単発波形に対するディジタル計測の誤差評価

抄録

In high voltage measurement, digitizers are usually used for their convenience of automatic data acquisition. However, the dynamic characteristics of digitizers are not known in detail, especially in the measurement of single-shot waveforms.
In this paper, a method for evaluating the dynamic characteristics of digitizers for the single-shot waveform is presented and the accuracy is examined by a numerical simulation. This method is also applied to the digitized data in an experiment and it is pointed out that the dynamic characteristics of digitizers should be evaluated not only for the steepness of the input waveform but also for the individual digital code which digitizers allocates to a small range of the analog input voltage.
From these results, the method for estimating the dynamic characteristics of digitizers in the measurement of single-shot waveforms is improved. The dynamic characteristics evaluated by this method show very good agreement with those evaluated for the lightning impulse waveform.