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G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
G01R19/0023—Measuring currents or voltages from sources with high internal resistance by means of measuring circuits with high input impedance, e.g. OP-amplifiers
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FR712658D1931-03-051931-03-05Méthode pour la mesure des forces électromotrices en circuit ouvert
ExpiredFR712658A
(fr)