Multipurpose test equipment input circuitry

Details Multipurpose test equipment input circuitry Multipurpose test equipment input circuitry

1980-06-05

1983-05-03

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

324110, 324123R, G01R 1508, G01R 136

Patent

active

043822274

ABSTRACT:
An input terminal adapted to receive 0 to 300 volts AC or DC is connected through AC or DC connecting circuits, coupled into the path by switches, and attenuating apparatus including a plurality of ranges automatically switched into the path in response to the amplitude of an input signal, to a buffer which includes overvoltage protection and provides a relatively high input impedance with a relatively low output or source impedance. A frequency counter is connected through a hysteresis amplifier, a digital volt meter is connected through an amplifier including 60 cycle filtering and an oscilloscope is connected through an independent gain amplifier to the output of the buffer.

REFERENCES:
patent: 2940043 (1960-06-01), Nagy, Jr.
patent: 2976462 (1962-03-01), Miller
patent: 3408569 (1968-10-01), Douglass et al.
patent: 3875506 (1975-04-01), Cath et al.

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