Precision Resistance Coil Unit

Product Code : SCL-EAE-11257

The Precision Resistance Coil Unit is a laboratory resistance reference used for bridge measurements, resistance comparison, circuit verification and electrical instrument testing. It is intended for college, university and technical laboratories that require a known resistance value for controlled low-voltage measurement activities.

Product Description

The unit contains a resistance-wire element mounted on an electrically insulating support and connected to accessible terminals. Precision resistance elements are designed to provide a defined nominal value with controlled deviation, but the actual tolerance and stability depend on the winding material, construction and calibration status.

A suitable unit can serve as a working reference in Wheatstone bridge, meter bridge and resistance-comparison experiments. Precision resistance standards are generally evaluated for resistance accuracy, long-term stability, temperature coefficient and power coefficient. These values must be verified for the supplied model before it is described as a calibrated or traceable standard.

Key Features

• Defined nominal resistance: Provides a reference value when verified by product documentation.
• Precision-wound element: Supports controlled resistance comparison and laboratory measurement.
• Stable terminal connection: Allows integration with bridges, meters and low-voltage test circuits.
• Reference applications: Suitable for checking measured resistance against a known value.
• Reusable laboratory format: Designed for repeated tests within confirmed current and power limits.
• Educational metrology value: Introduces tolerance, uncertainty, temperature effects and calibration.
• Passive operation: Requires no internal power source.

Technical Specifications

What's Included in the Kit

• 1 × precision resistance coil unit
• Calibration certificate
• Protective case 
• Technical data sheet 

A bridge, galvanometer, multimeter, power supply and connecting leads are not included unless specifically stated.

Applications / Uses

• Comparing an unknown resistance with a known reference value.
• Balancing a Wheatstone bridge or compatible resistance bridge.
• Supporting measurements with a meter bridge or Wheatstone bridge.
• Checking laboratory ohmmeters and digital multimeters within suitable limits.
• Verifying circuit measurements against a fixed resistance reference.
• Studying tolerance, temperature coefficient and resistance stability.
• Comparing fixed values with a plug-type resistance box.
• Supporting current–voltage investigations with an Ohm’s law apparatus.

How to Use the Precision Resistance Coil Unit

1. Confirm the nominal value, tolerance, terminal arrangement and maximum current.
2. Allow the unit to stabilize at the laboratory temperature when precision comparison is required.
3. Inspect the terminals and housing for contamination or physical damage.
4. Keep the test circuit switched off while making connections.
5. Use the specified two-terminal or four-terminal connection method.
6. Apply the lowest practical measurement current to limit self-heating.
7. Record the ambient or unit temperature when required by the test method.
8. Compare the measured value with the certified or stated nominal resistance.
9. Disconnect the circuit before changing bridge or meter connections.

Measurement note: Self-heating can alter the resistance value. Do not exceed the confirmed measurement current or power rating, and do not describe the unit as a calibration standard without valid traceability documentation.

Care & Maintenance

• Store the unit in a dry, temperature-stable environment.
• Keep terminals clean and avoid touching precision contact surfaces unnecessarily.
• Protect the unit from impact, moisture, excessive current and prolonged heating.
• Recalibrate it at an interval appropriate to the laboratory’s quality procedure.

Why Choose Lab Equipments Ambala

Lab Equipments Ambala manufactures and exports scientific and educational laboratory equipment from Ambala, India. Its electrical range includes resistance boxes, meter bridges, Ohm’s law apparatus and related circuit-measurement equipment. The company supports institutional and international laboratory procurement. Buyers should confirm the resistance value, accuracy class, terminal system and calibration requirements before ordering.

Frequently Asked Questions

What is a Precision Resistance Coil Unit used for?

It is used as a known resistance reference for bridge measurements, resistance comparison, circuit verification and suitable instrument checks.

What makes a resistance coil a precision unit?

A precision unit should have documented resistance tolerance, stability and temperature characteristics. The word precision alone does not prove calibration accuracy.

Is the resistance coil wound non-inductively?

Some precision resistance standards use non-inductive winding to reduce inductive effects, but this construction must be confirmed for the supplied model.

Does it include a calibration certificate?

A certificate is not assumed. Confirm whether calibration is included, optional or unavailable and whether it is traceable to a recognized standard.

Why should a low measurement current be used?

Current produces self-heating, which can change resistance and reduce measurement reliability. Always remain within the documented current and power limits.

Can it be connected directly to mains electricity?

No. The unit is intended for controlled measurement circuits and must not be connected directly to mains electricity.

Explore the complete electrical and electronics laboratory equipment range from Lab Equipments Ambala for related resistance boxes, bridge apparatus and measurement instruments.