Equipment Error Definition
Contents |
removed. (June 2015) (Learn how and when to remove this template message) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (December 2009)
Equipment Error Meaning
(Learn how and when to remove this template message) Instrument error refers to the combined error definition chemistry accuracy and precision of a measuring instrument, or the difference between the actual value and the value indicated by the instrument (error). error definition physics Measuring instruments are usually calibrated on some regular frequency against a standard. The most rigorous standard is one maintained by a standards organization such as NIST in the United States, or the ISO in European countries.
Error Computer Definition
However, in physics—precision, accuracy, and error are computed based upon the instrument and the measurement data. Precision is to 1/2 of the granularity of the instrument's measurement capability. Precision is limited to the number of significant digits of measuring capability of the coarsest instrument or constant in a sequence of measurements and computations. Error is ± the granularity of the instrument's measurement capability. Error magnitudes are also added together when making multiple measurements
Percent Error Definition
for calculating a certain quantity. When making a calculation from a measurement to a specific number of significant digits, rounding (if needed) must be done properly. Accuracy might be determined by making multiple measurements of the same thing with the same instrument, and then calculating the result with a certain type of math function, or it might mean for example, a five pound weight could be measured on a scale and then the difference between five pounds and the measured weight could be the accuracy. The second definition makes accuracy related to calibration, while the first definition does not. Removing instrument error[edit] The instrument error is not like random error, that can't be removed. Sometimes the removal of instrument errors are very easy, but it is case dependent. In Engineering instruments, like voltmeter or ammeter for example, the instrument error is very difficult to remove. Ammeter has built in resistance, which can't be removed either way. So the only way is to minimize it. On the other hand, the removal of error of a thermometer is a bit simple. Only the calibration has to be removed and then again calibrate it carefully. Sometimes, the user doesn't care for removal of error from the instrument, else he compensates it in calculation, for example, the zero error in Vernier Caliper
removed. (June 2015) (Learn how and when to remove this template message) This article needs additional citations for verification. experimental error definition Please help improve this article by adding citations to reliable sources.
Relative Error Definition
Unsourced material may be challenged and removed. (December 2009) (Learn how and when to remove this systematic error definition template message) Instrument error refers to the combined accuracy and precision of a measuring instrument, or the difference between the actual value and the value indicated by https://en.wikipedia.org/wiki/Instrument_error the instrument (error). Measuring instruments are usually calibrated on some regular frequency against a standard. The most rigorous standard is one maintained by a standards organization such as NIST in the United States, or the ISO in European countries. However, in physics—precision, accuracy, and error are computed based upon the instrument and the https://en.wikipedia.org/wiki/Instrument_error measurement data. Precision is to 1/2 of the granularity of the instrument's measurement capability. Precision is limited to the number of significant digits of measuring capability of the coarsest instrument or constant in a sequence of measurements and computations. Error is ± the granularity of the instrument's measurement capability. Error magnitudes are also added together when making multiple measurements for calculating a certain quantity. When making a calculation from a measurement to a specific number of significant digits, rounding (if needed) must be done properly. Accuracy might be determined by making multiple measurements of the same thing with the same instrument, and then calculating the result with a certain type of math function, or it might mean for example, a five pound weight could be measured on a scale and then the difference between five pounds and the measured weight could be the accuracy. The second definition makes accuracy related to calibration, while the first definition does not. Removin
the range of meanings. The definitions are taken from a sample of reference sources that represent the scope of the topic of error analysis. Definitions from Webster's dictionary are also http://user.physics.unc.edu/~deardorf/uncertainty/definitions.html included for several of the terms to show the contrast between common vernacular use and the specific meanings of these terms as they relate to scientific measurements. Sources: Taylor, John. An https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/introduction-to-chemistry-1/measurement-uncertainty-30/accuracy-precision-and-error-190-3706/ Introduction to Error Analysis, 2nd. ed. University Science Books: Sausalito, CA, 1997. Bevington, Phillip R. and D. Keith Robinson. Data Reduction and Error Analysis for the Physical Sciences, 2nd. ed. McGraw-Hill: New error definition York, 1992. Baird, D.C. Experimentation: An Introduction to Measurement Theory and Experiment Design, 3rd. ed. Prentice Hall: Englewood Cliffs, NJ, 1995. ISO. Guide to the Expression of Uncertainty in Measurement. International Organization for Standardization (ISO) and the International Committee on Weights and Measures (CIPM): Switzerland, 1993. Fluke. Calibration: Philosophy and Practice, 2nd. ed. Fluke Corporation: Everett, WA, 1994. Webster's Tenth New Collegiate Dictionary, Merriam-Webster: equipment error definition Springfield, MA, 2000. Notes: Many of the terms below are defined in the International Vocabulary of Basic and General Terms in Metrology (abbreviated VIM), and their reference numbers are shown in brackets immediately after the term. Since the meaning and usage of these terms are not consistent among other references, alternative (and sometimes conflicting) definitions are provided with the name and page number of the reference from the above list. Comments are included in italics for clarification. References are only cited when they explicitly define a term; omission of a reference for a particular term generally indicates that the term was not used or clearly defined by that reference. Even more diverse usage of these terms may exist in other references not cited here. uncertainty (of measurement) [VIM 3.9] parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand. The uncertainty generally includes many components which may be evaluated from experimental standard deviations based on repeated observations (Type A evaluation) or by standard deviations evaluated from assumed probability distributions based on experience or other informati
Chemistry Chemistry Textbooks Boundless Chemistry Chemistry Textbooks Chemistry Concept Version 17 Created by Boundless Favorite 2 Watch 2 About Watch and Favorite Watch Watching this resources will notify you when proposed changes or new versions are created so you can keep track of improvements that have been made. Favorite Favoriting this resource allows you to save it in the “My Resources” tab of your account. There, you can easily access this resource later when you’re ready to customize it or assign it to your students. Accuracy, Precision, and Error Read Edit Feedback Version History Usage Register for FREE to remove ads and unlock more features! Learn more Register for FREE to remove ads and unlock more features! Learn more Assign Concept Reading View Quiz View PowerPoint Template Accuracy is how closely the measured value is to the true value, whereas precision expresses reproducibility. Learning Objective Describe the difference between accuracy and precision, and identify sources of error in measurement Key Points Accuracy refers to how closely the measured value of a quantity corresponds to its "true" value. Precision expresses the degree of reproducibility or agreement between repeated measurements. The more measurements you make and the better the precision, the smaller the error will be. Terms systematic error An inaccuracy caused by flaws in an instrument.
Precision Also called reproducibility or repeatability, it is the degree to which repeated measurements under unchanged conditions show the same results. Accuracy The degree of closeness between measurements of a quantity and that quantity's actual (true) value. Register for FREE to remove ads and unlock more features! Learn more Full Text Accuracy and PrecisionAccuracy is how close a measurement is to the correct value for that measurement. The precision of a measurement system is refers to how close the agreement is between repeated measurements (which are repeated under the same conditions). Measurements can be both accurate and precise, accurate but not precise, precise but not accurate, or neither. High accuracy, low precision On this bullseye, the hits are all close to the center, but none are close to each other; this is an example of accuracy without precision. Low accuracy, high precision On this bullseye, the hits are all close to each other, but not near the center of the bullseye; this is an example of precision without accuracy. Precision is sometimes separated into: Re