To perform a zero calibration on an output, verify that the “Zero” option at the top is selected. Press the Ready button to begin the process. Enter the mA value that is being measured at the appropriate terminals (see the Electrical Connections section); the appropriate terminals to measure will also be displayed on the screen). Press the Calibrate button to finish the calibration. The calibration status will be displayed on screen. When it is over, the screen will display “idle” once again. Once the zero calibration has finished, the span calibration can be performed.