Wheatstone Bridge Apparatus Manufacturer,Supplier and Exporter in India
Product Code : EL-PL-12408
Jlab Export is a leading Wheatstone Bridge Apparatus Manufacturer,and suppliers in India
Wheatstone Bridge Apparatus (code EL-PL-12408) is a slide-wire bridge for comparing an unknown resistance with a known one: a constantan wire runs along a wooden metre scale between brass end strips, with nine heavy lock-type brass terminals and removable copper binding pieces across the end gaps. It is a JLab product, made in Ambala, India, and comes with a pencil jockey.
Specifications
| Parameter | Detail |
|---|---|
| Model | JL339/068 |
| Bridge wire | Constantan wire along the top of a wooden metre scale |
| Wire ends | Clamped to brass end strips |
| Terminals | Nine heavy lock-type brass terminals |
| End gaps | Closed by removable copper binding pieces held by the terminals |
| Base | Laminate-topped |
| Supplied with | Pencil jockey |
| Quality check | Each bridge 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-12408 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
Finding the Null Point
Put a known resistance in one gap and the unknown resistor in the other. Connect a cell across the ends of the wire and a centre-zero galvanometer between the junction of the two resistors and the jockey. Press the jockey lightly at points along the wire, lifting it between touches, until the galvanometer shows no deflection; dragging it under pressure scrapes the wire and changes its cross-section.
At balance the ratio of the two resistances equals the ratio of the wire lengths on either side of the jockey. With the unknown X in the left gap and the balance length l in centimetres from the left end, X = R × l / (100 − l).
Keeping Errors Small
The heavy brass terminals and copper binding pieces keep the resistance of the joints small compared with the resistors being compared. Choose the known value so the balance falls near the middle of the wire, where a misread length matters least, then swap the two resistors, balance again and average the results to cancel any end error.
Items Used with the Bridge
- Moving Coil Galvanometer — centre-zero meter for detecting the null point.
- Resistance Box — plug-type box for the known resistance in the second gap.
- Jockey — spare pencil jockey with an insulated handle and 4 mm socket.
More current electricity apparatus is part of the Physics Lab section.
Request a Quote
Ask for a quotation on the contact page or use Add To Cart; let us know the number of bridges, model JL339/068 and the delivery destination.
Last updated: 26 October 2026
