Meaning measurement
Measurement is part of the Science Process Skills which is a collection of information, both quantitative and qualitative. By performing the measurement, can be obtained magnitude or value of a quantity or qualitative evidence. In Physics science learning, an educator not only deliver a collection of facts alone but should teach science as a process (process approach). Therefore, doing science experiments or experiments in Physics is very important. Conduct experiments in the laboratory, means deliberately evoke symptoms then take measurements of natural phenomena
Precision and Accuracy of Measurement
Accuracy (accuracy). If a quantity is measured several times (multiple measurements) and produce prices are spread around the actual price then said akurat.Ketelitian measurement (precision) .If centralized measurement results in a specified area then called the measurement precision (the price is not much different measurements ). Uncertainty Measurement Uncertainty (error) collection system will lead to the results obtained deviate from the actual results. Sources of uncertainty this collection system include: a. Error calibration tool; can be determined by comparing it with other devices. b. Zero point error (KTN) c. Damage to equipment components, such as springs that have been used so it is not elastic anymore d. Friction e. Parallax error f. Errors due to the current state of the work, when the instrument is calibrated conditions different from the conditions at the time the tool works. The uncertainty of a Random (random) This error comes from the symptoms that may not be controlled or overcome such changes are so rapid that beyond the means of controlling and regulating. Sources of uncertainty include random; a. Error estimate the scale part b. Fluctuating state, meaning that the rapidly changing circumstances of the time. c. Random motion of air molecules. This motion resulted in the appointment of the gauge needle is very fine concentrated disturbed. d. The foundation of a vibrating e. Noise (noise), interference with the electronic device in the form of rapid fluctuations in voltage due to component tool increasing its temperature. f. Background radiation such as cosmic radiation from outer space. Measurement Uncertainty Analysis A measure is always accompanied by ketidakpastian.Beberapa cause of these uncertainties include NST (smallest scale value), calibration error, zero-point error, parallax error, friction, fluctuations in measurement parameters and the environment affect each other as well as the skill of the observer.
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