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High Input Impedance op amp

Question asked by mcyzzq on May 19, 2015
Latest reply on May 29, 2015 by mcyzzq

Dear all,


I am measuring the resistance of a large resistor (up to several Mohms) using 4-wire terminal. The resistance is so large that it surpasses the input impedance of my voltmeter (100MOhm). So I am looking for an differential operational amplifier that offers a large input impedance (>2GOhm), that could take input spans several microvolts up to 0.5 volt.


Could you offer me some products that fits into our application?