Tektronix 494AP service manual O a o, O o o, O o a o

o a o a o

O

I

494A1494APServiceVot.1

LIST OF TABLES

I

O

o

o

I

o

It

I

I

I

I Io

I

o a

I

o

t

o

I

t

a o o o a o

I

o o o o o

Table			page
1-1	TEKTRON'XWAVEGUIDE
		MIXERS	1-3
2-1	FREQUENCY
	RELATED
	CHARACTERTSTTCS	..................	2-1
2-2 AMPLITUDERELATED
2-3	CHARACTERTSTTCS	.................	2_6
	INPUTSIGNAL
24	CHARACTERTSTTCS	..................	2 11
	OUTPUTSIGNAL
2-5	CHARACTERTSTICS	........	,.........2 13
	GENERALCHARACTERTSTTCS
		...................
2-6	POWERREQUTREMENTS		2	15
		............................
			2_15

2.7ENVIRONMENTAL

	CHARACTERTSTTCS			,
2-8	pHySIcALCHARACTERISTCS			2-16
				2-17
4.1	EQUIPMENTREQUIRED		..........		4-2
4.2	CENTERFREQUENCY
		ACCURACY
	pOtNTS
4-3	CHECK	(1stLO UNLOCKED)		4-a
	SPAN/DVVERSUSTIME
	MARKERSFORSPAN/DIV
44	ACCURACYCHECK				4-11
	FREQUENCYRESPONSE
		CHECK
	SETTINGSFOR		,..........4-17
4.5		BANDS3_5
	OTO 30 dB RFATTENUATOR
	TESTSETTNGS			4-22
4.6 30 TO 60 dB RF ATTENUATOR
4-7	TESTSETTINGS			..4-2g
	CORRECTION
		FACTORTO
4-8	DETERMINETRUESIGNALLEVEL			4-25
	SENSlTlury		.........		4_27
5-1	EQUIPMENTREQUIRED		..........	5-2
5-2	powER suppLy ToLERANCES			5_3
5-3	FTLTERADJUSTMENTS
		...............................
5-4 EXTMIXERBANDLEVELING				5-1I
	ADJUSTMENTS		..........	5-25
6-1 RELATIVESUSCEPTIBILITY
		TO
6-2	STATTCDTSCHARGEDAMAGE			6	1
	SERVICEKITSANDTOOLS			....6-3
6-3	POWER			......6.8
64	SUPPLYRANGES
	SELECTEDCOMPONENTS			6-16
6-5	SERVICINGTOOLSFORBOARDS
	WITHSURFACEMOUNTED
	COMPONENTS				6 _ 17

Table		page
6-6 EQUIPMENTREQUIREDFORRETURN
	LOSSADJUSTMENT	6-27
6-7 EOUIPMENTREQUIREDFOR
	2ndLOCALIBRATION	6-94
6-8 EQUIPMENTREQUIREDFOR
	CALIBRATINGTHE16-20 MHz
	PHASELOCKCtRCUtr	6-39
6-9 EQUIPMENTFORADJUSTING
	FIRSTCONVERTERBIASAND
	STARTSPURAMPLITUDE	645
6-10 OPTIONSWTTCHSETTTNGS		...6-50
6-11	RAMTEST	6-51
6-12	ROMTEST	6-51
6.13 INSTRUMENTBUSREGISTERS		6-57
6.14	AUXILIARYSYNTHESIZERVALUES
	AS A FUNCTTONOF N ANDA	6-62
6-15 FRONT-PANELREGrSTERS		6-62
7-1 zNDCONVERTERtF SELECTTON		7_7
7-2 SWITCHANDAMPLIFIER
7.3	SELECTION	7-1s
	BANDWIDTH	7.23
	SELECTION
7-4 GAINSTEPCOMBTNATTONS		7-27

7.5PROGRESSIONOF

cAlN REDUCTTON.......... .........7_30

7.6FILTERCOMPONENTCOMBINATIONS......7.38

7	-7	RFTNTERFACELTNES		7-49
7	-8	U2039TRUTHTABLE	7	-49
7	-9	CONTROLPORT	..7-57
7	-1O	ADDRESS/DATAPORT		7-57
7.1'I SWEEPRATESELECTIONCODES				7-61
7	-12	TRtccERSELECTTONMODES	,...7-62
7	-13	SWEEPHOLDOFFSELECTON....,..............7-62
7.'14CALIBRATIONCONTROL
		SELECTTONCODES	7	-66
7	- 15 AfiENUATIONSELECTIONCODES		7.67
7-16		u4017oUTPUTLTNES	7	-68
7	-17	u5031oUTPUTLrNES		7-70
7	-18	PRESELECTORFREQUENCYBANDS..,...,7.-71
7	-19	ADDRESS70 FORMATS	7-75
7-20 DACTUNINGCODES				7-75
7-21 u2025oUTPUTLTNES			7-8s
7-22		POLLBITS	7-93
7-23 ROMBANKSELECTTONDATA			7-97
7-24		FRONTPANELSW'TCHMATRIX
		CoDE/FUNCTONTABLE	7-101

o o

xltl