High speed temperature controlled electrometer

Details High speed temperature controlled electrometer High speed temperature controlled electrometer

1980-10-14

1983-01-25

Tokar, Michael J.

Electricity: measuring and testing

Electrostatic field

324441, 324458, G01N 2700

Patent

active

043706150

ABSTRACT:
A high speed temperature controlled, microcircuit electrometer comprising a preamplifier with a very high resistance feedback resistor and temperature sensor on a substrate which is temperature controlled by a thermo-electric module on which the substrate is mounted and which is held within a very small temperature range by temperature control circuitry. The preamplifier, feedback resistor, temperature sensor and thermo-electric module are all enclosed in a hermetically sealed, dry gas environment, maintained at an essentially constant temperature, to reduce the effects of hostile environments, such as temperature changes, vibration, contamination, and humidity. This electrometer operates at high speed and is highly responsive to small current values such as ion currents generated by ionized gas molecules in a mass spectrometer.

REFERENCES:
patent: 3383614 (1968-05-01), Emmons et al.
patent: 3392333 (1968-07-01), Blondfield
patent: 3522531 (1970-08-01), Cohn
patent: 4222006 (1980-09-01), Schneider

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