JP2675467B2 - Multi-point temperature measuring device - Google Patents
Multi-point temperature measuring deviceInfo
- Publication number
- JP2675467B2 JP2675467B2 JP3303362A JP30336291A JP2675467B2 JP 2675467 B2 JP2675467 B2 JP 2675467B2 JP 3303362 A JP3303362 A JP 3303362A JP 30336291 A JP30336291 A JP 30336291A JP 2675467 B2 JP2675467 B2 JP 2675467B2
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- resistance
- resistance value
- temperature
- output voltage
- 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.)
- Expired - Fee Related
Links
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- Measuring Temperature Or Quantity Of Heat (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、複数の測温抵抗体を
切り換えるスイッチのオン抵抗の影響を最小限にできる
多点温度測定装置の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a multipoint temperature measuring device which can minimize the influence of the on resistance of a switch for switching a plurality of resistance temperature detectors.
【０００２】[0002]
【従来の技術】スイッチのオン抵抗の影響を除去するこ
とができる多点温度測定装置が、例えば特開平２−１２
４４３６号公報に示されている。この装置によれば、測
温抵抗体の各端子Ｔａ、Ｔｂ、Ｔｃの各電圧をスイッチ
を通じて測定し、これらの測定結果に基づいて端子毎の
演算増幅器で所定の演算を行うことにより、測温抵抗体
までのリード線抵抗とオン抵抗の影響を除去することが
できる。2. Description of the Related Art A multi-point temperature measuring device capable of eliminating the influence of on-resistance of a switch is disclosed in, for example, Japanese Patent Laid-Open No. 2-12.
It is disclosed in Japanese Patent No. 4436. According to this device, the temperature of each of the terminals Ta, Tb, and Tc of the resistance temperature detector is measured through the switch, and the operational amplifier for each terminal performs a predetermined calculation based on the measurement result, thereby measuring the temperature. It is possible to eliminate the influence of lead wire resistance up to the resistor and on resistance.
【０００３】測温抵抗体として０℃で１００Ω（オー
ム）の白金を使用した場合について説明する。例えば、
０〜１００℃を測定するとき、定電流源電流を２ｍＡと
すると、白金の抵抗値が１００〜１３９．２Ω／０〜１
００℃であるので、測温抵抗体の端子Ｔａ、Ｔｂ間に
は、２００〜２７８．４ｍＶ／０〜１００℃の電圧が得
られる。これは、出力スパンは、７８．４ｍＶしかない
のに、測定範囲は２７８．４ｍＶ必要となる。A case where 100 Ω (ohm) platinum at 0 ° C. is used as the resistance temperature detector will be described. For example,
When measuring 0 to 100 ° C., assuming that the constant current source current is 2 mA, the resistance value of platinum is 100 to 139.2 Ω / 0-1.
Since the temperature is 00 ° C., a voltage of 200 to 278.4 mV / 0 to 100 ° C. can be obtained between the terminals Ta and Tb of the resistance temperature detector. This requires a measurement range of 278.4 mV even though the output span is only 78.4 mV.
【０００４】[0004]
【発明が解決しようとする課題】上述したような従来の
多点温度測定装置では、その出力が測温抵抗体の抵抗値
に比例しているので、０℃において、かなり大きな出力
電圧を生じて、使用温度範囲に対応した出力のダイナミ
ックレンジを大きくとれず、この出力をＡ／Ｄ変換する
場合には分解能が低く、高精度の温度測定ができず、測
温抵抗体の各種定格品に応じて別の製品を用意する必要
があるという問題点があった。また、定電流源の変動に
よって出力に誤差を生じるという問題点があった。In the conventional multipoint temperature measuring device as described above, its output is proportional to the resistance value of the resistance temperature detector, so that a considerably large output voltage is generated at 0 ° C. The dynamic range of the output corresponding to the operating temperature range cannot be widened, and when this output is A / D converted, the resolution is low, and highly accurate temperature measurement cannot be performed. There was a problem that it was necessary to prepare another product. Further, there is a problem that an error occurs in the output due to the fluctuation of the constant current source.
【０００５】この発明は、前述した問題点を解決するた
めになされたもので、ダイナミックレンジを大きくと
れ、高精度の温度測定を可能とすることができる多点温
度測定装置を得ることを目的とする。The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to obtain a multipoint temperature measuring device which can take a wide dynamic range and can perform highly accurate temperature measurement. To do.
【０００６】また、この発明は、測温抵抗体の定格抵抗
値にかかわらず、出力をほぼ同じ大きさになるようにし
て高精度の温度測定を可能とすることができる多点温度
測定装置を得ることを目的とする。Further, the present invention provides a multi-point temperature measuring device capable of highly accurate temperature measurement by making the outputs have substantially the same magnitude regardless of the rated resistance value of the resistance temperature detector. The purpose is to get.
【０００７】さらに、この発明は、定電流源の変動によ
る出力誤差をなくすことができる多点温度測定装置を得
ることを目的とする。A further object of the present invention is to provide a multipoint temperature measuring device which can eliminate an output error due to a fluctuation of a constant current source.
【０００８】[0008]
【課題を解決するための手段】この発明の請求項１に係
る多点温度測定装置は、一端に第１の端子を有し他端に
第２の端子及び第３の端子を有するとともに定格抵抗値
として０℃において第１の抵抗値を持つ第１の測温抵抗
体と、一端に第１の端子を有し他端に第２の端子及び第
３の端子を有するとともに定格抵抗値として０℃におい
て第２の抵抗値を持つ第２の測温抵抗体とを切換スイッ
チにより切り換えて温度を測定する多点温度測定装置に
おいて、前記切換スイッチを介して前記第１及び第２の
測温抵抗体の第１の端子に接続された定電流源と、共通
接続された前記第１及び第２の測温抵抗体の第２の端子
と回路アースとの間に接続され前記第１の抵抗値を持つ
第１の基準抵抗と、共通接続された前記第１及び第２の
測温抵抗体の第２の端子と回路アースとの間に接続され
前記第２の抵抗値を持つ第２の基準抵抗と、使用する前
記第１及び第２の測温抵抗体の定格抵抗値に応じて前記
第１又は第２の基準抵抗を選択する選択手段と、前記第
２の端子から供給される出力電圧、前記切換スイッチを
介して前記第１の端子から供給される出力電圧及び前記
第３の端子から供給される出力電圧、並びに前記選択手
段から供給される基準電圧に基づいて測定温度に応じた
出力電圧を得る増幅手段とを備えたものである。 A multipoint temperature measuring device according to claim 1 of the present invention has a first terminal at one end and another end at the other end.
Rated resistance value with the second and third terminals
First temperature measuring resistor having a first resistance value at 0 ° C
A body having a first terminal at one end and a second terminal and a second terminal at the other end
It has 3 terminals and it has a rated resistance of 0 ℃.
Switch between the second resistance temperature detector having the second resistance value.
For multi-point temperature measurement device that switches temperature by measuring
, The first and second via the changeover switch
Common with the constant current source connected to the first terminal of the resistance thermometer
Second terminals of the connected first and second resistance temperature detectors
Connected to the circuit ground and has the first resistance value
A first reference resistor and the first and second commonly connected
Connected between the second terminal of the resistance thermometer and the circuit ground
A second reference resistor having the second resistance value and before use
According to the rated resistance value of the first and second resistance temperature detectors,
Selecting means for selecting a first or second reference resistance;
The output voltage supplied from the 2 terminal, the changeover switch
The output voltage supplied from the first terminal via
The output voltage supplied from the third terminal and the selector
According to the measured temperature based on the reference voltage supplied from the stage
And an amplifying means for obtaining an output voltage.
【０００９】この発明の請求項２に係る多点温度測定装
置は、一端に第１の端子を有し他端に第２の端子及び第
３の端子を有するとともに定格抵抗値として０℃におい
て第１の抵抗値を持つ第１の測温抵抗体と、一端に第１
の端子を有し他端に第２の端子及び第３の端子を有する
とともに定格抵抗値として０℃において第２の抵抗値を
持つ第２の測温抵抗体とを切換スイッチにより切り換え
て温度を測定する多点温度測定装置において、前記切換
スイッチを介して前記第１及び第２の測温抵抗体の第１
の端子に接続された定電流源と、共通接続された前記第
１及び第２の測温抵抗体の第２の端子と回路アースとの
間に接続され前記第１の抵抗値を持つ第１の基準抵抗
と、共通接続された前記第１及び第２の測温抵抗体の第
２の端子と回路アースとの間に接続され前記第２の抵抗
値を持つ第２の基準抵抗と、使用する前記第１及び第２
の測温抵抗体の定格抵抗値に応じて前記第１又は第２の
基準抵抗を選択する第１の選択手段と、前記第２の端子
から供給される出力電圧、前記切換スイッチを介して前
記第１の端子から供給される出力電圧及び前記第３の端
子から供給される出力電圧、並びに前記選択手段から供
給される基準電圧に基づいて測定温度に応じた出力電圧
を得る第１の増幅手段と、前記第１の増幅手段の出力電
圧を所定の増幅度で増幅する第２の増幅手段と、前記第
２の増幅手段の増幅度を使用する前記第１及び第２の測
温抵抗体の定格抵抗値に応じて選択する第２の選択手段
とを備えたものである。 A multipoint temperature measuring device according to a second aspect of the present invention has a first terminal at one end and a second terminal and a second terminal at the other end.
It has 3 terminals and it has a rated resistance of 0 ℃.
And a first resistance temperature detector having a first resistance value, and a first resistance at one end
And a second terminal and a third terminal at the other end
And the second resistance value at 0 ° C as the rated resistance value
Switch to the second resistance temperature detector with
In a multi-point temperature measuring device that measures temperature by
The first of the first and second resistance temperature detectors via a switch
Constant current source connected to the terminal of the
Between the second terminals of the first and second resistance temperature detectors and the circuit ground
A first reference resistor connected between and having the first resistance value
And the first and second resistance temperature detectors connected in common
The second resistor connected between the second terminal and the circuit ground.
A second reference resistor having a value and the first and second resistors used
According to the rated resistance value of the resistance temperature detector of the
First selection means for selecting a reference resistance, and the second terminal
Output voltage supplied from the front via the changeover switch
The output voltage supplied from the first terminal and the third end
The output voltage supplied from the child and the output voltage supplied from the selecting means.
Output voltage according to the measured temperature based on the supplied reference voltage
And first output means for obtaining the output power of the first amplification means.
Second amplification means for amplifying the pressure with a predetermined amplification degree;
The first and second measurements using the amplification degree of the second amplification means.
Second selection means for selecting according to the rated resistance value of the temperature resistance element
It is provided with.
【００１０】この発明の請求項３に係る多点温度測定装
置は、一端に第１の端子を有し他端に第２の端子及び第
３の端子を有するとともに定格抵抗値として０℃におい
て第１の抵抗値を持つ第１の測温抵抗体と、一端に第１
の端子を有し他端に第２の端子及び第３の端子を有する
とともに定格抵抗値として０℃において第２の抵抗値を
持つ第２の測温抵抗体とを切換スイッチにより切り換え
て温度を測定する多点温度測定装置において、前記切換
スイッチを介して前記第１及び第２の測温抵抗体の第１
の端子に接続された定電流源と、共通接続された前記第
１及び第２の測温抵抗体の第２の端子と回路アースとの
間に接続され前記第１の抵抗値を持つ第１の基準抵抗
と、共通接続された前記第１及び第２の測温抵抗体の第
２の端子と回路アースとの間に接続され前記第２の抵抗
値を持つ第２の基準抵抗と、使用する前記第１及び第２
の測温抵抗体の定格抵抗値に応じて前記第１又は第２の
基準抵抗を選択する第１の選択手段と、前記第２の端子
から供給される出力電圧、前記切換スイッチを介して前
記第１の端子から供給される出力電圧及び前記第３の端
子から供給される出力電圧、並びに前記選択手段から供
給される基準電圧に基づいて測定温度に応じた出力電圧
を得る第１の増幅手段と、前記第１の増幅手段の出力電
圧を所定の増幅度で増幅する第２の増幅手段と、前記第
２の増幅手段の増幅度を使用する前記第１及び第２の測
温抵抗体の定格抵抗値に応じて選択する第２の選択手段
と、前記第１及び第２の測温抵抗体に電流を供給するた
めの前記定電流源を生成する電源電圧Ｖｚ及び前記第２
の増幅手段の出力電圧Ｅ１に基づいてＥ１／Ｖｚの演算
を行うＡ／Ｄ変換器とを備えたものである。 A multipoint temperature measuring device according to claim 3 of the present invention has a first terminal at one end and a second terminal and a second terminal at the other end.
It has 3 terminals and it has a rated resistance of 0 ℃.
And a first resistance temperature detector having a first resistance value, and a first resistance at one end
And a second terminal and a third terminal at the other end
And the second resistance value at 0 ° C as the rated resistance value
Switch to the second resistance temperature detector with
In a multi-point temperature measuring device that measures temperature by
The first of the first and second resistance temperature detectors via a switch
Constant current source connected to the terminal of the
Between the second terminals of the first and second resistance temperature detectors and the circuit ground
A first reference resistor connected between and having the first resistance value
And the first and second resistance temperature detectors connected in common
The second resistor connected between the second terminal and the circuit ground.
A second reference resistor having a value and the first and second resistors used
According to the rated resistance value of the resistance temperature detector of the
First selection means for selecting a reference resistance, and the second terminal
Output voltage supplied from the front via the changeover switch
The output voltage supplied from the first terminal and the third end
The output voltage supplied from the child and the output voltage supplied from the selecting means.
Output voltage according to the measured temperature based on the supplied reference voltage
And first output means for obtaining the output power of the first amplification means.
Second amplification means for amplifying the pressure with a predetermined amplification degree;
The first and second measurements using the amplification degree of the second amplification means.
Second selection means for selecting according to the rated resistance value of the temperature resistance element
And to supply a current to the first and second resistance temperature detectors.
Power supply voltage Vz for generating the constant current source and the second
Of E1 / Vz based on the output voltage E1 of the amplifying means
And an A / D converter for performing.
【００１１】[0011]
【作用】この発明の請求項１に係る多点温度測定装置に
おいて、選択手段によって、使用する第１及び第２の測
温抵抗体の定格抵抗値に応じて第１又は第２の基準抵抗
が選択され、増幅手段によって、第２の端子から供給さ
れる出力電圧、切換スイッチを介して第１の端子から供
給される出力電圧及び第３の端子から供給される出力電
圧、並びに前記選択手段から供給される基準電圧に基づ
いて測定温度に応じた出力電圧が得られる。 In the multipoint temperature measuring device according to claim 1 of the present invention.
The first and second measurement to be used are selected by the selecting means.
1st or 2nd reference resistance according to the rated resistance value of the temperature resistor
Is selected and supplied by the amplifying means from the second terminal.
Output voltage, supplied from the first terminal via the changeover switch.
Output voltage supplied and output power supplied from the third terminal
Voltage and the reference voltage supplied from the selecting means.
The output voltage corresponding to the measured temperature can be obtained.
【００１２】この発明の請求項２に係る多点温度測定装
置において、第２の増幅手段によって、第１の増幅手段
の出力電圧が所定の増幅度で増幅され、第２の選択手段
によって、前記第２の増幅手段の増幅度が使用する第１
及び第２の測温抵抗体の定格抵抗値に応じて選択され
る。 A multipoint temperature measuring device according to claim 2 of the present invention.
The second amplification means, the first amplification means
Output voltage is amplified by a predetermined amplification degree, and the second selection means
According to the amplification degree of the second amplification means used by the first
And selected according to the rated resistance value of the second resistance temperature detector.
You.
【００１３】この発明の請求項３に係る多点温度測定装
置において、Ａ／Ｄ変換器によって、第１及び第２の測
温抵抗体に電流を供給するための定電流源を生成する電
源電圧Ｖｚ及び第２の増幅手段の出力電圧Ｅ１に基づい
てＥ１／Ｖｚの演算が行われる。 A multipoint temperature measuring device according to claim 3 of the present invention.
The first and second measurement by the A / D converter
An electric current that generates a constant current source for supplying current to the temperature resistor.
Based on the source voltage Vz and the output voltage E1 of the second amplifying means
E1 / Vz is calculated.
【００１４】[0014]
実施例１．この発明の実施例１の構成を図１を参照しな
がら説明する。図１は、この発明の実施例１を示す回路
図である。なお、各図中、同一符号は同一又は相当部分
を示す。Embodiment 1 FIG. The configuration of the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a circuit diagram showing Embodiment 1 of the present invention. In the drawings, the same reference numerals indicate the same or corresponding parts.
【００１５】図１において、１は定電流源、２は３つの
端子Ｔａ、Ｔｂ、Ｔｃを有する測温抵抗体、３は演算増
幅器、ａ〜ｃ、ｆ〜ｈは切換スイッチである。また、ｒ
はリード線抵抗、Ｒ01、Ｒ02、Ｒ03は基準抵抗、Ｒ11、
Ｒ12、Ｒ13、Ｒ14、Ｒ15は抵抗である。In FIG. 1, 1 is a constant current source, 2 is a temperature measuring resistor having three terminals Ta, Tb and Tc, 3 is an operational amplifier, and a to c and f to h are changeover switches. Also, r
Is a lead wire resistance, R 01 , R 02 , R 03 are reference resistances, R 11 ,
R 12 , R 13 , R 14 and R 15 are resistors.
【００１６】ところで、請求項１に係るこの発明の選択
手段は、前述したこの発明の実施例１では切換スイッチ
ｆ、ｇ、ｈから構成され、この発明の増幅手段は、実施
例１では演算増幅器３、抵抗Ｒ11、Ｒ12、Ｒ13、Ｒ14、
Ｒ15から構成されている。By the way, the selecting means of the present invention according to claim 1 is composed of the changeover switches f, g and h in the first embodiment of the present invention described above, and the amplifying means of the present invention is the operational amplifier in the first embodiment. 3, resistors R 11 , R 12 , R 13 , R 14 ,
It is composed of R 15 .
【００１７】つぎに、前述した実施例１の動作を説明す
る。端子Ｔａ、Ｔｃ、Ｔｂの出力電圧をＥｂ、Ｅｃ、Ｅ
ｄ、切換スイッチｆ〜ｈの出力である基準電圧をＥｚ、
演算増幅器３の出力電圧をＥ0と表すと、以下の式が成
立する。Next, the operation of the above-described first embodiment will be described. The output voltages of the terminals Ta, Tc, Tb are set to Eb, Ec, E
d, the reference voltage output from the changeover switches f to h is Ez,
When the output voltage of the operational amplifier 3 is represented by E 0 , the following equation holds.
【００１８】 Ｅｂ＝（２ｒ＋Ｒｔ＋Ｒ 03 ＋Ｒ 02 ＋Ｒ 01 ）・ｉ Ｅｃ＝（ｒ＋Ｒ 03 ＋Ｒ 02 ＋Ｒ 01 ）・ｉ Ｅｄ＝（Ｒ 03 ＋Ｒ 02 ＋Ｒ 01 ）・ｉ Ｅｚ＝Ｒ 0 ・ｉ（ただし、Ｒ 0 は切換スイッチｆ、ｇ、ｈの選択に対応した抵抗 値）であるので、以下のようになる。 Ｅ0＝−（Ｅｂ＋Ｅｄ）＋（２Ｅｃ＋Ｅｚ） ＝−（Ｒｔ−Ｒ0）・ｉ Eb = (2r + Rt + R 03 + R 02 + R 01 ) · i Ec = (r + R 03 + R 02 + R 01 ) · i Ed = (R 03 + R 02 + R 01 ) · i Ez = R 0 · i (however, R 0 Is a resistance value corresponding to the selection of the changeover switches f, g, and h ), and is as follows. E 0 = - (Eb + Ed ) + (2Ec + Ez) = - (Rt-R 0) · i
【００１９】ここで、Ｒｔは測温抵抗体２の抵抗値、Ｒ
0は測温抵抗体２の０℃における抵抗値、ｉは定電流源
１の電流値である。Here, Rt is the resistance value of the resistance temperature detector 2, and Rt
0 is the resistance value of the resistance temperature detector 2 at 0 ° C., and i is the current value of the constant current source 1.
【００２０】例えば、測温抵抗体２として、５０Ωと１
００Ωの白金、５０８Ωのニッケルの全てに対応できる
ものとした場合について説明する。For example, as the resistance temperature detector 2, 50Ω and 1
A case will be described in which it is possible to handle all of platinum of 00Ω and nickel of 508Ω.
【００２１】基準抵抗Ｒ01、Ｒ02、Ｒ03は、それぞれ以
下のように設定する。 Ｒ01＝５０Ω Ｒ01＋Ｒ02＝１００Ω Ｒ01＋Ｒ02＋Ｒ03＝５０８ΩThe reference resistors R 01 , R 02 and R 03 are set as follows. R 01 = 50Ω R 01 + R 02 = 100Ω R 01 + R 02 + R 03 = 508Ω
【００２２】切換スイッチは、測温抵抗体２の定格に応
じて、白金５０Ωの場合にはｈを選択し、以下同様に白
金１００Ωの場合にはｇ、ニッケル５０８Ωの場合には
ｆを選択する。なお、切換スイッチｆ〜ｈの動作は、マ
ニュアルでもよいし、ＣＰＵ等により自動的に行っても
よい。The changeover switch selects h in the case of platinum 50Ω, g in the case of platinum 100Ω, and f in the case of nickel 508Ω according to the rating of the resistance temperature detector 2. . The operation of the changeover switches f to h may be performed manually or automatically by a CPU or the like.
【００２３】この発明の実施例１は、前述したように、
測温抵抗体２の各種定格品に対して、出力のダイナミッ
クレンジを大きくし、１つの製品で対応するために、複
数の基準抵抗Ｒ01、Ｒ02、Ｒ03を設け、測温抵抗体２の
種類に応じて、これを選択する。そして、測温抵抗体２
と選択された基準抵抗の各出力の差を演算増幅器３で演
算するので、切り換え用のスイッチのオン抵抗の影響を
受けることなく、測温抵抗体２の各種定格品に対応し
て、０℃において、出力を約０Ｖとでき、ダイナミック
レンジを大きくすることができ、ひいては高精度の温度
測定を行うことができるという効果を奏する。The first embodiment of the present invention, as described above,
A plurality of reference resistors R 01 , R 02 , and R 03 are provided in order to increase the output dynamic range and cope with one product with respect to various rated products of the resistance temperature detector 2. Select this according to the type of. And the resistance temperature detector 2
Since the difference between the respective outputs of the selected reference resistance and the selected reference resistance is calculated by the operational amplifier 3, it is not affected by the on resistance of the switch for switching, and corresponds to various rated products of the resistance temperature detector 2, In the above, there is an effect that the output can be set to about 0 V, the dynamic range can be widened, and further, highly accurate temperature measurement can be performed.
【００２４】実施例２．この発明の実施例２の構成を図
２を参照しながら説明する。図２は、この発明の実施例
２を示す回路図である。なお、点線内の回路は図１のも
のと全く同一である。Embodiment 2 FIG. The configuration of the second embodiment of the present invention will be described with reference to FIG. Second Embodiment FIG. 2 is a circuit diagram showing a second embodiment of the present invention. The circuit in the dotted line is exactly the same as that in FIG.
【００２５】図２において、４は演算増幅器、ｊ、ｋ、
ｍは切換スイッチ、Ｒ16、Ｒ17、Ｒ18、Ｒ19、Ｒ20、Ｒ
21、Ｒ22は抵抗である。In FIG. 2, 4 is an operational amplifier, j, k,
m is a changeover switch, R 16 , R 17 , R 18 , R 19 , R 20 , R
21 and R 22 are resistors.
【００２６】ところで、請求項２に係るこの発明の第１
の増幅手段は、前述したこの発明の実施例２では演算増
幅器３、抵抗Ｒ11、Ｒ12、Ｒ13、Ｒ14、Ｒ15から構成さ
れ、この発明の第２の増幅手段は、実施例２では演算増
幅器４、抵抗Ｒ16、Ｒ17、Ｒ18、Ｒ19、Ｒ20、Ｒ21、Ｒ
22から構成されている。By the way, the first aspect of the present invention according to claim 2
In the second embodiment of the present invention described above, the amplifying means is composed of the operational amplifier 3 and the resistors R 11 , R 12 , R 13 , R 14 and R 15 , and the second amplifying means of the present invention is the second embodiment. Then, the operational amplifier 4, the resistors R 16 , R 17 , R 18 , R 19 , R 20 , R 21 , and R.
It consists of 22 .
【００２７】つぎに、前述した実施例２の動作を説明す
る。図２の点線内の回路の動作は図１と同じである。測
温抵抗体２の定格抵抗値の大きさに応じて、演算増幅器
４の増幅度を切換スイッチｊ、ｋ、ｍにより切り換え
て、測温抵抗体２の定格抵抗値にかかわらず、出力電圧
Ｅ1がほぼ同じ大きさになるようにする。なお、切換ス
イッチｊ、ｋ、ｍの動作は、マニュアルでもよいし、Ｃ
ＰＵ等により自動的に行ってもよいことはもちろんであ
る。Next, the operation of the above-described second embodiment will be described. The operation of the circuit within the dotted line in FIG. 2 is the same as that in FIG. Depending on the magnitude of the rated resistance value of the resistance temperature detector 2, the amplification degree of the operational amplifier 4 is switched by the changeover switches j, k, and m to output the output voltage E regardless of the rated resistance value of the resistance temperature detector 2. Make 1 almost the same size. The operation of the changeover switches j, k, and m may be manual or C
Of course, it may be automatically performed by a PU or the like.
【００２８】すなわち、０℃で１００Ωの白金の場合、
温度０〜１００℃で１００〜１３９．２Ωであるので、
０〜７８．４ｍＶの出力が得られる。That is, in the case of 100 Ω platinum at 0 ° C.,
Since it is 100 to 139.2Ω at a temperature of 0 to 100 ° C,
An output of 0 to 78.4 mV is obtained.
【００２９】また、０℃で５０Ωの白金の場合、温度０
〜１００℃で５０〜６９．６Ωであるので、０〜３９．
２ｍＶの出力が得られる。In the case of 50 Ω platinum at 0 ° C., the temperature is 0
Since it is 50-69.6 Ω at -100 ° C, 0-39.
An output of 2 mV is obtained.
【００３０】このように、出力電圧が測温抵抗体２の定
格抵抗値によって異なると、この出力電圧をＡ／Ｄ変換
して使用する場合等、分解能が一定ではなく、どの測温
抵抗体でも一様に高精度で測定することができない。そ
こで、白金５０Ωの場合は、白金１００Ωより増幅度を
２倍にして、ほぼ同じ出力が得られるようにする。As described above, when the output voltage differs depending on the rated resistance value of the resistance temperature detector 2, the resolution is not constant when the output voltage is A / D converted and used, and any resistance temperature detector is used. It is impossible to measure uniformly with high accuracy. Therefore, in the case of 50 Ω platinum, the amplification factor is doubled compared to 100 Ω platinum so that almost the same output can be obtained.
【００３１】この発明の実施例２は、前述したように、
実施例１の回路に加えて、演算増幅器３の出力側に図２
に示す回路を設けたので、スイッチのオン抵抗の影響を
受けることなく、ダイナミックレンジを大きくでき、か
つ、測温抵抗体２の定格抵抗値に関係なく、出力電圧Ｅ
1をほぼ同一にでき、高精度の温度測定を行うことがで
きるという効果を奏する。The second embodiment of the present invention, as described above,
In addition to the circuit of the first embodiment, the output side of the operational amplifier 3 is shown in FIG.
Since the circuit shown in FIG. 2 is provided, the dynamic range can be increased without being affected by the on resistance of the switch, and the output voltage E can be obtained regardless of the rated resistance value of the resistance temperature detector 2.
1 can be made almost the same, and highly accurate temperature measurement can be performed.
【００３２】実施例３．この発明の実施例３の構成を図
３を参照しながら説明する。図３は、この発明の実施例
３を示す回路図である。なお、点線内の回路は図１のも
のと全く同一である。Embodiment 3 FIG. The configuration of the third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a circuit diagram showing a third embodiment of the present invention. The circuit in the dotted line is exactly the same as that in FIG.
【００３３】図３において、５は定電流源１を生成する
電源電圧Ｖｚと演算増幅器４の出力側に接続されたＡ／
Ｄ変換器である。他の構成は実施例２と同一である。In FIG. 3, 5 is a power supply voltage Vz for generating the constant current source 1 and A / A connected to the output side of the operational amplifier 4.
It is a D converter. Other configurations are the same as those in the second embodiment.
【００３４】通常、定電流源１の電流ｉが変動すると、
測定誤差が発生する。そこで、定電流源１を生成する電
源電圧Ｖｚ（ｉ∝Ｖｚ）もＡ／Ｄ変換して、出力Ｅ1と
Ｖｚにより、Ａ／Ｄ変換器５によってＥ1／Ｖｚの演算
を行うことにより、定電流源１の変動の影響を除去す
る。Normally, when the current i of the constant current source 1 fluctuates,
Measurement error occurs. Therefore, the power supply voltage Vz (i∝Vz) for generating the constant current source 1 is also A / D converted, and the output E 1 and Vz are used to calculate E 1 / Vz by the A / D converter 5. The influence of the fluctuation of the constant current source 1 is eliminated.
【００３５】この発明の実施例３は、前述したように、
実施例２の回路に加えて、演算増幅器４の出力側にＡ／
Ｄ変換器５を設けたので、スイッチのオン抵抗の影響を
受けることなく、ダイナミックレンジを大きくでき、測
温抵抗体２の定格抵抗値に関係なく、出力電圧Ｅ1をほ
ぼ同一にでき、高精度の温度測定を行うことができ、か
つ、定電流源１の変動による測定誤差をなくすことがで
きるという効果を奏する。The third embodiment of the present invention, as described above,
In addition to the circuit of the second embodiment, A / A is provided on the output side of the operational amplifier 4.
Since the D converter 5 is provided, the dynamic range can be increased without being affected by the ON resistance of the switch, and the output voltage E 1 can be made almost the same regardless of the rated resistance value of the resistance temperature detector 2. It is possible to perform accurate temperature measurement and eliminate a measurement error due to fluctuation of the constant current source 1.
【００３６】[0036]
【発明の効果】この発明の請求項１に係る多点温度測定
装置は、以上説明したとおり、一端に第１の端子を有し
他端に第２の端子及び第３の端子を有するとともに定格
抵抗値として０℃において第１の抵抗値を持つ第１の測
温抵抗体と、一端に第１の端子を有し他端に第２の端子
及び第３の端子を有するとともに定格抵抗値として０℃
において第２の抵抗値を持つ第２の測温抵抗体とを切換
スイッチにより切り換えて温度を測定する多点温度測定
装置において、前記切換スイッチを介して前記第１及び
第２の測温抵抗体の第１の端子に接続された定電流源
と、共通接続された前記第１及び第２の測温抵抗体の第
２の端子と回路アースとの間に接続され前記第１の抵抗
値を持つ第１の基準抵抗と、共通接続された前記第１及
び第２の測温抵抗体の第２の端子と回路アースとの間に
接続され前記第２の抵抗値を持つ第２の基準抵抗と、使
用する前記第１及び第２の測温抵抗体の定格抵抗値に応
じて前記第１又は第２の基準抵抗を選択する選択手段
と、前記第２の端子から供給される出力電圧、前記切換
スイッチを介して前記第１の端子から供給される出力電
圧及び前記第３の端子から供給される出力電圧、並びに
前記選択手段から供給される基準電圧に基づいて測定温
度に応じた出力電圧を得る増幅手段とを備えたので、ダ
イナミックレンジを大きくとれ、高精度の温度測定を可
能とすることができるという効果を奏する。As described above, the multipoint temperature measuring device according to claim 1 of the present invention has the first terminal at one end.
Has a second terminal and a third terminal at the other end and is rated
The first measurement that has the first resistance value at 0 ° C as the resistance value.
A temperature resistor and a first terminal at one end and a second terminal at the other end
And has a third terminal and has a rated resistance value of 0 ° C.
Switch to the second resistance temperature detector having the second resistance value at
Multi-point temperature measurement by switching the temperature with a switch
In the device, the first and
A constant current source connected to the first terminal of the second resistance temperature detector
And the first and second resistance temperature detectors connected in common
The first resistor connected between the second terminal and the circuit ground.
A first reference resistor having a value and the first and second resistors commonly connected
And between the second terminal of the second RTD and the circuit ground.
A second reference resistor connected and having the second resistance value,
Depending on the rated resistance value of the first and second resistance temperature detectors used
Selecting means for selecting the first or second reference resistance
And an output voltage supplied from the second terminal, the switching
Output power supplied from the first terminal via a switch
Pressure and an output voltage supplied from the third terminal, and
Measured temperature based on the reference voltage supplied from the selection means
Since it is provided with an amplifying means for obtaining an output voltage according to the temperature, it is possible to obtain a large dynamic range and to enable highly accurate temperature measurement.
【００３７】この発明の請求項２に係る多点温度測定装
置は、以上説明したとおり、一端に第１の端子を有し他
端に第２の端子及び第３の端子を有するとともに定格抵
抗値として０℃において第１の抵抗値を持つ第１の測温
抵抗体と、一端に第１の端子を有し他端に第２の端子及
び第３の端子を有するとともに定格抵抗値として０℃に
おいて第２の抵抗値を持つ第２の測温抵抗体とを切換ス
イッチにより切り換えて温度を測定する多点温度測定装
置において、前記切換スイッチを介して前記第１及び第
２の測温抵抗体の第１の端子に接続された定電流源と、
共通接続された前記第１及び第２の測温抵抗体の第２の
端子と回路アースとの間に接続され前記第１の抵抗値を
持つ第１の基準抵抗と、共通接続された前記第１及び第
２の測温抵抗体の第２の端子と回路アースとの間に接続
され前記第２の抵抗値を持つ第２の基準抵抗と、使用す
る前記第１及び第２の測温抵抗体の定格抵抗値に応じて
前記第１又は第２の基準抵抗を選択する第１の選択手段
と、前記第２の端子から供給される出力電圧、前記切換
スイッチを介して前記第１の端子から供給される出力電
圧及び前記第３の端子から供給される出力電圧、並びに
前記選択手段から供給される基準電圧に基づいて測定温
度に応じた出力電圧を得る第１の増幅手段と、前記第１
の増幅手段の出力電圧を所定の増幅度で増幅する第２の
増幅手段と、前記第２の増幅手段の増幅度を使用する前
記第１及び第２の測温抵抗体の定格抵抗値に応じて選択
する第２の選択手段とを備えたので、ダイナミックレン
ジを大きくとれ、かつ測温抵抗体の定格抵抗値に関係な
く、出力電圧をほぼ同一にでき、高精度の温度測定を行
うことができるという効果を奏する。As described above, the multipoint temperature measuring device according to claim 2 of the present invention has the first terminal at one end and the other end.
It has a second terminal and a third terminal at the end and
First temperature measurement with a first resistance value at 0 ° C as a resistance value
A resistor and a first terminal at one end and a second terminal at the other end
And a third terminal, and a rated resistance value of 0 ° C
Switch between the second resistance temperature detector having the second resistance value.
Multi-point temperature measurement device that switches temperature by switch
The first switch and the first switch via the changeover switch.
A constant current source connected to the first terminal of the resistance temperature detector of 2;
The second of the first and second resistance temperature detectors connected in common
Is connected between the terminal and the circuit ground, and has the first resistance value.
The first reference resistor and the first and the first resistor commonly connected
Connected between the 2nd terminal of RTD 2 and the circuit ground
And a second reference resistor having the second resistance value,
According to the rated resistance value of the first and second resistance temperature detectors
First selecting means for selecting the first or second reference resistance
And an output voltage supplied from the second terminal, the switching
Output power supplied from the first terminal via a switch
Pressure and an output voltage supplied from the third terminal, and
Measured temperature based on the reference voltage supplied from the selection means
A first amplifying means for obtaining an output voltage according to the frequency;
For amplifying the output voltage of the amplifying means of
Before using the amplification means and the amplification degree of the second amplification means
Select according to the rated resistance value of the first and second resistance thermometer
Since the second selection means is provided, the dynamic range can be widened, and the output voltage can be substantially the same regardless of the rated resistance value of the resistance temperature detector, and highly accurate temperature measurement can be performed. Produce an effect.
【００３８】この発明の請求項３に係る多点温度測定装
置は、以上説明したとおり、一端に第１の端子を有し他
端に第２の端子及び第３の端子を有するとともに定格抵
抗値として０℃において第１の抵抗値を持つ第１の測温
抵抗体と、一端に第１の端子を有し他端に第２の端子及
び第３の端子を有するとともに定格抵抗値として０℃に
おいて第２の抵抗値を持つ第２の測温抵抗体とを切換ス
イッチにより切り換えて温度を測定する多点温度測定装
置において、前記切換スイッチを介して前記第１及び第
２の測温抵抗体の第１の端子に接続された定電流源と、
共通接続された前記第１及び第２の測温抵抗体の第２の
端子と回路アースとの間に接続され前記第１の抵抗値を
持つ第１の基準抵抗と、共通接続された前記第１及び第
２の測温抵抗体の第２の端子と回路アースとの間に接続
され前記第２の抵抗値を持つ第２の基準抵抗と、使用す
る前記第１及び第２の測温抵抗体の定格抵抗値に応じて
前記第１又は第２の基準抵抗を選択する第１の選択手段
と、前記第２の端子から供給される出力電圧、前記切換
スイッチを介して前記第１の端子から供給される出力電
圧及び前記第３の端子から供給される出力電圧、並びに
前記選択手段から供給される基準電圧に基づいて測定温
度に応じた出力電圧を得る第１の増幅手段と、前記第１
の増幅手段の出力電圧を所定の増幅度で増幅する第２の
増幅手段と、前記第２の増幅手段の増幅度を使用する前
記第１及び第２の測温抵抗体の定格抵抗値に応じて選択
する第２の選択手段と、前記第１及び第２の測温抵抗体
に電流を供給するための前記定電流源を生成する電源電
圧Ｖｚ及び前記第２の増幅手段の出力電圧Ｅ１に基づい
てＥ１／Ｖｚの演算を行うＡ／Ｄ変換器とを備えたの
で、ダイナミックレンジを大きくとれ、高精度の温度測
定を可能とすることができ、かつ定電流源の変動による
測定誤差をなくすことができるという効果を奏する。As described above, the multipoint temperature measuring device according to claim 3 of the present invention has the first terminal at one end and the other end.
It has a second terminal and a third terminal at the end and
First temperature measurement with a first resistance value at 0 ° C as a resistance value
A resistor and a first terminal at one end and a second terminal at the other end
And a third terminal, and a rated resistance value of 0 ° C
Switch between the second resistance temperature detector having the second resistance value.
Multi-point temperature measurement device that switches temperature by switch
The first switch and the first switch via the changeover switch.
A constant current source connected to the first terminal of the resistance temperature detector of 2;
The second of the first and second resistance temperature detectors connected in common
Is connected between the terminal and the circuit ground, and has the first resistance value.
The first reference resistor and the first and the first resistor commonly connected
Connected between the 2nd terminal of RTD 2 and the circuit ground
And a second reference resistor having the second resistance value,
According to the rated resistance value of the first and second resistance temperature detectors
First selecting means for selecting the first or second reference resistance
And an output voltage supplied from the second terminal, the switching
Output power supplied from the first terminal via a switch
Pressure and an output voltage supplied from the third terminal, and
Measured temperature based on the reference voltage supplied from the selection means
A first amplifying means for obtaining an output voltage according to the frequency;
For amplifying the output voltage of the amplifying means of
Before using the amplification means and the amplification degree of the second amplification means
Select according to the rated resistance value of the first and second resistance thermometer
Second selecting means, and the first and second resistance temperature detectors
Power source for generating the constant current source for supplying current to the
Based on the voltage Vz and the output voltage E1 of the second amplifying means
Equipped with an A / D converter for calculating E1 / Vz, it is possible to obtain a large dynamic range, enable highly accurate temperature measurement, and eliminate measurement errors due to fluctuations in the constant current source. There is an effect that can be.
【図１】この発明の実施例１を示す回路図である。FIG. 1 is a circuit diagram showing a first embodiment of the present invention.
【図２】この発明の実施例２を示す回路図である。FIG. 2 is a circuit diagram showing Embodiment 2 of the present invention.
【図３】この発明の実施例３を示す回路図である。FIG. 3 is a circuit diagram showing a third embodiment of the present invention.
１ 定電流源 ２ 測温抵抗体 ３ 演算増幅器 ４ 演算増幅器 ５ Ａ／Ｄ変換器 1 constant current source 2 resistance temperature detector 3 operational amplifier 4 operational amplifier 5 A / D converter
Claims (3)
子及び第３の端子を有するとともに定格抵抗値として０
℃において第１の抵抗値を持つ第１の測温抵抗体と、一
端に第１の端子を有し他端に第２の端子及び第３の端子
を有するとともに定格抵抗値として０℃において第２の
抵抗値を持つ第２の測温抵抗体とを切換スイッチにより
切り換えて温度を測定する多点温度測定装置において、前記切換スイッチを介して前記第１及び第２の測温抵抗
体の第１の端子に接続された定電流源と、 共通接続された前記第１及び第２の測温抵抗体の第２の
端子と回路アースとの間に接続され前記第１の抵抗値を
持つ第１の基準抵抗と、 共通接続された前記第１及び第２の測温抵抗体の第２の
端子と回路アースとの間に接続され前記第２の抵抗値を
持つ第２の基準抵抗と、 使用する前記第１及び第２の測温抵抗体の定格抵抗値に
応じて前記第１又は第２の基準抵抗を選択する選択手段
と、 前記第２の端子から供給される出力電圧、前記切換スイ
ッチを介して前記第１の端子から供給される出力電圧及
び前記第３の端子から供給される出力電圧、並びに前記
選択手段から供給される基準電圧に基づいて測定温度に
応じた出力電圧を得る増幅手段と を備えたことを特徴と
する多点温度測定装置。 1. A first terminal at one end and a second end at the other end.
It has a child and a third terminal and has a rated resistance value of 0.
A first resistance temperature detector having a first resistance value at ℃,
A first terminal at one end and a second terminal and a third terminal at the other end
And has a second rated resistance at 0 ° C.
In a multipoint temperature measuring device for measuring a temperature by switching a second resistance temperature detector having a resistance value with a changeover switch, the first and second temperature measurement resistances are changed through the changeover switch.
A constant current source connected to the first terminal of the body, and a second of the first and second resistance temperature detectors commonly connected
Is connected between the terminal and the circuit ground, and has the first resistance value.
The first reference resistance and the second resistance of the first and second resistance temperature detectors commonly connected
Is connected between the terminal and the circuit ground and has the second resistance value
The second reference resistance to hold and the rated resistance value of the first and second resistance temperature detectors to be used
Selecting means for selecting the first or second reference resistance in accordance with
And the output voltage supplied from the second terminal, the switching switch
Output voltage supplied from the first terminal through the switch and
And the output voltage supplied from the third terminal, and
Based on the reference voltage supplied from the selection means
A multipoint temperature measuring device comprising: an amplifying unit that obtains a corresponding output voltage .
子及び第３の端子を有するとともに定格抵抗値として０
℃において第１の抵抗値を持つ第１の測温抵抗体と、一
端に第１の端子を有し他端に第２の端子及び第３の端子
を有するとともに定格抵抗値として０℃において第２の
抵抗値を持つ第２の測温抵抗体とを切換スイッチにより
切り換えて温度を測定する多点温度測定装置において、前記切換スイッチを介して前記第１及び第２の測温抵抗
体の第１の端子に接続された定電流源と、 共通接続された前記第１及び第２の測温抵抗体の第２の
端子と回路アースとの間に接続され前記第１の抵抗値を
持つ第１の基準抵抗と、 共通接続された前記第１及び第２の測温抵抗体の第２の
端子と回路アースとの 間に接続され前記第２の抵抗値を
持つ第２の基準抵抗と、 使用する前記第１及び第２の測温抵抗体の定格抵抗値に
応じて前記第１又は第２の基準抵抗を選択する第１の選
択手段と、 前記第２の端子から供給される出力電圧、前記切換スイ
ッチを介して前記第１の端子から供給される出力電圧及
び前記第３の端子から供給される出力電圧、並びに前記
選択手段から供給される基準電圧に基づいて測定温度に
応じた出力電圧を得る第１の増幅手段と、 前記第１の増幅手段の出力電圧を所定の増幅度で増幅す
る第２の増幅手段と、 前記第２の増幅手段の増幅度を使用する前記第１及び第
２の測温抵抗体の定格抵抗値に応じて選択する第２の選
択手段と を備えたことを特徴とする多点温度測定装置。2. A first terminal at one end and a second end at the other end.
It has a child and a third terminal and has a rated resistance value of 0.
A first resistance temperature detector having a first resistance value at ℃,
A first terminal at one end and a second terminal and a third terminal at the other end
And has a second rated resistance at 0 ° C.
In a multipoint temperature measuring device for measuring a temperature by switching a second resistance temperature detector having a resistance value with a changeover switch, the first and second temperature measurement resistances are changed through the changeover switch.
A constant current source connected to the first terminal of the body, and a second of the first and second resistance temperature detectors commonly connected
Is connected between the terminal and the circuit ground, and has the first resistance value.
The first reference resistance and the second resistance of the first and second resistance temperature detectors commonly connected
Is connected between the terminal and the circuit ground and has the second resistance value
The second reference resistance to hold and the rated resistance value of the first and second resistance temperature detectors to be used
According to the first selection, the first or second reference resistance is selected.
Selecting means, the output voltage supplied from the second terminal, and the switching switch.
Output voltage supplied from the first terminal through the switch and
And the output voltage supplied from the third terminal, and
Based on the reference voltage supplied from the selection means
First amplifying means for obtaining a corresponding output voltage, and amplifying the output voltage of the first amplifying means with a predetermined amplification degree
Second amplifying means, and the first and the second amplifying means using the amplification degree of the second amplifying means.
The second selection to be selected according to the rated resistance value of the RTD
Multi-point temperature measuring apparatus being characterized in that a-option means.
子及び第３の端子を有するとともに定格抵抗値として０
℃において第１の抵抗値を持つ第１の測温抵抗体と、一
端に第１の端子を有し他端に第２の端子及び第３の端子
を有するとともに定格抵抗値として０℃において第２の
抵抗値を持つ第２の測温抵抗体とを切換スイッチにより
切り換えて温度を測定する多点温度測定装置において、前記切換スイッチを介して前記第１及び第２の測温抵抗
体の第１の端子に接続された定電流源と、 共通接続された前記第１及び第２の測温抵抗体の第２の
端子と回路アースとの間に接続され前記第１の抵抗値を
持つ第１の基準抵抗と、 共通接続された前記第１及び第２の測温抵抗体の第２の
端子と回路アースとの間に接続され前記第２の抵抗値を
持つ第２の基準抵抗と、 使用する前記第１及び第２の測温抵抗体の定格抵抗値に
応じて前記第１又は第２の基準抵抗を選択する第１の選
択手段と、 前記第２の端子から供給される出力電圧、前記切換スイ
ッチを介して前記第１の端子から供給される出力電圧及
び前記第３の端子から供給される出力電圧、並びに前記
選択手段から供給される基準電圧に基づいて測定温度に
応じた出力電圧を得る第１の増幅手段と、 前記第１の増幅手段の出力電圧を所定の増幅度で増幅す
る第２の増幅手段と、 前記第２の増幅手段の増幅度を使用する前記第１及び第
２の測温抵抗体の定格抵抗値に応じて選択する第２の選
択手段と、 前記第１及び第２の測温抵抗体に電流を供給するための
前記定電流源を生成する電源電圧Ｖｚ及び前記第２の増
幅手段の出力電圧Ｅ１に基づいてＥ１／Ｖｚの演算を行
うＡ／Ｄ変換器と を備えたことを特徴とする多点温度測
定装置。3. A first terminal at one end and a second end at the other end.
It has a child and a third terminal and has a rated resistance value of 0.
A first resistance temperature detector having a first resistance value at ℃,
A first terminal at one end and a second terminal and a third terminal at the other end
And has a second rated resistance at 0 ° C.
In a multipoint temperature measuring device for measuring a temperature by switching a second resistance temperature detector having a resistance value with a changeover switch, the first and second temperature measurement resistances are changed through the changeover switch.
A constant current source connected to the first terminal of the body, and a second of the first and second resistance temperature detectors commonly connected
Is connected between the terminal and the circuit ground, and has the first resistance value.
The first reference resistance and the second resistance of the first and second resistance temperature detectors commonly connected
Is connected between the terminal and the circuit ground and has the second resistance value
The second reference resistance to hold and the rated resistance value of the first and second resistance temperature detectors to be used
According to the first selection, the first or second reference resistance is selected.
Selecting means, the output voltage supplied from the second terminal, and the switching switch.
Output voltage supplied from the first terminal through the switch and
And the output voltage supplied from the third terminal, and
Based on the reference voltage supplied from the selection means
First amplifying means for obtaining a corresponding output voltage, and amplifying the output voltage of the first amplifying means with a predetermined amplification degree
Second amplifying means, and the first and the second amplifying means using the amplification degree of the second amplifying means.
The second selection to be selected according to the rated resistance value of the RTD
Selecting means and means for supplying an electric current to the first and second resistance temperature detectors.
The power supply voltage Vz for generating the constant current source and the second increase voltage
E1 / Vz is calculated based on the output voltage E1 of the width means.
A multipoint temperature measuring device comprising an A / D converter .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3303362A JP2675467B2 (en) | 1991-11-19 | 1991-11-19 | Multi-point temperature measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3303362A JP2675467B2 (en) | 1991-11-19 | 1991-11-19 | Multi-point temperature measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05142061A JPH05142061A (en) | 1993-06-08 |
| JP2675467B2 true JP2675467B2 (en) | 1997-11-12 |
Family
ID=17920077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3303362A Expired - Fee Related JP2675467B2 (en) | 1991-11-19 | 1991-11-19 | Multi-point temperature measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2675467B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101662354B1 (en) * | 2012-10-05 | 2016-10-04 | 엘에스산전 주식회사 | Apparatus for Multi Channel Resistance Measurement using Constant Current Source |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH076850B2 (en) * | 1987-06-04 | 1995-01-30 | 横河電機株式会社 | Temperature measurement circuit |
| JPH0241546U (en) * | 1988-09-10 | 1990-03-22 |
-
1991
- 1991-11-19 JP JP3303362A patent/JP2675467B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05142061A (en) | 1993-06-08 |
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