Helmholtz Coils - Pair
Model: EM1915-001
Specifications: 400 Turns, 1A Max
Product Overview
This document provides instructions and specifications for the IEC EM1915-001 Helmholtz Coils - Pair. These are air-wound coils of large diameter designed to be connected to a power source and aligned on a common axis for the measurement and study of magnetic fields. They are typically used in conjunction with a magnetic measuring probe, such as the Hall Effect probe, and a constant current power source.
Kit Contents
- 2 pcs: Large coil, with foot, 400 turns. Features 4mm socket head spin-free terminals.
- 1 pce: Rule, metric, 500mm long. Used for setting distances between coils.
Technical Specifications
| Parameter | Value |
|---|---|
| Model Number | EM1915-001 |
| Coil Type | Helmholtz Coils - Pair |
| Number of Turns | 400 per coil |
| Average Coil Diameter | 150mm |
| Coil Inner Diameter (I.D.) | 115mm |
| Coil Outer Diameter (O.D.) | 163mm |
| Maximum Current Rating | 1 Ampere (A) |
| Coil Resistance (Cold) | Approximately 20 ohms |
| Coil Resistance (Hot) | Approximately 25 ohms |
| Weight (Set of 2 coils + scale) | 840g (0.84 kg) |
| Power Source Requirement | Constant current supply, adjustable from 0 to 1 Amp. Maximum voltage required is approximately 26 Volts. |
Usage Notes and Safety Precautions
Helmholtz coils are typically connected in series to ensure the same current passes through both. For optimal performance, use a constant current power supply that maintains current stability even when the coils heat up and their resistance increases.
Caution: The wire is wound on a plastic former rated for high strength and temperature. However, do not overheat the coils. If the current exceeds 1 Amp or if 1 Amp is permitted to flow for prolonged periods, the coils can become very hot. Always turn off the power source or reduce current flow after completing measurements.
Related Products and Spare Parts
Single Helmholtz Coils can be purchased separately under part number PA1915-010. For experiments requiring higher currents, consider the EM1915-020 coil, which features 50 turns of heavier wire.
