Since the calculation accuracy of impulse voltage measuring software directly affects the measurement capability of impulse voltage measuring system

the paper introduces the development of calculation method to lightning impulse wave with overshoot and/or oscillation in IEC standard

also briefly describes the basic functions and solutions to key problems in programming progress of self-developed impulse software which is verified the calculation accuracy by using Test Data Generator（TDG） in IEC standard 61083-2-2010. According to the calculated results of self-developed software on 29 typical waveforms of lightning impulse

for 4 parameters: peak value Up

front time T1

time to half-value T2

overshoot magnitude β

the maximum deviation between calculated value and standard value is about-0.07%

1.5%

-0.17%

and 1.0% respectively which are all smaller than the maximum errors provided in standard. In order to summarize the trend of each parameter after the adoption on the new method instead of the old method

the paper still selects 17 typical lightning impulse wave（LI） provided by old IEC 61083-1996 TDG software to calculate

the results show that the overshoot value of new method is lower than the old standard value

which cause the new base curve peak is lower than the old average peak of the curve; for the overshoot frequency f≥500 kHz

the new T1and Upis respectively less than and greater than the old standard value due to the different filtering methods.