Curtis Instruments 1232 User Manual

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#ONDUCTEDPATHSARECREATEDBYTHEWIRESCONNECTEDTOTHECONTROLLER
4HESEWIRESACTASANTENNASANDTHEAMOUNTOF2&ENERGYCOUPLEDINTOTHEM
ISGENERALLYPROPORTIONALTOTHEIRLENGTH4HE2&VOLTAGESANDCURRENTSINDUCED
INEACHWIREAREAPPLIEDTOTHECONTROLLERPINTOWHICHTHEWIREISCONNECTED
#URTIS CONTROLLERS INCLUDE BYPASS CAPACITORS ON THE PRINTED CIRCUIT BOARDS
THROTTLEWIRESTOREDUCETHEIMPACTOFTHIS2&ENERGYONTHEINTERNALCIRCUITRY
)NSOMEAPPLICATIONSADDITIONALlLTERINGINTHEFORMOFFERRITEBEADSMAYALSO
BEREQUIREDONVARIOUSWIRESTOACHIEVEDESIREDPERFORMANCELEVELS
2ADIATEDPATHSARECREATEDWHENTHECONTROLLERCIRCUITRYISIMMERSEDIN
ANEXTERNALlELD4HISCOUPLINGCANBEREDUCEDBYPLACINGTHECONTROLLERASFAR
ASPOSSIBLEFROMTHENOISESOURCEORBYENCLOSINGTHECONTROLLERINAMETALBOX
3OME#URTISCONTROLLERSAREENCLOSEDBYAHEATSINKTHATALSOPROVIDESSHIELDING
AROUNDTHECONTROLLERCIRCUITRYWHILEOTHERSAREPARTIALLYSHIELDEDORUNSHIELDED
)NSOMEAPPLICATIONSTHEVEHICLEDESIGNERWILLNEEDTOMOUNTTHECONTROLLER
WITHINASHIELDEDBOXONTHEENDPRODUCT4HEBOXCANBECONSTRUCTEDOFJUST
ABOUTANYMETALALTHOUGHSTEELANDALUMINUMAREMOSTCOMMONLYUSED
-OSTCOATEDPLASTICSDONOTPROVIDEGOODSHIELDINGBECAUSETHECOATINGS
ARENOTTRUEMETALSBUTRATHERAMIXTUREOFSMALLMETALPARTICLESINANONCON
DUCTIV
EBINDER
4HESERELATIVELYISOLATEDPARTICLESMAYAPPEARTOBEGOODBASED
ONADCRESISTANCEMEASUREMENTBUTDONOTPROVIDEADEQUATEELECTRONMOBILITY
TOYIELDGOODSHIELDINGEFFECTIVENESS%LECTROLESSPLATINGOFPLASTICWILLYIELDA
TRUEMETALAND CANTHUSBEEFFECTIVEASAN2& SHIELDBUTITISUSUALLY MORE
EXPENSIVETHANTHECOATINGS
!CONTIGUOUSMETALENCLOSUREWITHOUTANYHOLESORSEAMSKNOWNASA
&ARADAYCAGEPROVIDESTHEBESTSHIELDINGFORTHEGIVENMATERIALANDFREQUENCY
7HENAHOLEORHOLESAREADDED2&CURRENTSmOWINGONTHEOUTSIDESURFACEOF
THESHIELDMUSTTAKEALONGERPATHTOGETAROUNDTHEHOLETHANIFTHESURFACE
WASCONTIGUOUS!SMOREhBENDINGvISREQUIREDOFTHESECURRENTSMOREENERGY
ISCOUPLEDTOTHEINSIDESURFACEANDTHUSTHESHIELDINGEFFECTIVENESSISREDUCED
4HEREDUCTIONINSHIELDINGISAFUNCTIONOFTHELONGESTLINEARDIMENSIONOFA
HOLERATHERTHANTHEAREA4HISCONCEPTISOFTENAPPLIEDWHEREVENTILATIONIS
NECESSARYINWHICHCASEMANYSMALLHOLESAREPREFERABLETOAFEWLARGERONES
!PPLYINGTHISSAMECONCEPTTOSEAMSORJOINTSBETWEENADJACENTPIECESOR
SEGMENTSOFASHIELDEDENCLOSUREITISIMPORTANTTOMINIMIZETHEOPENLENGTH
OFTHESESEAMS3EAMLENGTHISTHEDISTANCEBETWEENPOINTSWHEREGOODOHMIC
CONTACTIS MADE4HIS CONTACTCAN BEPROVIDEDBYSOLDERWELDSOR PRESSURE
CONTACT)FPRESSURECONTACTISUSEDATTENTIONMUSTBEPAIDTOTHECORROSION
CHARACTERISTICSOFTHESHIELDMATERIALANDANYCORROSIONRESISTANTPROCESSESAPPLIED
TOTHEBASEMATERIAL)FTHEOHMICCONTACTITSELFISNOTCONTINUOUSTHESHIELDING
EFFECTIVENESSCANBEMAXIMIZEDBYMAKINGTHEJOINTSBETWEENADJACENTPIECES
OVERLAPPINGRATHERTHANABUTTED
4HESHIELDINGEFFECTIVENESSOFANENCLOSUREISFURTHERREDUCEDWHENAWIRE
PASSESTHROUGHAHOLEINTHEENCLOSURE2&ENERGYONTHEWIREFROMANEXTERNAL
lELDISRERADIATEDINTOTHEINTERIOROFTHEENCLOSURE4HISCOUPLINGMECHANISM
CANBEREDUCEDBYlLTERINGTHEWIREWHEREITPASSESTHROUGHTHESHIELDBOUNDARY
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Curtis Instruments 1232 Specifications

General

Brand	Curtis Instruments
Model	1232
Category	Controller
Language	English