The 11683A range calibrator is specifically designed for use with the EPM, EPM-P series, E1416A and the 70100A and 43X power meters. It allows verification of full-scale meter readings on all ranges, as well as meter tracking. Simply connect the cable between the power meter and calibrator. The CAL ADJ control on the power meter is used to set the meter to full scale on the 1 mW range.