calibration,
standardisation,
standardization the act of checking or adjusting (by comparison with a standard) the accuracy of a measuring instrument; "the thermometer needed calibration"
alignment the act of adjusting or aligning the parts of a device in relation to each other
collimation the accurate adjustment of the line of sight of a telescope
temperament an adjustment of the intervals (as in tuning a keyboard instrument) so that the scale can be used to play in different keys
tune-up adjustments made to an engine to improve its performance
