Measurements, Testing, and Calibration Advanced Measurement Topics Informational

How do I perform conducted and radiated immunity testing according to IEC 61000 standards?

Conducted and radiated immunity testing according to IEC 61000 standards evaluates a product's ability to operate correctly when exposed to electromagnetic disturbances at levels specified by the product's relevant EMC standard. Conducted immunity testing (IEC 61000-4-6, 150 kHz to 80 MHz) involves: injecting a modulated RF signal (amplitude modulated at 1 kHz with 80% modulation depth) onto the equipment's power lines, signal cables, and I/O ports using a coupling/decoupling network (CDN) or electromagnetic clamp, sweeping the frequency from 150 kHz to 80 MHz in steps of approximately 1% while maintaining the specified test level (typically 1-10 Vrms for residential/commercial environments, 10-30 Vrms for industrial), monitoring the equipment under test (EUT) for any malfunction or performance degradation during the sweep, and recording any deviations from the performance criteria (Criterion A: no degradation during test, Criterion B: temporary degradation that self-recovers, Criterion C: temporary loss of function that requires user intervention). Radiated immunity testing (IEC 61000-4-3, 80 MHz to 6 GHz) involves: illuminating the EUT with a uniform electromagnetic field generated by an antenna in an anechoic chamber or semi-anechoic chamber, maintaining the specified field strength (typically 1-10 V/m for residential/commercial, 10-30 V/m for industrial) across the entire test frequency range, modulating the test signal (1 kHz AM at 80% depth for most standards), sweeping from 80 MHz to 1 GHz (or 6 GHz for some product standards) while monitoring the EUT for any performance deviation.
Category: Measurements, Testing, and Calibration
Updated: April 2026
Product Tie-In: VNAs, Probes, Chambers, Signal Generators

IEC 61000 Immunity Testing

Immunity testing demonstrates that a product can function in its intended electromagnetic environment without malfunction. Unlike emissions testing (which protects the environment from the product), immunity testing protects the product from the environment.

ParameterSOLT CalTRL CaleCal
AccuracyGoodExcellentGood-very good
Standards Needed4 (S,O,L,T)3 (T,R,L)1 (module)
BandwidthBroadbandBand-limitedBroadband
Setup Time5-10 min10-20 min1-2 min
Best ForCoaxial, generalOn-wafer, waveguideProduction, speed
  • Performance verification: confirm specifications against the application requirements before finalizing the design
  • Environmental factors: temperature range, humidity, and vibration affect long-term reliability and parameter drift
  • Cost vs. performance: evaluate whether the application demands premium components or standard commercial grades
  • Interface compatibility: verify impedance, connector type, and mechanical form factor match the system architecture
  • Margin allocation: include sufficient design margin to account for manufacturing tolerances and aging effects
Common Questions

Frequently Asked Questions

What test levels apply to my product?

The test level depends on the product standard: residential/commercial equipment (IEC 61000-6-1): 3 V/m radiated, 3 Vrms conducted. Industrial equipment (IEC 61000-6-2): 10 V/m radiated, 10 Vrms conducted. Automotive (ISO 11452): 30-200 V/m. Medical devices (IEC 60601-1-2): 3-10 V/m depending on the intended environment. Military (MIL-STD-461): 10-200 V/m depending on the platform.

What happens if the product fails immunity testing?

Common failures: display corruption, data errors, software crashes, loss of communication, or false outputs. Mitigation strategies: improve filtering on the affected cable (add ferrite cores or pi-filters), improve shielding (close apertures, improve gaskets), add EMI suppression components to sensitive circuits (decoupling capacitors, TVS diodes), and improve PCB layout (better ground plane, shorter trace lengths, improved routing). Re-test after each modification to verify the fix.

How long does immunity testing take?

Conducted immunity (150 kHz - 80 MHz): approximately 30-60 minutes per cable, including setup. Typical EUT with 5 cables: approximately 4-6 hours. Radiated immunity (80 MHz - 6 GHz): approximately 2-4 hours for a full sweep with 4 EUT orientations (front, back, left, right) x 2 polarizations (horizontal, vertical). Plus setup time: approximately 1-2 hours. Total for both conducted and radiated: approximately 1-2 days.

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