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The measurement equipment consists of a Windows PC, a hardware
data acquisition card, and a wire connector box. The PC is
installed with National Instrument's data acquisition
software called . The voltage is measured across a sense
resistor connected in series with the battery to obtain the system
power consumption. It is sampled at a rate of .
is programmed to integrate power every second. By carefully
designing the benchmarks, the energy consumption of software
events of interest can be captured. The energy measurements for a
given benchmark were made on the handheld computers on the same
day without interruption (in order to minimize the day-to-day
difference due to changes in temperature, slight changes in the
resistance of the sense resistor, ).