JPS55106328A - Multi-spot temperature measuring device - Google Patents
Multi-spot temperature measuring deviceInfo
- 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
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
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)
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 |
-
1979
- 1979-02-08 JP JP1373479A patent/JPS5838730B2/en not_active Expired
Cited By (1)
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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