INDUSTRY NEWS
Self calibration of measuring units increases accuracy of measurements
measurement deviations on the measuring unit.
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During the calibration, no technical intervention occurs at the measuring instrument, as opposed instrument is set, or, adapted to keep the measurement errors as small as possible. Or, that the number of measurement errors do not exceed the error limits. The unit is carried out according to the rules and regulations of the examining authority, and the unit is marked with the respective stamp. The examining authority establishes whether the respective respective prerequisites. The validity of a calibration period follows practical requirements such as manufactures information, requirements of quality standards or company internal and customer time period validity for use. In order to be able to compare results of measurement, it must be possible to «feedback»
alibration in measurement technology means establishing the
information via a chain of comparison measurements to a national or international master. For this purpose, the display of the measuring unit in use or the material representation must be compared with the masters in one or more stages. On each of these stages a calibration is carried out with a master which has been previously calibrated with a higher-level master. According to the ranking of the master – of consumption or factory standards via reference masters up to national standards – there is a calibration hierarchy of points to be carried out. This extends from the in-house calibrating laboratory through accredited calibrating laboratories up to the national metro-logical institute.
and guidelines are valid for the expert carrying out of requirements before a unit can be calibrated. One must also be aware of the physical conditions required in order to carry out a calibration and observe them. Rules for the calibration of instruments are essential when a company decides or guideline or if it produces a product whose production is
Standards and regulations, becoming more important for quality assurance in all industrial nations. Then it may be explicitly required to calibrate all test equipment that directly or of the product. This includes, for example, test equipment that are used as references during the production process. The Zumbach standards and guidelines of quality assurance. The regulations of the FDA (American Food and Drug Administration), for example, are important worldwide in respect of international trading relations. The demands that «devices, apparatus, measuring instruments and recording devices be calibrated at suitable intervals in agreement with an in writing created program schedules, limits and accuracy and precautions for remedial actions if accuracy and/or limits are not similar requirements. Example of a Zumbach measuring unit - Our measuring units are calibrated using reference
www.internationalmetaltube.com
(
www.metas.ch) or by accredited laboratories. Each unit is supplied with a detailed calibration protocol.
A regular check for measuring errors along with the
corresponding protocol can be carried out according to the customer requirements. The regularity of these calibrations is dependent on the customer regulations). We recommend a months.
All the measuring heads of the makes a subsequent, regular when exchanging components. All the relevant parameters for accuracy are continuously monitored by the measuring system and automatically compensated when required. This is particularly important for scanner motor or the possible long-term drift of the measuring electronics.
More information on Zumbach Electronics AG
www.zumbach.com
IMT August/September 2014 13
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