JPS54100763A - Digital meter - Google Patents
Digital meterInfo
- Publication number
- JPS54100763A JPS54100763A JP769178A JP769178A JPS54100763A JP S54100763 A JPS54100763 A JP S54100763A JP 769178 A JP769178 A JP 769178A JP 769178 A JP769178 A JP 769178A JP S54100763 A JPS54100763 A JP S54100763A
- Authority
- JP
- Japan
- Prior art keywords
- converter
- fed
- digital signals
- digital
- offset
- 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 improve the metering accuracy by theoretically elliminating the error due to the offset of an A/D converter in response to the positive and negative digital signals which are generated by changing the polarity of the input of the A/D converter.
CONSTITUTION: The analog signals A of a transducer 1 are fed through a notmally closed contact 6b to an A/D converter 3, where they are converted into digital signals Dp so that they are fed to a date processing device 51. This device 51 partly stores the digital signals and partly operates an auxiliary relay 6 thereby to open a normally closed contact 6b but to close a normally open contact 6a. As a result, the A/D converter 3 converts the analog signals having inverted polarity into digital values DN and feeds them to the data processing device 51 so that they may be stored. The device 51 calculates the digital values of (DP - DN)/2 and displays or stores it while stopping its output which has been fed to a signal line 7. By periodically repeating a series of such operations, the error due to offset can be eliminated.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP769178A JPS54100763A (en) | 1978-01-25 | 1978-01-25 | Digital meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP769178A JPS54100763A (en) | 1978-01-25 | 1978-01-25 | Digital meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54100763A true JPS54100763A (en) | 1979-08-08 |
Family
ID=11672794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP769178A Pending JPS54100763A (en) | 1978-01-25 | 1978-01-25 | Digital meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54100763A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59183525A (en) * | 1983-04-01 | 1984-10-18 | Fujitsu Ltd | Analog-digital converting circuit |
| JPS60167440U (en) * | 1984-04-16 | 1985-11-07 | 日本コロムビア株式会社 | Digital-analog conversion circuit |
| JPS61123313A (en) * | 1984-11-20 | 1986-06-11 | Nec Corp | Analog-digital converting circuit |
| US4616329A (en) * | 1983-08-26 | 1986-10-07 | Bio-Rad Laboratories, Inc. | Self-calibrating adaptive ranging apparatus and method |
| JPS62169526A (en) * | 1986-01-21 | 1987-07-25 | Yamato Scale Co Ltd | Analog-digital converting device |
| JPS6355633U (en) * | 1986-09-29 | 1988-04-14 | ||
| JPS63215117A (en) * | 1987-03-03 | 1988-09-07 | Yamato Scale Co Ltd | Analog-digital converter |
-
1978
- 1978-01-25 JP JP769178A patent/JPS54100763A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59183525A (en) * | 1983-04-01 | 1984-10-18 | Fujitsu Ltd | Analog-digital converting circuit |
| US4616329A (en) * | 1983-08-26 | 1986-10-07 | Bio-Rad Laboratories, Inc. | Self-calibrating adaptive ranging apparatus and method |
| JPS60167440U (en) * | 1984-04-16 | 1985-11-07 | 日本コロムビア株式会社 | Digital-analog conversion circuit |
| JPS61123313A (en) * | 1984-11-20 | 1986-06-11 | Nec Corp | Analog-digital converting circuit |
| JPH0511446B2 (en) * | 1984-11-20 | 1993-02-15 | Nippon Electric Co | |
| JPS62169526A (en) * | 1986-01-21 | 1987-07-25 | Yamato Scale Co Ltd | Analog-digital converting device |
| JPS6355633U (en) * | 1986-09-29 | 1988-04-14 | ||
| JPH0427222Y2 (en) * | 1986-09-29 | 1992-06-30 | ||
| JPS63215117A (en) * | 1987-03-03 | 1988-09-07 | Yamato Scale Co Ltd | Analog-digital converter |
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