NASA CP Basic Principles Book
Indice ROCarneval


Operating and Maintenance Instructions

adaptaed from:

Hard spot inspection trolley • PLAMAT-M • 18201
Operating and Maintenance Instructions • V2.0
Calibration procedure

5.5 Recommended calibration parameters

The following calibration parameters are currently considered as sufficient set:

calibration parameters

5.6 Referencing

In general, two different approaches can be considered for referencing/calibration purposes and for performance checks:
  1. Reference plate
  2. Mechanical evaluation
Both are briefly considered in turn.

5.6.1 Reference plate

Steel manufacturer can produce and use plates for reference purposes. These reference plates have to be from known steel quality with an ensemble of representative hard spots.

Reference plates allow to differentiate between base material (OK) and hard spots (NOK) and, hence, validate correct classification of OK/NOK areas on the reference plate.

5.6.2 Mechanical evaluation

An alternative to the validation via reference plates is the mechanical evaluation as reference methodology. The main characteristics are:
• Reference method
• mobile evaluation of the mechanical hardness on the plate
• Leeb hardness tester is recommended
• Variation in hardness measurements
• greater variety of hardness tests on the plate than compared to reference plate
• average value of Leeb hardness tester correlates well with hardness value
• Number of reference inspections
• at least 10 reference inspections per 10x10 mm²
• minimum distance between two Leeb hardness inspections should be considered

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