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200V极化电压
Type4191isdesignedforhigh-precision,free-fieldmeasurementswhereawidebandwidthisrequired.Beingexternallypolarized,Type4191mustbeusedwithaclassicalpreamplifier.
Uses
Features
Useoffree-fieldmicrophonesAthigherfrequenciesreflectionsanddiffractionscausesapressureincreaseinfrontofthediaphragmofamicrophone.Ifnotcorrectedfor,thiswouldresultinanincreasedoutputvoltage.Afree-fieldoptimisationmeansthatthefrequencyresponseofthemicrophonehasbeendesignedinsuchawaythatthefree-fieldresponseat0degreesincidenceisflat.Thismicrophoneisoptimisedforusewiththeprotectiongridinplace.
Free-fieldmicrophonesarecommonlyusedforsoundmeasurementinananechoicchamberorfarawayfromreflectingbuildings,etc.Anotherareaforfree-fieldmicrophonesisforgeneralelectroacousticmeasurementslikeloudspeakerandmicrophonemeasurements.
Withanupperfrequencyof40kHz,Type4191isespeciallysuitedallhigh-precisionelectroacousticmeasurementsaswellasgeneralacousticmeasurementswherearobustandstablefree-fieldmicrophoneisrequired.Despitethe40kHzupperfrequency,thismicrophoneisoptimisedtooperatewiththeprotectiongridinplace.
Apress-fitted,stainless-steeldiaphragmensuressuperiorlong-termstabilityandmechanicalrobustness–Type4191willwithstandthe1mdroptestofIEC60068–2–32.
AllBrüel&KjrMeasuringMicrophonesareassembledinacleanroom.Thisensuresthatthemicrophonesmaintaintheirinherentlownoisefloorandhighstability,evenwhenusedinenvironmentswithacombinationofhighhumidityandhightemperature.
Type4191requiresanexternalpolarizationvoltageandmustthereforebeusedwithaclassicalpreamplifier.Externallypolarizedmicrophonesmaybeusedathighertemperatureswithoutseverechangesinsensitivity.
Type4191isavailableinTEDScombinationswiththeclassicalMicrophonePreamplifierType2669.TheTEDSmicrophoneisconsideredoneunitandhasbeensealedinacleanenvironment.TheTEDSisprogrammedwiththeloadedsensitivityoftheactualcartridgeandthedataisthereforereadilyavailable.ThedefaultTEDStemplateistoIEEEP1451.4butTEDStoIEEE1451.4isavailableonrequest.