I am measuring EC of solution . I got Vec is 0.98V . After that, I took it to summing amplifier to reduce error from measurement . However, I saw a problem is that Vout of summing amplifier was continuously variable from 4.5V to 4.85V, not 1V - 1.85V with value of potentionmeter is 180k. I hope I receive your help . Tks you !
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