Hi,

Thanks mat for the schematic. But as you know that scaling down a common mode signal does introduce error even if 1% resistors are used.I do not have the option to use 0.1% tolerance resistors. Op-Amp offset and drift also plays an important role. I have already solved the problem by using two different supplies. A current to voltage converter running from the negative supply itself followed by an inverting amplifier to get a ground referenced voltage signal. Anyway thank you very much for shedding some light and helping. I may use it in a different application.