Present-day modulated RF experiments that perform power sweeps use a fixed amplitude range to avoid discontinuities induced by range-switching in the acquisition channels of the measurement instrument. However, working with a fixed amplitude range has its shortcomings as it limits the dynamic range of the swept measurements. That{\textquoteright}s why this work proposes to do power sweeps with automatic ranging and tackle the problem of these switching discontinuities. To this end, a noise calibration procedure is developed to get rid of the discontinuities by stitching the figures-of-merit in the power sweep. The developed calibration method is experimentally validated using a power amplifier as a device under test. The calibrated results are compared and discussed with the uncalibrated results to show the impact and the improvement of the proposed calibration.