hall effect in metals, four probe method and v- tech educational models from Coimbatore.
Hall Effect in Metals
Product Price: Rs 29,950 / PieceGet Best Price
Minimum Order Quantity: 1 Piece
Product Brochure
Product Details:
| Usage/Application | Laboratory Experiment |
| Type of Instruments | Semi- Automatic |
| Material | Aluminium |
| Model Number | HEM-01 |
| Display Type | LCD |
| Brand | Nunes Instruments |
The apparatus consists of the following:
a) Hall Probe-Silver (HP-Ag):
- Material: Silver Strip (8 x 6 x 0.05 mm)
- Contacts: Press type for current
- Spring Type for Voltage
- Hall Voltage: ~17 µV/10A/10KG
b) Hall Probe-Tungsten (HP-W):
- Material: Tungsten Strip (8 x 6 x 0.05 mm)
- Contacts: Press type for current
- Spring Type for Voltage
- Hall Voltage: ~15 µV/10A/10KG
c) High Current Power Supply, PS-20A:
- Range: 0-20A continuously variable
- Accuracy: ±0.5%
- Regulation: ±0.5% for ±10% variation of mains
- Display: 3½ digit, 7 Segment LED
d) Digital Microvoltmeter, DMV-001:
- Range: 1mV, 10mV, 100mV, 1V & 10V with 100% over-ranging.
- Resolution: 1μV.
- Accuracy: ±0.2%.
- Stability: Within ±1 digit.
- Input Impedance: >1000MΩ (10MΩ on 10V range).
- Display: 3½ digit, 7 segment LED with auto. Polarity and decimal indication
e) Electromagnet, Model EMU-75T:
- Pole Pieces: 75mm tappered to 25mm
- Mag. Field: 17KG ±5% at 10mm airgap
- Energising Coils: Two of approx. 13W each
- Power: 0-90Vdc, 3A, for coils in series, 0-45Vdc, 6A, for coils in parallel
f) Constant Current Power Supply, Model DPS-175
Instrumentation , is in the field of Instrumentation Sales Service & Repairs with 40 years of experience. We provide service & repairs to your old high precision instruments and equipment. We provide cost effective service & Repair to any brand, any make instruments with service warranty. Why not try once?
Instruments of Any Type, Any Make, Analog/Digital, Any Condition Indian or Imported
- Laboratory Instrument, Test Equipment,
- Scientific, Measuring, Precision Instrument,
- Analytical, Bio Medical, Survey, Electrical,
- Electronic Instruments ,Weather, Metrology.
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Four Probe Method
Product Price: Rs 69,000 / PieceGet Best Price
Minimum Order Quantity: 1 Piece
Product Brochure
Product Details:
| Resolution | 1K |
| Application | Laboratory Experiment |
| Brand | V-Tech |
| Range Oven | 473K |
| Sensor | RTD (A class) |
| Power | 150W |
| Temperature Range | Ambient to 473K |
Resistivity of Semiconductor 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. 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, the arrangement is also specially useful for quick measurement on different samples or sampling different parts of the sample.
Description of the experimental set-up
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. A teflon spacer near the tips is also provided to keep the probes at equal distance. The probe arrangement is mounted in a suitable stand, which also hold the sample plate. To ensure the correct measurement of sample temperature, the RTD is enbeded in the sample plate just below the sample. This stand also serves as the lid of temperature controlled oven. Proper leads are provided for the current and voltage measurement.
2. SAMPLE
Germanium crystal in the form of a chip.
3. OVEN
This is high quality temperature controlled oven suitable for Four Probe Set-up. The oven has been designed for fast heating and cooling rates, which enhances the effectiveness of the controller.
4. FOUR PROBE SET-UP, DFP-03
The set-up consists of three units housed in the same cabinet.
(i) Oven Controller
Platinum RTD (A class) has been used for sensing the temperature. A wheatstone bridge and an instrumentation amplifier are used for signal conditioning. Feedback circuit ensures offset and linearity trimming and a fast accurate control of the oven temperature.
Specifications of the Oven
- Temperature Range : Ambient to 473K
- Resolution : 1K
- Stability : +0.5K
- Measurement Accuracy :+1K(Typical)
- Oven : Specially designed for Four Probe Set-Up
- Sensor : RTD (A class)
- Display : 31/2 digit, 7 segment LED with autopolarity and decimal indication
- Power : 150W
(i) Multirange Digital Voltmeter
In this unit, intersil 3½ digit single chip A/D Converter ICL 7107 has been used. It has accuracy, auto zero to less than 10 μV, zero drift-less than 1 μV/ °C, input bias current of 10 pA and roll over error of less than one count. Since the use of internal reference causes the degradation in performance due to internal heating, an external reference has been used.
Instrumentation , is in the field of Instrumentation Sales Service & Repairs with 40 years of experience. We provide service & repairs to your old high precision instruments and equipment. We provide cost effective service & Repair to any brand, any make instruments with service warranty. Why not try once?
Instruments of Any Type, Any Make, Analog/Digital, Any Condition Indian or Imported
- Laboratory Instrument, Test Equipment,
- Scientific, Measuring, Precision Instrument,
- Analytical, Bio Medical, Survey, Electrical,
- Electronic Instruments ,Weather, Metrology.
Get Best QuoteRequest A Callback
V- TECH Educational Models
Product Price: Rs 3,000 / PieceGet Best Price
Product Brochure
Product Details:
| Brand | V-Tech |
| Type | Educational Model |
| Subject | Educational |
| Usage/Application | Laboratory |
| Color | Mixed |
| Country of Origin | Made in India |
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