JPS54134684A - Card circuit of electrostatic capacity measuring apparatus - Google Patents

Card circuit of electrostatic capacity measuring apparatus

Info

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
Application number
JP9260378A
Other languages
Japanese (ja)
Inventor
Hisao Nakane
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Hokushin Electric Corp
Priority to JP9260378A priority Critical patent/JPS54134684A/en
Publication of JPS54134684A publication Critical patent/JPS54134684A/en
Pending legal-status Critical Current

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
JP9260378A 1978-07-31 1978-07-31 Card circuit of electrostatic capacity measuring apparatus Pending JPS54134684A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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