CURRENT MEASUREMENT DEVICE, CURRENT MEASUREMENT METHOD AND CURRENT MEASUREMENT PROGRAM

摘要

In order to improve the accuracy of measurement of an alternating current, a current measurement device is provided with a rectification unit (12) for rectifying an alternating-current signal, an A/D conversion unit (13) for converting an analog signal corresponding to a signal obtained by the rectification by the rectification unit (12) into a digital signal, an addition unit (14) for adding digital signals corresponding to alternating-current signals during a sampling period among the digital signals obtained by the conversion by the A/D conversion unit (13), and a current value conversion unit (15) for converting an additional value obtained by the addition by the addition unit (14) into a current value using a current value conversion function. The sampling period is a common multiple of the periods of alternating-current signals of 50 Hz and 60 Hz, the current values of which are to be measured. The current value conversion function is a function for associating the additional values and the current values in a one-to-one correspondence, and a coefficient and a constant that are included in the current value conversion function are a coefficient and a constant that are common to the alternating-current signals of 50 Hz and 60 Hz.