Tektronix 494AP Rrttl, Optioninstruments, I3fil l t r l, CheckHORIZOUTPUTSignatLevel

PerformancecheckProcedure- 4g4Al4g4ApservrceVor.I

29.CheckVERTOUTPUTSignal

(0.5V *5% per divisionof disptayfromthecenter line)

a.Monitor the VERT OUTPUTwith a dc_coupted test oscilloscope.

b.S€t the test oscilloscopecontrolsfor a sensitivity of 1 V/div anda sweeprate of 10 ms.

c.Set the SpectrumAnalyzercontrolsas follows:

CENTERFREQUENCY 100MHz

SPAN/DV100kHz RESOLUTTONBANDWTDTH 100kHz

REFLEVEL-20dBm

VERTICALOISPLAY 2 dB/DIV

VIEWA and VEWB Off

TRIGGERINGFREERUN

TrME/DlVAUTO

d.Applythe cAL oUT signatto the RF tNpUTand verify that the signal amplitudeis full screen. lf not, performthe <Blue-SHIFT>CAL routine.

e.check that the amplitudeof the VERTouTpuT signal is 4 V peak-to-peak+0.2 V centered around 0 Vdc as disptayedon the test oscilloscope.SeeFigure 4-23.

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b.Set TIME/DVto MNL, and vary the MANUAL SCANcontrolfor a five divisionbeamdeflectionleft and right of centerscreen. Note the voltageswe€p on the test Oscilloscopeas the MANUALSCAN control is varied.

c.check that the output voltagevaries5 v *.10"/o peak-to-peak,centeredaround0 Vdc,

d.Resetthe TtMEiDtv to AUTo. Disconnectand removethe test equipment.

OPTIONINSTRUMENTS

31.Check Option 07 Calibrator Output (+20dBmVr0.5 dB)

a.Connect the 50O port of the 75o to 50o MinimumLossAttenuatorto a 100MHz50O source.

b.Monitor the 75o port of the 75o to 50o MinimumLossAttenuatorwith the powermgter.

c.Set the generatoroutput levelfor a readingof -28.95dBmon the powermeter.

d.Disconnectthe power meterfrom the 7SO port and connectthe 75O port to the 75O INPUTof the SpectrumAnalyzervia a 75O cable.

e.Setthe SpectrumAnalyzercontrolsas follows:

CENTERFREOUENCY 100MHz

sPAN/DrV500kHz RESOLUTIONBANDWIDTH 1 MHz

REFLEVEL+18dBmV

MINRFATTENdB0

VERTICALDISPLAY 1 dB/DrV

TrME/DlVAUTO

PEAK/AVERAGEFullyClockwise

Flgure 4-23. Test oscllloscope dlsplay of VERT output wlth a full screen dlsplay on the Spectrum Analyrer.

30.CheckHORIZOUTPUTSignatLevel

(0.5V/division*syo eithersid-eof center)

a.Monitorthe HORIZOUTPUTwith a dc_coupted testoscilloscope.

f.Set the AMPLCAL controlon the SpectrumAnalyzer for a O-divisionexcursionof the signal.

g.Removethe 75O cablefrornthe 75O port ot the 75O to 50O MinimumLossAttenuatorandconnectit to the CAL OUTconnectoron the SpectrumAnalyzer(CAL OUTto 75o INPUT).

g. Checkthat the displayis 6 divisions*0.5 dB.

i.Set the Spectrum Analyzer REF LEVEL to +20 dBmVand reset the the AMPL CAL controlfor an 8-divisionexcursionof the signal.

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