Tektronix PS280 User manual

TEKPartNo.070-8356-00
ProductGroup3M
&PS283
LABORATORYDC
POWERSUPPLY
WARNINGI
Thefollowingservicinginstructions
areforusebyqualifiedservice
personnelonly.Toavoidpersonal
injury,donotperformanyservicing
unlessyouarequalifiedtodoso.
RefertotheSafetySummaryprior
toperforminganyservice.
ServiceReference
Please check for CHANGE INFORMATION
at the rear of this manual.
FirstPrintingJUL1991
RevisedAUG1991Tektronix
COMMTTCD TO EXEa_LB\CE

Copyright© 1991 Tektronix,Inc.Allrights reserved. Contentsofthis
publicationmaynotbereproducedinanyformwithoutthewritten
permissionofTektronix,Inc.
Productsof Tektronix, Inc.,anditssubsidiariesarecoveredbyU.S.
andforeignpatentsissuedandpending.
TEKTRONIX,TEK,SCOPE-MOBILE,andW2S areregistered
trademarksofTektronix,Inc.
Printedin U.S.A. Specificationandpricechangeprivilegesare
reserved.
INSTRUMENTSERIALNUMBERS
Eachinstrument hasa serialnumber ona panelinsert, tag,or
stampedonthechassis.Thefirsttwodigitsdesignatethecountryof
manufacture.Thelastfivedigits of theserialnumberareunique to
eachinstrument.Thecountryofmanufactureisidentifiedasfollows:
B000000Tektronix,Inc.,Beaverton,Oregon, U.S.A.
E200000TektronixUnitedKingdom,Ltd.,Marlow
G100000TektronixGuernsey,Ltd.,ChannelIslands
HKOOOOOHongKong
H700000TektronixHolland,NV,Heerenveen,
TheNetherlands
JPOOOOOSony/Tektronix,Japan
TWOOOOOTaiwan

WBWtfitiAnnnrinn contents
Specifications
OperatingInformation
Theory of Operation
OperatorsandServiceSafetySummary
Xi
SymbolsandTerms xi
SpecificPrecautions xii
ProductDescription 1.1
General - -|_i
Specifications 1_2
GeneralOperatingInstructions 2-1
FrontPanel 2-1
TheVariablePowerSupplies 2-2
TheFixedVoltagePowerSupply 2-3
RearPanel 2-4
Theory of Operation 3.1
General 3.1
CircuitDescription 3-1
MasterVoltageOutput 3-1
SlaveVoltageOutput 3-2
5 V FixedVoltageOutput 3-4
PS280 & PS283LaboratoryDCPowerSupplyModule-LevelServiceManualREVAUG1991

PerformanceVerification
Preparation4-1
RequirementsforPerformance4-1
Warm-upPeriod4-1
Access4-1
TestEquipment4-1
EquipmentRequired4-2
PerformanceTests4-3
ConstantCurrentLoadRegulation4-3
ConstantCurrentRippleandNoise4-5
ConstantVoltageRegulation4-7
Adjustment
Maintenance
Preparation5-1
RequirementsforPerformance5-1
Personnel5-1
Warm-upPeriod5-1
Access5-1
TestEquipment5-1
AdjustmentProcedures5-3
IndependentMode5-3
SeriesTrackingMode. «.5-5
ParallelTrackingMode5-6
5V Fixed5-7
Information6-1
HelpfulProcedures6-1
PreventingESD6-1
InspectionandCleaning6-5
GeneralCare6-5
InspectionandCleaningProcedures6-5
InspectExterior6-5
CleaningProcedure- Exterior6-6
InspectInterior6-6
CleaningProcedure— Interior6-7
Lubrication6-8
REVAUG 1991Contents

Options
PartsList
Diagrams
Index
RemovalandInstallationProcedures6-9
Preparation- PleaseRead6-9
ListofModules6-9
GeneralInstructions6-10
TopCoverRemoval6-10
SlaveCircuitBoardRemoval6-12
FuseCircuitBoardRemoval6-13
ACSelectorCircuitBoardRemoval6-14
MasterCircuitBoardRemoval6-16
FrontPanelDisplayCircuitBoardsAssemblyRemoval6-17
FrontPanelControlsCircuitBoardRemoval6-19
OutputConnectorsCircuitBoardRemoval6-21
PowerTransistorCircuitBoardsRemoval6-23
OptionsandAccessories7-1
PowerCordOptions 7-1
StandardAccessories7-1
OptionalAccessories7-1
PartsList8-1
PartsOrderingInformation8-1
ModuleReplacement8-1
UsingthePartsList8-2
ItemNames8-2
IndentationSystem8-2
Abbreviations8-2
DiagramsandCircuitBoardIllustrations9.1
ComponentValuesg_1
PS280& PS283LaboratoryDCPowerSupplyModule-LevelServiceManualREVAUG1991

WM§$XfX¥\rUlJ ListofIllustrations
Figure 2-1: PS280orPS283FrontPanel2-1
Figure2-2:VariablePowerSupplyControls2-2
Figure2-3:FixedPowerSupplyControls2-3
Figure2-4:PS280orPS283RearPanel2-4
Figure 3-1: PS280orPS283VariableOutputsBlockDiagram3-3
Figure3-2:PS280orPS2835 V BlockDiagram3-4
Figure 4-1: ConstantCurrentTestSetup4-3
Figure4-2:ConstantCurrentRippleandNoiseTestSetup4-5
Figure4-3:ConstantVoltageTestSetup4-7
Figure 5-1: MasterCircuitBoardAdjustmentLocations5-8
Figure5-2:DisplayAssemblyCircuitBoardAdjustmentLocations...5-9
Figure5-3:FrontPanelControlsCircuitBoardAdjustmentLocations. 5-9
Figure 6-1: TopCoverRemoval6-11
Figure6-2:SlaveandFuseCircuitBoardRemoval6-13
Figure6r3:ACSelectorandMasterCircuitBoardRemoval6-15
Figure6^4:FrontPanelDisplayAssemblyRemoval6-18
Figure6-5:FrontPanelControlsAssembly6-20
Figure6-6:OutputConnectorsCircuitBoard
andPowerSwitchLocation6-22
Figure6-7:PowerTransistorCircuitBoardsLocation6-23
Figure 8-1: ExplodedViewA 8-8
Figure8-2:ExplodedViewB 8-16
PS280 & PS283 Laboratory DC PowerSupply Module-LevelServiceManualREVAUG1991 vii

WMMfflfWinnnnj ust ofTables
Table1-1:OperationalCharacteristics1-2
Table1-2:PhysicalCharacteristics1.3
Table1-3:EnvironmentalCharacteristics1-3
Table1-4:ElectricalCharacteristics1-3
Table 4-1: TestEquipment4-2
Table4-2:LoadResistorValuesforCurrentChecks4-4
Table4-3:LoadResistorValuesforRippleChecks4-6
Table4-4:LoadResistorValuesforVoltageChecks4-8
Table 6-1: RelativeSusceptibilitytoStatic-DischargeDamage6-3
Table6-2:ExternalInspectionCheckList6-6
Table6-3:InternalInspectionCheckList6-7
Table6-4:ToolsRequiredforModuleRemoval6-10
PS280& PS2S3LaboratoryDCPowerSupplyModule-LevelServiceManual;x

OperatorsandServiceSafetySummary
Pleasetakea momenttoreviewthesesafetyprecautions.Theyareprovided
foryourprotectionandtopreventdamagetothepowersupply.Thissafety
informationappliestoalloperatorsandservicepersonnel.
SymbolsandTerms Thesetwoterms appear in manuals:
•l^°!L\ statementsidentifyconditionsorpracticesthatcouldresultin
damagetotheequipmentorotherproperty.
• Ittwwws * statementsidentifyconditionsorpracticesthatcouldresultin
personalinjuryorlossoflife.
Thesetwotermsappearonequipment:
• CAUTION indicatesa personalinjuryhazardnotimmediatelyaccessibleas
onereadsthemarking,ora hazardtopropertyincludingtheequipment
• DANGER indicatesa personalinjuryhazardimmediatelyaccessibleasone
readsthemarking.
Thissymbolappearsinmanuals:
®
Static-SensitiveDevices
Thesesymbolsappearonequipment:
DANGER
HighVoltageProtective
ground(earth)
terminal
ATTENTION
manual
PS280& F32S3LaboratoryDCPowerSupplyModule-LevelServiceManualxl

SpecificPrecautionsObserveallofthefollowingprecautionstoensureyourpersonalsafetyandto
preventdamagetoeitherthePS280orPS283LaboratoryDCPowerSupplyor
equipmentconnectedtoit.
DoNotPerformServiceWhileAlone
Donotperforminternalserviceoradjustmentofthisproductunlessanother
personcapableofrenderingfirstaidandresuscitation ispresent.
UseCareWhenServicingWithPowerOn
Dangerousvoltagesexistatseveralpointsinthisproduct.Toavoidpersonal
injury,donottouchexposedconnectionsorcomponentswhilepowerison.
Disconnectpowerbeforeremovingprotectivepanels,soldering,orreplacing
components.
PowerSource
ThePS280orPS283LaboratoryDCPowerSupply isintendedtooperatefrom
apowersourcethatwillnotapplymorethan250V rmsbetweenthesupply
conductorsorbetweeneithersupplyconductorandground.A protective
groundconnection,throughthegroundingconductorinthepower cord, is
essentialforsafesystemoperation.
Groundingthepowersupply
ThePS280orPS283LaboratoryDCPowerSupply isgroundedthroughthe
power cord. Toavoidelectricshock,plugthepowercord intoa properlywired
receptaclewhereearthgroundhasbeenverifiedbya qualifiedserviceperson.
DothisbeforemakingconnectionstotheoutputterminalsoftheLaboratoryDC
PowerSupply.-
Withouttheprotectivegroundconnection,allpartsofthePS280orPS283
LaboratoryDCPowerSupply arepotentialshockhazards.Thisincludesknobs
andcontrolsthatmayappeartobeinsulators.
UsetheProperPowerCord
Useonlythepowercord andconnectorspecifiedforyourproduct.Useonlya
powercordthatisingoodcondition.
UsetheProperFuse
Toavoidfirehazard,useonlythefusespecifiedinthepartslistforyour prod-
uct,andwhichisidenticalintype,voltagerating,andcurrentrating.
REVAUG1991OperatorsandServiceSafetySummary

DoNotRemoveCoversorPanels
Toavoidpersonalinjury,donotoperatethePS280orPS283LaboratoryDC
PowerSupplywithoutthepanelsorcovers.
DoNotOperateinExplosiveAtmospheres
ThePS280orPS283LaboratoryDCPowerSupplyprovidesnoexplosion
protectionfromstaticdischargesorarcingcomponents.Donotoperateinan
atmosphereofexplosivegasses.
PS280& PS283LaboratoryDCPowerSupplyModule-LevelServiceManualxll!

BmMfJWnr Specifications

#%f%M_rLTLnProductDescription
Thissubsectionbeginswitha generaldescriptionofthePS280orPS283
PowerSupply.TheSpecificationssubsectionimmediatelyfollows.
General TheTektronixPS280orPS283LaboratoryDCPowerSupply isa multifunction
benchorportableinstrument.Thisregulatedpowersupplyprovidesa fixed5 V
outputforpoweringlogiccircuitsandtwovariableoutputsfora widevarietyof
testandexperimentaluses.ThePS280orPS283canbeusedinanyapplica-
tionwherethreeindependentpowersupplieshousedina singlepackage
representa convenience.
ThePS280orPS283containstwoidentical,independentlyadjustableDC
powersuppliesthatyoucanvaryfrom0 to30 V. ThecurrentonthePS280
variablepowersuppliesvariesfrom0 to2 A.ThecurrentonthePS283 vari-
ablepowersuppliesvariesfrom0 to 1 A.Inallotherrespectstheinstruments
areidentical.Unlessotherwisenoted,descriptionsandproceduresinthis
manualapplytobothinstruments.
Frontpanel switchesselectoneofthreemodesofoperation:independent,
series,orparallel.Intheindependentmode,theoutputvoltageandcurrentof
eachsupplycanbecontrolledindependently.Inthetwotrackingmodes,the
variableoutputsareconnectedeitherinseriesorinparallel.Underthese
circumstances,thecontrolsofthemasterpowersupplyadjustthevoltagesor
currentofbothpowersupplies.Seriesmodeallowsthepowersuppliestobe
variedfrom0 to60V at0 to2 A forthePS280,or0 to 1 A forthePS283.
Parallelmodeallowsthepowersuppliestobevariedfrom0 to4 A forthe
PS280at0 to30 V, orfrom0 to2 A at0 to30V forthePS283.
PS280& PS283LaboratoryDCPowerSupplyModule-LevelServiceManual REV AUG1991 f-f

ProductDescription
SpecificationsTable1-1:OperationalCharacteristics
Characteristic
Outputs
Voltage(5V)
Voltage(0-30V)
Line regulation(5V)
Line regulation(CV)
Line regulation(CC)
Loadregulation(5V)
Loadregulation(CV)
Loadregulation(CC)
Ripple/noise(5V)
Ripple/noise(CV)
Ripple(CC)
Temperaturecoefficient(CV)
Recoverytime(CV)
Trackingerror(slave)
Indicator
Meterindicators
Insulation(chassistoterminals)
Insulation(chassistoACcord)
Measurement
Two0 to30 VDC, one5 VDC
5.0±0.25VDCat3.0A maximumfoldbackcurrentlimited
0-30constantVDCat2.0constantA maximum(PS280)or1.0
constantA maximum(PS283)
<5mV
<0.01% +3mVPS280
<0.01% + 5 mVPS283
<0.2% +3mA
<0.2%
<0.01% + 3 mV(ratingcurrent<3A)
<0.01% +5mV(ratingcurrent>3A)PS280
<300mV(0-60V singleseriestrackingsupply)
<0.2% +3mA
<2mVrms
<1mV rms, 5 Hz-1MHz
<3mArms
<300ppm/°C
<100p.s(timetorecoveraftera 50%loadchangewith0.5A
minimum)
<0.5% -f-10mVofthemastersupply
Two31/2digits0.5in.LEDpaneldisplaymeter
0-30VDC±(0.5%ofRDG+ 2 digits)
0-2A ±(0.5%ofRDG+ 2 digits)
>20MHatDC500V
>30MXlatDC500V
REVAUG1991Specifications

ProductDescription
Table1-2:PhysicalCharacteristics
Dimension
Width
Height
Depth
Weight
Characteristic
Storage
Operating
Characteristic
Line voltage
Powerconsumption
Measurement
255mm(10.0in)
145mm(5.7in)
335mm(13.2in)
11.5kg(25.4Ib)PS2809.0kg(19.9Ib)PS283
Table1-3:EnvironmentalCharacteristics
TemperatureRelativeHumidity
-10°Cto+70°C70%
0°Cto40°C80%
Table1-4:ElectricalCharacteristics
Measurement
90to110
108to132
198to242
216to250,allVACat50-60Hz
348VA,250W maximum(PS280)
254VA,172W maximum(PS283)
PS2S0& P5283LaboratoryDCPowerSupplyModule-LevelServiceManual
REVAUG 1991

IHFLTOperatingInformation

WWXtX GeneralOperatingInstructions
ThissectiondescribesthecontrolsonthefrontandrearpanelsofthePS280
orPS283LaboratoryDCPowerSupply.
FrontPanelFigure
2-1 showsthefrontpaneloftheinstrument.
LABORATORY
DCPOWERSUPPLY ////TWCmniXPS280
CCPOWER SUPPLY/
Figure 2-1: PS280orPS283FrontPanel
1. Thepowerswitchturnsontheinstrumentwhenpressed.Whenyoupress
itagain,theinstrumentisturnedoff.
2. TheswitcheslabeledTRACKINGdeterminethetestmodeoftheinstru-
ment.ThePS280orPS283featurestwotrackingmodes:seriesand
parallel. Ifbothpush-buttonswitchesaredisengaged(out),thetwo vari-
ablepowersuppliesoperateindependently.Iftheleftswitchispushedin,
theinstrumentoperatesinseriesmode.Ifbothswitchesarepushedin,the
instrumentoperatesinparallelmode.
Inseriesmode,themasterpowersupplycontrolsthevoltageforboth
powersupplies,whichcanthenrangefrom0 to60V.
Inparallelmode,themasterpowersupplycontrolsboththevoltageand
thecurrentforbothpowersupplies.Thecurrentcanthenrangefrom0 to
4A(0to2AforthePS283).
PS2S0& PS283LaboratoryDCPowerSupplyModule-LevelServiceManual
REVAUG 1991

GeneralOperatingInstructions
3.Thesecontrolsaffecttherightvariablepowersupply.Iftheinstrumentisin
atrackingmode,therightpowersupplyisthemaster.Ina trackingmode,
eitherorbothofthecontrolknobscanaffectbothvariablepowersupplies.
4. Thesecontrolsaffecttheleftvariablepowersupply.Iftheinstrumentisina
trackingmode,theleftpowersupplyistheslave.Ina trackingmode,
eitherorbothofthecontrolknobshavenoeffect.
5.Thesecontrolsaffectthefixed5 V powersupply.
TheVariablePowerSupplies
Figure2-2showsthecontrolsforthemastervariablepowersupply.
CURRENTVOLTAGE
Figure2-2:VariablePowerSupplyControls
1. Theoutputterminalsforthepowersupplyallowyoutopluginthetest
leads. Theredoneontherightisthepositivepolarityoutputterminal.Itis
indicatedbya + signaboveit.
Theblackoneontheleftisthenegativepolarityoutputterminal.Itis
indicatedbya - signaboveit.
Thegreenoneinthemiddleistheearthandchassisground.
2. Thevoltagecontrolknoballowsyoutosettheoutputvoltageforthe
powersupply.
3.Thecurrentcontrolknoballowsyoutosettheoutputcurrentforthepower
supply.
4. IftheC.V.lightislighted,thepowersupplyisproducinga constantvolt-
age. IftheC.C.lightislighted,thepowersupplyisproducinga constant
current.
REVAUG 1991OperatingInformation

GeneralOperatingInstructions
5.TheLEDdisplaylightswhentheinstrumentisturnedon.Thenumbers
indicatethevoltageorcurrentproducedbythevariablepowersupply.
6.TheAMPS/VOLTSmeterselectionswitchdetermineswhethertheLED
displayshowsthecurrentorthevoltage.Iftheswitchispushedtotheleft,
thedisplayshowsthecurrent.Iftheswitchispushedtotheright,the
displayshowsthevoltage.
Themeterselectionswitchistotherightofthecorrespondingdisplayforthe
slavevariablepowersupply.Allothercontrolsarethesameforbothvariable
powersupplies.
TheFixedVoltagePowerSupply
Figure2-3showsthecontrolsforthefixedvoltagepowersupply.
5VFIXED3A
Figure2-3:FixedPowerSupplyControls
1. Theoutputterminalsforthepowersupplyallowyoutopluginthetest
leads. Theredoneontherightisthepositivepolarityoutputterminal.The
blackoneontheleftisthenegativepolarityoutputterminal.
2. Theoverloadindicatorlightswhenthecurrentonthe5 V powersupply
becomestoolarge.
PS280& PS2S3LaboratoryDCPowerSupplyModule-LevelServiceManual REV AUG1991 2-3

GeneralOperatingInstructions
RearPanelFigure
2-4 showstherearpanel of theinstrument.
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Ss
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BEAVEHTON.,OH,U.SA
1UKXTAIWAMJI.0.C
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Figure2-4:PS280 or PS283RearPanel
1. Thesetwoswitchesallowyou to settheinstrumentforthecorrectline
voltage.Pushthetopswitch to theleft if thelinevoltage isin therange of
100 to 120 V; push itto theright If thelinevoltage isin therange of 220 to
Thebottomswitchdetermineswhetherthelinevoltage is Intheloworthe
highend of thevoltagerange.Push itto theleft if yourlinevoltage isat
thelowend of therange-100 or 220 V; push itto theright if yourline
voltage isat thehighend of the range -120 or 240V.
2. This is thefuseholder.Pullthemiddletabdownandout to openthefuse
holdertoensurethatyouareusingthecorrectfuse.This is alsohowyou
changethefuse.
3.This is thereceptacleforthepower cord.
OperatingInformation

BBSftXfTTheory ofOperation