check calibration flag CALFLG 7, 3, 2 and 1 = zero value, 17A, 25A and 30A

            btfss       CALFLG,7              ; zero current output voltage calibration
            goto        CAL0                  ; goto calibration 0 value
            btfss       CALFLG,3              ; calibration at 17A
            goto        CAL17
            btfss       CALFLG,2              ; calibration at 25A
            goto        CAL25
            btfss       CALFLG,1              ; calibration at 30A
            goto        CAL30