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IEC 61000-4-12 Ring Wave Immunity

IEC 61000-4-12 Ring Wave Immunity Testing

Compatible Electronics is NVLAP-accredited for IEC 61000-4-12 (2017) — ring wave immunity testing for equipment connected to AC and DC power networks in medium-voltage installations at our Lake Forest facility.

NVLAP Lab Code 200527-0 IEC 61000-4-12 (2017) Lake Forest, CA

What is IEC 61000-4-12?

IEC 61000-4-12 defines the test methods for evaluating the immunity of electrical and electronic equipment to ring wave disturbances — oscillatory transients that occur on power supply lines as a result of switching operations in medium-voltage systems, capacitor bank switching, and similar events. The ring wave waveform is a 100 kHz damped oscillatory burst, distinct from the unidirectional surge pulse defined in IEC 61000-4-5.

Ring wave immunity is primarily referenced in North American standards and installation environments, including IEEE standards for industrial and utility equipment, and in product standards for equipment used in medium-voltage LV distribution systems. It is closely related to surge immunity (IEC 61000-4-5) testing — both test the response of equipment to transient overvoltages on power lines, and are often tested together at Compatible Electronics.

🔎 Ring Wave vs Surge (IEC 61000-4-5): The ring wave is an oscillatory (bidirectional) 100 kHz transient caused by capacitor switching in medium-voltage systems. The surge (IEC 61000-4-5) is a unidirectional 1.2/50 µs voltage impulse from lightning or major switching events. Both arise on power lines but from different sources and with different waveforms. Many industrial product standards require both. Our Surge Immunity Testing and ring wave tests can be performed in the same visit.

Accredited Standard Version

StandardDescriptionLocation
IEC 61000-4-12 (2017)Electromagnetic compatibility (EMC) — Part 4-12: Testing and measurement techniques — Ring wave immunity test. Current edition.Lake Forest

Test Levels & Waveform

Waveform Parameters

Ring Wave Characteristics

  • Frequency: 100 kHz (± 10%)
  • Rise time: 0.5 µs ± 30%
  • Decay: 50% amplitude in 6 half-cycles
  • Applied to power ports and I/O lines
  • Both differential and common mode
Standard Voltage Levels

Open-Circuit Test Levels

  • Level 1: 0.5 kV — light industrial
  • Level 2: 1 kV — industrial
  • Level 3: 2 kV — industrial / medium voltage
  • Level 4: 4 kV — heavy industrial
  • Level X: special per product standard

Related Services & Resources

EMC-EMI Testing Services Surge Immunity Testing (IEC 61000-4-5) EFT Burst Immunity Testing ESD Immunity Testing Conducted Immunity Testing Radiated Immunity Testing EN 61000-6-2 Industrial Immunity IEC 61000-4-11 Voltage Dips IEC 61326-1 General Requirements CE Marking EMC Testing Pre-Compliance Testing EMC Design Consulting ISO/IEC 17025 Accreditation ILAC MRA Recognition EMC Testing Cost Guide Common EMC Failures Choosing an EMC Lab

Test to IEC 61000-4-12 at Compatible Electronics

NVLAP Lab Code 200527-0 — Ring wave immunity testing at Lake Forest, CA.

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