JPS54134684A - Card circuit of electrostatic capacity measuring apparatus - Google Patents
Card circuit of electrostatic capacity measuring apparatusInfo
- Publication number
- JPS54134684A JPS54134684A JP9260378A JP9260378A JPS54134684A JP S54134684 A JPS54134684 A JP S54134684A JP 9260378 A JP9260378 A JP 9260378A JP 9260378 A JP9260378 A JP 9260378A JP S54134684 A JPS54134684 A JP S54134684A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- impedance
- measured
- terminals
- sample
- 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
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
PURPOSE: To improve the accuracy of measurement by connecting the low voltage side terminal of the sample to be measured to the input of the amplifier of an amplification factor 1 of large input impedance and small output impedance.
CONSTITUTION: As the output terminals of an amplifier A are connected between the impedance terminals 1, 2 to be measured, the respective other terminals of C13, C23 are commonly connected and are connected to the output terminals of the amplifier A. The amplifier A is an amplifier for performing impedance conversion, for which the one of +1 in gain and of large input impedance and small output impedanc is used. As a result, the current having flowed through the sample to be measured completely flows to the amplifiers A1, A2 and no current other than this flows in A1, A2. Because of this, only the current flowing in the impedance Cx, Rx to be measured flows in the measurement circuit following the operational amplifiers A1, A2 and the measurement excluding the effect of the impedanceof the sample to be measured to ground may be performed.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9260378A JPS54134684A (en) | 1978-07-31 | 1978-07-31 | Card circuit of electrostatic capacity measuring apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9260378A JPS54134684A (en) | 1978-07-31 | 1978-07-31 | Card circuit of electrostatic capacity measuring apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54134684A true JPS54134684A (en) | 1979-10-19 |
Family
ID=14059017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9260378A Pending JPS54134684A (en) | 1978-07-31 | 1978-07-31 | Card circuit of electrostatic capacity measuring apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54134684A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57136171A (en) * | 1981-02-17 | 1982-08-23 | Yokogawa Hokushin Electric Corp | Simultaneous measuring device for conductivity and permitivity |
-
1978
- 1978-07-31 JP JP9260378A patent/JPS54134684A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57136171A (en) * | 1981-02-17 | 1982-08-23 | Yokogawa Hokushin Electric Corp | Simultaneous measuring device for conductivity and permitivity |
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