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Patent Searching and Data


Title:
ELECTRONIC WATTHOUR METER
Document Type and Number:
Japanese Patent JPH0727796
Kind Code:
A
Abstract:

PURPOSE: To provide an electronic watthour meter which can be adjusted automatically.

CONSTITUTION: The watthour meter is constituted of a power-to-voltage conversion means 3 which converts electric power to be measured into a voltage signal, a voltage-to-frequency conversion means 4 which converts the voltage signal from the power-to-conversion means 3 into a frequency signal, a processing means and a smooting means 9, 8 which detect the frequency signal form the voltage-to-frequency conversion means 4 in no-load electric power and which convert it into a voltage signal, and a correction means 7 which is installed between the power-to-voltage conversion means 3 and the voltage-to- frequency conversion means 4 and which corrects the voltage signal of the power-to-voltage conversion means 3 on the basis of the voltage signal from the smoothing means 8.


Inventors:
SAKOYAMA MITSUHIRO
SATO YUMI
Application Number:
JP1993000175259
Publication Date:
January 31, 1995
Filing Date:
July 15, 1993
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
G01R21/00; G01R21/133; G01R22/00; (IPC1-7): G01R22/00; G01R21/00; G01R21/133
Attorney, Agent or Firm:
Hidekazu Miyoshi (3 outside)