Tektronix 494A PerformanceCheckprocedure- 4g4A/4g4ApServiceVol. l, Resolutton, Bandwtdth 1 MHz

PerformanceCheckprocedure- 4g4A/4g4ApServiceVol. l

Speclnm Andyrcr Undcr Tcst

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Figure4'20.Testequlpmentselupfor checkingIntemaltrlggercharacteri3tica.

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b. Setthe SpectrumAnalyzercontrolsas follows:

CENTERFREQUENCY 100MHz

SPAN/DIV10 kHz

RESOLUTTON
BANDWTDTH 1 MHz
REFLEVEL	-30 dBm
VERTICALDISPLAY	LIN
TRIGGERING	INT
TIME/OIV	S ms
VIEWA andVEWB	Off

_ c. Set the signal source output amplitude for -30dBm, and an output frequencyof 100MHz. Note that the signalsourcewill be modulatedby the function

9enerator.

d.Decreasethe output of the signalsourceso the displayis half screentthen rnodulatethe signalsource with a 1 kHz sinewave.

e.ActivateZEROSPANand,if necessary,resetthe CENTERFREQUENCYcontrolfor maximumresponse.

f.Set the function generatoroutputfor a modula_ tion amplitudeof two divisions.

g.Checkth€ internaltriggeroperationin the 15 Hz through1 MHzfrequencyrange.

Becauseof deflection amplifierresponse, the displayamplitudewill decreaseat the high frequencyend. The triggeringsignal

can also be appliedto the MARKER/VIDEO connectoron the rear panel if a jumper is

connected between pins 1 and 5 (Video Select) of the r€ar-panel ACCESSORIES connector(Figure4-21).

h.Connectthe test equipmentas shown in Figure

4-22.

i.Set the function generatoroutput frequencyat 1 kHz, and output level at 2 V peak-to-peak,as indi- catedon th€ test Oscilloscope.

j.ActivateEXTTRIGGERNG.

k.Check that the sweep is triggeredover the fre- quencyrangeot 15 Hz to 1 MHz.

I.REIUTNthE TRIGGERINGtO FREE RUN ANd disconnectthe test equipment.

28. Check External Sweep Operation

{Oto t0 V (dc + peak ac) *1 V for a lull screen deftection)

This is an operationalcheck, not a performance requirement.

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4-32

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