Input circuit for electronic instruments

Details Input circuit for electronic instruments Input circuit for electronic instruments

1979-02-21

1981-07-07

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

328165, G01R 1500

Patent

active

042777496

ABSTRACT:
An input circuit for electronic instruments, particularly measuring instruments, has an input for an input signal with a DC and an AC component and has an output for connection to the electronic instrument. A direct current or direct voltage source is provided, and a compensating circuit compensates the DC component of the input signal in such a way that the AC component is isolated and presented at the output. The compensating circuit is basically an impedance network consisting of three resistors connected in a .pi.-style with the two outer resistors being connected to direct voltage or direct current sources which are jointly variable in such a way that they cancel each other at the input and the DC component of the input signal can be compensated at the output.

REFERENCES:
patent: 2900501 (1959-08-01), Momberg

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