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For CN035, why  does one of CN0359 intermediate voltage electrode needing op-amp buffer, but another without buffer?

Question asked by hpkamen on Jul 26, 2016
Latest reply on Jul 29, 2016 by R.L

Dear Sir/Madam,


For CN0359 four-electrode conductivity meter, why should only one of the circuit voltage electrodes using buffer, but another does not need.

In addtion, when testing, we found that voltage on the electrodes have about 1V DC offset? Why?