Siare Siaretron 4000 Service Manual page 101

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Turbine speed
During the turbine characterization, the characteristic of the turbine is
restored associating the pressure measured by the pressure sensor (from 0
to 80 cmH 2 O approx) to the PWM control of the turbine and this last to the
turbine number of laps.
At the end of turbine
characterization (final calibration
pressure approx. 80 cmH 2 O), the
ventilator switches automatically to
the " CALIBRATRION PROGRAMS
" window.