Magnetic Field Immunity Testing

Magnetic field immunity testing evaluates how electronic equipment responds to controlled magnetic disturbances while it operates. Stancer Testing-Lab provides power-frequency and pulsed magnetic-field evaluations for products used near power equipment, high-current conductors and other relevant sources.

We agree the required field, exposure conditions, equipment orientation and functions to monitor before testing. Results form part of a product-specific EMC testing program, with the applicable method, edition and accredited coverage reviewed against our ISO/IEC 17025 scope.

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What Magnetic Field Testing Helps You Evaluate

Sensitive Functions

Observe sensors, measurement circuits, controls and other agreed functions during magnetic exposure.

Orientation and Configuration

Assess the representative assembly and required orientations, including its cables, accessories and operating modes.

Performance and Recovery

Document errors, temporary degradation, resets and recovery against the applicable product criteria.

Magnetic Field Methods and Laboratory Capabilities

50/60 Hz Fields

Power-frequency immunity under IEC 61000-4-8 uses defined exposure levels and durations. It is distinct from RF electric-field testing.

Up to 1,000 A/m

Published sinusoidal setup capability. Available level, frequency, coil, test volume and exposure duration are confirmed for each project.

Coil and Orientation

Sample dimensions and required orientations guide the coil selection and placement. Monitoring remains active during exposure.

Select the Required Magnetic Disturbance

Power-frequency, pulsed and damped oscillatory magnetic fields are distinct test methods. The applicable product standard or customer specification determines which evaluation is required and how performance is assessed.

Magnetic field immunity methods
Method	Disturbance	Planning considerations
IEC/EN 61000-4-8	Power-frequency magnetic field	50 Hz and 60 Hz testing, with the required field strength, exposure duration and equipment orientations.
IEC/EN 61000-4-9	Pulsed magnetic field	Specified impulse magnetic exposure, with the required waveform, level, polarity and test arrangement.
IEC/EN 61000-4-10	Damped oscillatory magnetic field	A separate method for oscillatory magnetic disturbances. Confirm equipment availability, required parameters and accredited coverage before scheduling.

Stancer uses controlled magnetic-field generators and suitable coils, including Helmholtz arrangements where appropriate to the test. The achievable field and test volume depend on the coil, waveform, frequency, exposure duration and sample size. Our published sinusoidal-field equipment capability reaches up to 1,000 A/m, subject to confirmation of the selected configuration and duration. Additional frequencies, including 400 Hz, require a separately agreed specification; they should not be described as IEC 61000-4-8 power-frequency testing.

Our Test Sequence

Define. Agree the method, exposure level, sample dimensions, operating modes and acceptance criteria.
Configure. Select the coil, generator, sample placement and functional monitoring.
Verify. Establish the field conditions for the required test arrangement.
Expose. Apply the specified field and orientations while monitoring the equipment.
Report. Record the configuration, applied conditions, observed response and assessment.

Magnetic Our Process — Coil configuration, equipment orientations and functional monitoring are agreed before testing.

Prepare Your Product for Testing

Provide the product function, dimensions, supply requirements, applicable standard and required magnetic-field levels. Identify sensitive measurements, sensors and controls, together with the operating modes and performance indicators to monitor. Bring representative cables, loads and accessories. Define any permitted temporary changes and required recovery. Use our client information sheet to prepare the details, including essential-performance monitoring for an applicable medical device EMC program.

Related Tests and Scope

Magnetic-field immunity uses field strength expressed in A/m. Radiated RF immunity testing commonly specifies electric-field strength in V/m and evaluates a different disturbance. Passing one evaluation does not replace the other. The required field, duration and acceptance criteria come from the relevant product requirements. We confirm the supported edition, clauses and setup against the accreditation scope; not every listed equipment capability is an accredited condition under every standard.

Magnetic Field Immunity FAQs

What is magnetic field immunity testing?

It evaluates the response of operating equipment to a specified magnetic disturbance. The test records the behaviour of agreed functions against product-specific performance criteria.

Does IEC 61000-4-8 cover 400 Hz testing?

IEC 61000-4-8 addresses magnetic disturbances at 50 Hz and 60 Hz. A 400 Hz requirement needs an appropriate separate specification and confirmation of the available field and setup.

Can every product be tested at 1,000 A/m?

No single equipment rating defines every achievable test condition. Sample size, coil geometry, waveform, frequency and exposure duration affect the available field. Send the required conditions so we can confirm the setup.

Can you help investigate a magnetic susceptibility problem?

Yes. Pre-compliance investigations can compare orientations, shielding and design changes while monitoring affected functions. Results are specific to the tested configuration and do not guarantee a later compliance pass.

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Magnetic Field Testing