Calibration Settings; Zero - DeFelsko PosiTector UTG Quick Start Manual

Calibration Settings

Calibration, Verification and Adjustment
Three steps ensure best accuracy:
1.Calibration - typically performed by the manufacturer or a qualified lab. All probes
include a Certificate of Calibration.
2.Verification of Accuracy - typically performed by the user on known reference
standards such as calibration step blocks.
3.Adjustment - to a known thickness or sound velocity for the material to be measured.
Calibration
Calibration is the high-level, controlled and documented process of measuring traceable
calibration standards over the full operating range of the probe, and verifying that the
results are within the stated accuracy of the probe. Calibrations are performed by the
manufacturer, their authorized agent, or by an accredited calibration laboratory in a
controlled environment using a documented process.
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.
Adjustment
Adjustment, or Calibration Adjustment is the act of aligning the Gage's thickness
readings to match that of a known reference sample.

Zero

PosiTector UTG probes must be zeroed after a reset and periodically during use. The
Zero process compensates for probe wear and temperature. To maintain the best
accuracy, perform a Zero when the ambient temperature changes.
1. Make sure the Gage is ON and the probe is wiped clean.
2. Apply a single drop of couplant onto the included zero block (PosiTector UTG CA
only) or built-in zero plate located on the underside of the probe connector. DO NOT
apply couplant directly onto the probe face.
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