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IEC 61000 is the International Electrotechnical Commission’s umbrella series for electromagnetic compatibility, best known for the 61000-4-x immunity test methods (ESD, radiated RF, fast transients, surge, dips) and the 61000-6-x generic standards. Where CISPR concentrates on emissions, IEC 61000 supplies most of the world’s immunity testing framework plus power-quality emission limits such as harmonics and flicker.
How is the IEC 61000 series structured?
The series is divided into numbered parts, each with multiple sub-documents (61000-4-2 means Part 4, section 2):
| Part | Title / scope | Examples |
|---|---|---|
| IEC 61000-1 | General - fundamental principles, definitions, terminology | 61000-1-1 (application and interpretation) |
| IEC 61000-2 | Environment - description and classification of electromagnetic environments, compatibility levels | 61000-2-2 (compatibility levels in public LV networks) |
| IEC 61000-3 | Limits - emission limits for equipment connected to public mains | 61000-3-2 (harmonic currents up to 16 A), 61000-3-3 (voltage fluctuations and flicker) |
| IEC 61000-4 | Testing and measurement techniques - basic immunity and measurement standards | 61000-4-2 (ESD), 61000-4-3 (radiated RF), 61000-4-5 (surge) |
| IEC 61000-5 | Installation and mitigation guidelines - earthing, cabling, shielding practice | 61000-5-2 (earthing and cabling) |
| IEC 61000-6 | Generic standards - requirement sets by environment when no product standard applies | 61000-6-1 through 61000-6-4 |
What are the key IEC 61000-4 immunity tests?
Six basic standards form the core immunity suite applied to most commercial products:
- IEC 61000-4-2 - electrostatic discharge (ESD). Simulates a charged person touching the product. Contact discharge severity levels of 2/4/6/8 kV and air discharge levels of 2/4/8/15 kV; a common commercial requirement is 4 kV contact and 8 kV air.
- IEC 61000-4-3 - radiated RF immunity. The product is exposed to a modulated RF field in an anechoic chamber, typically 80 MHz to 1 GHz and above, at field strengths such as 3 V/m (residential) or 10 V/m (industrial).
- IEC 61000-4-4 - electrical fast transient / burst (EFT). Bursts of fast, low-energy transients coupled onto power and signal lines, simulating relay and switch arcing.
- IEC 61000-4-5 - surge. High-energy 1.2/50 us voltage (8/20 us current) impulses simulating lightning-induced and switching surges on power lines.
- IEC 61000-4-6 - conducted RF immunity. RF disturbance (150 kHz to 80 MHz, typically 3 V or 10 V) injected onto cables via coupling networks, covering frequencies where cables act as receiving antennas.
- IEC 61000-4-11 - voltage dips, short interruptions and variations. Verifies behavior when AC mains voltage sags or drops out briefly, with defined performance criteria for ride-through, recovery or safe shutdown.
Each test standard defines the generator, calibration, setup and severity levels, but the pass/fail performance criteria (A: normal performance, B: temporary degradation with self-recovery, C: operator intervention allowed) are assigned by the product or generic standard applying the test.
What are the generic standards IEC 61000-6-1 to 61000-6-4?
When no product-family standard exists, the generics apply based on the installation environment:
- IEC 61000-6-1 - immunity for residential, commercial and light-industrial environments
- IEC 61000-6-2 - immunity for industrial environments (higher severity levels)
- IEC 61000-6-3 - emissions for residential, commercial and light-industrial environments
- IEC 61000-6-4 - emissions for industrial environments
The pattern is symmetric: two environments times two directions (emission/immunity). Industrial immunity levels are higher because factories contain contactors, drives and welders; industrial emission limits are more relaxed for the same reason.
How does IEC 61000 fit with CISPR, FCC and ANSI C63?
IEC 61000 supplies the immunity half of the EU compliance picture, while CISPR supplies the emission half; a multimedia product for Europe typically pairs CISPR 32 emissions with CISPR 35 immunity, where CISPR 35 simply invokes the 61000-4-x basic tests at chosen levels. In the US, FCC Part 15 mandates emissions only, and the voluntary US immunity method is ANSI C63.15 from the ANSI C63 family. The test equipment and chamber types used to run these tests are described in EMC testing basics, and terms such as EFT, surge and flicker are defined in the EMC glossary.