DeFelsko PosiTector 200 v.3.0 Quick Guide - Manual (Page 6)

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The PosiTector 200 interprets the largest “echo” or “echoes”
within the selected range as the coating/coating or
coating/substrate echo. If the coating thickness is outside this
range, incorrect or dashed readings may occur.
IMPORTANT:
Cal Settings Menu Cal Settings Menu
The probe must be periodically zeroed using the Zero menu option
to compensate for both extreme temperature and probe wear
effects. Before using, allow the probe to reach ambient
temperature. Wipe the probe clean of couplant. The icon
appears after probe is zeroed.
If measurements will be made in extreme hot or cold temperatures,
it is recommended to Zero the probe in the working environment.
If measurements will be made on rough substrates, it is
recommended to periodically Zero the probe to compensate for
wear.
Zero
Set Range
The measuring range of each probe can be changed depending on
the specific application or the expected thickness range of the
coating system.
For most applications, the default range values do not have to be
adjusted. But some conditions, like surface roughness, may cause
the Gage to display very low or non-repeatable readings. In this
case, the low range may be increased to cause the Gage to only
display readings above the Lo value set by the user.
To adjust Set Range values...
1. Select or .
2. Use the (-)(+) buttons to decrease/increase the displayed value.