Tomey UD-800 Instruction Manual page 161

Check that the converted acoustic velocity is set
correctly. (Refer to "3.6.2 c) How to display converted
acoustic velocity and bias values.")
The contact section of the pachymetry probe is
damaged.
If damaged, immediately stop measurement and
contact your local distributor.
The pachymetry probe is not calibrated correctly.
Thoroughly wipe the tip of the pachymetry probe and
press the sensitivity calibration button to re-calibrate
the probe.
 Measurement cannot be performed in Auto mode.
The measurement mode is set to Manual.
Switch the mode to auto measurement mode.
 The measureable point does not move immediately when the
pachymetry probe is removed from the cornea.
The tip of the pachymetry probe is wet.
Thoroughly remove any drops of water.
 Monitoring sound does not stop. Data is captured even while the
probe does not contact the eyeball.
The tip of the pachymetry probe is wet.
Thoroughly remove any drops of water.
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