Tektronix 494AP service manual O o a, PerformanceCheckprocedure- 4g4Al4g4ApServlceVol.1

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PerformanceCheckprocedure- 4g4Al4g4ApServlceVol.1

	SPECTRUII
POWER	ANALYZER
	UI{DERTEST
METER	SIGI{ALSOURCE

RF ExT

OUT ALc

ADAPTER ADAPTER ADAPTER

FOWERDIVTDER

ATTET'IUATOf,

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POTYERSENSOR

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LOWLOSSCOAXCABLEIYITHSMA COI{NECTORS

Flgure4-14.RF attenuatortest equipmentselup.

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c. Disconnectthe power sensor from the power divider,and connectit to th€ the I ,WISO MHz refer- ence output port through an appropriateadapter. Be surethatthe 50 MHz referenceis'tumedoff.

-d. On the powermeter,pressSensorZeroand wait for the-zero light to turn off. Repeatuntil a zero is attained.

e. .On the power meter, set the 50 MHz reference on and set the Cal Factor switch to the 50 MHz refer- ence.. Set the power meter Cal Adj for a 1.000mW reading.

f.Turn off the 50 MHz referenceon the power meter, and reconnectth€ power sensorto th€ power divider.

g.Resetthe powermetercontrolsas follows:

Cal Factor Test frequency

Mode dBm

RangeHotd Out

setthe signatgen€rator(Hpg3508/s3595A)

.h.con- trols as follows:

FrequencyMode CW

Frequency Test Frequency

OutputLevel --5 dBm

i.Set the generatorcontrolsfor a -15dBm power meterreading(approximately-5 dBm generatoroutput Ievel).

j.Tunethe CENTERFREQUENCYcontrotto brino the signalto centerscreen.

k.The SpectrumAnalyzershould be displayinga signalof approximately-35dBm.

l.Usethe SpectrumAnalyze/sAMPL CALcontrol to positionthe signalpeakat a convenientgraticuleline, thenactivateSAVEA.

m.Establisha referencesettingfor the first 10 dB incrernentby pressingdB[Ref on the powermeter.

n.Resetthe MIN RF ATTENdB controlto 10 and the REFERENCELEVELto -20dBm. Reset the gen- eratoroutputlevelfor a powermeterreadingof +10 dB (10 dB increasein outputlevel).

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