Intellipuff Service Manual
Page 19 of 51
Issue D 27/02/2014
EP59-12317
If the - in focus - condition is met and the continue button is selected, the
currently measured k value and the values of the three photosensors A, B and
C at calibration will be recorded to the EEPROM for use during the operation
of the instrument as part of firing condition parameters.
Having achieved an alignment that satisfies the firing condition, pressing the
next button, displays another form, as shown below, which displays the
photosensor levels A, B, & C as well as K-value achieved at best K. This is
preceded by a routine that does a sanity check on the photosensor signal
levels that will be subsequently saved to the EEPROM during the
programming stage of the instrument.
If this test is passed, the program prompts the user with the form below
instructing the user to replace the test eye with the external pressure
transducer. In the event that the above sanity check fails, the calibration
process will take the user few steps back in the process to the alignment
procedure.
Solenoid Valve Opening Time (Puff Time) Calibration
At this stage, the Pulsair calibration process works out the solenoid valve
opening times iteratively. The form sends a command to fire the solenoid
valve for a preset opening time as a starting point to the iteration. At each puff
time, 8 pulses will be measured for maximum and minimum generated
external pressure in mmHg. The opening time is then decremented or
incremented accordingly to achieve the shortest opening time to produce the
smallest pressure value that is greater or equal to the maximum pressure
required for Soft puff pressure (30mmHg). When this criterion is reached, the
