Impedance Stabilisation Networks (ISN,阻抗稳定网络) Introduce课件

MeasurementofdisturbancesatTelecommunicationports

perCISPR22/EN55022:1998

partI

UweKarsten

SCHAFFNERMEBBERLINGMBHLandsbergerStraße255D-12623Berlin,GermanyCISPR22/EN55022:98”Informationtechnologyequipment(ITE)-Radiodisturbancecharacteristics-Limitsandmethodsofmeasurement”New:requirements ontelecommunicationportsWhatisanITE?

InformationTechnologyEquipment-whichhasaprimaryfunctionofeither entry, storage, display, retrieval, transmission, processing, switchingor controlofdataandoftelecommunicationmessages;-witharatedsupplyvoltagenotexceeding600V.ClassificationofITELimitsforconductedandradiateddisturbancestobefixedasQPorAVvaluesdependentfromenvironmentClassB - Equipmentisintendedprimarilyforuse indomesticenvironmentClassA - allotherITEMethodsofmeasurementMeasurementofradiateddisturbances

-inthefrequencyrange30MHz-1GHz -byusingantennasandreceiversacc.CISPR16-1

onOpenAreaTestSitesOATS(reference) oralternativetestsites

-externalI/O-cablemaybeterminated withArtificialMainsNetworks(AMN,LISN)and ImpedanceStabilisationNetworks(ISN) asterminatingimpedanceReceiverEUTISNAMNMeasurementofconducteddisturbancevoltage

-atthemainports

-inthefrequencyrange150kHz-30MHz

-byusingArtificialMainsNetworks

(AMN,LISN)andanEMI-receiver

MethodsofmeasurementReceiverAMNEUT110/230VMethodsofmeasurementMeasurementofconducteddisturbancevoltagesorcurrents

-attelecommunicationports!new!

-inthefrequencyrange150kHz-30MHz -byusing ISN(impedancestabilizationnetwork),

CDN(couplingdecouplingdevice),

CVP(capacitivevoltageprobe), and/orcurrentprobeandan EMI-receiverReceiverISN/CDNEUTAEcurrentprobeCVPTechnologiesofdatatransferPOTS(PlainOldTelephoneService)ISDN-(IntegratedServicesDigitalNetwork)ATM-(AsyncronousTransferModus)ADSL(AsymmetricalDigitalSubscriberLine)VDSL(Very-high-bit-rateDigitalSubscriberLine)FDDI(FibreDistributedDataInterface),withwire-boundedenduserconnectioni.e.: TokenRing, 10BaseTand 100BaseT

VoltagelimitsdBµVCurrentlimitsdBµALimitsofconductedcommonmode(asymmetricmode)disturbanceattelecommunicationportsforclassBequipmentISN

commonmodeterminationimpedancefrequencyrange: 0,15MHzto30MHzimpedance: 150±20phaseangle: 0°±20°

atleast10dBbelowtherelevantdisturbancelevelprefered:55dBISNisolatethe

commonmodedisturbances

betweenEUTandAEorload35dB1,5MHzISN

coupletheRF-commonmode

disturbancevoltages

tothereceiverdividingfactor: 9,51dBu0100Ohm(ISN)50OhmreceiverISN

shellnotsignificantlyaffect

thenormalquality

ofthewantedsignal

-lowinsertionloss,

-lowcrosstalk,

-highbandwidthAlternative1:...UseanISNwithalongitudinalconversionlossof80/55dB;incaseofdisputesuseISNforcat.3/5Alternative2:...forportsintendedtobeconnectedtocat.3/5cablesusetheappropiateISNofcategory3/5“TheLCLofasignalport,cable,ornetworkcausesaportionofanydifferentialsignals...tobeconvertedtocommonmodedisturbances...“goodsignalport+goodcable+goodnetwork=largeLCLMethodsofconformancetestingattelecommunicationportswithoneortwounscreenedline-pairs(9.5.2):

realisedthedefined

longitudinalconversionloss(LCL)ISN

realisedthedefined

longitudinalconversionloss(LCL)

attheEUT-portconformancealternative80/55dB13260/35dB->cat.5cables50/25dB->cat.3cablesMeasurementofdisturbancesatTelecommunicationports

perCISPR22/EN55022:1998

partII

UweKarsten

SCHAFFNERMEBBERLINGMBHLandsbergerStraße255D-12623Berlin,Germanyalternativetestset-upISN+4additionaltestset-upsWhydifferentmethodsformeasurementofconductedasymmetricaldisturbances?1)Differentkindsofportsforsingleunscreenedbalancedpairtwosingleunscreenedbalancedpairsmorethantwosingleunscreenedbalancedpairsunsymmetricallinesscreenedcables2)ISN/CDNarenotapplicableinfluenceonthedatatransmissionimpossibletocutthelineAlternative1:...UseanISNwithalongitudinalconversionlossof80/55dB;incaseofdisputesuseISNforcat.3/5Alternative2:...forportsintendedtobeconnectedtocat.3/5cablesusetheappropiateISNofcategory3/5Methodsofconformancetestingattelecommunicationportswithoneortwounscreenedline-pairs(9.5.2):

MeasurementofdisturbancesattelecommunicationportsIftheISN'sdefinedin9.5.2arenotavailable,themeasurementsarepossiblewithfollowingmethods:useofapplicableCDN/ISNasperIEC1000-4-6:C.1.1-ReceiverSCR31xx-CDNST08-(SMZ11)-ISNT2/T4xx-SMZ11Useforallkindsofscreenedcables:C.1.2

-Receiver-CurrentProbe-InjectionClamp,-SignalGenerator,-FerriteClamps,150/50Ohm,Adaptor10050receiverUseifothermethodsarenotapplicable

C.1.4

-ReceiverSCR31xx,-SMZ11,-InjectionClamp,-SignalGenerator,-FerriteClampscomponetsforaTestsetupwithISNReceiverISN/CDNEUTAEsamplesofISN-typesmanydifferentkindsofImpedanceStabilisationNetworks,

fordifferentapplicationswith3differentLCL

Type Application Conn.Pin-arrangement a1b1a2b2T4

GermanTelecom,US-standard,Siemens RJ115 243 ISDNbasicrateaccess,(S0) RJ454536 ISDNprimaryrateaccess(2Mbps) RJ454512

10BaseT,100BaseTRJ451236

ATM,FDDI RJ451 278T2 GermanTelecom,Siemens(UP0) RJ453,45,6--Solution:

2BasicISNwithadapters,preparedforthemostimportantinterfaceconfigurationsofRJ11/45connectorsaswellasoneT2/T4-customertailoredversion.ISNsetforoneortwounshieldedtwistedpairslines

ST-CDNforscreenedlinesDisturbancesignalcouplingisperformedintheCDNST08viaa100Ohm-resistorontothescreen(shield)ofthecable

Fourpairsoflinesinsidethescreenprovideatransmissionbandwidthof>80MHzaswellasallrequiredcouplinganddecouplingparametersforthesignal-andthedisturbancepath

ThesignalpathisestablishedbyscreenedRJ45-adaptersST-CDNforscreenedlinesCDNST08CurrentprobeCurrentprobe,passive,screenedwithEMImeasuringreceiverfornon-contactmeasuringofcommonmodedisturbancecurrentsCurrentprobeSMZ11Measurementwith50Ohmreceiver: I[dBuA]=U[dBuV]+K[dBS]Max.powerlinecurrent: 25Amp(DCto400Hz)CapacitiveVoltageProbeCVPActivevoltagemeasuringclamp,shieldedwithEMImeasuringreceiverfornon-contactmeasuringofunbalanceddisturbancevoltages

FixturesforthecableRF-outputchangeableBatteryswitcheablesensitivityCapacitiveVoltageProbeCVPCalibration-KitBattery-chargerExternalpowersupplyBNC-interconnectioncableind