The disadvantages of the conventional methods and intelligent look-up tablemethods of errorcorrection in DC measurements are revealed.A mathematicalmodel of the system errors processing has been established and a new correctionmethod with.software is developed.A set of experimental results shows thatthe hardware of the system can be much simplified and the strict demands forthe parameters of the electronic elements and compononts can be significantlyreduced.A very good real-time error-correction result has been obtained.This method can also beused in the system for the measurement of slowvaried signals.