The two components of velocity fluctuations are determined as follows. Let and be the RMS voltages of fluctuations sensed by wires 1 and 2 respectively. The effective velocity fluctuations that the voltages correspond to are given by

where the derivatives are calculated from the calibration curves of wires 1 and 2. These equations can be interpreted for instantaneous voltages and velocities, or in terms of RMS values
Since is small it can be set equal to zero for calculations of the turbulence levels. Hence