_:n344550b2e6454ce9aa815274bc8b9b83xb14
<http://schema.org/text>
"There are several possible causes for variations between calibrations:\n\nThe surface was washed with a hot or cold solution prior to calibration, and was not allowed sufficient time to normalize\nThe plate is improperly supported (See Q.16)\nTemperature change\nDrafts\nDirect sunlight or other radiant heat on the surface of the plate. Be sure that overhead lighting is not heating the surface\nVariations in the vertical temperature gradient between winter and summer (If at all possible, know the vertical gradient temperature at the time the calibration is performed.)\nPlate not allowed sufficient time to normalize after shipment\nImproper use of inspection equipment or use of non-calibrated equipment\nSurface change resulting from wear"
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