JPS5487280A - Analog input circuit - Google Patents
Analog input circuitInfo
- Publication number
- JPS5487280A JPS5487280A JP15516277A JP15516277A JPS5487280A JP S5487280 A JPS5487280 A JP S5487280A JP 15516277 A JP15516277 A JP 15516277A JP 15516277 A JP15516277 A JP 15516277A JP S5487280 A JPS5487280 A JP S5487280A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- thermocouple
- metering
- capacitor
- circuit
- 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
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
PURPOSE: To make possible to economically detect the opening of a thermocouple by charging a capacitor before the next metering operation and by subsequently discharging the charged voltage to a circuit having a thermocouple.
CONSTITUTION: The voltage at a metering point is stored by a thermocouple 1 in a capacitor 6 and then is converted into a temperature value by a CPU through an amplifier 9 and an A/D converter 10. Before the metering operation of the same point after the subsequent point or a preset time lapse is accomplished, the capacitor 6 is charged at such a DC voltage 16 as sufficiently high in comparison with the voltage generated in the thermocouple 1. The charged voltage resulting from the DC voltage is discharged to the circuit having the thermocouple 1. When the thermocouple 1 is open, the DC voltage sufficiently higher than the signal voltage at the subsequent or same point is impressed upon the metering circuit thereby to make it possible to easily judge the existence of the opening.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15516277A JPS5487280A (en) | 1977-12-23 | 1977-12-23 | Analog input circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15516277A JPS5487280A (en) | 1977-12-23 | 1977-12-23 | Analog input circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5487280A true JPS5487280A (en) | 1979-07-11 |
Family
ID=15599864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15516277A Pending JPS5487280A (en) | 1977-12-23 | 1977-12-23 | Analog input circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5487280A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6065627U (en) * | 1983-10-14 | 1985-05-09 | 横河電機株式会社 | multi-point recorder |
JPS6321525A (en) * | 1986-07-15 | 1988-01-29 | Sekisui Chem Co Ltd | Thermocouple disconnection detecting circuit |
JPH02145930A (en) * | 1988-11-28 | 1990-06-05 | Fenwall Controls Of Japan Ltd | Multi-point type temperature sensor |
-
1977
- 1977-12-23 JP JP15516277A patent/JPS5487280A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6065627U (en) * | 1983-10-14 | 1985-05-09 | 横河電機株式会社 | multi-point recorder |
JPS6321525A (en) * | 1986-07-15 | 1988-01-29 | Sekisui Chem Co Ltd | Thermocouple disconnection detecting circuit |
JPH02145930A (en) * | 1988-11-28 | 1990-06-05 | Fenwall Controls Of Japan Ltd | Multi-point type temperature sensor |
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