JPS5672355A - Automatic compensation system for conductivity meter - Google Patents
Automatic compensation system for conductivity meterInfo
- Publication number
- JPS5672355A JPS5672355A JP14763179A JP14763179A JPS5672355A JP S5672355 A JPS5672355 A JP S5672355A JP 14763179 A JP14763179 A JP 14763179A JP 14763179 A JP14763179 A JP 14763179A JP S5672355 A JPS5672355 A JP S5672355A
- Authority
- JP
- Japan
- Prior art keywords
- output
- voltage
- electrode
- variable gain
- fed
- 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
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
PURPOSE: To automatically compensate the measuring error, by adding the component according to compensation current with the output of electrode via a variable gain circuit so that they are cancelled each other and controlling the variable gain circuit with the output detected for the phase difference between measured output and the voltage fed to the electrode.
CONSTITUTION: An AC voltage is fed to meaure electrode E with an oscillator OSC and the current flowing to the elctrode E is given to the inverting input of a differential amplifier A2 via an amplifier A1. On the other hand, the AC voltage is fed also to a capacitor C1 to produce the compensation current different from the phase by the AC voltage by 90°, and the compensation current is given to a noninverting input of the differential amplifier A2 via a variable gain circuit VGA. The output of the differential amplifier A2 is given to the indica tor M as the measured output. The measured output and the voltage fed to the electrode E are detected for the phase difference at the phase comparator PC and this detected output is used for the gain control of the variable gain circuit VGA via an amplifier A3.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14763179A JPS5672355A (en) | 1979-11-16 | 1979-11-16 | Automatic compensation system for conductivity meter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14763179A JPS5672355A (en) | 1979-11-16 | 1979-11-16 | Automatic compensation system for conductivity meter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5672355A true JPS5672355A (en) | 1981-06-16 |
JPS6360344B2 JPS6360344B2 (en) | 1988-11-24 |
Family
ID=15434689
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14763179A Granted JPS5672355A (en) | 1979-11-16 | 1979-11-16 | Automatic compensation system for conductivity meter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5672355A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007271363A (en) * | 2006-03-30 | 2007-10-18 | Fujitsu Ltd | Ferroelectric substance characteristic measuring instrument |
-
1979
- 1979-11-16 JP JP14763179A patent/JPS5672355A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007271363A (en) * | 2006-03-30 | 2007-10-18 | Fujitsu Ltd | Ferroelectric substance characteristic measuring instrument |
Also Published As
Publication number | Publication date |
---|---|
JPS6360344B2 (en) | 1988-11-24 |
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