Auto ranging current monitor with common mode correction

Details Auto ranging current monitor with common mode correction Auto ranging current monitor with common mode correction

1996-11-26

1999-07-06

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

324130, G01R 2106

Patent

active

059201894

ABSTRACT:
An improved current monitor for measuring current over a wide dynamic range. The current monitor includes a low current channel, a high current channel, and a switch for selecting the low current channel if the measured current is below a predetermined level and the high current channel if the current is above the predetermined level. The output of the high current channel is voltage encoded by adding a fixed offset. The current monitor determines that the measured current is from the low current channel if the reading is below the offset and from the high current channel if the reading is above the offset. A current level output device automatically outputs a decoded current reading based on this determination. The current monitor also incorporates a low current error compensation circuit to compensate for parasitic current when the current monitor is using the high current channel. The current monitor also incorporates a device for reducing the common mode error voltage to zero in the differential amplifiers used to convert current across shunt resistors in the low and high current channels to a voltage signal.

REFERENCES:
patent: 4303881 (1981-12-01), Czewien et al.
patent: 4943764 (1990-07-01), Szente et al.
patent: 5119019 (1992-06-01), George
patent: 5266888 (1993-11-01), Aslan
patent: 5278493 (1994-01-01), Henkelmann
Keithley Instruments, Inc., Keithley Model 2400 Digital Source Meter Brochure, Copyright 1996 (unavailable month).

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