JPS5730959A - Current measuring device - Google Patents
Current measuring deviceInfo
- Publication number
- JPS5730959A JPS5730959A JP10594280A JP10594280A JPS5730959A JP S5730959 A JPS5730959 A JP S5730959A JP 10594280 A JP10594280 A JP 10594280A JP 10594280 A JP10594280 A JP 10594280A JP S5730959 A JPS5730959 A JP S5730959A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- measurement
- gate
- time
- output
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
PURPOSE:To enable lengthening of a measuring time and the improvement of a precision, by a method wherein, when an output of an integrating capacitor, whereto a voltage corresponding to a measurement current is applied, is produced into a given level, a reference voltage is applied in an overlapping manner to the capacitor. CONSTITUTION:With a switch 7 closed, a measurement current 1 flows to a load resistance 2, and voltages at the opposite ends of the resistor 2 are integrated by means of integrating circuits 4, 5, and 6. If an output of an operational amplifier 4 reaches a voltage of a reference voltage source 31, a comparator 32 actuates, a switch 8a is closed and a switch 8b is opened through a program-setting circuit 13 to flow a reference current 9 to the load resistance 2, and simultaneously, to open a gate 15. After a given time has elapsed after measurement starts, the switch 7a opens and 7b closes, and at the point of time when the output of the operational amplifier 4 is brought into a null position, the gate 15 closes. A clock pulse from a pulse generator 14, passing through the gate 15, is counted to measure a measurement current. This increases a ratio of the measurement time to a measuring period, and permits the reduction of the influence exerted by disturbance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10594280A JPH0245154B2 (en) | 1980-07-31 | 1980-07-31 | DENRYUSOKUTEISOCHI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10594280A JPH0245154B2 (en) | 1980-07-31 | 1980-07-31 | DENRYUSOKUTEISOCHI |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5730959A true JPS5730959A (en) | 1982-02-19 |
| JPH0245154B2 JPH0245154B2 (en) | 1990-10-08 |
Family
ID=14420894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10594280A Expired - Lifetime JPH0245154B2 (en) | 1980-07-31 | 1980-07-31 | DENRYUSOKUTEISOCHI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0245154B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59138696A (en) * | 1983-01-31 | 1984-08-09 | 東亜建設工業株式会社 | Sea bottom tunnel construction method |
-
1980
- 1980-07-31 JP JP10594280A patent/JPH0245154B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59138696A (en) * | 1983-01-31 | 1984-08-09 | 東亜建設工業株式会社 | Sea bottom tunnel construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0245154B2 (en) | 1990-10-08 |
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