Principles Of Operation Ééééééééééé; Signal Acquisition; Control Program - Sibelmed DATOSPIR TOUCH User Manual

End of Maneuver: Variation lower than
¥
the last 2 seconds.
Delay in the calculation of the maximum pressure value:
¥
Selectable between 0.1 and 4.9 seconds, in the setup; 1
second as a default.
Internal Database: The Spirometer shares the internal data
¥
base for all test types.
3. PRINCIPLES OF OPERATION

3.1. SIGNAL ACQUISITION

The module of maximal pressures includes basically a pressure
sensor, a differential amplifier and a filter.
The pressure sensor covers the range from
cmH O), while maneuvering below 9.8 hPa (10 cmH2O), are
2
rejected. The output of this sensor is amplified and filtered so that
the analogical signal has the intended range and bandwidth. Then,
this signal is transformed into digital with an A/D converter. The
converter used is the same as the one used in the spirometry.

3.2. CONTROL PROGRAM

The control program performs the processing of the acquired
signal. Among the important calculations, we must point out:
Start and end of the maneuver The start of a maneuver is
¥
considered when the level of
The end of the maneuver is considered when there is a
pressure variation lower than
Delay for the calculation: For the calculation of the maximal
¥
pressure, an initial period of time is discarded to avoid
MIP-MEP module userÕs manual
2,95 hPa (3 cmH
1 hPa (1 cmH
16
1 hPa (1 cmH
±295 hPa (±300
O) is surpassed.
2
O).
2
511-BI0-MU2 ¥
O) in
2
REV. 2.02