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G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
G01N27/045—Circuits
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FR909038D1944-09-151944-09-15Procédé pour l'observation continue du ph. d'un milieu
ExpiredFR909038A
(fr)