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A Precision Measurement Equipment Laboratory (PMEL) is a United States Air Force (USAF) facility in which the calibration and repair of test equipment takes place. This practice is also known as metrology: the science of measurement. Metrology is defined as the science of weights & measures, while a PMEL is the place where technicians perform ...
Standardized measurements are essential to technological advancement, and early measurement tools have been found dating back to the dawn of human civilization. [1] Early Mesopotamian and Egyptian metrologists created a set of measurement standards based on body parts known as anthropic units. These ancient systems of measurements utilized ...
Producing good measurements is important in industry as it has an impact on the value and quality of the end product, and a 10–15% impact on production costs. [6] Although the emphasis in this area of metrology is on the measurements themselves, traceability of the measuring-device calibration is necessary to ensure confidence in the measurement.
The first CMM was developed by the Ferranti Company of Scotland in the 1950s [1] as the result of a direct need to measure precision components in their military products, although this machine only had 2 axes. The first 3-axis models began appearing in the 1960s (made by DEA of Italy and LK of the UK), and computer control debuted in the early ...
Keesler acquired Chanute's weather forecasting courses and Lowry's meteorology and precision measurement equipment laboratory training programs during 1992 and 1993. Massive restructuring of the Air Force in the early 1990s also meant several changes for Keesler associate units.
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A measurement system analysis (MSA) is a thorough assessment of a measurement process, and typically includes a specially designed experiment that seeks to identify the components of variation in that measurement process. Just as processes that produce a product may vary, the process of obtaining measurements and data may also have variation ...
Micrometer thimble with a reading of 5.779 ± 0.005 mm. (You must enlarge the image to be able to read the scale to its fullest precision.) The reading consists of exactly 5.5 mm from the main scale plus an estimated 0.279 mm from the secondary scale. Assuming no zero error, this is also the measurement.