音箱可靠性测试规范docx.docx

音箱可靠性测试规范docx.docx

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音箱可靠性测试规范docx

HARMANINTERNATIONAL

RELIABILITYTESTPLAN

for

AUTOMOTIVEAUDIOSPEAKER

harmanconsumergroup

CentralQualityGroup

ReleaseDate:

2/1/98

RevisionLevel:

K

RevisionLevelDate:

03/31/05

1.0Purpose

Thepurposeofthistestplanistodescribetheenvironmentaiandfunctionalperformaneerequirementstowhichthespeakerwillundergoinordertobevalidated.Theintentofthevalidationprogramistoexposethespeakertoanacceleratedagingprocess.

2.0TestPlan

Thistestplandetailsthetypeoftestsandthenumberofunitsrequiredforeach.ThesamplesizeoutlinedbelowmaychangedependingonReliabilityTarget.

2.1TestImplementation

Thefullqualificationtestprogramconsistsofthegroupslistedbelow.Thisisaparalleltestsequeneesuchthateachgroupisrunindependently.Thistestplanmustbeperformedonatleastonememberofa“ProductFamily”.Themostcomplexorhighestpowermodelshouldbechosen

FullQualificationTestSequence

Group

Quantity

DVPV

TestName

Spec.Sect.No.

FunctionalTestRequirements

A2

6

LifeCycle

5.1

4.4and4.5

B2

6

PowerTest

5.4

4.4and4.5

UVExposureTest

5.8

ImpactTest

5.5「

C2

6

HumidityTest

5.3

4.4and4.5

RandomVibrationTest

5.6

4.4and4.5

D2

*6

PackagingTest（ASTM）

5.7

4.4and4.5

ForPackagesupto150lbs（ASTM4169）

Handling（Drop）,FirstSequence

5.7.1

4.4and4.5

CompressionTest（VehicleStackingAssuranceLevelII）

5.7.2

4.4and4.5

LooseLoadVibration

5.7.3

4.4and4.5

VehicleVibration

5.7.4

4.4and4.5

Handling（Drop）,SecondSequence

5.7.5

4.4and4.5

TemperatureTest

5.2:

4.4and4.5

（1）

ForMasterPackShippingOption（ifavailable）

5.7.9

HumidityStorageTest

5.7.9.1「

LooseLoadVibration

5.7.3

VehicleVibration

5.7.4

*Ifpackagingisavailable.

Note1:

Uniessotherwisespecified,allunitsshallbetestedintheorientationthatunitwillbemountedinthecar.Note2:

TheperformancelimitsoftheunitsundertestwillbespecifiedintheHCGapprovedEngineeringTestSpecification（ETS）[seeSection6].

2.2AbbreviatedQualification

Theabbreviatedtestprogramconsistsofthegroupslistedbelow.Thisisaparalleltestsequencesuchthateachgroupisrunindependently.Thesetestsmustbeperformedonallmembersofa

“ProductFamily”notsubjectedtotheFullQualificationfoundinsection2.1.

AbbreviatedQualificationTestSchedule

Group

DV

PV

TestName

Spec.Sect.No.

FunctionalTestRequirements

ra2

6

LifeCycle

5.1

4.4and4.5

B2

6

PowerTest

5.4

4.4and4.5

HandlingDropTest

5.5

C2*

6

PackagingTest（ASTM）

5.7

4.4and4.5

ForPackagesupto150lbs（ASTM4169）

Handling（Drop）,FirstSequenee

5.7.1

4.4and4.5

CompressionTest（VehicleStackingAssuraneeLevelII）

5.7.2

4.4and4.5

LooseLoadVibration

5.7.3

4.4and4.5

VehicleVibration

5.7.4

4.4and4.5

Handling（Drop）,SecondSequenee

5.7.5

4.4and4.5

*Ifpackagingisavailable.

Note1:

Uniessotherwisespecified,allunitsshallbetestedinthenormalcarmountingorientation.Note2:

TheperformaneelimitsoftheUUTwillbespecifiedintheEngineeringTestSpecification.

3.0StandardTestConditions

3.0.1SignalSource

Uniessotherwisespecified,alltestsshallbeconductedwiththeAudioSignal

Generator/Amplifieroutputconfiguredtobebalaneed,lessthanorequalto50-ohmsourceimpedanee,andfloating.ThesignalsourceGNDshallbeconnectedtothespeakerPWRGNDatthespeaker.

3.0.2Position

Unlessotherwisespecified,thespeakershallmeetallrequirementsinthe“nor

position”.ItisdefinedontheProductSpecificationastothehorizontalorverticalpositionofthemountingsurface.

3.0.3RoomTemperature

Unlessotherwisespecified,allmeasurementsshallbemadeatroomtemperature.Roomtemperatureisspecifiedas2

3.0.4FrequencyRange

Thefrequencyrangeisspecifiedfromthe-3dBpointattheupperandloweroperatingrangeofthedriver.ThisrangeandthelimitswithinthatrangeshallspecifiedontheProductSpecification.

3.0.5Noise

Theproductsaredividedintothreegroups,fullrange（multi-element）,mid-bass,andsubwoofer.ThetypeofproductshallbespecifiedontheProductSpecification.

FullRangewillusetrack13ontheCarAudioTestDiscVersion2.0:

IECnoisewithacrestfactorof9dB.

Mid-basswillusetrack14ontheCarAudioTestDiscVersion2.0:

adecadeofpinknoise,50to500Hz（-3dBpoints）12dBslopes,withacrestfactorof9dB.

Sub-wooferwillusetrack15ontheCarAudioTestDiscVersion2.0:

adecadeofpinknoise,30to300Hz（-3dBpoints）,12dBslopes,withacrestfactorof9dB.

3.0.6MusicSignal

Theproductsaredividedintotwogroups:

1）fullrange（multi-element）andmid-bass,2）subwoofer.ThetypeofproductshallbespecifiedontheProductSpecification.

FullRangeandMid-bass-track16onthCarAudioTestDiscVersion2.0:

“BeatIt”

byMichaelJackson

Sub-woofer-track17onthCarAudioTestDiscVersion2.0:

“CrimeStories”byMC

Hammer

4.0FunctionalRequirements

FunctionalrequirementsaretobetestedinaccordaneewithanHCGapprovedproductengineeringspecification（ETS）.

4.0.1Polarization

WiththedriverfacedownandtheterminalfacingtowardyoutheProductSpecificationshallidentifythepositiveterminal,whichshallbelabeledPin1or“+”.Whenapos

isappliedtothepositiveterminal,theconeshallmoveoutwardfromthebasketproducingpositivepressure.

Ref.IEC268-2

4.0.2DCResistance

Ensurethatthetestleadresistaneeisfactoredoutofthismeasurement.ConnectthetestleadstothespeakerandmeasuretheresistaneeinohmswithanaveragingohmmetertoensurethatambientnoiselevelsdonotproduceanEMFatthemeteryieldingfalseresistancereadings.TheDCRshallbewithinthelimitsspecifiedontheProductSpecification.

4.0.3Impedance

Rigidlysuspendthespeakerfromthemotorstructureinfreeairatleast50cmfromthenearestreflectingsurface.Mountingmeansmustbeminimalinbulksuchthattheairmovementduringtestingissubstantiallyunrestricted.

MeasurethedeviationfromtheReferenceSampleSpeakerimpedanceateachofthedefinedfrequencies.ThedeviationatallfrequenciesshallbewithinthelimitsspecifiedontheProductSpecification.

4.0.4FrequencyResponse

Applyasteppedsinewavesweepor©aneticssignaloverthespecifiedfrequencyrange,usingthespecifiedfrequencyspacing,withthespecifiedbandwidthsmoothingpertheProductSpecification,andanalyzethemicrophoneoutput.Calibratethemeasurementsystemtodisplaythe1Watt1MeterequivalentsensitivitybasedonZomasspecifiedontheProductSpecification.DisplaytheSPLandtheFrequencyinISOstandard25dB/decadeaspectratio.Theresultantgraphofamplitudevs.frequencyisdefinedasthefrequencyresponse.MeasurethedeviationfromtheReferenceSampleSpeakersoundpressurelevelateachofthedefinedfrequencybands.ThedeviationatallfrequenciesshallbewithinthelimitsspecifiedontheProductSpecification.

ToverifythatnodamagehasoccurredtotheRefereneeSampleSpeakerandthatthetestequipmentisfunctioningproperly,thefirstprocessshallbetotesttheRefereneeSampleSpeakeragainstthestoreddatafromthepreviousproductionruns.Ifthereisachangeofmorethanonestandarddeviationatanyfrequency,boththeRefereneeSampleSpeakerandtestequipmentshallbere-calibrated.

4.0.5ExtraneousNoise

Thespeakerassemblyshallnotproduceextraneousnoisewhenadynamictestisperformed.

Thefollowingtypesofdeficienciesaresometypicalcausesofextraneousnoise:

Buzz:

Anynoiseproducedbyaloosenessofcomponentsvibratingagainstothercomponents.

Rub:

Anynoiseproducedbythevoicecoilslidingorrubbingagainstothercomponents.Bottoming:

Thenoiseproducedbythecontactofthemovingsystemwiththespeakerstructure.

Rattle:

Therandomnoiseproducedbyanobjecttrappedwithinthespeakerstrikingmovingcomponentsoranyintermittentnoisecausedbylooseelectricalconnectionsorcontrols.

FrozenCoil:

Abseneeoffreeexcursioncausedbyadhesiveinthemagneticgaporanoffset（loose）componentofmagneticcircuit.

AirNoise:

Thenoiseproducedbyhighvelocityairflowthroughasmallleak.

5.0QualificationTesting

Thereliabilitytargetforallcarspeakerproductsiszerodefectsat50,000milesoperation.Successfulcompletionofthetestisintendedtodemonstrate90%reliabilitywith90%confidenee.

5.1LifeCycle

Eachspeakershallwithstand5cycles（totaling215hours）oftheenvironmentaleonditionsoutlinedbelow.Thespeakersshouldbecheckedonceadayonaregularbasis.Afullfunctionaltestshouldbeperformedonallunitsattheendofthesecondandfifthcycles.

5.1.1LifeCycleCalibration

ThesuppliedCarAudioTestDiscVersion2.0facilitatesaccuratetestlevelcalibrationandtestingeonsistencybyincorporatingsinewavetesttones（firstthreetracks）thatarecalibratedtothemusictracksspecifiedfortesting.

UsingtheRMSnumberfromtheProductSpecificationunderthe“LifeCycle”colu

levelwillbecalibratedwiththeappropriatetesttone（track1forsubwoofers,track2formidbass,andtrack3formulti-elemen