The impulse voltage standard calibrator is the key equipment for achieving impulse voltage quantity traceability. In order to establish the standard impulse voltage measuring system and realize the impulse voltage magnitude transferring in the China

the calibrator must be developed. The theoretical analysis

uncertainty evaluation and characteristic analysis of a low impendence standard calibrator are described. The calibrator is a small Max generator

the peak value Up

front time T1

and time to half value T2 of the generated impulse are calculated from the calibrated values of the components of the impulse forming network. The operating voltage range of the calibrator is from 10 V to1 000 V and time parameters are: 1.543 9 μs of T1

59.500 5 μs of T2. The expand uncertainty of Up

T1

T2 is 5×10-4

4×10-3

2×10-3 with a coverage factor of 2. The deviation for the peak value of measured value and set value is from-0.8‰ to 0.6‰

for front time T1 from-1.5‰ to 2.5‰ and for time to half value T2 from-1.7‰ to 0.5‰. Repeated 20 times

the max standard deviation is 2.7×10-4. The long-term stability is less than 0.3‰ within a year. Calibrating standard resistance divider that the high voltage arm resistor is 3.45 k?

the impulse scale factor agree with test results of frequency response. The experimental results show that the low impedance calibrator is not only can be used as the primary reference of impulse voltages for calibration of digital record but also can used to calibrating the impulse voltage divider. Compared with Kal1000 produced Strauss Company

the deviation for the peak value of Kal1000 is from-2‰ to 3‰. The experimental results show the high accuracy of standard calibrator.