What does it mean to push the eight-character correction value?

The corrected value refers to the value of "adding the uncorrected measurement results by algebraic method to compensate its systematic error". The correction value is equal to the negative system error estimate. For example, if the measured value is 30. 1℃ and the measured result is 30℃, the estimated value of the known system error is +0. 1℃. That is, the corrected value is -0. 1℃, and the corrected measured value is equal to the uncorrected measured value plus the corrected value, that is, the corrected measured value is 30.1℃+(-0.1)℃ = 30.0℃.