IEC 61000-4-12 relates to the immunity requirements and test methods for electrical and electronic equipment, under operational conditions, to non-repetitive damped oscillatory transients (ring waves) occurring in low-voltage power, control and signal lines supplied by public and non-public networks. The object of this basic standard is to establish the immunity requirements and a common reference for evaluating in a laboratory the performance of electrical and electronic equipment intended for residential, commercial and industrial applications, as well as of equipment intended for power stations and substations, as applicable.
The purpose of IEC 61000-4-12 is to define: - test voltage and current waveforms;
- Ranges of test levels
- Test equipment
- Test set-up
- Test procedure
IEC 61000-4-12 specifies tests to simulate two phenomena: The ring wave (non-repetitive) appears at the terminals of equipment as a consequence of switching in power and control lines, as well as a consequence of lightning. The ring wave test applies to equipment connected to AC mains in certain countries (e.g. the mains network in the USA). This test has existed for a long time under the designation ANSI/IEEE C.62.41-1991. The damped oscillatory wave (repetitive) appears at the terminals of equipment as a consequence of switching with restriking of the arc. The damped oscillatory wave test applies to equipment used in high voltage substations (static relays). This test, but with a frequency of 1 MHz only, has existed for a long time under IEC 255-4, Appendix E5: High-frequency disturbance test, also known as ANSI/IEEE C.37.90a-1989, and has been transferred to IEC 60255-22- 1: Electrical disturbance tests for measuring relays and protection equipment – 1 MHz burst disturbance tests. By inclusion in IEC 61000-4-12, the frequency range was extended. Coupling is performed via a coupling/decoupling network with coupling capacitors of 0.5, 3 or 10 µF, depending on the output impedance of the test generator.
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Wave specification
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Ring wave
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Damped oscillatory wave
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Open circuit peak voltage
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250 to 4000 V
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250 to 2500 V
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Oscillation frequency
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100 kHz
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100 kHz and 1 MHz
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Decay rate
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60% of the preceding peak value
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50% of the peak value between the third and sixth periods
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Repetition rate
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1 to 60 per minute
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≥40 Hz for 100 kHz and ≥400 Hz for 1 MHz
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Output impedance
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12 Ω, 30 Ω and 200 Ω
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200 Ω
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Coupling mode
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Common mode and differential mode
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Common mode and differential mode
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Test duration per port and coupling mode
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≥5 positive and ≥5 negative transients
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≥2 s
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Ring wave
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Voltage kv (peak)
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Damped oscillatory
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Wave voltage kV (peak)
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Test Level
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Common Mode
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Differential Mode
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Common Mode
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Differential Mode
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1
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0.5
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0.25
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0.5
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0.25
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2
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1
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0.5
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1
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0.5
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3
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2
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1
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2
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1
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4
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4
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2
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-
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-
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x
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special
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special
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special
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special
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Advanced Test Equipment Rentals provides a variety of equipment for performing ring wave immunity tests and other EMC tests. Check out all of the
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