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Section-5 Maintenance

October 17, 2013

5‐8

WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004

Note

RTAC precorrection is automatically disabled and power control is automatically switched to manual

mode during calibration.

5.4.2 ForwardCalibrationProcedure

STEP 1 ZeroandcalibrateRMSpowermeterfollowingthemanufacturer’s

proceduresforspecificmodel.

STEP 2 Locatesystemforwardcalibrationsampleport,whichshouldhavebeen

measuredandlabeledatthefactorywiththecouplingfactorforyour

frequencyofoperation.Thiswilleitherbeaforwardportonthepre‐filter

directionalcoupler,leftavailableforthispurposeinastand‐alone(i.e.non‐

racked)configuration,orth

efrontpanelPRE‐FILTERFWD (forward)power

sampleinarackedconfiguration.Ifthecouplingfactorisinquestion,orif

thefrequencyhaschanged,theapplicableforwardcouple rportshouldbe

sweptwithanetworkanalyzertodeterminethecorrectcouplingfactorat

thefrequencyofinterest.Remembertoincludeth

elossintheroutingcables

inthenetworkanalyzermeasurementwhencharacterizingthebulkhead

measurementpoint.

STEP 3 Oncethecouplingvalueisdetermined,enterthisvalueasanoffsetinthe

powermeter,setthemeter’sdisplaytoreadindBm(3digitsissufficient,i.e.

xx.xdBm),andconnectthemeter’ssensortothisport.

Note

Please ensure that the sample level present at this point (max system output, in dBm, minus the coupling

factor) does not exceed the maximum input range of power sensor being used.

STEP 4 IfdualLPUsareinusesettheTCUDriverControltoManual.SelecttheLPU

tobecalibratedastheactiveLPU.

STEP 5 PressandholdtheLowerbuttonfor30secondstoreducetransmitterRF

outputatturn‐on.UsetheTCULowerbuttonfordualsystems.UsetheLPU

LowerbuttonifasingleLPUispresent.

STEP 6 PressTCUOnbuttonifpresent.PressselectedLPUOnbuttonifnoTCUis

presetn.

STEP 7 EntertheForwardcalibrationmenu,eitherfromthefrontpanel(Setup>

XMTRPOWERSETTINGS>POWERCAL>FORWARD)orfromtheWebGUI.

See’SystemCalibration’(leftside)inFigure5‐3onpage5‐6.

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Sharp SD-AT1000W Specifiche Pagina 188