A method and apparatus for calibrating a device. The method includes: selecting a first power level at which a device is to transmit a radio frequency signal; receiving a radio frequency signal having been transmitted from the device based on a predetermined calibration value associated with the first power level; measuring a power level of the radio frequency signal transmitted from the device; based on the measured power level of the radio frequency signal, adjusting the predetermined calibration value associated with the first power level so that (i) a measured power level associated with a radio frequency signal transmitted from the device based on the adjusted predetermined calibration value falls within a predetermined range of the first power level; and based on the adjusted predetermined calibration value, calibrating each predetermined calibration value for a plurality of power levels other than the first power level.