APPENDIX A STANDARD CALIBRATIONA.2 Span CalibrationBefore initiating Span Calibration, determine the balance’s model number. It appears when thebalance is powered up. Also be sure to have masses availablePress and hold Cal Menu until Menu Calibrate is displayed with CALIBRATE blinking, thenrelease the button. Press Yes to enter calibration. CAL AUTOCAL is displayed. Press No.Press Yes to initiate span calibration. For a splitsecond SPAN_ CLEAR SPAN will come up on thedisplay and then 100_ACCEPT ?.Press No to toggle to 50_ACCEPT ? and back to100_ACCEPT ? for the acceptable weight used if theacceptable weight is 100 grams . Then press Yes.100ACCEPT ?Next the display shows the Add Weight messagewith the weight selected. Place the indicated weightin the Pan. Calibration will begin.100ADD WEIGHTThe SPAN BUSY message flashes while the balancereads the maximum weight setting.SPANBUSYWhen the maximum weight reading is taken, theClear Pan message appears. Remove weights toallow the zero reading to be taken.100CLEAR PANWhile the balance takes the zero reading, 0_BUSYis displayed.0BUSYIf calibration is successful the SPAN DONE messageappears, and an * appears on the left of the screen,signifying that the balance is stable. A small Oappears on the top left of the screen, meaning thezero reading is set.SPANDONEIf calibration is unsuccessful, SPAN ABORT appears.This may mean the balance is unstable – level thebalance and try again. If still unsuccessful, check forproblems as explained in Chapter 3 of this manual.SPANABORTWhen calibration is finished, the balance returns to the weighing mode.Discovery Balance Service Manual A-3 Ohaus Corporation www.ohaus.com
