AVX System User Guide
magnification, lens
In a vision metrology system, the image size in the CCD plane divided by the corresponding object size.
MetLogix M3 software
Advanced metrology software for performing two and three axis measurements in encoder-based systems and field of view systems at high levels of precision and accuracy. M3 software is included with AVX systems.
National Institute of Standards and Technology (NIST)
A physical sciences laboratory and a non-regulatory agency of the United States Department of Commerce. Its mission is to promote innovation and industrial competitiveness. NIST's activities are organized into laboratory programs that include nanoscale science and technology, engineering, information technology, neutron research, material measurement, and physical measurement.
NIST
See National Institute of Standards and Technology.
parcentricity
The condition where a feature remain at the optical center of the video image throughout the magnification range of zoom optics.
parfocality
The condition where the video image remains in focus as the magnification is adjusted from highest to lowest with zoom optics.
pixel
A picture element. Term used to describe the individual light detectors of the CCD sensor in the camera and the individual light emitters of an LCD video monitor.
resolution
The least significant digit to which a physical quantity can be read. High resolution does not imply high accuracy.
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.
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.
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