DeFelsko PosiTector PC v.2.0 - Manual (Page 8)

7
Calibration and Adjustment Calibration and Adjustment
The PosiTector PC probe is factory calibrated and performs an
automatic self-check each time it calculates a measurement. For many
powder measurement applications no further adjustment is necessary.
Simply Zero at the beginning of each shift, then measure.
Sometimes gage measurement calculations can be influenced by the
composition of the coating powder. A calibration adjustment improves
accuracy in these circumstances.
Adjustment, or Calibration Adjustment, is the act of aligning the
gage's predictions to match those of a known cured sample.
Begin by performing a Verification of Accuracy (pg 6) to determine
if there is a need for an adjustment. If the average of several
thickness results is outside the combined tolerances of the two
measuring instruments (PosiTector PC and dry film thickness
instrument) then two adjustment techniques are available to correct
the variance (see Adjustment Techniques, pg 7).
User adjustments are stored in the current Cal setting. It may be
desirable to open a new Cal setting first (see Cal Memory, pg 9).
Adjustment Techniques Adjustment Techniques
To ensure the gage is working properly, the user should periodically
perform an accuracy check by comparing predicted thickness
values with actual cured thickness values (pg 6).
If the average of a series of measurements by both instruments
(PosiTector PC and dry film thickness instrument) is not within
combined tolerances, the PosiTector PC can be adjusted using
one of two methods...
1 Pt Adjust - The first and most common choice.
1.
2 Pt Adjust - If a 1 Pt Adjust does not improve accuracy.
2.
See Cal Settings menu, pg 8 for more details.