| 摘要 |
A digital meter is designed for measuring alternating current and is formed of a metal rotary disk, a light-emitting element, a light-sensing element, a signal wire, and a signal conversion display. The metal rotary disk is provided with a through hole located at an appropriate position thereof The light-emitting element and the light-sensing element are corresponding in location to each other such that they are located on a rotational path of the through hole. As the metal rotary disk completes one revolution, the light-sensing element receives once a light signal is transmitted via the signal wire into the signal conversion display by which the signal is converted into a numerical value of power consumtion. The numerical value of power consumption by a power user is thus attained by a terminal located in the power company without the use of a meter-person.
|
