DeFelsko PosiTector UTG v.2.2 - Manual (Page 9)

9
Verification
Gage accuracy can and should be verified using
known reference standards of the material to be
tested.
Verification is an accuracy check performed by the
user using known reference standards. A successful
verification requires the Gage to read within the
combined accuracy of the Gage and the reference
standards.
Calibration step blocks are available for this
purpose. But while they are valuable for verifying
gage accuracy to tight, traceable tolerances, they
may not represent the actual material to be
measured.
Therefore a reference standard can also be a small
piece of the material to be measured. If the actual
material is not available, material of the same
composition (sound velocity) can be used. Thickness
can be determined with alternate means such as a
Certification: All PosiTector UTG instruments ship
with a Certificate of Calibration. For organizations
with re-certification requirements, gages may be
returned at regular intervals for calibration.
DeFelsko recommends that customers establish
gage calibration intervals based upon their own
experience and work environment. Based on our
product knowledge, data and customer feedback, a
one year calibration interval from either the date of
calibration, date of purchase, or date of receipt is a
typical starting point.
standards and verifying that the results are within the
stated accuracy of the Gage. Calibrations are
typically performed by the Gage manufacturer or by
a certified calibration laboratory in a controlled
environment using a documented process.