Low noise charge ramp electrometer

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With amplifier or space discharge device

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324 99D, H03K 1320, G01R 1706

Patent

active

051535025

ABSTRACT:
An 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.

REFERENCES:
patent: 3439272 (1969-04-01), Bailey et al.
patent: 3566265 (1971-02-01), Reid
patent: 3921012 (1975-11-01), Marshall, III
patent: 3939459 (1976-02-01), Hoopes
patent: 4082998 (1978-04-01), Marriott
patent: 4804909 (1989-02-01), Fink

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