Industrial Double Bridge Manufacturer,Supplier and Exporter in India
Product Code : EL-SI-8046
Jlab Export is a leading Industrial Double Bridge Manufacturer,and suppliers in India
Industrial Double Bridge (code EL-SI-8046) is a double bridge for measuring very low resistances, from 2 micro-ohm to 11 ohm, in electrical testing rooms, cable works and engineering college labs. Its standard is a rotary dial of ten 0.01 ohm manganin coils plus a circular slide wire, and it carries up to 10 A for short readings. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Instrument type | Double bridge for low-resistance measurement |
| Range of measurement | 2 micro-ohm to 11 ohm |
| Standard resistance | 10 coils of 0.01 ohm each on a rotary dial, plus a circular slide wire of 0.01 ohm total resistance with 500 sub-divisions |
| Slide-wire division | 0.00002 ohm per division on the normal range |
| Multiplying ratios | 5 ratios (x100, x10, x1, x0.1 and x0.01) from a single rotary switch |
| Maximum current | 10 A intermittently; 5 A continuously |
| Accuracy | ±0.5% (listed with the note “current 5 A up to 10 A”) |
| Resistance coils | Manganin |
| Panel and case | Bakelite panel enclosed in a teak wood box |
| Panel fittings | Separate current and potential terminals; battery and galvanometer terminals; push buttons for battery and galvanometer |
| Quality check | Each bridge is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SI-8046 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Industrial Double Bridge Used For?
A double bridge, often called a Kelvin double bridge, measures resistances too small for an ordinary Wheatstone bridge, where the resistance of the connecting leads and contacts would swamp the reading. The unknown is connected through separate current and potential terminals: the test current flows through one pair while the bridge senses the voltage through the other, and a second set of ratio arms reduces the effect of the link between the standard and the unknown. JLab lists this bridge as very suitable for wire and cable manufacturers, and it is used to find the resistance of transformer windings and the contact resistance of relays. In engineering colleges, polytechnics and ITI electrical workshops it serves the classic experiment on measuring low resistance with Kelvin’s double bridge.
What to Specify When Ordering
- Quantity — the minimum order is 10 bridges, supplied individually.
- Galvanometer and DC supply — the panel has terminals and push buttons for both; a galvanometer and a DC current source are separate items and can be quoted on the same enquiry.
- Test leads — ask whether current and potential leads can be supplied for your specimens, and state the cable or winding sizes you will test.
- Accuracy requirement — if a tender states an accuracy at a particular test current, include it so JLab can confirm it against the listed ±0.5%.
Frequently Asked Questions
What resistance range does this double bridge cover?
It measures from 2 micro-ohm to 11 ohm. The five multiplying ratios, from x0.01 to x100, are selected with one rotary switch and scale the reading of the coil dial and slide wire.
Why use a double bridge rather than a Wheatstone bridge for low resistance?
Its separate current and potential terminals and its second set of ratio arms reduce the effect of lead and contact resistance, which at micro-ohm levels can be large compared with the resistance being measured. For medium resistances a Wheatstone bridge, such as the portable model linked below, is usually the simpler choice.
How much current can the bridge carry?
Up to 10 A intermittently and 5 A continuously. The listed accuracy is ±0.5%, given with the note “current 5 A up to 10 A”.
What is the smallest step on the slide wire?
The circular slide wire has a total resistance of 0.01 ohm divided into 500 parts, so each division equals 0.00002 ohm on the normal range. It continues the ten-step coil dial between coil values.
What connects to the bridge’s terminals?
The panel has separate current and potential terminals for the specimen, plus battery and galvanometer terminals with their own push buttons. A DC supply and a galvanometer connect to these; both can be quoted on the same enquiry.
What should an export enquiry include?
Give the quantity, the destination country and port or city, the delivery terms you prefer (for example FOB or CIF), any packing or labelling needs, and the tender reference if one applies.
Who manufactures this bridge?
Jain Laboratory Instruments Pvt Ltd, trading as JLab, builds it at its works in Ambala, Haryana, India, and quotes for it directly.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, a scientific instruments manufacturer in India that was incorporated in 2017 and works from Hargolal Road, Ambala, Haryana. The double bridge is assembled at JLab’s own works rather than bought from a trader, so engineering colleges, test laboratories, dealers and importers deal with the maker directly; each unit is visually inspected before dispatch, and repeat orders and replacement parts are handled by the manufacturer. JLab exports worldwide and ships to buyers in every region — Ivory Coast in West Africa, Libya in North Africa, Poland in Eastern Europe, Bolivia in South America and Jordan in the Middle East are some examples. Institutions buying through tenders can find details on the JLab lab tenders page.
Related Electrical Measurement Instruments
- Spot Reflecting Galvanometer — a DC null detector for bridges and potentiometers that runs on the mains or a 6 V battery.
- Adjustable D.C. Current Source — a mains-operated source of continuously adjustable DC current up to 10 A.
- Portable Wheatstone Bridge — for medium resistances, with a built-in galvanometer and dry battery.
- Self Inductance Bridge — a bridge for inductance work that can also be used as a Wheatstone bridge.
- External Shunts with 50 mV or 75 mV Drop — low-resistance shunts for measuring heavy DC currents with a millivoltmeter.
Browse the full Scientific Instrument range or the wider Indian Instruments section.
Request a Quote
JLab quotes for this bridge directly as its manufacturer. Use the Add To Cart enquiry button on this page, or send the quantity (minimum 10 units), any galvanometer, current source or leads you want with it, and your delivery location through the contact page.
Last updated: 8 October 2026
