JPS5676053A - Electronic type wattmeter - Google Patents
Electronic type wattmeterInfo
- Publication number
- JPS5676053A JPS5676053A JP15277079A JP15277079A JPS5676053A JP S5676053 A JPS5676053 A JP S5676053A JP 15277079 A JP15277079 A JP 15277079A JP 15277079 A JP15277079 A JP 15277079A JP S5676053 A JPS5676053 A JP S5676053A
- Authority
- JP
- Japan
- Prior art keywords
- electronic switch
- pulse width
- modulation unit
- unit
- alternately
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To surely eliminate an error due to stray charge and to perform a correct measurement of electric power by a method wherein an error compensation circuit is installed between an electronic switch and a pulse width modulation unit and the charge stored when the electronic switch is opened is discharged.
CONSTITUTION: A pulse width moduclation unit 12 applies a sampling pulse to an electronic switch 11 to open and close contacts 11a, 11b alternately, and takes in voltage v1, v2 through an error compensation circuit 13. At this time, a stray charge stored between the switch 11 and the modulation unit 12 is discharged through a resistor 13a or 13b. A pulse width signal from the modulation unit 12 controls the opening and the closing of an electronic switch 14, currents i1, i2 are taken in alternately and converted into pulse signals 15 in proportion to an electric power, thus, being digitally displayed in a display unit 17 through a frequency dividing circuit 16.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15277079A JPS5676053A (en) | 1979-11-26 | 1979-11-26 | Electronic type wattmeter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15277079A JPS5676053A (en) | 1979-11-26 | 1979-11-26 | Electronic type wattmeter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5676053A true JPS5676053A (en) | 1981-06-23 |
Family
ID=15547761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15277079A Pending JPS5676053A (en) | 1979-11-26 | 1979-11-26 | Electronic type wattmeter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5676053A (en) |
-
1979
- 1979-11-26 JP JP15277079A patent/JPS5676053A/en active Pending
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