Calibration; Manual Calibration - DeVilbiss SleepCube Gebrauchsanleitung

7. Calibration

A. Manual Calibration
DeVilbiss recommends calibrating the DV54/DV53 PAP if
replacing the PC control board or when testing or trouble-
shooting indicate calibration is required. The manual
calibration procedure accesses a terminal program via the
unit's communication port to calibrate the internal pressure
sensor and the motor current circuitry. Progress and confi r-
mation messages display on the terminal screen throughout
the procedure. If a failure occurs during calibration, the error
displays as well. See Calibration Errors below.
Additional equipment: IBM or Compatible PC with a free serial
port, PAP to PC cable (DV54/DV53D-615), a terminal program
(Microsoft Windows HyperTerminal or equivalent) and a
calibrated pressure gauge (0 to 30 cmH
Please read all steps before beginning this process.
NOTE– Details on the Tc serial commands used in this proce-
dure are listed in Section D.
1. Use the PAP to PC cable to connect the DV54/DV53 PAP to
a PC serial port and apply AC power to the PAP.
2. Use a terminal program (such as Windows HyperTerminal,
or equivalent) with COM settings 9600 baud, no parity, 8
data bits, 1 stop bit, Flow Control set to none.
3. When connection is established with the PAP, the terminal
program will show: 'RI;' every 0.5 seconds. This display
indicates that the PAP is waiting for a handshake.
4. Type 'ri' (all DV54/DV53 commands are case sensitive)
and press ENTER. The PAP will respond with the fi rmware
version in the form 'V0.XX dd/mm/yyyy'. Repeat this
step if necessary to complete the handshake.
5. Start the calibration process by typing 'Tc=s' and pressing
ENTER. The PAP will respond with
'Calibration Started'. If the unit responds with 'WF',
resend the 'Tc=s' command.
6. The PAP will begin sending messages and prompting for
responses to complete the calibration. NOTE: If a calibra-
tion failure is encountered at any stage during the pro-
cedure, the PAP will respond with 'Cal failed: EXX',
where XX is a two digit error code.
a. PAP sends 'Waiting for blower to stop spin-
ning'.
b. PAP sends 'Cal press offset' when spinning is
stopped.
During this stage of the procedure the PAP stops the
blower and saves the pressure sensor and motor current
offsets. After a short delay, the PAP increases the pressure
to approximately 20 cmH
c. PAP sends 'Set pressure to 20 cmH2O using
Tw+, Tw-, or Tw=' 'Send Tc=y when ready'
d. Connect the pressure gauge to the PAP outlet (the
O).
2
O.
2
outlet should be in a deadhead or zero fl ow condition)
and, using the computer keyboard ('Tw+' followed by
ENTER increases the pressure and 'Tw-' followed by
ENTER decreases the pressure), adjust the PAP pressure
to 20 cmH2O (± 0.1 cmH2O), then type 'Tc=y' followed
by ENTER.
e. PAP sends 'Reading and saving pressure hi
cal' after confi rming that the pressure is correct.
During this stage of the procedure, the PAP calibrates
the pressure sensor by reading and saving the high
pressure calibration value.
NOTE– As an alternative to steps d and e, the current PAP
pressure gauge reading can be sent to the PAP from the
terminal. Perform the following steps for this option:
Use the 'Tw+', 'Tw-', or 'Tw=X' (where X is a number
between 0 and 1023 to adjust the pressure to a value
between 15 and 30 cmH2O.
If the pressure is already within this range no adjustment
is needed.
NOTE: A more accurate calibration will be obtained, if the
value is close to 20 cmH2O.
7. Send the pressure to the PAP in the format 'Tc=yxxxxx',
where xxxxx is the gauge pressure in cmH2O multiplied
by 1000 (Example: 20 cmH2O is sent as 'Tc=y20000'.)
8. After a short delay the PAP will respond with 'cal suc-
cessful'. Calibration is now complete. Please check the
PAP pressure settings for accuracy.
EN
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