JPS5537952A - Instrumentation circuit - Google Patents
Instrumentation circuitInfo
- Publication number
- JPS5537952A JPS5537952A JP11128978A JP11128978A JPS5537952A JP S5537952 A JPS5537952 A JP S5537952A JP 11128978 A JP11128978 A JP 11128978A JP 11128978 A JP11128978 A JP 11128978A JP S5537952 A JPS5537952 A JP S5537952A
- Authority
- JP
- Japan
- Prior art keywords
- value
- measured
- coefficient resistance
- reference value
- measurement
- 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
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
PURPOSE: To obtain a circuit which provides easy and precise measurement of small variation of a difference between a reference value and measured value by expanding the scale value of an indicator as to the small variation around the reference value, in a system where the difference varies greately.
CONSTITUTION: Although current (iM)1-73 to be measured is integrated by operational amplifier 1-8, output VO of it depends upon coefficient resistance 1-9 or 2-4. Now, denoting resistances 1-9 and 2-4 by R and R' results in VO=R×iM. Here, changing coefficient resistance 2-4 over to the 2-4 side with R'=2R obtains VO= R'×iM, thereby obtaining a double output voltage by the same input (iM). Namely, (1/2)IM to fullscale value IM can be expanded to the full scale and variation around the reference value can be measured with a double scale value. As a result, the coefficient resistance is only changed over by push button switch 2-1 for expansion measurement; several coefficient resistance circuits are used corresponding to the degree of the expansion and resistance values are selected, so that multi-range fine measurement can be attained by one instrumentation circuit.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11128978A JPS5537952A (en) | 1978-09-12 | 1978-09-12 | Instrumentation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11128978A JPS5537952A (en) | 1978-09-12 | 1978-09-12 | Instrumentation circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5537952A true JPS5537952A (en) | 1980-03-17 |
Family
ID=14557440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11128978A Pending JPS5537952A (en) | 1978-09-12 | 1978-09-12 | Instrumentation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5537952A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5867355A (en) * | 1981-10-16 | 1983-04-21 | 株式会社 サタケ | Swinging apparatus of grain sorting machine |
-
1978
- 1978-09-12 JP JP11128978A patent/JPS5537952A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5867355A (en) * | 1981-10-16 | 1983-04-21 | 株式会社 サタケ | Swinging apparatus of grain sorting machine |
JPS6353869B2 (en) * | 1981-10-16 | 1988-10-25 | Satake Eng Co Ltd |
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