IEC 61000-4-3:2020

Overview

IEC 61000-4-3:2020 - "Electromagnetic compatibility (EMC) - Part 4‑3: Testing and measurement techniques - Radiated, radio‑frequency, electromagnetic field immunity test" - defines a standardized method to assess the immunity of electrical and electronic equipment to radiated RF electromagnetic fields. The 2020 (4th) edition is a technical revision that clarifies test procedures, removes the previous upper frequency limit to reflect new RF services, and adds guidance on multi‑signal testing, EUT/cable layout and field/chain characterization.

Key topics and technical requirements

• Scope & objective: Establishes common reference test levels and reproducible procedures for evaluating equipment immunity to RF fields from sources not in close proximity to the EUT.
• Test levels and frequency ranges: Provides criteria for selecting test levels and frequency sweep ranges; this edition removed the upper frequency cap to cover emerging services.
• Test environment & equipment: Specifies requirements for test facilities (open‑area and anechoic chambers), Uniform Field Area (UFA) dimensions and characteristics, antennas, amplifiers and instrumentation.
• Field generation and characterization: Defines methods for level setting (constant field or constant power), field uniformity checks, and E‑field probe calibration (see Annex K).
• Amplifier linearity & harmonic control: Requires checking amplifier linearity and limiting harmonics to ensure the applied field is accurate (Annex D).
• Test setups: Detailed layout guidance for table‑top, floor‑standing, human‑body‑mounted and large/heavy EUTs, including cable routing and accessory arrangement (Annexes G, H).
• Test execution & evaluation: Step sizes, laboratory reference conditions, test sequence, evaluation of EUT performance and standardized test reporting.
• New features in 2020: Description of testing with multiple test signals, extended guidance on cable/EUT layout, and explicit procedures for field and immunity chain characterization.
• Support material: Informative annexes covering intermodulation, measurement uncertainty, probe calibration methods and rationale for modulation choices (e.g., 80% AM).

Applications and who uses this standard

• EMC test laboratories performing radiated immunity testing and certification.
• Product designers and manufacturers ensuring device robustness against ambient RF fields (consumer electronics, industrial control, medical devices, telecommunications equipment).
• Regulatory bodies and product committees using the standard as a reference to set product‑specific immunity requirements (IEC Guide 107 cooperation noted).
• System integrators and compliance engineers designing test plans, lab setups, and evaluating field immunity performance.

Related standards

• IEC 61000‑4‑39 - Immunity testing for RF sources in close proximity to the EUT (complements Part 4‑3 for near‑field scenarios).
• IEC Guide 107 - Guidance on basic EMC publications and product committee responsibilities.

Keywords: IEC 61000‑4‑3, radiated immunity, EMC testing, RF immunity test, uniform field area, anechoic chamber, field probe calibration, amplifier linearity.