DeFelsko PosiTector UTG v.3.1 Full Manual - Manual (Page 41)

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Troubleshooting Troubleshooting
Some common reports received by our Service Department along
with possible causes. Most conditions however can be cleared
with a Reset (pg. 13).
Probe continues to measure after lifted from surface
Wipe away any excess couplant on probe tip.
Gage fails to power down
Ensure the probe is clean and free of couplant. The Gage will not
turn off if coupled symbol is displayed on LCD.
Gage is coupled, but not measuring
See Surface Conditions, pg. 7.
Gage readings appear to be double the expected thickness
This sometimes occurs near the minimum measuring range of the
instrument. The first return echo is unmeasurable, so the Gage
measures the second return echo. The resultant calculation is
double the actual thickness.
Measurement jumps as probe is lifted from surface
Occasionally, excess couplant will remain on the probe when the
probe is lifted from the surface. This may cause the PosiTector
UTG to display a final measurement value different from those
observed when the probe was on the surface. Discard this value
and repeat the measurement.
UTG C and UTG M probes