RFI
See radio-frequency interface.
resolution
The least significant digit to which a physical quantity can be read. High resolution does not imply high accuracy.
S
skew
Misalignment of the part with respect to the X and Y axes. This misalignment creates measurement errors unless the part is repositioned or the de-skew feature of the metrology software redefines the measurement axes.
surface illumination
An illumination method that provides an image of enhanced contrast, and minimum illumination to view the component clearly.
surface light
Lighting applied to the object from the same side as the camera so that surface features can be viewed on the video monitor.
squareness
The alignment of the camera relative to the motion of the metrology stage. If the camera is misaligned (out of square), the image will drift diagonally as the stage position is moved along one axis.
standard
In metrology, an object that has a defined relationship to a unit of measurement of a physical quantity. Standards are the fundamental reference for a system of weights and measures, against which all other measuring devices are compared.
See also linear standard scale.
stitching
The ability to perform accurate measurements my moving the stage to combine (or stitch together) multiple fields of view.
system PC
A space saving personal computer where all electronics, disk drives and I/O connections are in the same enclosure. Also referred to as a small form factor PC.
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