Calibration Errors; Auto-Calibration; Details On Tc Serial Command - DeVilbiss SleepCube nCPAP Service Manual

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B. Calibration Errors
Code
E95
Calibrate Motor Stop Error
not stop during device calibration. This error only
occurs during the calibration procedure.
C. Auto-Calibration
The DV54/DV53 PAP automatically adjusts calibration to
maintain accuracy over time and under varying operating
conditions. Each time the blower is turned OFF, the PC control
board reads and saves the offset voltages from the pressure
transducer. The PAP uses these voltages to maintain calibra-
tion accuracy as the unit is used over time.
D. Details on Tc Serial Command
Tc serial commands are used in the manual calibration pro-
cedure listed in Section A. The 'Tc' command on the terminal
program reads the unit's current calibration values, starts
the calibration procedure, and handles user feedback dur-
ing the calibration process. Refer to the manual calibration
procedure for details on the calibration process.
• Sending 'Tc=s' to the PAP starts the calibration process.
• Sending 'Tc' without a modifi er requests the current
calibration values. A comma-separated list of all cal values
is returned.
Comma-separated response to 'Tc' with no modifi er:
llll,hhhh,mmmm<cr>
o llll is the pressure low cal (sensor offset). Convert to
voltage by dividing by 1024 and multiplying by 5.
o hhhh is the pressure high cal (sensor output at 20
cmH2O). Convert to VDC by dividing by 1024 and mul-
tiplying by 5.
o mmmm is the motor current calibration (adc offset)
• Feedback is provided to the calibration task by sending
'Tc=y' when prompted.
14
LT-2026
Description
. The blower did