JPS55106328A - Multi-spot temperature measuring device - Google Patents

Multi-spot temperature measuring device

Info

Publication number
JPS55106328A
JPS55106328A JP1373479A JP1373479A JPS55106328A JP S55106328 A JPS55106328 A JP S55106328A JP 1373479 A JP1373479 A JP 1373479A JP 1373479 A JP1373479 A JP 1373479A JP S55106328 A JPS55106328 A JP S55106328A
Authority
JP
Japan
Prior art keywords
terminal
resistance
lead
amplifier
change
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
Application number
JP1373479A
Other languages
Japanese (ja)
Other versions
JPS5838730B2 (en
Inventor
Yoshihiro Okano
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works 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 Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Hokushin Electric Corp
Priority to JP1373479A priority Critical patent/JPS5838730B2/en
Publication of JPS55106328A publication Critical patent/JPS55106328A/en
Publication of JPS5838730B2 publication Critical patent/JPS5838730B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To reduce the effects of the lead wire resistance and the contact resistance by measuring the three-wire type thermoresistance in the four-wire system by means of the change-over switch of the three-circuit.
CONSTITUTION: Lead terminal (c) of plural number of three-wire type temperature- sensing element Rt is connected to the plus terminal of differential amplifier A1 featuring the sufficiently high input impedance via change-over switch S3. And lead terminal (b) is connected to the minus terminal of amplifier A1 via resistances R1 and R0. On the other hand, lead terminal (a) is connected to the plus and minus terminals each of differential amplifier A2 via two change-over switches S2 and S1, and the output terminal of amplifier A2 is connected to common connection point (d) of resistances R3 and R4 via resistance R7. Accordingly, current It flowing to element Rt does not flow to the input side of amplifier A1 by selecting R1 enough larger than the signal source resistance. And thus the plus terminal potential of A1 becomes identical to the potential of terminal (c), receiving no effect of the contact resistance of both lead resistance r3 and switch S3.
COPYRIGHT: (C)1980,JPO&Japio
JP1373479A 1979-02-08 1979-02-08 Multi-point temperature measuring device Expired JPS5838730B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1373479A JPS5838730B2 (en) 1979-02-08 1979-02-08 Multi-point temperature measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1373479A JPS5838730B2 (en) 1979-02-08 1979-02-08 Multi-point temperature measuring device

Publications (2)

Publication Number Publication Date
JPS55106328A true JPS55106328A (en) 1980-08-15
JPS5838730B2 JPS5838730B2 (en) 1983-08-25

Family

ID=11841470

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1373479A Expired JPS5838730B2 (en) 1979-02-08 1979-02-08 Multi-point temperature measuring device

Country Status (1)

Country Link
JP (1) JPS5838730B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5279145A (en) * 1990-10-22 1994-01-18 Mitsubishi Denki K.K. Heater control device for an air-fuel ratio sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5279145A (en) * 1990-10-22 1994-01-18 Mitsubishi Denki K.K. Heater control device for an air-fuel ratio sensor

Also Published As

Publication number Publication date
JPS5838730B2 (en) 1983-08-25

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