BIRD 8325 Owner's manual

Brand: BIRD

Model: 8325

Type: Owner's manual

8320 SERIES

TENULINE

ATTENUATOR

Operation Manual

by Bird Technologies, Inc

Instruction Book Part Number 920-8320S Rev. B

Tenuline

® is a registered trademark

of Bird Electronic Corporation

Safety Precautions

Thefollowingaregeneralsafetyprecautionsthatarenotnecessarilyrelatedto

anyspecificpartorprocedure,anddonotnecessarilyappearelsewhereinthis

publication.Theseprecautionsmustbethoroughlyunderstoodandapplytoall

phasesofoperationandmaintenance.

WARNING

KeepAwayFromLiveCircuits

OperatingPersonnelmustatalltimesobservegeneralsafetyprecautions.Do

notreplacecomponentsormakeadjustmentstotheinsideofthetest

equipmentwiththehighvoltagesupplyturnedon.Toavoidcasualties,always

removepower.

WARNING

ShockHazard

DonotattempttoremovetheRF

transmissionlinewhileRFpowerispresent.

WARNING

DoNotServiceOrAdjustAlone

Undernocircumstancesshouldanypersonreachintoanenclosureforthe

purposeofserviceoradjustmentofequipmentexceptinthepresenceof

someonewhoiscapableofrenderingaid.

WARNING

SafetyEarthGround

Anuninterruptibleearthsafetyground

mustbesuppliedfromthemain

powersourcetotestinstruments.Groundingoneconductorofatwo

conductorpowercableisnotsufficientprotection.Seriousinjuryordeathcan

occurifthisgroundingisnotproperlysupplied.

WARNING

Resuscitation

Personnelworkingwithornearhighvoltagesshouldbefamiliarwithmodern

methods

ofresuscitation.

WARNING

RemovePower

Observegeneralsafetyprecautions.Donotopentheinstrumentwiththe

powerapplied.

SafetyPrecautions

Safety Symbols

Note: Callsattentiontosupplementalinformation.

WARNING

Warningnotescallattentiontoaprocedure,whichifnotcorrectlyperformed,

couldresultinpersonalinjury.

CAUTION

Cautionnotescallattentiontoaprocedure,whichifnotcorrectlyperformed,

couldresultindamagetotheinstrument.

Thecautionsymbolappearsontheequipmentindicatingthereis

importantinformationintheinstructionmanualregardingthat

particulararea

8320SeriesTenuline®Attenuator

iii

Warning Statements

Thefollowingsafetywarningsappearinthetextwherethereisdangerto

operatingandmaintenancepersonnel,and arerepeatedhereforemphasis.

Seepages

and

Seepages

,

,and

.

Seepage

WARNING

Theventplugmustbeinstalledatalltimeswhentheunitisinoperationor

cooling.Alwayschecktoensureventplugisinstalledpriortooperation.

Failuretodothiscouldresultindamagetotheequipmentandendangerthe

operator’ssaf ety.

WARNING

LeakingRFenergyisapotentialhealth

hazard.

Neverattempttoconnectordisconnectequipmentfromthetransmission

linewhileRFpowerisbeingapplied.

Severeburns,electricalshock,ordeathcanoccur.

WARNING

Usingtheattenuatorintheupperendofitspowerdissipationrangewillcause

thehousingtobecomehot!

Careshouldbeexercisedintouching

them.

SafetyPrecautions

Caution Statements

Thefollowingequipmentcautionsappearinthetextwhenevertheequipmentis

indangerofdamage,andarerepeatedhereforemphasis.

CAUTION

Seepag

e

Seepages

and

.

Seepage

TheAtt

enuatorisdesignedtobeoperatedinthehorizontalposition,with

mountingbracketsdown.

Operationinanyotherorientationwillcauseinsufficientcoolingoftheunit

leadingtoprematurefailure.

CAUTION

Theinputandoutputendsoftheseattenuatorsareclearlylabeled.Donot

coupleanattenuatorbackwardstothedirectionofpo

werflow.Destructionof

theoutputresistorwillresult.

CAUTION

AvoidputtingdirectpressureontheInputconnector.Theinputconnector

maybeinadvertentlydamagedcausinginaccurateoperationorpremature

failure.

CAUTION

Usecarewhenremovingorinstallingendcovertoavoiddamagingendcover

sealortheo‐ringsealontheRFout

putsection.

CAUTION

Donotoverfillthecoolanttankwithcoolant.Roommustbeallowedfor

expansionoftheheatedcoolant.

8320SeriesTenuline®Attenuator

Safety Statements

USAGE

ANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY

THE MANUFACTURER MAY IMPAIR THE INSTRUMENT’S SAFETY

PROTECTION.

USO

EL USO DE ESTE INSTRUMENTO DE MANERA NO ESPECIFICADA

POR EL FABRICANTE, PUEDE ANULAR LA PROTECCIÓN DE

SEGURIDAD DEL INSTRUMENTO.

BENUTZUNG

WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM

HERSTELLER BESCHRIEBEN, KANN DIE GERÄTESICHERHEIT

BEEINTRÄCHTIGT WERDEN.

UTILISATION

TOUTE UTILISATION DE CET INSTRUMENT QUI N’EST PAS

EXPLICITEMENT PRÉVUE PAR LE FABRICANT PEUT

ENDOMMAGER LE DISPOSITIF DE PROTECTION DE

L’INSTRUMENT.

IMPIEGO

QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO

DIVERSO DA COME SPECIFICATO DAL PRODUTTORE LA

PROZIONE DI SICUREZZA POTREBBE VENIRNE COMPROMESSA.

SafetyPrecautions

SERVICE

SERVICING INSTRUCTIONS ARE FOR USE BY SERVICE - TRAINED

PERSONNEL ONLY. TO AVOID DANGEROUS ELECTRIC SHOCK, DO

NOT PERFORM ANY SERVICING UNLESS QUALIFIED TO DO SO.

SERVICIO

LAS INSTRUCCIONES DE SERVICIO SON PARA USO EXCLUSIVO

DEL PERSONAL DE SERVICIO CAPACITADO. PARA EVITAR EL

PELIGRO DE DESCARGAS ELÉCTRICAS, NO REALICE NINGÚN

SERVICIO A MENOS QUE ESTÉ CAPACITADO PARA HACERIO.

WARTUNG

ANWEISUNGEN FÜR DIE WARTUNG DES GERÄTES GELTEN NUR

FÜR GESCHULTES FACHPERSONAL. ZUR VERMEIDUNG

GEFÄHRLICHE, ELEKTRISCHE SCHOCKS, SIND

WARTUNGSARBEITEN AUSSCHLIEßLICH VON QUALIFIZIERTEM

SERVICEPERSONAL DURCHZUFÜHREN.

ENTRENTIEN

L’EMPLOI DES INSTRUCTIONS D’ENTRETIEN DOIT ÊTRE RÉSERVÉ

AU PERSONNEL FORMÉ AUX OPÉRATIONS D’ENTRETIEN. POUR

PRÉVENIR UN CHOC ÉLECTRIQUE DANGEREUX, NE PAS

EFFECTUER D’ENTRETIEN SI L’ON N’A PAS ÉTÉ QUALIFIÉ POUR CE

FAIRE.

ASSISTENZA TECNICA

LE ISTRUZIONI RELATIVE ALL’ASSISTENZA SONO PREVISTE

ESCLUSIVAMENTE PER IL PERSONALE OPPORTUNAMENTE

ADDESTRATO. PER EVITARE PERICOLOSE SCOSSE ELETTRICHE

NON EFFETTUARRE ALCUNA RIPARAZIONE A MENO CHE

QUALIFICATI A FARLA.

8320SeriesTenuline®Attenuator

vii

About This Manual

Thismanualcoverstheoperatingandmaintenanceinstructionsforthe

followingmodels:

Changes to this Manual

Wehavemadeeveryefforttoensurethismanualisaccurate.Ifyoudiscoverany

errors,orifyouhavesuggestionsforimprovingthismanual,pleasesendyour

commentstoourSol on,Ohiofactory .Thismanualmaybeperiodicallyupdated.

Wheninquiringaboutupdatestothismanualrefertothepart

numberand

revisiononthe titlepage.

Chapter Layout

Introduction — Providesgeneralinformationaboutthe8320series

attenuators.

Theory of Operation — Describesindetailtheconstructionofthe8320

seriesattenuatorsandhowcoolingisachieved.

Installation — Providesinstructionsonhowtosetupthe8320series

attenuatorsforworryfreeoperation.

Operating Instructions — Detailsthestepsrequiredtosafelyoperatethe

8320seriesattenuators.

Maintenance — Providesroutinemaintenanceinspectionsandprocedures,

detailedtroubleshootingshouldmalfunctionsoccur,andstepbysteprepair

procedures.

Specifications — Givesdetailedspecificationsforeach8320seriesmodel,as

wellasacomprehensivelistofavailablereplacementpartsandoptionalRF

connectors.

8321 8322 8323 8325

viii

Table of Contents

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i

SafetySymbols.............................................. ..

.. ii

WarningStatements............................ .................iii

CautionStatements

... ...........................................iv

SafetyStatements...

................................. ........... v

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

ChangestothisManual.

............... .......................... vii

ChapterLayout.......

............... .......................... vii

Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

GeneralDescription.......

................................. ...... 1

OperatingEnvironment.........

.............................. 1

RFConnectors..................

............................. 2

Chapter 2 Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

AttenuatorConstruction...... ............

........................ 3

Cooling................. ........

............................... 3

CoolantExpansion .................

........................... 4

HeatDissipation.....................

......................... 4

Chapter 3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

UnpackingandInspection.....................

.................... 5

Location................ .............

............... ........... 5

Mounting.................. .....

............................... 6

Setup....... ...........

............... ................... ...... 6

VentPlugInstallation(Model8325).....

............... ......... 6

Installingina50OhmLine...... ..............

................. 7

Chapter 4 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

NormalOperation..............................

................. 8

EmergencyShutdown ...............................

............. 9

8320SeriesTenuline®Attenuator

Chapter 5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

RFAssemblyResistanceTest..................................... 10

DCResistanceMeasurement.

............... .................. 10

PreventiveMaintenance...............

............... ........... 12

PeriodicInspection.................. ....

............... ..... 12

CleanOutsideSurfaces...........................

............ 12

CleanConnectors....................................

........ 12

Troubleshooting................ .. .......................

....... 13

RepairProcedures ........... ..............................

..... 14

CoolantLeakageRepair....................................... 14

ReplaceRFConnector

 ................... ..................... 14

ReplaceCoolantTankOutputEndCoverSeal...

.................. 14

ReplaceCoolantTankInputO‐ringSeal.........................

 17

ReplaceRFAssembly ......................................... 18

CoolantLevelInspection..

............... ................... .. 18

Storage .............

............... ................... ........ 19

CustomerService......

............... .......................... 20

Shipping........

.............................................. 20

Chapter 6 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Specifications ..

................................ .. .............. 21

ReplacementParts

............... ................... ........... 22

AvailableQCTypeConnectors.

................................  23

Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Chapter 1 Introduction

General Description

TheSeries8320TenulineAttenuatorarelowreflectionresistancenetworksfor

useinreducingRFpowerin50ohmtransmissionlinesbyknownandcontrolled

amounts.See

"OutlineDrawing"onpage 2.

OverthefrequencyrangeofDCto500MHz,thepoweroutputwillbereduced

by30dB(99.9percent)±0.5dB.Upto500MHz,theinputVSWRwillnotexceed

1.1andtheoutputVSWR1.15.Theseattenuatorsareusefulforloweringahigh

inputRFpowerto

alevelsuitableforfeedingintoascope,frequencycounteror

similardevice.

Theyareself‐containedinstrumentsthatrequirenoexternalsourceofpoweror

utilityservice.

Allmodelsareportableandhaveaconvenientcarryinghandlenestedamong

thecoolingfinsonthetopside.Ifdesiredtheattenuatormaybepermanently

mounted,see

"Mounting"onpa g e 6.

Operating Environment

TheTenulineAttenuatorsshouldbeoperatedinadustandvibrationfree

environment.

Theyrelyonlyonambientaircurrents,theseattenuatorswillsafelyabsorb,and

dissipate,uptotheirmaximumratedinputpower.Theradiatorshavingcooling

finsspacedevenlyalongtheirlengthstoefficientlydissipateheatgenerated

duringoperation.

Allowatleast6inches(150mm)ofclearancearoundtheunittoallowsufficient

convectionaircurrentsforadequateheatdissipation.Theambienttemperature

rangeshouldremainbetween‐40°Cand+45°C(‐40°Fand113°F)forproper

operation.See

"Specifications"onpage21fortheratedpower,dimensionsand

weightofthe attenuators.

8320SeriesTenuline®Attenuator

RF Connectors

TheSeries8320AttenuatorsareequippedwithaBirdQuick‐Change(QC)

connectors.

FemaleNtypeco

nnectorsarenormallysuppliedfortheinputandoutputbut

maybeconvenientlyandeasilyinterchangedwithotherBirdQCconnectors.See

"Ava ilableQCTypeConnectors"onpage23foralistofavailableconnectors.See

"ReplaceRFConnector"onpage14forreplacementinstructions.

Figure 1 Outline Drawing



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

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#$

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./.#0%!#

#%

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

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

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$&$

+"2

#$03"

Note: Model8325isshowninFigure1.

Chapter 2 Theory of Operation

TheSeries8320maybeusedforthe isolationofpowersourcesuptotheir

maximumpowerratingandforlowlevelmonitoring.Thelowpowervalue

obtainedattheoutputoftheattenuatorcaneasilybefedintoanoscilloscopeor

terminatedinasmallRFloadresistor.

Attenuator Construction

TheSeries8320Attenuatorsaresymmetrical“T”pads,withthepower

distributiononthelegsbeingdifferent.Thevalueoftheresistanceoneachleg

varies;therefore,accordingtothepoweritistoabsorb.Ontheinputresistance

element,aproportionatelylargerresistorisofcourserequiredforitsmuch



greaterpowerdissipation.A“T”configurationisusedtoprovideequalinputand

outputimpedancesforthe 50ohmtransmissionlineattenuation.

Theinputresistorisjoinedtothe“T”legjointinanexponentiallytapered

housingtoprovidealinearreductioninsurgeimpedancedirectlyproportional

tothedistancealongtheresistor.Theoutputresistorisenclosedinahousing

designedtoreturntheattenuatortothecharacteristicimpedanceof50ohms.



Thisarrangementproducesauniformandpracticallyreflection‐lessattenuation

characteristicoverthestatedfrequenciesoftheattenuator.

Thissystemoffilm‐on‐ceramiccylindricalresistorsimmersedinadielectric

coolantconstitutestheRFAssembly.Thedielectricconstantofthecoolingfluid

andthetaperedinputandoutputresistorhousingsprovidetheproperelectrical

characteristicsforthecoaxiallineattenuationthroughouttheinternalcircuitry.

Cooling

Thedielectriccoolantiscarefullychosenforitsdesirabledielectricproperties,to

whichthediametersoftheresistorsandhousingsarematched,andforitshigh

thermalstabilitycharacte ristics.

Thecoolantusedis10CTransformerOil,P/N5‐030.

 Model8321requiresapproximately1pint(0.47liter)

 Model8322,0.7gallons(2.65liter)

 Model8323,0.35gallons(1.3liter)

 Model8325,0.9gallons(3.4liter).

8320SeriesTenuline®Attenuator

Coolant Expansion

Models8321,8322and8323allowforexpansionofthecoolantbyusingunder‐

filledradiatortanksandaderatingoftheirloadcarryingcapacities.

Model8325includesanexpansiontankandaventpluglocatedontheoutput

endatthetop.Whenpowerisappliedtotheattenuator,thecoolantexpands

intotheexpansiontank,astheairintheexpansiontankiscompresseditis

allowedtoescapethroughtheventplug.

Heat Dissipation

HeatDissipationisaccomplishedbyconvection,thecoolingfluidcarriestheheat

generatedintheresistorelementstothewallsofthecoolanthousing.This

housingisencasedinasetofradiatingfinswhichareattachedtoitsouter

surface.Theseradiatingsurfacesdissipatetheheatofthecoolantinto

the

surroundingair.

Chapter 3 Installation

Unpacking and Inspection

1. Carefullyinspectshippingcontainerforsignsofdamage.

 Iftheshippingcontainerisdamaged,donotunpacktheunit.

ImmediatelynotifytheshippingcarrierandBirdTechnologies .

 Iftheshippingcontainerisnotdamaged,unpacktheunit.Save

shippingmaterialsforrepackaging.

2. Inspectunitforvisualsignsofdamage.

Note: Ifthereisdamage,immediatelynotifytheshippingcarrier

andBirdTechnologies.

Location

TheSeries8320TENULINE®Attenuatorsshouldbelocatedtoallowoperationin

thehorizontalpositiononly,withthehandleupandmountingbracketsdown.

Allowatleastsixinches(150mm)ofclearancearoundtheunitinanareawith

freelycirculatingambientair.Unimpededairflowofconvectionaircurrentsis

requiredforadequateheatdissipation.

Positiontheattenuatortopermit theshortestpossi blecablelengthsbetween

theunitandthetransmittingequipment.

Theattenuatorisnotintendedorrecommendedforoutdoorusewhereitwillbe

unprotectedandexposedtotheelements.

CAUTION

TheAttenuatorisdesignedtobeoperatedinthehorizontalposition,with

mountingbracketsdown.

Operationinanyotherorientationwillcauseinsufficientcoolingoftheunit

leadingtoprematurefailure.

8320SeriesTenuline®Attenuator

Mounting

Theattenuatorisdesignedforeitherportab le operationorfixedinstallation,

thatis,itmayoperatedwithorwithoutbeingsecuredtoabenchorother

horizontalsurface.

Model8321isequippedwithrubberbumperfeetwhich canberemovedfor

permanentmounting.Theholesaretappedfor8‐32screws.

ForModels8322,8323and8325,thefrontandrearfinsaremadeofheavier

gaugematerialbentoutward90toformmountingflanges.Ateachcornerof

theseflangesisa9/32inch(7mm)diametermountinghole.Theholesare

arrangedinarectangle,see

"Specifications"onpage21forthedimensions.The

attenuatormaybesecuredtoahorizontalsurfaceusingcustomerprovided

screws,nutsandlockwashers.

Setup

Vent Plug Installation (Model 8325)

BeforeplacingtheModel8325Attenuatorintoservice,thesolidshippingplug,

P/N2450‐049mustberemovedandreplacedbythespringloadedventplug,



P/N2450‐094.Thetwoplugsarelinkedtogetherbyapieceofbeadchain.

1. Locatetheventholefortheplug,locatedonthetopneartherear.

SeeFigure1onpage 2.

2. Removetheshippingplug.

3. Verifythe O‐Ringisinstalledontheventplug.

4. Installtheventplug

5. Retaintheshippingplugforuseintransportingtheattenuator.

Theshippingplugshouldbeplacedbackintheventholewheneverthe

attenuatoristobeshipped.TakecarenottolosetheO‐Ringseal.

WARNING

Theventplugmustbeinstalledatalltimeswhentheunitisinoperationor

cooling.Alwayschecktoensureventplugisinstalledpriortooperation.

Failuretodothiscouldresultindamagetotheequipmentandendangerthe

operator’ssaf ety.

Installation

Installing in a 50 Ohm Line

Models8322,8323and8325arelabeledINPUTandOUTPUTontherespective

ends.

Model83

21islabeledontheoutputendonly.

Thepr

operendsoftheseattenuatorsmayalso beidentifiedbytheinput

connectorbeingmountedontheflatgoldcoloreddiscwhereastheoutput

connectorismountedontheroundedsilvercoloreddome.

CAUTION

1. Performth

eRFAssemblyTestontheAttenuator,see"RFAssembly

ResistanceTest"onpage 10.

2. Connectthetr

ansmittingequipmentundertesttotheinputofthe

attenuator.

Use50ohmco

axialcabling(RG‐8A/U,RG‐9/U,RG‐213/Uorequivalent)

equippedwithplugswhichmatewiththeconnectorsontheattenuator.

3. Connecttheoutputtoas

uitableload.

4. Proceed acc

ordingto"OperatingInstructions" onpa ge 8.

Note: Whenre

connectingtheantenna,itmaybecomenecessary

toslightlyreadjustthetransmitterduetopossibledifferencesin

VSWRbetweentheattenuatorandtheantennasystem.

WARNING

LeakingRFenergyisapotentialhealthhazard.

Neverattempttoconnectordisconnectequipmentfromthetransmission

linewhileRFpowerisbeingapplied.

Severebu

rns,electricalshock,ordeathcanoccur.

Theinp

utandoutputendsoftheseattenuatorsareclearlylabeled.Donot

coupleanattenuatorbackwardstothedirectionofpowerflow.Destructionof

theoutputresistorwillresult.

Chapter 4 Operating Instructions

TheSeries8320TENULINE®Attenuatorsshouldfunctionfaultlessly,absorbing

andconverting RFenergyintoheatindefinitely,iftheyareproperlymaintained

andnotsubjectedtoanoverload.

Normal Operation

Note: TheSeries8320TENULINE®Attenuatorsarenotintendedor

recommendedforoutdoorusewheretheywillbeunprotectedand

exposedtotheelements.

1. Installtheattenuatorinthetransmissionline,see"Installingin a50Ohm

Line"onpage 7.

2. (Model8325)VerifytheVentPlughasbeeninstalled,see"VentPlug

Installation(Model8325)"onpage6.

3. Proceed accordingtothetransmittermanufacturer’sinstructions.

Theattenuatormaybesubjectedtoverymoderateoverloadsforlimited

periodsoftimewithoutoverheating.However,thisshouldbedonevery

cautiouslytoguardtheattenuatoragainstthedangersofoverheating.

CAUTION

Theinputandoutputendsoftheseattenuatorsareclearlylabeled.Donot

coupleanattenuatorbackwardstothe

directionofpowerflow.Destructionof

theoutputresistorwillresult.

WARNING

Theventplugmustbeinstalledatalltimeswhentheunitisinoperationor

cooling.Alwayschecktoensureventplugisinstalledpriortooperation.

Failuretodothiscouldresultindamagetotheequipmentand

endangerthe

operator’ssaf ety.

WARNING

Usingtheattenuatorintheupperendofitspowerdissipationrangewillcause

thehousingtobecomehot!

Careshouldbeexercisedintouchingthem.

OperatingInstructions

Emergency Shutdown

Shouldtherebeanyabnormaloperationorfailureoftheattenuator,shutdown

thetransmitterimmediatelyandallowtheunittocoolbeforeperformingany

maintenance.

1. DisableRFpoweratthetransmitter.

WARNING

LeakingRFenergyisapotentialhealthhazard.

Neverattempttoconnectordisconnectequipmentfromthetransmission

linewhileRFpowerisbeingapplied.

Severeburns,electricalshock,ordeathcanoccur.

Chapter 5 Maintenance

RF Assembly Resistance Test

Note: Thesetestsarebynomeansanecessitytotheoperationof

theattenuatorbutmerelyguidelinesfortheusersinformation.

AccuratemeasurementoftheDCresistancebetweentheinputtoground,

outputtoground,andinputtooutputwillprovideagoodcheckofthecondition

oftheattenuator.

CheckingtheDCresistanceissimplyusedtomeasureachangeintheresistance

overtime.TrackingtheDCresistanceshouldstartbefore theunitisfirstputinto

service.Performthefollowingstepsandrecordthevalueforfuturecomparison.

Resistancemeasurementsshouldbetakenperiodicallyaccordingtouse.

Preparation:

 Tools:Commonhandtools.

 Ohmmeterwithanaccuracyof±1%at50ohms(orusearesistance

bridge).

 Uselowresistanceleads,preferablyashortpieceof50ohmcoaxial

cablefittedwithanappropriateconnectororalligatorclips.

 Temperatureoftheattenuatorshouldbestabilizedbetween20°Cto

25°C(68°Fto77°F).

DC Resistance Measurement

Note: Itisrecommendedthatthisresistancecheckbeperformed

eachtimetheattenuatoristobeused.

1. TurnoffRFpowerbeforemakinganydisconnections.

2. DisconnecttheRFcoaxialline.

3. Take thefollowingmeasurements:

WARNING

NeverattempttoconnectordisconnectRFequipmentfromthetransmission

linewhileRFpowerisbeingapplied.

LeakingRFenergyisapotentialhealthhazard.

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BIRD 8325 Owner's manual

BIRD 8325 Owner's manual

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