Range switching circuit for solid state electrometer

Details Range switching circuit for solid state electrometer Range switching circuit for solid state electrometer

1976-07-26

1977-09-20

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

324123R, G01R 1508, G01R 130

Patent

active

040500195

ABSTRACT:
A range switching circuit for a solid state electrometer, e.g., for use in radiacmeter, includes a substantially symmetrical circuit having an n-channel MOSFET and an NPN transistor in one branch and a p-channel MOSFET and a PNP transistor in the other branch. The electrometer includes an operational amplifier with two high value resistors in the feedback path. A latching reed relay selectively shorts out one of the feedback resistors when one of the transistors is gated on by the corresponding MOSFET.

REFERENCES:
patent: 2511562 (1950-06-01), Bresee
patent: 3187323 (1965-06-01), Flood et al.

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