JPS5537952A - Instrumentation circuit - Google Patents

Instrumentation circuit

Info

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
Application number
JP11128978A
Other languages
Japanese (ja)
Inventor
Shigeto Oyabu
Hideo Takenaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Engineering Corp
Toshiba Corp
Original Assignee
Toshiba Engineering Corp
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Engineering Corp, Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Engineering Corp
Priority to JP11128978A priority Critical patent/JPS5537952A/en
Publication of JPS5537952A publication Critical patent/JPS5537952A/en
Pending legal-status Critical Current

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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
JP11128978A 1978-09-12 1978-09-12 Instrumentation circuit Pending JPS5537952A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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