Calibration, Verification And Adjustment - DeFelsko PosiTector Instruction Manual

Calibration, Verification and Adjustment

Calibration, Verification and Adjustment
Three steps ensure best accuracy...
1. Calibration - typically performed by the manufacturer. All probes
include a Certificate of Calibration.
2. Verification of Accuracy - typically performed by the user on
known reference standards such as the included test block.
3. Adjustment - to a known hardness
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
Verification is an accuracy check performed by the user on known
reference standards. A successful verification requires the Gage to
read within the combined accuracy of the probe and the test blocks.
Instrument operation may be verified with the included test block.
Place the test block on a flat, hard surface and take three to five
readings. The measurement points should be at least 6mm (0.24")
apart. If the average of those readings is outside than the combined
accuracy of the test block and gage, the gage may require service.
Some causes for the gage to not read properly are the indentor
being damaged, incorrect pressure being applied to the test block or
temperatures beyond normal conditions.
Verify accuracy at the beginning and the end of each work shift.
During the work shift, if the Gage is dropped or suspected of giving
erroneous readings, its accuracy should be re-verified.
Adjustment
Adjustment, or Calibration Adjustment, is the act of aligning the
Gage's readings to match that of a known reference in order to
improve accuracy of a gage on a specific material. (see 1 Pt Adjust,
pg. 4)
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