air data test set mps 30 digital portable user manual - CALIBRATION ...

MPS 30 User’s Manual DMMC/0803/CM
Press the GO/RETURN key twice, the script NULLP (zero Pitot) appears.
Apply the same formula to the pitot zero correction:
New NULLP = True Pressure - Read Pt + Old NULLP
Press the GO/RETURN key repeatedly until the operative menu appears. At
approx. 50,000 ft the two transducers values must be equal to the calibrator value. If
this does not applies, repeat the zero correction, taking particular care to the “–” or
“+” values of the differences.
15.2 Gain Correction
Return to the ambient pressure and vent the static line, the pitot line, and the
pressure calibrator at ambient pressure.
When the readings are stable, take note of the three values: calibrator pressure,
MPS30 static pressure (Ps), MPS30 pitot pressure (Pt).
Take the calibrator pressure as the true pressure.
Re-enter the Fine Tuning Function by pressing the Fz key.
Insert the code word (0099) and press the GO/RETURN key until GAINS (Static
Gain) appears.
Divide the pressure value of the calibrator by the MPS30 static pressure and
multiply the number obtained by the GAINS value indicated by the MPS30. Insert
the result of this operation as the new static gain:
New GAINS = (True Pressure/Read Ps) × Old GAINS
Press the GO/RETURN key twice until the script GAINP appears. Divide the
pressure value of the calibrator by the MPS30 pitot pressure and multiply the
number obtained by the GAINP value indicated by the MPS30. Insert the result of
this operation as the new pitot gain:
New GAINP = (True Pressure/Read Pt) × Old GAINP
Press the GO/RETURN key until the operative menu re-appears. Now the
pressures indicated by the static and the pitot transducers must be equal.
To save the new calibration data in memory, press the MEM key twice.
Issue Aug. 03 D. Marchiori PROPRIETARY INFORMATION - 44
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