JPS54147878A - Lower noise preamplifier of ac type surface electrometer - Google Patents
Lower noise preamplifier of ac type surface electrometerInfo
- Publication number
- JPS54147878A JPS54147878A JP5562178A JP5562178A JPS54147878A JP S54147878 A JPS54147878 A JP S54147878A JP 5562178 A JP5562178 A JP 5562178A JP 5562178 A JP5562178 A JP 5562178A JP S54147878 A JPS54147878 A JP S54147878A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- input terminal
- case
- electric field
- type surface
- 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 the generation of noise electric fields by shorting one of the input terminals of an operational amplifier and a metal case to become of the same potential.
CONSTITUTION: The AC current owing to the AC voltage corresponding to the electric field from the measuring object 8 detected by the detecting electrode 4 of an AC type surface electrometer is applied to the negative input terminal of the operational amplifier 5 of a preamplifier and is inversion-amplified, whereby the voltage corresponding to the measuring object electric field is generated. The positive input terminal of this amplifier 5 is held shorted to the metal case 6 of the amplifier 5 by a conductor 9, thus the positive input of the amplifier 5 and the case 6 become of the same potenital. Hence, the generation of the noise electric field between the negative input terminal to which the detecting current of the amplifier 5 is applied and the case 6 is prevented and the preamplifier is made lower in noise. The similar results may also be obtained even by letting the positive input terminal side be input and shorting the negative input terminal to the case.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5562178A JPS54147878A (en) | 1978-05-12 | 1978-05-12 | Lower noise preamplifier of ac type surface electrometer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5562178A JPS54147878A (en) | 1978-05-12 | 1978-05-12 | Lower noise preamplifier of ac type surface electrometer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54147878A true JPS54147878A (en) | 1979-11-19 |
Family
ID=13003843
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5562178A Pending JPS54147878A (en) | 1978-05-12 | 1978-05-12 | Lower noise preamplifier of ac type surface electrometer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54147878A (en) |
-
1978
- 1978-05-12 JP JP5562178A patent/JPS54147878A/en active Pending
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