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Title: A low noise charge ramp electrometer

Abstract

This invention depicts a electrometer capable of measuring small currents without the use of a feedback resistor which tends to contribute a large noise factor to the measured data. The electrometer eliminates the feedback resistor through the use of a feedback capacitor located across the electrometer amplifier. The signal from the electrometer amplifier is transferred to a electrometer buffer amplifier which serves to transfer the signal to several receptors. If the electrometer amplifier is approaching saturation, the buffer amplifier signals a reset discriminator which energizes a coil whose magnetic field closes a magnetic relay switch which in turn resets or zeros the feedback capacitor. In turn, a reset complete discriminator restarts the measurement process when the electrometer amplifier approaches its initial condition. The buffer amplifier also transmits the voltage signal from the electrometer amplifier to a voltage-to-frequency converter. The signals from the voltage-to-frequency converter are counted over a fixed period of time and the information is relayed to a data processor. The timing and sequencing of the small current measuring system is under the control of a sequence control logic unit.

Inventors:
;
Publication Date:
Research Org.:
Westinghouse Idaho Nuclear Co., Inc., Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
140172
Patent Number(s):
PATENTS-US-A7758045
Application Number:
ON: DE94003062; PAN: 7-758,045
Assignee:
Dept. of Energy ICPP; SCA: 440800; 426000; PA: EDB-94:014717; NTS-94:007510; ERA-19:005083; SN: 93001096041
DOE Contract Number:  
AC07-84ID12435
Resource Type:
Patent Application
Resource Relation:
Other Information: PBD: 1991
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; ELECTROMETERS; DESIGN; INVENTIONS; POWER AMPLIFIERS; DISCRIMINATORS; LOGIC CIRCUITS

Citation Formats

Morgan, J.P., and Piper, T.C. A low noise charge ramp electrometer. United States: N. p., 1991. Web.
Morgan, J.P., & Piper, T.C. A low noise charge ramp electrometer. United States.
Morgan, J.P., and Piper, T.C. Tue . "A low noise charge ramp electrometer". United States. https://www.osti.gov/servlets/purl/140172.
@article{osti_140172,
title = {A low noise charge ramp electrometer},
author = {Morgan, J.P. and Piper, T.C.},
abstractNote = {This invention depicts a electrometer capable of measuring small currents without the use of a feedback resistor which tends to contribute a large noise factor to the measured data. The electrometer eliminates the feedback resistor through the use of a feedback capacitor located across the electrometer amplifier. The signal from the electrometer amplifier is transferred to a electrometer buffer amplifier which serves to transfer the signal to several receptors. If the electrometer amplifier is approaching saturation, the buffer amplifier signals a reset discriminator which energizes a coil whose magnetic field closes a magnetic relay switch which in turn resets or zeros the feedback capacitor. In turn, a reset complete discriminator restarts the measurement process when the electrometer amplifier approaches its initial condition. The buffer amplifier also transmits the voltage signal from the electrometer amplifier to a voltage-to-frequency converter. The signals from the voltage-to-frequency converter are counted over a fixed period of time and the information is relayed to a data processor. The timing and sequencing of the small current measuring system is under the control of a sequence control logic unit.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {12}
}

Patent Application:

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