| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic watt-hour meter by which present electric energy data and past electric energy data can be confirmed at a glance and whose convenience can be enhanced. SOLUTION: The electronic watt-hour meter 1 is provided with a measuring means used to measure a power consumption amount, a clocking means used to clock the hour and the date and time, a storage means used to store various data, a computing means used to perform various computing operations, a liquid crystal panel 2 as a display means used to display the data and an operating button 3 as an operating means used to change over, set or the like the display of the panel 2. A power consumption amount of this month as present data, power consumption amounts of the previous month and the month before last as past data stored in the storage means are simultaneously displayed on the panel 2. When the operating button 3 is operated so as to change over the display, the power consumption amount of this month and a power consumption amount of the same month in the previous year can be simultaneously displayed. |
