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JPS5679959A - Probe of noncontact alternating current type electrometer - Google Patents
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JPS5679959A - Probe of noncontact alternating current type electrometer - Google Patents

Probe of noncontact alternating current type electrometer

Info

Publication number
JPS5679959A
JPS5679959A JP15828379A JP15828379A JPS5679959A JP S5679959 A JPS5679959 A JP S5679959A JP 15828379 A JP15828379 A JP 15828379A JP 15828379 A JP15828379 A JP 15828379A JP S5679959 A JPS5679959 A JP S5679959A
Authority
JP
Japan
Prior art keywords
casing
potential
alternating current
same level
noncontact
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
Application number
JP15828379A
Other languages
Japanese (ja)
Other versions
JPS6351270B2 (en
Inventor
Minoru Aoki
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 JP15828379A priority Critical patent/JPS5679959A/en
Publication of JPS5679959A publication Critical patent/JPS5679959A/en
Publication of JPS6351270B2 publication Critical patent/JPS6351270B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Measurement Of Current Or Voltage (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

PURPOSE: To prevent the decrease in the impedance of floating capacity and the decrease in sensitivity by changing the potential of a casing at the same phase and same level as those of the potential fluctuations of a detecting electrode.
CONSTITUTION: A bootstrap circuit is constituted of a circuit including a capacitor C1. The output of an operational amplifier OPA which is making the operation of a noninverting amplifier of approximately 1 in gain at a high input impedance is being applied to a casing 2 via a capacitor CN1 and the potential of the casing 2 fluctuates in an alternating current manner at approximately the same level as that of the output of the operational amplifier OPA. Hence, the potentials of the field modulator 5 and electrostatic shield 6 connected in a DC manner to the casing 2 also fluctuate at the same phase and same level as those of the input of the noninversion input terminal of the amplifier OPA, that is, the potential fluctuations of a detecting electrode 4.
COPYRIGHT: (C)1981,JPO&Japio
JP15828379A 1979-12-05 1979-12-05 Probe of noncontact alternating current type electrometer Granted JPS5679959A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15828379A JPS5679959A (en) 1979-12-05 1979-12-05 Probe of noncontact alternating current type electrometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15828379A JPS5679959A (en) 1979-12-05 1979-12-05 Probe of noncontact alternating current type electrometer

Publications (2)

Publication Number Publication Date
JPS5679959A true JPS5679959A (en) 1981-06-30
JPS6351270B2 JPS6351270B2 (en) 1988-10-13

Family

ID=15668206

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15828379A Granted JPS5679959A (en) 1979-12-05 1979-12-05 Probe of noncontact alternating current type electrometer

Country Status (1)

Country Link
JP (1) JPS5679959A (en)

Also Published As

Publication number Publication date
JPS6351270B2 (en) 1988-10-13

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