Measurement/acquisition system for electric information

A measurement/acquisition system for electric information comprising:

• at least one sensor unit for detecting analog signals from a plurality of apparatuses representing selected properties with regard to power consumption;
• at least one measurement unit for converting said analog signals to digital signals, and performing first computation so as to obtain intermediate data;
• and
• an acquisition unit for acquiring said intermediate data from said measurement unit(s);
• wherein said sensor unit detects the voltage and current corresponding to power consumption of each of said apparatuses in the form of analog voltage signals vv and vi proportional to said voltage and current,
• and wherein said measurement unit includes
• an A/D conversion unit for converting said analog voltage signals vv and vi into output signals VV and VI, respectively, in the form of digital signals, at a predetermined first cycle,
• a first computing unit for computing the squares of said output signals VV and VI, and computing the product of VV and VI, so as to obtain VV2, VI2, and power consumption P, computing the averages thereof at a predetermined second cycle, and extracting the square roots of the averages of VV2 and VI2,
• a first accumulation unit for accumulating said values, and storing intermediate data formed of the accumulated values thus obtained and the number of accumulations N,
• a transmission/reception unit for transmitting said intermediate data to said acquisition unit according to a transmission request signal from said acquisition unit, and
• resetting means for removing said intermediate data stored in said first accumulation unit after transmission of said intermediate data,
• and wherein said acquisition unit includes
• a transmission/reception control unit for transmitting an intermediate-data transmission request signal to each of said plurality of measurement units at a predetermined third cycle, and receiving said intermediate data,
• a second computing unit for dividing each of said accumulated values by said number of accumulations N based upon the said intermediate data so as to calculate and correct the averages (average voltage, average current, and average power consumption) in a period of time between the previous and current transmission request signals, and
• a second accumulation unit for storing the computation results.