ITU-T Recommendations

Some regional standards offer the ring wave generator as an alternative test procedure. Surges in AC mains branch circuits have been found to show a damped ring wave. Supplement 27 to ITU-T K series Recommendations looks at the history of ring waves, the ring wave generator, and its parameters.
For most purposes the 1.2/50-8/20 generator is sufficiently adequate for surge testing without using a 100 kHz ring wave generator.