Ge XLG3 Manuel d'utilisateur télécharger pdf (Page 111)

102 Chapter 7 Measuring Features and Defects GE Inspection Technologies XLG3 VideoProbe System

Bad Example

From this in-focus distance, there is little difference between the

shadow positions on the raised and recessed surfaces, so you are

unlikely to get an accurate depth measurement.

Good Example

With the tip closer to the surface, even though the image becomes

blurry, the break in the shadow is more significant, so you are more

likely to get an accurate depth measurement.

Note: For both depth and skew measurements, the points that you

want to measure must fall in the horizontal center of the shadow.

Both images were captured for depth

measurement.

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Ge XLG3 Manuel d'utilisateur Page 111