Preamplifier for voltage measuring instrument with non-interacti

Details Preamplifier for voltage measuring instrument with non-interacti Preamplifier for voltage measuring instrument with non-interacti

1980-03-03

1982-02-09

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With amplifier or space discharge device

324115, 324131, G01R 130, G01R 1508

Patent

active

043152112

ABSTRACT:
A preamplifier circuit for a voltage measuring instrument which provides for noninteracting span and zero adjustments. Two voltage follower circuits are used. The first produces a current through the output resistor of the preamplifier proportional to the voltage being measured while the second produces a current through the output resistor proportional to a fixed reference voltage. For both amplifiers, the proportionality is adjustable by a potentiometer which modifies the feedback on the first amplifier and the part of the reference used as input to the second amplifier.

REFERENCES:
patent: 3281685 (1966-10-01), Talbot, Jr.
patent: 3317833 (1967-05-01), Miller
patent: 3401393 (1968-09-01), Cirimele et al.
patent: 3697871 (1972-10-01), MacMullan
patent: 4213088 (1980-07-01), Nossen

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