Fluke Biomedical VT Mobile - Manual (Page 64)

VT MOBILE
Operators Manual
7-4
Troubleshooting
Refer to Table 7-1 for troubleshooting procedures.
Table 7-1. Troubleshooting the Analyzer
Problem Possible Cause Corrective Action
Analyzer does not turn on -
Screen is dark No power or dead battery Plug battery eliminator into an AC
mains outlet or install a new battery.
Press the Power key on.
Screen contrast not set Adjust screen contrast.
Analyzer screen turns on but
displays nothing. Splash may or
may not appear before screen
goes blank Flash program memory not
loaded If problem persists, call Service.
Flash memory or boot memory
resulted in incorrect checksum. If problem persists, call Service.
Screen contrast not set Adjust screen contrast
Screen is difficult to read Screen contrast not set Adjust screen contrast
"Out of Range" messages
appear Measured signals out of
specified range Ensure that all pressures and flow
rates are within the Analyzer specified
limits.
Unit calibration is incorrect If problem persists, call Service.
Tidal Volumes are erratic Breath detection threshold set
too low. Noise from ventilator is
causing "false" breaths. Set the breath detection threshold to a
higher value.
Tidal volumes different than
expected. Your expected value was
incorrect. Review expectations.
Flow baseline drifts, causing a
false non-zero flow reading
when flow was actually zero. Zero the flow reading.
Analyzer is out of calibration. Contact Service.
Gas settings are incorrect. Review Analyzer gas settings.
Correction mode is set to BTPS
or STPD instead of ATP. Set gas mode to appropriate setting for
your application. Most applications may
require the ATP mode.
BTPS or STPD correction
method on the Analyzer is
different that the method used
by the ventilator manufacturer. Corrections for BTPS and STPD may
vary among different ventilator
manufactures. The biggest difference
is in the water vapor volume correction.
The Analyzer uses the setting for
relative humidity and temperature to
determine the actual volume of water
vapor in the flowing gas. The Analyzer
subtracts this volume from the total
volume for "dry" gas corrections. For
"saturated" gas correction, the
Analyzer computes a make-up volume
of water vapor and adds it to the
measured volume.