A method and related input device and processing system and are disclosed, the method comprising acquiring first capacitive measurements of first resulting signals responsive to driving a first sensing signal, wherein acquiring first capacitive measurements comprises receiving a predefined number of current pulses within a first burst period. The method further comprises acquiring second capacitive measurements of second resulting signals responsive to driving a second sensing signal having a greater sensing frequency. Acquiring the second capacitive measurements comprises inserting, based at least on the sensing frequency of the second sensing signal, one or more null time periods within the second burst period such that the same number of current pulses is received during the second burst period.