Input ranging circuit for an electronic instrument

Details Input ranging circuit for an electronic instrument Input ranging circuit for an electronic instrument

1997-09-18

2000-07-25

Ballato, Josie

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324115, 324 731, G01R 3128

Patent

active

06094045&

ABSTRACT:
An input ranging circuit for an electronic instrument that allows for measuring a.c. voltage, d.c. voltage, and d.c. resistance is provided. The voltage ranging circuit has three modes, d.c. volts, a.c. volts, and ohms, which are selected by a mode switch. A resistor network containing an input resistor, feedback resistors, a reference resistor, and divider resistors provides resistances that are ratiometrically scaled to maintain relatively tight ratio tolerances. A switch array coupled to the resistor network provides for the selected circuit configuration and divider ratio in conjunction with the mode switch. Each of the switches in the switch array may be independently controlled via control signals. In d.c. volts mode, the input voltage is divided down according to a desired voltage divider ratio. In a.c. volts mode, the voltage divider is supplemented with an a.c. amplifier configured to extend the useful bandwidth of the input ranging circuit. In ohms mode, a programmable current scaled according to the ratio of resistances in the resistor network is induced through an unknown resistance and the voltage drop is provided at an ohms sense output.

REFERENCES:
patent: 4604569 (1986-08-01), Tedd et al.
patent: 5332963 (1994-07-01), Hightower et al.
patent: 5373410 (1994-12-01), Schreiber et al.
patent: 5463315 (1995-10-01), Grace et al.

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