JPH0288135U - - Google Patents
Info
- Publication number
- JPH0288135U JPH0288135U JP16683788U JP16683788U JPH0288135U JP H0288135 U JPH0288135 U JP H0288135U JP 16683788 U JP16683788 U JP 16683788U JP 16683788 U JP16683788 U JP 16683788U JP H0288135 U JPH0288135 U JP H0288135U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- constant current
- lead wire
- current source
- amplifier
- 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
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 7
- 238000001514 detection method Methods 0.000 claims 3
- 239000004065 semiconductor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 1
Description
第１図は本案に係るバーンアウト回路を備えた
測温抵抗体式温度変換器の一実施例を示す図、第
２図ａ〜ｅは第１図に示す実施例の異常時におけ
る等価回路図、第３図はバーンアウト回路を有し
ない従来の測温抵抗体式温度変換器の一実施例を
示す図、第４図ａ〜ｅは第３図に示す実施例の異
常時における等価回路図である。
Ｒ１……抵抗、Ｄ１……ダイオード、Ｑ１，Ｑ
２……トランジスタ。
FIG. 1 is a diagram showing an embodiment of a resistance temperature detector type temperature converter equipped with a burnout circuit according to the present invention, and FIGS. 2 a to 2 e are equivalent circuit diagrams of the embodiment shown in FIG. FIG. 3 is a diagram showing an embodiment of a conventional resistance temperature detector type temperature converter without a burnout circuit, and FIGS. 4 a to 4 e are equivalent circuit diagrams of the embodiment shown in FIG. 3 in the event of an abnormality. . R1...Resistor, D1...Diode, Q1,Q
2...transistor.
Claims (1)
検出用リード線とを分岐して有し、他端に第２の
電流供給用リード線と第２の電圧検出用リード線
とを分岐して有する４線式の被測定抵抗体と、高
入力インピーダンスの増幅器と、定電流源とを具
備し、前記定電流源から前記第１、第２の電流供
給用リード線を介して前記被測定抵抗体に定電流
を流し、前記被測定抵抗体の両端に発生する電圧
を、前記第１及び第２の電圧検出用リード線を介
して前記増幅器の第１及び第２の入力端に印加し
、前記増幅器で所望の電圧に増幅するように成し
た４線式測定抵抗体を用いた抵抗・電気信号変換
器において、前記定電流源から前記第１の電流供
給用リード線に至る回路間に第１のトランジスタ
のコレクタとベース電極とを定電流源側に、エミ
ツタ電極を第１の電流供給用リード線側にそれぞ
れ接続すると共に、前記定電流源の出力端から一
方向性半導体素子を介して第２のトランジスタの
ベース電極へ接続すると共に、前記第２のトラン
ジスタのコレクタ電極を前記定電流源の出力端に
、エミツタ電極を前記定電流源と前記第２の電流
供給用リード線との交点にそれぞれ接続すると共
に、前記増幅器の第１及び第２の入力端の間に高
インピーダンスを有する抵抗を接続することによ
り、前記４線式被測定抵抗体のいずれの断線モー
ドにおいても前記増幅器の出力信号を確実に下限
に振り切らせるようにしたことを特徴とする４線
式被測定抵抗体のバーンアウト回路。 A first current supply lead wire and a first voltage detection lead wire are branched at one end, and a second current supply lead wire and a second voltage detection lead wire are branched at the other end. a four-wire resistor to be measured, a high input impedance amplifier, and a constant current source; A constant current is passed through the resistor to be measured, and a voltage generated across the resistor to be measured is applied to the first and second input terminals of the amplifier via the first and second voltage detection lead wires. In the resistance/electrical signal converter using a four-wire measuring resistor configured to amplify the voltage to a desired voltage with the amplifier, the voltage between the circuits from the constant current source to the first current supply lead wire is The collector and base electrodes of the first transistor are connected to the constant current source side, the emitter electrode is connected to the first current supply lead wire side, and the unidirectional semiconductor element is connected from the output end of the constant current source. The collector electrode of the second transistor is connected to the output terminal of the constant current source, and the emitter electrode is connected to the constant current source and the second current supply lead wire. By connecting a resistor having a high impedance between the first and second input terminals of the amplifier, the amplifier A burnout circuit for a four-wire resistor under test, characterized in that the output signal of the resistor under test is reliably swung to its lower limit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16683788U JPH0288135U (en) | 1988-12-26 | 1988-12-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16683788U JPH0288135U (en) | 1988-12-26 | 1988-12-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0288135U true JPH0288135U (en) | 1990-07-12 |
Family
ID=31454581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16683788U Pending JPH0288135U (en) | 1988-12-26 | 1988-12-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0288135U (en) |
-
1988
- 1988-12-26 JP JP16683788U patent/JPH0288135U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0288135U (en) | ||
| JPH0749540Y2 (en) | Semiconductor integrated circuit device | |
| JPH0281478U (en) | ||
| JP2824360B2 (en) | Semiconductor device for current detection | |
| JP2705142B2 (en) | Semiconductor integrated circuit device | |
| JPS58116202U (en) | Current detection resistor for glow plugs | |
| JPH0651000Y2 (en) | Molded photodiode | |
| JP2715603B2 (en) | Semiconductor device | |
| JPS63106289U (en) | ||
| JPH03106471U (en) | ||
| JPH0338708Y2 (en) | ||
| JPS62145349U (en) | ||
| JPS63132328U (en) | ||
| JPS6296582U (en) | ||
| JPS5836370U (en) | resistance measurement circuit | |
| JPS6358772U (en) | ||
| JPH02128571U (en) | ||
| JPS61182856U (en) | ||
| JPS58182511U (en) | semiconductor integrated circuit | |
| JPS58127369U (en) | Measuring device for PNP transistor | |
| JPS63168867U (en) | ||
| JPS63114314U (en) | ||
| JPS59131071U (en) | voltage monitoring device | |
| JPS5857980U (en) | resistance measurement circuit | |
| JPH0239177U (en) |