JPS55117969A - Surface potentiometer - Google Patents
Surface potentiometerInfo
- 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
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
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) |
-
1979
- 1979-03-06 JP JP2510179A patent/JPS55117969A/en active Pending
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