| 摘要 |
PROBLEM TO BE SOLVED: To omit the switching of a plurality of analog signals, and to improve the frequency characteristics of measurement data.SOLUTION: A power measurement device includes a plurality of conversion units for receiving a plurality of analog signals, and converting them into a plurality of measurement data, and a transmission unit for transmitting the plurality of measurement data to the outside. The plurality conversion units includes, respectively, a lowpass filter for passing the low band of analog input signals, a sample and hold section for sampling the output value of the lowpass filter every predetermined first period, and outputting the sampled values while holding over the period of next sample, an A/D conversion section performing A/D conversion of the output from the sample and hold section every second period shorter than the first period, before being outputted, and a calculation section for calculating the representative value of a plurality of values, subjected to A/D conversion in the period, as the measurement data every first period. |
