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Measurement: Measurements
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Measurement of a dynamic system requires a thorough understanding of the methodology, the assumptions and the limitations of each measuring technique. Measurement associates assist businesses and institutions discover and implement best practices for acquiring information for data driven decisions.
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[I]f the value is given as 2.132836, this might lead to inaccuracies at some point when the measurement is factored into other equations. The 6, in fact, should be "rounded off" to a 7. Simple rules apply to the rounding off of significant figures: if the digit following the first uncertain number is less than 5, there is no need to round off. Thus, if the measurement had been 2.13283627 kg (note that the 9 was changed to a 2), there is no need to round off, and in this case, the figure of 2.132836 is correct. But since the number following the 6 is in fact a 9, the correct significant figure is 7; ... the total would be 2.132837.
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Technical note: NACCB's IT Employment Index is the first specific measurement of IT employment. This unique measurement of total IT employment is created monthly by studying the ongoing staffing patterns of a dozen IT and computer related occupations in 16 industries and industry sectors employing significant numbers of IT workers including the manufacturing, wholesale and retail trade, financial, information services, business and professional services, and education and health industries. The monthly IT Employment Index is based on U.S. Bureau of Labor Statistics (BLS) data, which is subject to monthly revisions, and therefore, the Index is revised accordingly. The IT Employment Index is ... subject to annual revisions and will be benchmarked next month (February 2008) with the publication of the BLS January 2008 employment report, which is expected to include revisions to 2007 employment data.
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The ATS-2 is a PC-based audio test and measurement system. Analysis capabilities include harmonic distortion, FFT and multitone analyzers. The Harmonic Distortion Analyzer decreases an engineer or technician's test time by quickly isolating and identifying circuit problems. The Multitone Analyzer enables fast analysis of frequency response, crosstalk, noise and distortion -- eliminating errors, improving accuracy and reducing costs associated with test time. This series of performance tests is carried out in less than one second with a single acquisition. Audio Precision ... offers a performance option that increases measurement bandwidth to 120 kHz and includes complete digital audio interface tests including waveform and eye pattern displays.
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Integral to process control in many industries, level measurement sensors fall into two main types. Point level measurement sensors are used to mark a single discrete liquid height–a preset level condition. Generally, this type of sensor functions as a high alarm, signaling an overfill condition, or as a marker for a low alarm condition. Continuous level sensors are more sophisticated and can provide level monitoring of an entire system. They measure fluid level within a range, rather than at a one point, producing an analog output that directly correlates to the level in the vessel. To create a level management system, the output signal is linked to a process control loop and to a visual indicator.
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Accuracy is a measure of the magnitude of error between the result of a measurement and the true thickness of the item being measured. An accuracy statement predicts the ability of a coating thickness gage to measure the true thickness of a coating to be measured. Accuracy statements provide the performance capability across the full functional measurement range of the gage. Often the measurement range is split into two sections ranging from 0 to a fixed value; and then everything greater than that fixed value (up to the gage's measurement limit). Accuracy statements frequently include a fixed portion that remains constant across the measurement range, plus a variable portion that is related to the measurement result for a particular thickness. Such accuracy statements are critical since those with no fixed value imply an exact measurement at zero.
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