About: Measurement microphone calibration

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In order to take a scientific measurement with a microphone, its precise sensitivity must be known (in volts per pascal). Since this may change over the lifetime of the device, it is necessary to regularly calibrate measurement microphones. This service is offered by some microphone manufacturers and by independent testing laboratories. Microphone calibration by certified laboratories should ultimately be traceable to primary standards a (National) Measurement Institute that is a signatory to International Laboratory Accreditation Cooperation. These could include the National Physical Laboratory in the UK, PTB in Germany, NIST in the USA and the National Measurement Institute, Australia, where the reciprocity calibration (see below) is the internationally recognised means of realising th

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rdfs:label	Measurement microphone calibration (en)
rdfs:comment	In order to take a scientific measurement with a microphone, its precise sensitivity must be known (in volts per pascal). Since this may change over the lifetime of the device, it is necessary to regularly calibrate measurement microphones. This service is offered by some microphone manufacturers and by independent testing laboratories. Microphone calibration by certified laboratories should ultimately be traceable to primary standards a (National) Measurement Institute that is a signatory to International Laboratory Accreditation Cooperation. These could include the National Physical Laboratory in the UK, PTB in Germany, NIST in the USA and the National Measurement Institute, Australia, where the reciprocity calibration (see below) is the internationally recognised means of realising th (en)
dcterms:subject	Sound technology Acoustics
Wikipage page ID	28022494 (xsd:integer)
Wikipage revision ID	1057421368 (xsd:integer)
Link from a Wikipage to another Wikipage	Primary standard Volts International Laboratory Accreditation Cooperation Mass Ohm Frequency NIST Critical distance Anechoic chamber Calibration Sound technology Brüel & Kjær Adiabatic Time Dissemination Acoustics Pascal (unit) Diaphragm (acoustics) Length Frequency spectrum Acoustic impedance Physikalisch-Technische Bundesanstalt Piston Microphone National Measurement Institute, Australia National Physical Laboratory (United Kingdom) Sound pressure level Sensitivity (electronics) Volt Condenser microphones Specific heat Uncertainty of measurement Adiabiatic A weighting
sameAs	Measurement microphone calibration Measurement microphone calibration Measurement microphone calibration Measurement microphone calibration
dbp:wikiPageUsesTemplate	dbt:No_footnotes dbt:Refbegin dbt:Refend dbt:Visible_anchor
has abstract	In order to take a scientific measurement with a microphone, its precise sensitivity must be known (in volts per pascal). Since this may change over the lifetime of the device, it is necessary to regularly calibrate measurement microphones. This service is offered by some microphone manufacturers and by independent testing laboratories. Microphone calibration by certified laboratories should ultimately be traceable to primary standards a (National) Measurement Institute that is a signatory to International Laboratory Accreditation Cooperation. These could include the National Physical Laboratory in the UK, PTB in Germany, NIST in the USA and the National Measurement Institute, Australia, where the reciprocity calibration (see below) is the internationally recognised means of realising the primary standard. Laboratory standard microphones calibrated using this method are used in-turn to calibrate other microphones using comparison calibration techniques (‘secondary calibration’), referencing the output of the ‘test’ microphone against that of the reference laboratory standard microphone. A microphone’s sensitivity varies with frequency (as well as with other factors such as environmental conditions) and is therefore normally recorded as several sensitivity values, each for a specific frequency band (see frequency spectrum). A microphone’s sensitivity can also depend on the nature of the sound field it is exposed to. For this reason, microphones are often calibrated in more than one sound field, for example a pressure field and a free field. Depending on their application, measurement microphones must be tested periodically (every year or several months, typically), and after any potentially damaging event, such as being dropped or exposed to sound levels beyond the device’s operational range. (en)
prov:wasDerivedFrom	wikipedia-en:Measurement_microphone_calibration?oldid=1057421368&ns=0
page length (characters) of wiki page	9881 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Measurement_microphone_calibration
is Link from a Wikipage to another Wikipage of	Pistonphone Reverberation room Microphone Plane wave tube Measurement Microphone Calibration Noise dosimeter
is Wikipage redirect of	Pistonphone Measurement Microphone Calibration
is foaf:primaryTopic of	wikipedia-en:Measurement_microphone_calibration

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