Sharp SD-AT1000W Especificaciones descargar pdf (Pagina 202)

Section-5 Maintenance

October 17, 2013

5‐22

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

5.6.1.1 AverageandPeakConversionFormulaeandExamples

AveragePower=PeakVisualPower*Factor

PeakVi

sualPower=AveragePower/Factor

Example1:Ca

lculatetheaveragepowerofaSystemMtransmitteroperatingat1000Wpeakvisualwithanaural

injectionlevelof‐10dB.

Factorfo

rSystemMwith‐10dBauralinjection=0.695

AveragePo

wer=1000W*0.695=695W

Example2:CalculatethepeakvisualpowerofaSystemKtransmitterwith‐13

dBauralinjectioniftheaveragepower

is1600W.

Factorfo

rSystemKwith‐13dBauralinjection=0.645

PeakVi

sualPower=1600W/0.645=2480W

Example3:Ca

lculatetheaveragepowerofaSystemBtransmitteroperatingat60kWpeakvisualwithnoaural.

FactorofSyste

mB,visualonly=0.567

AveragePo

wer=60kW*0.567=34.02kW

Usethef

ollowingformulatocalculatefactorsforotherauralinjectionlevels:

Factor=v+10

(a/10)

Where:v=visualonlyfactorforsystem

a=auralinjectionlevel

*Incas

eswithmultipleauralcarriers,(Nicam,DualCarrier)addthefactorsforeachauralcarriertothevisualfactor.

Example4:Aur

alcarriersat‐13dBand‐20dBforsystemB

Factor=v+10

(a/10)+10(a/10)

Factor= v+10

(‐13/10)+10(‐20/10)

Factor= 0.56

7+0.0501+0.01

Factor=0.62

5.6.2 AnalogForwardCalibration

Forwardpoweriscalibrate dat10dBbelowmodelpowerandatmodelpowertoensuregoodmeteringlinearity

overthefull10%‐100%range.Theforwardpowerreferencesample istypicallytakenfromadirectionalcoupler

beforethemaskfilterinthesystemandregulatesthepowerofthetransmitteroutputbef

oreanyfilterlosses.

Thesy

stemforwardpowersampleistakenfromaforwardportonthepre‐filterdirectionalcoupler(showninFigure

5‐11).Thecou

pledportwillhaveanattenuatorpadandassociatedcabling(andalsoatwo‐waysplitterifusedina

dualLP

Uconfiguration).TheintendedoperatingconfigurationhastheFWDsamplepadselectedsothatatfull

systemoutputthesample(s)attheLPUFWDinput(seeFigure5‐12)wil

lbeapproximately0dBmafterfactoringin

couplerva

lue,cablingloss,splitterloss(ifinstalled),andpadvalue.

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