Capacitive Clamp Usage in Damped Oscillatory Wave Immunity Tests for IEC and ANSI Standards

This document illustrates laboratory experiences of live usage of capacitive clamp during test sessions of damped oscillatory wave according to both IEC and ANSI Standards and their difference regarding calibration. Despite the fact that the waveform for slow and fast waves are different, matching different physical phenomena, a unique approach can be used for both Standards leading to a good calibration for capacitive clamp. The performance of a new generation damped oscillatory generator with slow and fast waves capabilities was measured by an accredited testing facility and the capacitive clamp calibration was repeated by the accredited calibration centre for both types of damped oscillatory wave and simulated by SPICE. The same IEC calibration procedure for fast damped oscillatory wave is finally recommended also for ANSI slow damped oscillatory wave at 1 MHz.