JPS55117969A - Surface potentiometer - Google Patents

Surface potentiometer

Info

Publication number
JPS55117969A
JPS55117969A JP2510179A JP2510179A JPS55117969A JP S55117969 A JPS55117969 A JP S55117969A JP 2510179 A JP2510179 A JP 2510179A JP 2510179 A JP2510179 A JP 2510179A JP S55117969 A JPS55117969 A JP S55117969A
Authority
JP
Japan
Prior art keywords
input
current
terminal
guard electrode
operational amplifier
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
JP2510179A
Other languages
Japanese (ja)
Inventor
Tadahiro Eda
Susumu Tatsumi
Tsutomu Imai
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP2510179A priority Critical patent/JPS55117969A/en
Priority to US06/082,844 priority patent/US4330749A/en
Priority to DE19792951814 priority patent/DE2951814A1/en
Publication of JPS55117969A publication Critical patent/JPS55117969A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent an equivalent input current from being increased and neutralize the input current to prevent lowering of the detection precision, by utilizing the off-set voltage generated in the output voltage to apply a correction voltage to the guard electrode surrounding a potential detection electrode.
CONSTITUTION: The + input terminal of operational amplifier 7 constituting potential detection amplifier 6 is connected to not only the output terminal directly but also guard electrode 8 surrounding the input detection electrode to keep the potential of guard electrode 8 at output voltage V2. Variable resistance R5 is connected to the terminal for off-set voltage adjustment provided in operational amplifier 7. Output voltage V2 is applied from the output terminal of operational amplifier 7 constituting potential detection amplifier 6 to the - input terminal and guard electrode 8, and current IB' is flowed through insulating resistance R1 and differential input impedance R2 to neutralize input bias current IB, thus correcting input bias current IB.
COPYRIGHT: (C)1980,JPO&Japio
JP2510179A 1978-12-25 1979-03-06 Surface potentiometer Pending JPS55117969A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2510179A JPS55117969A (en) 1979-03-06 1979-03-06 Surface potentiometer
US06/082,844 US4330749A (en) 1978-12-25 1979-10-09 Electrometer apparatus
DE19792951814 DE2951814A1 (en) 1978-12-25 1979-12-21 ELECTROMETER DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2510179A JPS55117969A (en) 1979-03-06 1979-03-06 Surface potentiometer

Publications (1)

Publication Number Publication Date
JPS55117969A true JPS55117969A (en) 1980-09-10

Family

ID=12156525

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2510179A Pending JPS55117969A (en) 1978-12-25 1979-03-06 Surface potentiometer

Country Status (1)

Country Link
JP (1) JPS55117969A (en)

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