Method and apparatus for measuring small electrical signals

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With storage means for voltage or current

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324130, 36457101, 36457105, G01R 3128, G01R 3500

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active

051210517

ABSTRACT:
A method of and an apparatus for measuring small electrical signals with a computer-supported error-compensating measuring circuit (10) which includes a multiplexer (13), a following amplifier (15), an analog-to-digital converter (16) and a calculation device (17). The multiplexer has at least one pair of measuring signal input terminals (n-1, n) and one pair of zero volt input terminals (A, B) and connects them repeatedly to the following amplifier (15) for signal recording. Memories for digitized signals are present in order to correct, by means of the calculation device, actual measuring signals with correction values determined from a set of first measured signals so that a precise indication value is produced independent of offset errors and their variation.

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