Wheatstone Bridge Manufacturer,Supplier and Exporter in India
Product Code : EL-PL-13424
Jlab Export is a leading Wheatstone Bridge Manufacturer,and suppliers in India
Wheatstone Bridge (code EL-PL-13424) is a bridge board for finding an unknown resistance by balancing it against known ones, fitted with nine heavy lock-type brass terminals and removable brass binding pieces across the end gaps. A pencil jockey and a connecting lead come with it. JLab makes model JL348 in Ambala, India, for school and college electricity practicals.
Specifications
| Parameter | Detail |
|---|---|
| Model | JL348 |
| Use | Measuring an unknown resistance |
| Terminals | Nine heavy brass terminals, lock type |
| End gaps | Closed by removable brass binding pieces held in position by the terminals |
| Supplied with | Pencil jockey and connecting lead |
| Quality check | Each bridge board is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Product code | EL-PL-13424 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How the Bridge Balances
The circuit has four resistances in a loop: two known ratio arms, a variable resistance and the unknown. A cell is connected across one pair of opposite junctions and a galvanometer across the other. When the balance point is found with the pencil jockey, the galvanometer shows no deflection: no current flows through it, and the ratio of the two known arms equals the ratio of the variable arm to the unknown, P/Q = R/S. The unknown is then S = R × Q/P.
Getting a Steady Balance Point
The nine heavy brass terminals are there to keep contact resistance to a minimum, because any stray resistance in an arm shifts the balance point and spoils the result. Clean and tighten each terminal before a reading. The end gaps are closed by removable brass binding pieces held in position by the terminals. Tap the jockey lightly rather than dragging it, and close the cell key only while a reading is taken, so the resistances do not warm up and drift.
Related Bridge Apparatus
- Wheatstone Bridge Apparatus — slide-wire version with the wire along a wooden metre scale.
- Resistance Box — plug-type box with constantan coils for the known arm.
- Galvanometer — centre-zero galvanometer for sensing the very small currents near balance.
- Jockey — spare pencil jockey with insulated handle and plated brass contact.
Keys, rheostats and meters for the same circuits are in Physics Lab.
Request a Quote
Enquire with Add To Cart, or use the contact page to give the number of bridge boards and the delivery address for your laboratory.
Last updated: 26 October 2026
