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The Process Of Calibration And Calibration Services

Jan 20, 2008
The word calibration is associated with the concepts of accuracy of standard or measuring instrument where measurement error and uncertainty are dealt with.

In order to establish the relation between the values indicated by the instrument and those of the standard, a measuring instrument is compared with a measurement standard with the help of a process called calibration.

Calibration involves comparing of a measurement device that is unknown, against the better standard. Calibration is often considered as something that includes the process of adjusting the output/indication on a measurement instrument to meet the value of the applied standard within accuracy. Let's take an example of thermometer that indicates errors. This indication of errors in thermometer can be corrected and adjusted using calibration constants. As a result, it will show the true temperature in Celsius at specific points on the scale. In computing, by way of proper calibration of an interactive white board pen or other input method the relation between the physical pen position and the position of the cursor on the screen is established.

In order to provide confidence in the accuracy of calibration results, there has to be demonstrable traceability. That means the results achieved through calibrating measurement standard used has be traceable back to standards (held at a national measurement institute) through an unbroken chain of comparisons where each link has declared a kind of measurement uncertainties. Trained and authorized personnel have to use appropriate equipment and procedures in the calibration process. Traceability was greatly emphasized. Organizations, documents, measurements and techniques within a large and diverse measurement community fall into the concept of traceability. For this reason it becomes important to be systematic to interact with each other or with our clients.

The topics of measurement traceability, quality assurance programs etc, are normally linked to the topics of measurement uncertainty by modern metrological notions. The employment of calibrated standards or instruments is an essential component of uncertainty budget. A reference value, i.e. an International System (IS) unit, which can be transferred by the calibration process to the instrument/artifact under calibration process that creates the unbroken chain of comparisons required for traceability.

It is little bit confusing to say whether they are simple devices or up to date systems. They normally have to be calibrated, because calibration is the only process that determines the measurement capabilities of the instruments.
About the Author
This article is published by RS Calibration Services, Inc. in public interest. RS Calibration is one of the leading Northern California Calibration Services providers. They are also one of the leading Bay Area Calibration Companies.
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