FESP 5410-1 – DC–10 MHz Square Induction Coil for Magnetic Field Immunity

The FESP 5410-1 is a 1 m square induction coil designed to generate well-defined magnetic fields for EMC immunity testing in accordance with IEC 61000-4-8, IEC 61000-4-9, and IEC 61000-4-10. With a usable frequency range from DC to 10 MHz and a robust mechanical design, it is ideal for power-frequency, pulsed, and oscillatory magnetic field immunity tests on industrial, automotive, and infrastructure equipment. 

When driven by a suitable high-current source such as the MFPO 9760 current transformer, the FESP 5410-1 can achieve short-time magnetic fields above 1000 A/m and continuous fields up to 360 A/m at the coil center. 

Key Features

• Purpose-built for IEC magnetic immunity standards

  • Supports tests according to IEC 61000-4-8, IEC 61000-4-9, and IEC 61000-4-10 for industrial frequency, pulsed, and damped oscillatory magnetic fields.

• Wide frequency range: DC–10 MHz

  • Single-turn, low-inductance coil (2.9 µH) enables both power-frequency and fast transient waveforms for time-domain testing. 

• High field strength capability

  • Magnetic field factor of 0.9 A/m per ampere of coil current at the coil center.

  • Rated for 400 A continuous, 600 A for 10 min, providing up to 360 A/m continuous field strength. 

• Helmholtz pair operation

  • Two FESP 5410-1 coils can be configured as a Helmholtz pair to increase field strength and significantly improve field uniformity over a larger test volume. 

• Robust mechanical construction

  • Aluminum conductor with 10 × 25 mm cross-section for low resistance and mechanical stability.

  • Integrated 22 × 195 mm mounting tube for use on standard masts and fixtures. 

• Lab-friendly connectivity

  • Equipped with M16 male screw terminals for secure, low-resistance, high-current connections to the drive source. 

Typical Applications

• Magnetic field immunity testing per IEC 61000-4-8 (power-frequency)

• Pulsed magnetic field tests per IEC 61000-4-9

• Damped oscillatory magnetic field tests per IEC 61000-4-10

• Evaluation of:

  • Power converters, UPS systems, drives, and switchgear

  • Industrial control systems and protection relays

  • Infrastructure, rail, and substation electronics are exposed to strong mains-related magnetic fields 

Operation with MFPO 9760

Paired with the MFPO 9760 current transformer and pulse generator, the FESP 5410-1 forms a complete magnetic field immunity system:

• MFPO 9760 provides controlled high current at 50/60 Hz with adjustable ON-times and pulsed operation.

• The FESP 5410-1 converts this current into a well-characterized magnetic field at the EUT location, achieving >1000 A/m (short-time) and 360 A/m continuous at the coil center. 

• AM 5410-1 Mounting kit for the FESP 5410-1/ MFPO 9760, composed of:
• - aluminum base with wheels for the MFPO 9760;
• - glass-fiber mast;
• - adapter to mount the FESP 5410-1 on the fiberglass mast.

This combination is ideal for accredited EMC labs and in-house qualification facilities requiring repeatable, standards-based magnetic field tests.

Technical Specifications – FESP 5410-1 Square Induction Coil