The calibration may only be adjusted in a positive direction as the
meter monitors the peak pressure value. Therefore if the respiratory
pressure meter reading was greater than the manometer reading the
calibration screw must be turned anti-clockwise a few turns before
calibration is attempted.
Connect the respiratory pressure meter to the manometer as
previously shown. Fill the syringe to obtain the required negative
pressure and then turn the calibration screw slowly in a clockwise
direction until the same value is displayed on the meter.
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