JPS56137255A - Measuring device of multipoint resistance variation - Google Patents

Measuring device of multipoint resistance variation

Info

Publication number
JPS56137255A
JPS56137255A JP4035680A JP4035680A JPS56137255A JP S56137255 A JPS56137255 A JP S56137255A JP 4035680 A JP4035680 A JP 4035680A JP 4035680 A JP4035680 A JP 4035680A JP S56137255 A JPS56137255 A JP S56137255A
Authority
JP
Japan
Prior art keywords
input terminal
input
output
resistor
terminal
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
JP4035680A
Other languages
Japanese (ja)
Inventor
Hiromi Chiba
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4035680A priority Critical patent/JPS56137255A/en
Publication of JPS56137255A publication Critical patent/JPS56137255A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

PURPOSE:To prevent an output from having a floating potential by a method wherein, when variations in resistance is measured by permitting a constant-current to flow into a resistor to obtain output voltage rough addition and subtraction, a specially constructed 3-input adder-subtracter is used. CONSTITUTION:A resistor Rt is a temperature sensing resistor. A conductive wire L1 is connected to an input terminal A and the first input terminal 1 of the 3-input adder-substracter AD4 via the contact point SA of a change-over switch, while L2 and L3 are connected to the second input terminal 2 and the third terminal 3, respectively. The AD4 contains 2 operational amplifiers OP1, OP2, and the positive phase input end of the OP1 is connected to the input terminal 2. The negative- phase input end of the OP1 is connected to the common potential P through the R1, to the output end of the OP1 through the R2, while the positive-phase input of the OP2 is connected to the input terminal 1 and the negative phase input end is connected to the output end of OP1 through the R3, to the output end of the OP2 through the R4 and to the third input terminal 3 through the R5. By adopting proper values for R1-R5, E05=(1+R4/R3)DELTARt.i as the output of the OP2 can be obtained.
JP4035680A 1980-03-31 1980-03-31 Measuring device of multipoint resistance variation Pending JPS56137255A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4035680A JPS56137255A (en) 1980-03-31 1980-03-31 Measuring device of multipoint resistance variation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4035680A JPS56137255A (en) 1980-03-31 1980-03-31 Measuring device of multipoint resistance variation

Publications (1)

Publication Number Publication Date
JPS56137255A true JPS56137255A (en) 1981-10-27

Family

ID=12578354

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4035680A Pending JPS56137255A (en) 1980-03-31 1980-03-31 Measuring device of multipoint resistance variation

Country Status (1)

Country Link
JP (1) JPS56137255A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6212873A (en) * 1985-07-10 1987-01-21 Mitsubishi Electric Corp Multipoint three wire measuring circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54126565A (en) * 1978-03-24 1979-10-01 Hitachi Ltd Resistance-electric signal converter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54126565A (en) * 1978-03-24 1979-10-01 Hitachi Ltd Resistance-electric signal converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6212873A (en) * 1985-07-10 1987-01-21 Mitsubishi Electric Corp Multipoint three wire measuring circuit

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