Tektronix 494AP service manual Verttcal, Tmeidiv Auto PEAK/AVERAGE

PerformanceCheckProcedure- 4g4A/4g4ApServlceVol. 1

-c. Set tle_:rlveeposcillatorcontrolsfor a cw output frequencyof 500 MHz and an amptitudeof +20 Oe;1V at the 75O INPUT.

d.lf necessary,set th€ cAL AMPL adjustmentfor 5 divisionson the SpectrumAnalyzerdisplay.

e.Resetthe sweeposcillatorcontrolslor a sweep outputfrom 0.01GHz-l GHz. Enablesinglesweepon the sweeposcillator,and activateMAX HOLD.

f.Make a note of the highestand lowestpeaksfor latercomparison,thendeactivateMAX HOLD.

S, Reconnectthe test equipmentas shownin Fig- ure4-25. ResetCENTERFREQUENCyto 10 MHz.

h.Set the SpectrumAnalyzercontrolsas follows, then set the generatorcontrolsfor a +20 dBmVof the signalat 10 MHz.

CENTERFREOUENCY 10 MHz

SPAN/DfV	500 kHz
RESOLUTION	1 MHz
REFLEVEL	+23 dBmV
VERTTCAL	1 dBlDlV
DTSPLAY
MINRF ATTENdB	O
TMEIDIV	AUTO
PEAK/AVERAGE	FullyCounterclockwise

i.Manually tune the Signal Generator towards 5 MHz while simultaneouslytuningthe CENTERFRE- QUENCYcontrol to hold the signat at center screen. Makea noteof the highestand lowestpeaks.

j.calculatethe halfwaypoint betweenthe highest and the lowestpeakfrom the peakdata notedin partsf andi.

k.Checkthat flatnessis within!2 dB from 5 MHz to 1000MHz.

SPECTRUTANALYZERUNOERTEST

SrclAL SOTRCE(5 ltHz-io tdHz]

E!- F

Figure 4-25. Equipment setup for checklng option 07 frequency response from 5 MHz to 10 MHz-

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