JPH0372368U - - Google Patents
Info
- Publication number
- JPH0372368U JPH0372368U JP13505789U JP13505789U JPH0372368U JP H0372368 U JPH0372368 U JP H0372368U JP 13505789 U JP13505789 U JP 13505789U JP 13505789 U JP13505789 U JP 13505789U JP H0372368 U JPH0372368 U JP H0372368U
- Authority
- JP
- Japan
- Prior art keywords
- input
- operational amplifier
- conductivity measurement
- signal
- oscillator
- 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
- 238000005259 measurement Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
第１図及び第２図は、本考案に係る導電率測定
検出回路の第１実施例及び第２実施例を示し、第
１図、第２図共に、導電率測定検出回路の要部を
示す回路図である。第３図は、従来の導電率測定
検出回路の基本回路図である。
１……印加入力用発振器、２……信号入力用演
算増幅器、３……導電率測定セル電極、４，５…
…演算増幅器、ＳＷ１，ＳＷ２，ＳＷ３，ＳＷ１
′，ＳＷ２′，ＳＷ３′……アナログスイツチ、
ｒ１，ｒ２，ｒ３……ゲイン抵抗。
1 and 2 show a first embodiment and a second embodiment of a conductivity measurement and detection circuit according to the present invention, and both FIGS. 1 and 2 show the main parts of the conductivity measurement and detection circuit. It is a circuit diagram. FIG. 3 is a basic circuit diagram of a conventional conductivity measurement detection circuit. DESCRIPTION OF SYMBOLS 1... Oscillator for application input, 2... Operational amplifier for signal input, 3... Conductivity measurement cell electrode, 4, 5...
...Operation amplifier, SW1, SW2, SW3, SW1
', SW2', SW3'...Analog switch,
r 1 , r 2 , r 3 ...gain resistance.
Claims (1)
印加入力用発振器が接続され、他方の入力端子に
導電率測定セルの一方の電極が接続され、前記信
号入力用演算増幅器において前記印加入力用発振
器からの入力信号を増幅するようにした導電率測
定検出回路において、前記信号入力用演算増幅器
の帰還部に、演算増幅器と汎用アナログスイツチ
とゲイン抵抗とを直列に接続した複数の回路に互
いに並列的に設けたことを特徴とする導電率測定
検出回路。 (2) 信号入力用演算増幅器の一方の入力端子に
印加入力用発振器が接続され、他方の入力端子に
導電率測定セルの一方の電極が接続され、前記信
号入力用演算増幅器において前記印加入力用発振
器からの入力信号を増幅するようにした導電率測
定検出回路において、前記信号入力用演算増幅器
の帰還部に１つの演算増幅器を設け、この演算増
幅器の出力部に、汎用アナログスイツチとゲイン
抵抗とを直列に接続した複数の回路を互いに並列
的に設けると共に、前記演算増幅器の一方の入力
端子と前記各汎用アナログスイツチとゲイン抵抗
との間とをアナログスイツチを介して接続したこ
とを特徴とする導電率測定検出回路。[Claims for Utility Model Registration] (1) An oscillator for input input is connected to one input terminal of an operational amplifier for signal input, and one electrode of a conductivity measurement cell is connected to the other input terminal, and the signal input In the conductivity measurement detection circuit for amplifying the input signal from the input oscillator in the operational amplifier for signal input, an operational amplifier, a general-purpose analog switch, and a gain resistor are connected in series to the feedback section of the operational amplifier for signal input. A conductivity measurement detection circuit characterized in that a plurality of connected circuits are provided in parallel with each other. (2) An oscillator for input input is connected to one input terminal of the operational amplifier for signal input, and one electrode of a conductivity measurement cell is connected to the other input terminal, and the operational amplifier for signal input has an oscillator for input input. In a conductivity measurement detection circuit configured to amplify an input signal from an oscillator, one operational amplifier is provided in the feedback section of the signal input operational amplifier, and a general-purpose analog switch and a gain resistor are connected to the output section of this operational amplifier. A plurality of circuits connected in series are provided in parallel to each other, and one input terminal of the operational amplifier, each of the general-purpose analog switches, and the gain resistor are connected via an analog switch. Conductivity measurement detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13505789U JPH0749423Y2 (en) | 1989-11-20 | 1989-11-20 | Conductivity measurement detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13505789U JPH0749423Y2 (en) | 1989-11-20 | 1989-11-20 | Conductivity measurement detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0372368U true JPH0372368U (en) | 1991-07-22 |
| JPH0749423Y2 JPH0749423Y2 (en) | 1995-11-13 |
Family
ID=31682348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13505789U Expired - Fee Related JPH0749423Y2 (en) | 1989-11-20 | 1989-11-20 | Conductivity measurement detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0749423Y2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06137193A (en) * | 1992-10-23 | 1994-05-17 | Nippondenso Co Ltd | Air-fuel ratio control device for internal combustion engine |
| JP2006017679A (en) * | 2004-07-05 | 2006-01-19 | Toshiba Corp | Ultrasonic flow meter |
| JP2012220399A (en) * | 2011-04-12 | 2012-11-12 | Hioki Ee Corp | Four-terminal type measuring apparatus |
| WO2017221714A1 (en) * | 2016-06-21 | 2017-12-28 | ソニー株式会社 | Semiconductor device and cellular potential measurement device |
| WO2019008743A1 (en) * | 2017-07-07 | 2019-01-10 | 株式会社島津製作所 | Electrical conductivity detector and method for determining phase adjustment value |
| CN114965592A (en) * | 2022-06-29 | 2022-08-30 | 中天海洋系统有限公司 | Conductivity measuring circuit |
-
1989
- 1989-11-20 JP JP13505789U patent/JPH0749423Y2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06137193A (en) * | 1992-10-23 | 1994-05-17 | Nippondenso Co Ltd | Air-fuel ratio control device for internal combustion engine |
| JP2006017679A (en) * | 2004-07-05 | 2006-01-19 | Toshiba Corp | Ultrasonic flow meter |
| JP2012220399A (en) * | 2011-04-12 | 2012-11-12 | Hioki Ee Corp | Four-terminal type measuring apparatus |
| WO2017221714A1 (en) * | 2016-06-21 | 2017-12-28 | ソニー株式会社 | Semiconductor device and cellular potential measurement device |
| JPWO2017221714A1 (en) * | 2016-06-21 | 2019-04-11 | ソニー株式会社 | Semiconductor device and cell potential measuring device |
| US10866211B2 (en) | 2016-06-21 | 2020-12-15 | Sony Corporation | Semiconductor device and cell potential measuring apparatus |
| WO2019008743A1 (en) * | 2017-07-07 | 2019-01-10 | 株式会社島津製作所 | Electrical conductivity detector and method for determining phase adjustment value |
| US11022587B2 (en) | 2017-07-07 | 2021-06-01 | Shimadzu Corporation | Electric conductivity detector and method for determining phase adjustment value |
| CN114965592A (en) * | 2022-06-29 | 2022-08-30 | 中天海洋系统有限公司 | Conductivity measuring circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0749423Y2 (en) | 1995-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |