Tektronix 494AP service manual O o o o, Electricalcharacteristics

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Section2 - 494A1494ApService,Vol. 1

SPECIFICATION

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This section includesthe eiectrical,physical,and environmentalcharacteristicsof this insirument.Any instrumentspecificationchanges due to options ari listedin the Optionssectionof this manual.

ELECTRICALCHARACTERISTICS

- The followingtablesof electricalcharacteristicsand featuresapplyto the spectrumanalyzeraftera 3O_minute warm up and after doing the front-panelCAL adjust_ ments,exceptas noted.The performance

Requirement

columndefinessomecharacteristicsin quantitativeterms and in limitform.The Supplementallnformationcolumn explainsperformancerequirementsor providesperfor-

mance informationStatements.in this columnare not consideredto be guaranteedperformanceand are not ordinarilysupportedby a performance

checkprocedure. P.roceduresto verifyperformancerequirementsare pro_ videdin the PerformanceCheckportionof thrsmanual.

The instrumentperformsan internalcalibrationcheck eachtirnepoweris turnedon. Thischeckverifiesthat the instrumentfrequencyand amplitudeperformanceis as specified.An InstrumentCheck Out procedure,which requireslittleexternaltest equipmentor technicalexper- tise, is providedin Section5 of the OperatorsManual. This procedurewill satisfy most incominginspections and will helpfamiliarizeyou with the instrurnentcapabili- ties.

Verification of Tolerance Values

Performcompliancetests of specifiedlimits,listedin the PerformanceRequirernentcolurnn,only after a 30_ minutewarm-uptime(exceptas noted)andattera doing the front-panelCAL procedureUse. measurementinstru-

mentsthat do not affectthe valuesmeasuredMeasure. _ ment toleranceof test equipmentshouldbe negligible when comparedto the specifiedtolerancelf. the toler_ ance is not negligible,add the error of the measuring deviceto the specifiedtolerance.

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Table 2-1

FREOUENCYRELATEDCHARACTERISTICS

Characteristic	PerformanceRequirement	Supplemental Intormation
CenterFrequency
OperatingRange
InternalMixer	10 kHz - 21 GHz
	Tuned	by the CENTER/MARKER
	FREQUENCY control or the DATA
ExternalMixers (optional)	ENTRYpushbuttons
	10kHz-325GHz
Accuracy(after front-panelCAL
	Center	Frequency Accuracy is
hasbeenperformed)
	specifiedby two characteristics:

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lnitial(start of sweep)

Bands 1 & 5 - 12 with SPANiDIV >200 kHz, and Bands 2-4 with SPAN/DV > 1 0 0 k H z

(1st LO unlocked)

		. initialaccuracy (firmwarecorrected)
		o center frequencydrift during the sweep
*{2Oo/oD+ (CF x REF)+ 15N kHz)		Refer to	lF Frequency, LO Range,
Where:		and Harmonic Number specification
		later in this		table for the N value
D : SPAN/DVor RESOLUTTON
BANDWIDTH, whichever is Allow a settling time of one second
greater		for each GHz change in CF within a
CF -	CenterFrequency	band . In bands 4 - '12,divide the CF
REF	Reference Frequency change by N.
Error

N : HarmonicNumber

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2-1