BIRD TPM1 User manual

Transmitter Power Monitor/Meter
Model TPM series
&
3140A Power Meter Panel
Operation Manual
©Copyright 2016 by Bird Technologies, Inc
Instruction Book Part Number 920-TPM Rev. C
Microsoft and Windows are registered trademarks
of the Microsoft Corporation

i
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on.

SafetyPrecautions
ii
Safety Symbols
Note: Callsattentiontosupplementalinformation.
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page17
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.
WARNING
DisconnecttheunitfromtheRFpowersourceandtheaclinebeforeany
disassembly.Thepotentialforelectricalshockexists.

TransmitterPowerMonitor/Meter
iii
Caution Statements
Thefollowingequipmentcautionsappearinthetextandarerepeatedherefor
emphasis.
Seepage3
Seepage6
Seepage7
Seepage17
CAUTION
Pin4mustbeconnectedtopowersupplyground,othergroundscanbeleft
openifdesired.
CAUTION
DB9arenotserialconnections.Serialconnectionstothemcoulddamagethe
equipment.
CAUTION
ABirdCalibrationKitisrecommendedforthisprocedure.Performinga
calibrationwithanythingotherthanaBirdCalibrationKitvoidsBird’s
accuracyguarantee.
Performingafieldcalibrationwillvoidanyremainingwarrantyonthis
product.Birdrecommendswaitinguntilthetermsofthewarrantyhave
passedbeforeperformingafieldcalibration.
CAUTION
Donotuseharshorabrasivedetergentsforcleaning.

SafetyPrecautions
iv
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.

TransmitterPowerMonitor/Meter
v
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.

SafetyPrecautions
vi
RF VOLTAGE MAY BE PRESENT IN RF ELEMENT SOCKET - KEEP
ELEMENT IN SOCKET DURING OPERATION.
DE LA TENSION H.F. PEAT ÊTRE PRÉSENTE DANS LA PRISE DE
L'ÉLÉMENT H.F. - CONSERVER L'ÉLÉMENT DANS LA PRISE LORS
DE L'EMPLOI.
HF-SPANNUNG KANN IN DER HF-ELEMENT-BUCHSE ANSTEHEN -
ELEMENT WÄHREND DES BETRIEBS EINGESTÖPSELT LASSEN.
PUEDE HABER VOLTAJE RF EN EL ENCHUFE DEL ELEMENTO RF -
MANTENGA EL ELEMENTO EN EL ENCHUFE DURANTE LA
OPERACION.
IL PORTAELEMENTO RF PUÒ PRESENTARE VOLTAGGIO RF -
TENERE L'ELEMENTO NELLA PRESA DURANTE IL
FUNZIONAMENTO.

TransmitterPowerMonitor/Meter
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Solon,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.
Terminology
There are some unique terms used throughout this literature. They
are defined here clarify any misunderstanding.
TPM — Refertothein‐lineTransmitterPowerMonitor.
Display or Panel Meter — Referstoeitherthe3140A4or3140A8meter.
Chapter Layout
Introduction — DescribesthepurposeandfunctionoftheTPMaswellasa
generaloverviewoftheproduct.
Installing & Operating Instructions - TPM — Describesthefeaturesof
theTransmitterPowerMonitorandprovidespower‐upinstructions.
Installing & Operating Instructions - 3140A Panel — Describesthe
featuresofthePowerMeterPanelandprovidespower‐upinstructions.
Calibration — Describesdifferentcalibrationmethodsandwhentousethem.
Performance Specifications — Specificationsandpartsinformationare
alsolisted.
AllTPMseries 3140A4 3140A8

1
Table of Contents
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
SafetySymbols..................................................ii
WarningStatements.............................................ii
CautionStatements..............................................iii
SafetyStatements...............................................iv
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
ChangestothisManual..........................................vii
Terminology...................................................vii
ChapterLayout................................................vii
Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PurposeandFunction............................................1
Chapter 2 Installing & Operating
Instructions - TPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
InstallingtheTPM...............................................3
NormalOperation............................................4
Chapter 3 Installing & Operating
Instructions - 3140A Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
InstallingthePanel..............................................6
Chapter 4 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ZeroCalibrating.................................................7
PassiveCalibration...............................................8
ActiveCalibration...............................................9
Chapter 5 Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . 11
TransmitterPowerMeter(TPM)..................................11
ModelNamingTable.........................................11
Dimensions.................................................14
3140AMeterPanel.............................................16
Chapter 6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
InspectionandCleaning.........................................17
ROHS.........................................................17
Troubleshooting................................................19
PartsList......................................................20
CustomerService...............................................21
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

1
Chapter 1 Introduction
Calibratedcouplingportsandaccuratepowermeasurementcombinedinthe
sameunitprovidesforeasyuseandaccuratereadings.TheTPMisthefirstinline
powermonitorthatcanbecalibratedin‐lineandonsiteminimizingdowntime
andoptimizingon‐airtime.Inaddition,asimplifiedinterfaceallowsforahigh
levelofcustomizationandintegration.
Purpose and Function
TheTPMisusedtomeasurepowersignalsinbroadcastsystems.Itisused
directlyinlinewiththesystembeingtested.It’soutputprovidesalinearDC
voltageoutputfrom0to4voltsallowingforawidevarietyofinterfaceoptions.
It’sin‐linecalibrationcapabilityallowsforgreateraccuracyinasingle
application(withanaccuratepowerreference)anditsintegratednon‐
directionalcouplerallowsforsignalanalysisinminimalspacerequirements.Itis
availablein7/8 ”, 15/8 ”, and31/8”,50ohmlinesforFM,VHF,andUHFbroadcast
frequencies.
WhencombinedwithaBirdmodel3140A4or3140A8TransmitPowerMeter
(TPM)display,acompleteadjustmentsystemisachieved.Thedisplaysuppliesa
visualindicationofForwardandReflectedpowerbeingsampledbytheinline
TPM.MultipleTPM’scanbeselected(onlyoneperchannelsetting)togivethe
operatoranoverallconditionofthetransmittersystem.
3140 Panel
TPM7
TPM1

2
Chapter 2 Installing & Operating
Instructions - TPM
Figure 2 TPM
Note: Thelabelonthetopoftheunitidentifiestheconnectors
andports.Theyaredefinedasfollows:
Note: TPMunitsareterminatedatthetimeofassembly.
SOURCE ConnecttothesourceoftheRFsignal(transmitterside)
LOAD ConnecttotheloadoftheRFsignal(antenna/dummyload)
FORWARD Theforwarddirectionalcouplerport.Term inatethisportin
50ohmsatalltimes.1
1 If these ports are not terminated in 50 ohms, power
measurements will not be accurate.
REFLECTED Thereflecteddirectionalcouplerport.Ter minatethisportin
50ohmsatalltimes.1
TEST Anondirectionalsampleport.Noterminationisrequired.
To Source
Operation LED
Calibration Cover
FWD Port
RFL
Port
Test
Port
Calibration Cover
Note: Figureshownwithterminationsassembled.
To Load
Communication
Connector
TPM1 Shown

TransmitterPowerMonitor/Meter
3
Installing the TPM
TheTPMhastwoRFconnectors(SourceandLoad)thatconnecttothe
transmissionline,threetestportconnectorsthataretypeNfemaleconnectors
(Forward,Reflected,andTest ),andonenine‐pinsub‐miniaturecommunication
connector(DB‐9Male).
1. Dothefollowing:
ConnecttheRFconnectorlabeledSourcetothetransmittersideofthe
transmissionline.
ConnecttheRFconnectorlabeledLoadtotheantennaorloadsideof
thetransmissionline.
UseanappropriatecouplingkittosecuretheTPMinplace.
2. ConnecttheDB‐9connectortoasinglechannelonModel3140Apower
meterpanel,ortoanalternateappropriatepowersupplyandvoltmeters
thatwillindicatetheforwardandreflectedpower.
Note: ThechartbelowFigure2identifiesthesignalsoneachpin
oftheDB‐9connector.
Figure 4 DB-9 Connector
Note: Above4VDC,theaccuracyspecdoesnotapply.
CAUTION
Pin4mustbeconnectedtopowersupplyground,other
groundscanbeleftopenifdesired.
Pin Description
1Forward Voltage Output, 0 to 5 VDC, 1.0 kohm impedance
2Ground
3Reflected Voltage Output, 0 to 5 VDC, 1.0 kohm impedance
4Power Supply Ground
5DC Power Input, +11 to +18 VDC, <0.1 A current draw
6Ground
7Ground
8Ground
9Zero Calibration. DO NOT ground this pin. Leave this pin floating.
1
69
5
Pin 4 -
Power Supply
Ground

Installing&OperatingInstructions‐TPM
4
Normal Operation
Note: Couplerportsmustbeterminatedtoensureaccuratepower
measurements.Terminatebothforwardandreflectedcoupler
portsin50ohms.Failuretoterminatetheseportswillresultin
inaccuratepowermeasurements.
1. InstalltheTPMtothetransmissionline.See
"InstallingtheTPM"onpage
3 .
2. ApplyDCinputpowertotheTPM.
3. ApplyRFpowertotheTPM.
4. Useavoltmetertomeasuretheforwardvoltageandreflectedvoltage.
Note: Thesevoltageswillbebetween0V(nopower)and4.0V
(fullscalepower).Theforwardandreflectedvoltagesarelinear.
Note: Thefullscalereflectedpoweris1/10thevalueofthefull
scaleforwardpower.

5
Chapter 3 Installing & Operating
Instructions - 3140A Panel
The3140AisthestandarddisplayandpowersupplyfortheTPM.Itcomesin
both4ChannelTPMand8ChannelTPMmodels.Itfitsinastandard2Urackand
requiresasingle15Vpowersupply(suppliedwithpanel).
Figure 5 3140 Panel
FWD
Meter
Power
Button
DB9 Connections
Switch Notation Area
Meter
Adjustment
Pot
Channel
Selector
RFL Meter
Front View
DB9 Connections
Rear View
Meter
Adjustment
Pot
Meter
Adjustment
Pot
Zero Calibrate
Switch
Meter
Adjustment
Pot
Zero
Calibrate
Switch
Note: 3140A8shown.
Note: Removetheshuntingwiresfromthemeters.

Installing&OperatingInstructions‐3140APanel
6
Installing the Panel
1. Placepanelinanemptyslotontherackandattachwithmountingscrews
(optional).
2. Connectthepaneltoapowersupply.
3. AttachaTPMtooneoftheavailablechannelsonthebackofthepanel.
4. LabelwhatTPMisattachedtowhichchannelintheswitchnotationareaon
thefrontofthepanel.
Note: Usershouldnoteeachunit’sfullscalepowerandlocationin
thenotationarea.Useawatersolublemarkertoavoidpermanent
entries.
5. Repeatsteps3through5forotherTPM’s,ifnecessary.
6. Turnthepanelon.
Note: AllTPMsarepowered,butonlyoneTPMoutputisdis‐
playedatatime.
7. SelectthedesiredTPMtobemeasuredbyusingthechannelselector.
Note: ThepotsadjustthemeterindependentlyofTPM
calibration.Theappropriatemeterscale(1/2.5/5)mustbeused
witheachTPM.
CAUTION
DB9arenotserialconnections.Serialconnectionstothem
coulddamagetheequipment.
FWD/RFLMeter ProvidesvisualindicationofmeasuredpowerforselectedTPM.
MeterAdjPot Providesfullscalemetercalibration.
ChannelSelector Selectseitheroneoffour(3140A4)oroneofeight(3140A8)
connectedTPM’s.
PowerButton AppliesDCinputpowertopanelmeter.
ZeroCalibrate
Switch Groundspin9toZerocalibratetheselectedTPM.
DB9Connection InterfaceconnectiontoTPM’s.ProvidespowerandZeroadjustto
connectedTPM’s.ReceivesTPMoutputtodrivemeters.

7
Chapter 4 Calibration
Everycalibrationprocedurewillfinishbyprovidingatableofvoltagesthat
correspondtopowerlevelsatthecalibrationfrequency(f0).Itwillbeuptothe
usertousethosevoltagestogenerateanequationorfillinalookuptableon
whatevertheychoosetouseasanoutput.
Zero Calibrating
Note: ThisprocedurecanbeperformedanytimetheRFisoffand
theTPMison.ThereisnoneedtocyclepoweragainontheTPM.
1. Dooneofthefollowing:
Locatepin9ontheTPM’sDB9connectorandshortittoground.
Ifconnectedtoadisplaypanel,pressthezerocalibrationswitch.Refer
toFigure4forZeroCalibrationSwitchlocation.
Note: ZerocalibratewillsetboththeFWDandRFLatthesame
time.
Figure 7 Pin 9
CAUTION
ABirdCalibrationKitisrecommendedforthisprocedure.Performinga
calibrationwithanythingotherthanaBirdCalibrationKitvoidsBird’s
accuracyguarantee.
Performingafieldcalibrationwillvoidanyremainingwarrantyonthis
product.Birdrecommendswaitinguntilthetermsofthewarrantyhave
passedbeforeperformingafieldcalibration.
1
69
5
Pin 9

Calibration
8
Passive Calibration
CalibratetheTPMonthetransmitteritismonitoring.Alsoareferencepower
meterisneededtomeasuretheoutputofthetestportontheTPM(model
7006A250).Thiscalibrationcanbeperformedwhiletransmittingonair(forward
only)orintoadummyload.CouplingcalibrationdatafortheTPMisalso
needed.
Byusingseveraldifferentpowerlevels,anequationorlookuptablecanbe
generatedforthevoltageoutputoftheTPMasafunctionofpowerlevelatthe
frequencyofcalibration.
1. InstalltheTPMtothetransmissionline.See
"InstallingtheTPM"onpage
3 .
2. RemovetheloadfromtheFwdtestport.
3. ConnectthecalibrationstandardtotheFwdtestport.
4. ApplyRFpower.
5. Recordthetransmitterfrequencydisplayedandfindthelistingclosesttoit
ontheTPM’scouplingcalibrationdatacard.
Note: Makenoteofthecalibrationfactor.
6. Enterthecalibrationfactorintothecalibrationstandard’soffsetfunction.
7. MeasurethepoweronthecalibrationstandardandvoltageontheTPM
outputsimultaneously.
8. Recordthevoltageversespower.
9. Turntheunitaroundandrepeatsteps1to7forReflectedcalibration.
Note: Reflectedfullscaleis1/10thofforwardfullscale.
Note: Calibratingthereflectedportisoftenoptional.Checkwith
theFCCorotherrulingbodytodetermineifitisnecessaryornot.
Figure 8 Calibration
ForwardCalibrationSet‐Up
TPM
Connector
ReflectedCalibrationSet‐Up
Calibration Standard
CalibrationKit

TransmitterPowerMonitor/Meter
9
Active Calibration
TheactivemethodwillrecalibratetheTPMcompletely.Thisprocedurewillvoid
thecalibrationandaccuracyspecificationsfortheunit.Theaccuracywillbe
basedontheaccuracyofthereferencepowermeterusedforthisprocedure.In
additiontotheequipmentneededfortheactivecalibration,aBird6A340‐ADJ
PotentiometerAdjustmentTooltoadjustthepotentiometersontheTPMisalso
needed.
Setthetransmitter’sRFoutputtoadesiredpowerlevelusingthereference
meteronthetestportandthetestportcalibrationdata.Then,usingaBird
6A340‐ADJPotentiometerAdjustmentTool,turnthepotentiometersuntilthe
desiredvoltageoutputisreached.Extradatapointscanbetakenatdifferent
powerlevelstoconfirmthelinearityandgeneratealookuptabletodrivethe
restofthepowerlevels.
Thebenefitofthiscalibrationmethodisthatthecustomercansettheoutput
voltagetheywanttodrivetheirexternalmeter.Withtheothercalibration
methods,thecustomersimplyusesTPMoutputvoltagesassetatthefactory.
1. InstalltheTPMtothetransmissionline.See
"InstallingtheTPM"onpage
3 .
2. RemovetheloadfromtheFwdtestport.
3. ConnectthecalibrationstandardtotheFwdtestport.
4. ApplyRFpower.
5. Recordthetransmitterfrequencydisplayedandfindthelistingclosesttoit
ontheTPM’scalibrationdatacard.
Note: Makenoteofthecalibrationfactor.
6. Enterthecalibrationfactorintothecalibrationstandard’soffsetfunction.
7. BreakthesealovertheFwdCalhole.
8. Adjustthepotentiometermanuallyuntilthevoltageissuchthatthe
calibrationstandardreadsfullscalepower=4.00V.
Example:Ifthepowerisexactly50%offullscale,adjustthepotentiometertoget
V=2.00V.
9. Repeatsteps1to9forReflectedcalibration.
Note: Calibratingthereflectedportisoftenoptional.Checkwith
theFCCorotherrulingbodytodetermineifitisnecessaryornot.

Calibration
10
Figure 9 Calibration Data Card
Transmitter
Frequency
Fwd Coupling
Offset at 195 MHz
Rfl Coupling
Offset at 195 MHz

11
Chapter 5 Performance Specifications
Transmitter Power Meter (TPM)
Model Naming Table
Note: ModelsTPM3x‐LVandmodelsTPMx‐USarenotoffered
forsale.
FrequencyRange‐Modeldependent.Seetableabove
ForwardFullscalePower‐Modeldependent.Seetablebelow.
Note: Maximumsafelinepowermaybelowerthanfullscale
power.SeeLineSectionMaxRFPowervsFrequencytableonpage
20forrecommendedmaxsafelinepowersattheactivefrequency.
Line Size and Interface
Style Frequency Band* Power Range UHF Sub-Band
7xy=7/8 ” withQCconnectors,
wherexistheinputconnector
andyistheoutputconnector.
Possiblevaluesofxandyare:
L=54‐88MHz
F=88‐108MHz
H=174‐216MHz
U=470‐806MHz
V=VeryLow
L=Low
M=Medium
H=High
S=VeryHigh
A=470‐554MHz
B=554‐638MHz
C=638‐722MHz
D=722‐866MHz
A=N(F) B=N(M)
C=LC(F) D=7/8 ” Flange
H=7‐16
DIN(F) J=7‐16DIN(M)
K=UHF(F) L=UHF(M)
1=1‐5/8 ” 
Flanged
1U=5/8 ” 
Unflanged
“recessed”
1UF=1‐5/8 ” Unflanged“flush”
3=3‐1/8”
Flanged
3U=3‐1/8”
Unflanged
“recessed”
3UF=3‐1/8”Unflanged“flush”