Psychophysical judgement in electronic part centering

摘要

In spection of printed circuit boards frequently requires a judgement of whether an electronic component, such as a resistor or diode, is properly centered. The present study investigated observers' ability performing this discrimination by modeling a Just Noticeable Difference (JND), deltaS, based upon Weber's fraction, k=deltaS/S. Using computer-generated figures of mis0-centered components, twenty graduate students participated in the experiments of making 'centered' versus 'not centered' judgements. Both the lengths of the leads (varying from 0