JPS55149855A - Noise reducing circuit in noncontact type electrometer - Google Patents
Noise reducing circuit in noncontact type electrometerInfo
- Publication number
- JPS55149855A JPS55149855A JP4535979A JP4535979A JPS55149855A JP S55149855 A JPS55149855 A JP S55149855A JP 4535979 A JP4535979 A JP 4535979A JP 4535979 A JP4535979 A JP 4535979A JP S55149855 A JPS55149855 A JP S55149855A
- Authority
- JP
- Japan
- Prior art keywords
- electric field
- differential amplifier
- voltage
- output
- detecting electrode
- 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 Current Or Voltage (AREA)
Abstract
PURPOSE: To prevent disturbance noise from occurring, by applying to an electric field modulator an output from a current-voltage converter, which is generated in accordance with an electric potential of an object to be measured, and an output voltage from a differential amplifier into which a predetermined D/C voltage is inputted.
CONSTITUTION: An electric field generated on the surface of an object 1 to be measured is applied to a detecting electrode 4 as a passing area for the electric field is periodically changed by an electric field modulator 5. An output from the detecting electrode 4 is applied to one of input terminals of a differential amplifier 8 through an operational amplifier 7, and a predetermined DC voltage to the other terminal of the differential amplifier 8. An output voltage from the differential amplifier 8 is applied to the electric field modulator 5 through a shield plate 2 so as to offset an undue potential difference occurring between the electric field modulator 5 and the detecting electrode 4.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4535979A JPS55149855A (en) | 1979-04-16 | 1979-04-16 | Noise reducing circuit in noncontact type electrometer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4535979A JPS55149855A (en) | 1979-04-16 | 1979-04-16 | Noise reducing circuit in noncontact type electrometer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55149855A true JPS55149855A (en) | 1980-11-21 |
Family
ID=12717079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4535979A Pending JPS55149855A (en) | 1979-04-16 | 1979-04-16 | Noise reducing circuit in noncontact type electrometer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55149855A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS564062A (en) * | 1979-06-25 | 1981-01-16 | Canon Inc | Surface electrometer |
JPS56126767A (en) * | 1980-02-18 | 1981-10-05 | Williams Bruce T | Static voltmeter |
-
1979
- 1979-04-16 JP JP4535979A patent/JPS55149855A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS564062A (en) * | 1979-06-25 | 1981-01-16 | Canon Inc | Surface electrometer |
JPH036467B2 (en) * | 1979-06-25 | 1991-01-30 | Canon Kk | |
JPS56126767A (en) * | 1980-02-18 | 1981-10-05 | Williams Bruce T | Static voltmeter |
JPH0128348B2 (en) * | 1980-02-18 | 1989-06-02 | Williams Bruce T |
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