Impulse Response Parameter Errors Caused by Imprecisely Recorded Unit Step Response

Abstract

This paper clarified the effect of recording error of the unit step response by a transient recorder over the simulated impulse response using the numerical convolution method for evaluating the performance of the impulse measuring system. The unit step response, imprecisely recorded but falls within a margin defined by IEC61083-1, is approximated by an analytical function and is used to analyse the response parameters for the lightning impulse measuring system. Simulations show that errors for the front time can become intolerable for the reference measuring system while those for peak value stay insignificant. Simulations were carried out with the standard lightning impulse (1.2/50μsec) as well as its variations still accepted by IEC 60060-1.