Spot Reflecting
Product Code : SCL-LAO-11132
Quick answer: The Spot Reflecting Galvanometer is a sensitive current detector that shows deflection as the movement of a light spot rather than a pointer, so very small currents and exact balance points can be seen. It is used as a null detector in Wheatstone bridge and potentiometer experiments. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Parameter | Detail |
|---|---|
| Instrument | Spot reflecting galvanometer (single laboratory instrument) |
| Function | Detection of small electrical currents and null conditions |
| Indication | Optical light-spot deflection |
| Typical experiments | Bridge balancing, Wheatstone bridge, potentiometer |
Sensitivity, coil resistance and supplied accessories are not listed on this page; email [email protected] with the house code SCL-LAO-11132 for these details.
How it is used
In a reflecting galvanometer, the current passes through a coil suspended in a magnetic field, and the coil carries a small mirror. A beam of light falls on the mirror and is reflected as a spot on a scale. When the coil turns through an angle theta, the reflected beam turns through 2 theta, and the long light path acts as a weightless pointer, so tiny deflections become easy to see.
This makes the instrument well suited to null methods. In a Wheatstone bridge, the unknown resistance is found when no current flows through the galvanometer, P/Q = R/S; in a potentiometer, the balance point is where the light spot stays at zero as the jockey touches the wire.
- Place the instrument on a stable, vibration-free surface.
- Set the light spot to the zero of the scale.
- Connect the galvanometer in the bridge or potentiometer circuit, with a protective shunt or high resistance in series at first.
- Adjust the circuit until the light spot shows no deflection, then remove the protection for the final balance.
Key features
- Light-spot indication makes small deflections easy to see.
- Suited to identifying null or balance conditions.
- Spot movement shows the direction of imbalance where the configuration permits.
- Supports Wheatstone bridge and potentiometer practicals.
- Suited to school, college, university and vocational electrical laboratories.
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the spot reflecting galvanometer at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
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The full range is in the Light and Optics section of the Physics Lab range.
Frequently asked questions
Why does a spot reflecting galvanometer show small deflections so clearly?
The light beam reflected from the moving mirror turns through twice the coil's angle and travels a long path to the scale, acting as a long, weightless pointer that magnifies small movements.
Which experiments use a spot reflecting galvanometer?
It is used as a null detector in Wheatstone bridge, metre bridge and potentiometer experiments, and for detecting very small currents.
What is the price of the spot reflecting galvanometer?
Prices are not published on the website. Add the spot reflecting galvanometer to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-LAO-11132 and the quantity, to receive a quotation.
Does Lab Exports manufacture the spot reflecting galvanometer?
Yes. Lab Exports manufactures the spot reflecting galvanometer at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-LAO-11132.
Request a quote
Email [email protected] with the house code SCL-LAO-11132 and the quantity, or add the spot reflecting galvanometer to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
