B&K Precision 8550 User Manual

2

SafetySummary

Thefollowingsafetyprecautionsapplytobothoperatingandmaintenancepersonnelandmustbefollowed

duringallphasesofoperation,service,andrepairofthisinstrument.

Beforeapplyingpowertothisinstrument:

•Readandunderstandthesafetyandoperationalinformationinthismanual.

•Applyallthelistedsafetyprecautions.

•Verifythatthevoltageselectoratthelinepowercordinputissettothecorrectlinevoltage.Operating

theinstrumentatanincorrectlinevoltagewillvoidthewarranty.

•Makeallconnectionstotheinstrumentbeforeapplyingpower.

•DonotoperatetheinstrumentinwaysnotspeciedbythismanualorbyB&KPrecision.

Failuretocomplywiththeseprecautionsorwithwarningselsewhereinthismanualviolatesthesafety

standardsofdesign,manufacture,andintendeduseoftheinstrument.B&KPrecisionassumesno

liabilityforacustomer’sfailuretocomplywiththeserequirements.

Categoryrating

TheIEC61010standarddenessafetycategoryratingsthatspecifytheamountofelectricalenergy

availableandthevoltageimpulsesthatmayoccuronelectricalconductorsassociatedwiththesecategory

ratings.ThecategoryratingisaRomannumeralofI,II,III,orIV.Thisratingisalsoaccompaniedbya

maximumvoltageofthecircuittobetested,whichdenesthevoltageimpulsesexpectedandrequired

insulationclearances.Thesecategoriesare:

CategoryI(CATI):Measurementinstrumentswhosemeasurementinputsarenotintendedtobe

connectedtothemainssupply.Thevoltagesintheenvironmentaretypically

derivedfromalimited-energytransformerorabattery.

CategoryII(CATII):Measurementinstrumentswhosemeasurementinputsaremeanttobeconnected

tothemainssupplyatastandardwalloutletorsimilarsources. Example

measurementenvironmentsareportabletoolsandhouseholdappliances.

CategoryIII(CATIII):Measurementinstrumentswhosemeasurementinputsaremeanttobe

connectedtothemainsinstallationofabuilding. Examplesaremeasurements

insideabuilding’scircuitbreakerpanelorthewiringofpermanently-installedmotors.

CategoryIV(CATIV):Measurementinstrumentswhosemeasurementinputsaremeanttobe

connectedtotheprimarypowerenteringabuildingorotheroutdoorwiring.

3

ElectricalPower

ThisinstrumentisintendedtobepoweredfromaCATEGORYIImainspowerenvironment.Themains

powershouldbe115VRMSor230VRMS.Useonlythepowercordsuppliedwiththeinstrumentand

ensureitisappropriateforyourcountryofuse.

Donotusethisinstrumentinanelectricalenvironmentwitha

highercategoryratingthanwhatisspeciedinthismanualforthis

instrument.

Youmustensurethateachaccessoryyouusewiththisinstrument

hasacategoryratingequaltoorhigherthantheinstrument’s

categoryratingtomaintaintheinstrument’scategoryrating. Failure

todosowilllowerthecategoryratingofthemeasuringsystem.

GroundtheInstrument

Tominimizeshockhazard,theinstrumentchassisandcabinetmust

beconnectedtoanelectricalsafetyground.Thisinstrumentis

groundedthroughthegroundconductorofthesupplied,three-

conductorAClinepowercable. Thepowercablemustbeplugged

intoanapprovedthree-conductorelectricaloutlet. Thepowerjack

andmatingplugofthepowercablemeetIECsafetystandards.

Donotalterordefeatthegroundconnection. Withoutthesafety

groundconnection,allaccessibleconductiveparts(including

controlknobs)mayprovideanelectricshock.Failuretousea

properly-groundedapprovedoutletandtherecommendedthree-

conductorAClinepowercablemayresultininjuryordeath.

Unlessotherwisestated,agroundconnectionontheinstrument’s

frontorrearpanelisforareferenceofpotentialonlyandisnot

tobeusedasasafetyground. Donotoperateinanexplosiveor

ammableatmosphere.

4

EnvironmentalConditions

Thisinstrumentisintendedtobeusedinanindoorpollutiondegree2environment.Theoperating

temperaturerangeis0∘Cto40∘Cand20%to80%relativehumidity,withnocondensationallowed.

Measurementsmadebythisinstrumentmaybeoutsidespecicationsiftheinstrumentisusedinnon-

oce-typeenvironments.Suchenvironmentsmayincluderapidtemperatureorhumiditychanges,sunlight,

vibrationand/ormechanicalshocks,acousticnoise,electricalnoise,strongelectricelds, orstrong

magneticelds.

Donotoperatetheinstrumentinthepresenceofammablegasesor

vapors,fumes,ornely-dividedparticulates.

Theinstrumentisdesignedtobeusedinoce-typeindoor

environments.Donotoperatetheinstrument

•Inthepresenceofnoxious,corrosive,orammablefumes,

gases,vapors,chemicals,ornely-dividedparticulates.

•Inrelativehumidityconditionsoutsidetheinstrument’s

specications.

•Inenvironmentswherethereisadangerofanyliquidbeing

spilledontheinstrumentorwhereanyliquidcancondenseon

theinstrument.

•Inairtemperaturesexceedingthespeciedoperatingtemperatures.

•Inatmosphericpressuresoutsidethespeciedaltitudelimitsor

wherethesurroundinggasisnotair.

•Inenvironmentswithrestrictedcoolingairow,eveniftheair

temperaturesarewithinspecications.

•Indirectsunlight.

Donotoperateinstrumentifdamaged

Iftheinstrumentisdamaged,appearstobedamaged,orifany

liquid,chemical,orothermaterialgetsonorinsidetheinstrument,

removetheinstrument’spowercord,removetheinstrumentfrom

service,labelitasnottobeoperated,andreturntheinstrumentto

B&KPrecisionforrepair.NotifyB&KPrecisionofthenatureofany

contaminationoftheinstrument.

Hazardousvoltagesmaybepresentinunexpectedlocationsin

circuitrybeingtestedwhenafaultconditioninthecircuitexists.

Cleantheinstrumentonlyasinstructed

5

Donotcleantheinstrument,itsswitches,oritsterminalswith

contactcleaners,abrasives,lubricants,solvents,acids/bases,

orothersuchchemicals. Cleantheinstrumentonlywithaclean

drylint-freeclothorasinstructedinthismanual. Notforcritical

applications

Donottouchlivecircuits

Instrumentcoversmustnotberemovedbyoperatingpersonnel.

Componentreplacementandinternaladjustmentsmustbemade

byqualiedservice-trainedmaintenancepersonnelwhoareaware

ofthehazardsinvolvedwhentheinstrument’scoversandshields

areremoved.Undercertainconditions,evenwiththepowercord

removed,dangerousvoltagesmayexistwhenthecoversare

removed.

Toavoidinjuries,alwaysdisconnectthepowercordfromthe

instrument,disconnectallotherconnections(forexample,test

leads,computerinterfacecables,etc.),dischargeallcircuits,and

verifytherearenohazardousvoltagespresentonanyconductors

bymeasurementswithaproperly-operatingvoltage-sensingdevice

beforetouchinganyinternalparts. Verifythevoltage-sensingdevice

isworkingproperlybeforeandaftermakingthemeasurementsby

testingwithknown-operatingvoltagesourcesandtestforbothDC

andACvoltages.

6

GeneralSafety

Donotattemptanyserviceoradjustmentunlessanotherperson

capableofrenderingrstaidandresuscitationispresent.

Donotinsertanyobjectintoaninstrument’sventilationopeningsor

otheropenings.

Thisinstrumentisnotauthorizedforuseincontactwiththehuman

bodyorforuseasacomponentinalife-supportdeviceorsystem.

Servicing

7

DonotsubstitutepartsthatarenotapprovedbyB&KPrecisionor

modifythisinstrument. ReturntheinstrumenttoB&KPrecisionfor

serviceandrepairtoensurethatsafetyandperformancefeatures

aremaintained.

Fusereplacementmustbedonebyqualiedservice-trained

maintenancepersonnelwhoareawareoftheinstrument’sfuse

requirementsandsafereplacementprocedures.Disconnectthe

instrumentfromthepowerlinebeforereplacingfuses. Replace

fusesonlywithnewfusesofthefusetypes,voltageratings,and

currentratingsspeciedinthismanualoronthebackofthe

instrument.Failuretodosomaydamagetheinstrument,leadtoa

safetyhazard,orcauseare.Failuretousethespeciedfuseswill

voidthewarranty.

Forcontinuedsafeuseoftheinstrument

•Donotplaceheavyobjectsontheinstrument.

•Donotobstructcoolingairowtotheinstrument.

•Donotplaceahotsolderingironontheinstrument.

•Donotpulltheinstrumentwiththepowercord,connectedprobe,orconnectedtestlead.

•Donotmovetheinstrumentwhenaprobeisconnectedtoacircuitbeingtested.

8

ComplianceStatements

DisposalofOldElectrical&ElectronicEquipment(ApplicableintheEuropeanUnionandother

Europeancountrieswithseparatecollectionsystems)

ThisproductissubjecttoDirective2002/96/ECoftheEuropean

ParliamentandtheCounciloftheEuropeanUniononwasteelectrical

andelectronicequipment(WEEE),andinjurisdictionsadoptingthat

Directive,ismarkedasbeingputonthemarketafterAugust13,2005,

andshouldnotbedisposedofasunsortedmunicipalwaste.Please

utilizeyourlocalWEEEcollectionfacilitiesinthedispositionofthis

productandotherwiseobserveallapplicablerequirements.

SafetySymbols

Symbol

Description

Indicatesahazardoussituationwhich,ifnotavoided,couldresultindeath

orseriousinjury.

Indicatesahazardoussituationwhich,ifnotavoided,willresultinminoror

moderateinjury.

Refertothetextnearthesymbol.

ElectricShockhazard

Alternatingcurrent(AC)

Chassisground

Earthground

IndicatestheInpositionofthepowerswitchwheninstrumentisON.

IndicatestheOutpositionofthepowerswitchwheninstrumentisOFF.

Indicatespracticesnotrelatedtophysicalinjury.

Table1SafetySymbols

Contents

1Introduction11

1.1ProductOverview11

1.2Contents12

1.3Features12

1.4Dimensions13

1.5FrontPanel15

1.6RearPanel15

2GettingStarted17

2.1PreliminaryInformation17

2.2InputPowerandFuseRequirements18

2.3FuseReplacement19

3BasicFrontPanelOperation20

3.1FunctionKeys21

3.1.1ModeKey21

3.1.2SystemKey22

3.1.3ShortKey22

3.1.4Lock/LocalKey&Screenshots23

3.2Softkeys23

4Modes24

4.1StaticMode25

4.1.1ConstantCurrent26

4.1.2ConstantVoltage27

4.1.3ConstantResistance28

4.1.4ConstantPower29

4.2TransientMode30

4.2.1Continuous30

4.2.2Pulse31

4.2.3Toggle31

4.3ListMode32

4.3.1ContinuousListOperation32

4.3.2CountListOperation32

4.3.3StepListOperation33

4.3.4FileConguration34

4.4CR-LEDMode35

4.5BatteryTestFunction36

4.6TimeTest38

10

4.7Over-CurrentProtectionTest(OCPT)39

4.8Over-VoltageProtectionTest(OVPT)41

4.9Over-PowerProtectionTest(OPPT)42

4.10LoadRegulationMode43

4.11SweepMode44

4.12AutomaticTestMode45

5System47

5.1SystemConguration48

5.1.1Language48

5.1.2BeepSound48

5.1.3Sense48

5.1.4Power-On48

5.1.5Display49

5.1.6Source50

5.1.7ExternalProgramming50

5.2Von/Vo50

5.3Protect51

5.3.1Over-VoltageProtection51

5.3.2Over-CurrentProtection51

5.3.3Over-PowerProtection51

5.3.4Delay51

5.4FileStore52

5.5CommunicationSetup53

5.6Limit54

6Handler55

6.1ONFunction56

6.2TRIG56

6.3VF/EXT-PROG56

6.4Pass/Fail56

7ServiceInformation57

8LIMITEDTHREE-YEARWARRANTY58

Introduction

1.1ProductOverview

8550: 150V/30A/175W8551: 150V/60A/350W

Figure1.1FrontView

The8550SeriesDCElectronicLoadsareversatileinstrumentsusedforstaticanddynamictestingof

DCpowersupplies,DC-DCconverters,batteries,batterychargers,etc.

Primarymodesincludeconstantvoltage(CV),constantcurrent(CC),constantresistance(CR),and

constantpower(CW).Awiderangeofdynamicloadingapplicationscanalsobesimulatedthroughuser-

programmableslewrates,loadlevels,duration,andconductingvoltage.

Further,transient,listmode,batterymode,andLEDmodesfurtherextendtestingcapabilities.Versatile

triggeringoptionsallowthedynamicloadbehaviortobesynchronizedwithotherevents.

TheDCloadisremotelyprogrammableviatheRS232serialinterface.Theserialinterfaceusesa

standard9pinDtypeconnector.FormoreinformationseesectionRS232Interface.

The8550Seriesalsoprovidesahandler.Thisinterfacecanbeusedtoreceiveexternaltriggersignals,

controlsignals,andoutputofinstrumentsortingresults.

Model85508551

VoltageRange0to150V0to150V

CurrentRange0to30A0to60A

MaximumPower175W350W

Table1.1Models

Introduction12

1.2Contents

Pleaseinspecttheinstrumentmechanicallyandelectricallyuponreceivingit.Unpackallitemsfromthe

shippingcarton,andcheckforanyobvioussignsofphysicaldamagethatmayhaveoccurredduring

transportation.Reportanydamagetotheshippingagentimmediately.Savetheoriginalpackingcarton

forpossiblefuturereshipment.EveryDCLoadisshippedwiththefollowingcontents:

1.1x8550or8551

2.1xACPowerCord

3.1xCerticateofCalibration

4.1xTestReport

Ensurethepresenceofalltheitemsabove. ContactthedistributororB&K

Precisionifanythingismissing.

1.3Features

•CC,CV,CRandCWoperationmodes.

•Advancedlistmodeprogramming

•TransientMode

•CR-LED:SimulatethetestfunctionthattheloadisLED.

•BatteryMode:Providebatterydischargetest,supportCC,CRandCPmodes.

•Timetest:Providetimemeasurementinbasicmode.

•Over-currenttest(OCPT):Provideover-currentprotectionfunctiontest.

•Overvoltagetest(OVPT):Provideovervoltageprotectionfunctiontest.

•OverpowerTest(OPPT):Provideoverpowerprotectionfunctiontest.

•Overvoltageprotection(OVP),overcurrent(OCP),overtemperature(OTP),andincludesakey-lock

function

•LabVIEWdriversprovided

1.4Dimensions

Model85508551

Introduction13

Dimensions

8.4”x3.5”x15.4”(213x88x390mm)

(WxHxD)

Weight6.61lb. (3kg)10.58lb. (4.8kg)

Table1.2DimensionsandWeight

Figure1.2Dimensions

Dimensionsapplywhenfrontandrearbezelsareremoved.

Introduction14

Figure1.3FrontPanel

ItemNameDescription

1PowerButtonTogglestheinstrumentONorOFF.

2FunctionKeysSeesection3.1fordetails.

3USBHostPortUSBportusedtoconnectashdrives.

4DisplayVisualpresentationofthedevicefunctionandmeasurements.

5NavigationUsedtonavigatemenusorcongureparameters.

6NumericKeypadUsedtoenterprecisevalues.(includes±andEnterkeys)

7InputPowerButtonTogglestheinputONorOFF.

8TriggerButtonTriggerbuttonforspecicfunctions.

9Input/Sense

Inputchannelsupportingsheathedbananaplugsandspadelugtype

connector.

10SoftkeysUsedtoinvokeanyfunctionsdisplayedabovethem.

Table1.3FrontPanel

1.5FrontPanel

Introduction15

1.6RearPanel

Figure1.4RearPanel

Introduction16

ItemNameDescription

1InputVoltageSwitchSwitchbetween110/220V±10%ACinput.

2ACpowerinputHousestheIEC320connector.

3CurrentMonitoring

4RS232Interface

5HandlerInstrumentinterfacesignalinputandoutputport.

6FuseHousingHousesthefuse.

Connectanexternalvoltmeteroroscilloscopetodisplaytheinput’s

current.

ConnectacablewithatwoCOMinterface(DB9)toremotelycontrol

theunit.

Table1.4RearPanel

GettingStarted

2.1PreliminaryInformation17

2.2InputPowerandFuseRequirements18

2.3FuseReplacement19

2.1PreliminaryInformation

Beforegettingstarted,pleaseinspecttheinstrumentmechanicallyandelectricallyuponreceivingit.

Unpackallitemsfromtheshippingcarton,andcheckforanyobvioussignsofphysicaldamagethatmay

haveoccurredduringtransportation.Reportanydamagetotheshippingagentimmediately.

Savetheoriginalpackingcartonforpossiblefuturereshipment.

ReviewSafetyInformation

ThisinstrumentisaClass1safetyinstrument,whichmeansithasaprotectiveearthterminal.That

terminalmustbeconnectedtoearthgroundthroughapowersourceequippedwithagroundreceptacle.

Refertothe

installationoroperation,checktheDCloadandreviewthisguideforsafetywarningsandinstructions.

Safetywarningsforspecicproceduresarelocatedatappropriateplacesthroughoutthismanual.

SafetySummarypageatthebeginningofthisguideforgeneralsafetyinformation.Before

ObserveEnvironmentalConditions

TheenvironmentalconditionsoftheDCloadaredocumentedunderEnvironmentalConditions.The

unitshouldonlybeoperatedindoorsinacontrolledenvironment.

Normalworkingtemperature: 0∘Cto40∘Cand20%to90%relativehumidity

Referenceworkingtemperature: 20∘C±8∘Cand80%relativehumidity

ThedimensionsofyourinstrumentaswellasanoutlinediagramarealsodocumentedunderSpecications.

Afancoolstheloadbydrawingairthroughthesidesandexhaustingitoutthesideandback.The

instrumentmustbeinstalledinalocationthatallowssucientspaceatthesidesandbackoftheunitfor

adequateaircirculation.

Donotoperatetheinstrumentinthepresenceofammablegasesor

fumes.

GettingStarted18

SafetyRequirements

Underthereferencedworkingcondition:

•Theinsulationresistancebetweenthepowerterminalandtheshellmustnotbelessthan50M.

•Duringtransportationtheinsulationresistancebetweenthepowerterminalandthehousingmustnot

belessthan2M.

•TheACvoltagebetweenthepowerterminalandthehousingcanwithstand1.5kVat50Hzfor1

minutewithoutbreakdownorarcing.

•Leakagecurrentwillnotexceed3.5mA.

2.2InputPowerandFuseRequirements

TheACinputonthebackofyourunitacceptsnominallinevoltagesintherangeof100(1±10%)OR

240(1±10%)VAC.Thefrequencycanbe50/60Hz.EnsuretheInputVoltageSwitchlocatedonthe

rearpanelisincorrespondingpositiontomatchthelinevoltage.

FIREHAZARDUseonlythepowercordthatwassuppliedwith

yourinstrument. Usingothertypesofpowercordsmaycause

overheatingofthepowercord,resultinginre.

SHOCKHAZARDThepowercordprovidesachassisgroundthrough

athirdconductor.Becertainthatyourpoweroutletisofthethree-

conductortypewiththecorrectpinconnectedtoearthground.

BeforeconnectingthepowercordtotheIEC320connectorontherearpaneloftheunit,besurethat

thepowerswitchisintheOFFpositionandverifythattheACpowercord,includingtheextensionline,

iscompatiblewiththeratedvoltage/currentandthatthereissucientcircuitcapacityfortheDCload.

Onceveried,connectthecablermly.

2.3FuseReplacement

ThefuseisaccessiblethroughtherearpanelbeneaththeInputVoltageSwitch.

Table2.1showsthefuserequirements.

RatingFuseSpecication

110V/60HzT2AL

220V/50HzT1AL

Table2.1FuseSpecication

Nopowershouldbeappliedtotheinstrumentwhilereplacingthe

fuse.Disconnectallcablesconnectedtotheinstrumentbefore

proceeding.

GettingStarted19

FuseReplacementProcedure

Step1.LocatethefuseboxintherearpanelbeneaththeInputVoltageSwitch.(Seegure1.4)

Step2.Insertasmallatheadscrewdriverintotheslitandrotateitcounterclockwiseasillustratedin

gure2.1.

Step3.Checkthefusetodetermineifitmustbereplaced.

Figure2.1FuseRemoval

BasicFrontPanelOperation

3.1FunctionKeys21

3.1.1ModeKey21

3.1.2SystemKey22

3.1.3ShortKey22

3.1.4Lock/LocalKey&Screenshots23

3.2Softkeys23

Atpower-on,theinstrumentwillautomaticallyentertheStaticsubmenuwherethecoreoperationmodes

(CC,CV,CR,andCW)canbeselected.

BasicFrontPanelOperation21

3.1FunctionKeys

TheFunctionKeysconsistofMode,System,Short,andLock/Local.

3.1.1ModeKey

TheModeKeyenterstheOperationModesmenus.(Figure3.1)

The8550Seriessupportsthefollowingmodes:

Menu1/3

•Static

•Trans

•List

•CR-LED

•Battery

Menu1/3Menu2/3

Menu2/3

TimeTest

•

•OCPT

•OVPT

•OPPT

•LoadReg

Menu3/3

•Sweep

•Auto

Menu3/3

Figure3.1OperationModeMenus

BasicFrontPanelOperation22

3.1.2SystemKey

PressingtheSystemKeyentersthesystemmenuwheretheinstrument’ssettingscanbecongured.

ThefollowingsubmenuscanbefoundintheSystemmenu:

•SystemCong

•Von/Vo

•Protect

•FileStore

•CommSetup

•Limit

Figure3.2SystemMenu

Formoredetailsoneachsubmenuclickonthecorrespondingsubmenu.

3.1.3ShortKey

The8550Seriescansimulateashort-circuitattheinput. Thisallowsforashort-circuitloadtestupto

themaximumcurrentrangeoftheload.

PressingtheShortkeywillenabletheshortcircuittestfunctionbyshortingtheinputterminals.Theshort

circuittestfunctionisnotavailableinCCandCR.

InCCandCRmodetheinputsettingstakeprecedenceovertheshorttest.

WhenshortcircuittestfunctionisenabledboththeLEDscorrespondingtotheShortandONkeyswill

lightup(brightblue).

Theinputon/oandtheinputprotectionfunctionstakeprecedenceoveraninput

short.

BasicFrontPanelOperation23

3.1.4Lock/LocalKey&Screenshots

TheLock/Localkeytogglestheinstrumentbetweenremote(lock)andlocalmode.Whileinremote

modeallfrontpanelkeysexceptforLock/LocalandEnterareunavailableandtheLEDcorresponding

totheLock/Localkeyisilluminated.Enterwillfunctionasascreenshotkeywhileinremotemode.

TounlockthefrontpanelpresstheLock/Local.

Screenshots

Screenshotscanbetakenwhiletheinstrumentisinremotemode.

Totakeascreenshot:

Step1.InsertaUdiskintotheUSBinterfacelocatedinthefrontpanel.

Step2.IfinlocalmodepresstheLock/Localkeytoenterremotemode.

Step3.WhileinremotemodepresstheEnterkey.

Asaveprogressindicatorwillappearinthecentertopportionofthedisplay.(

Figure3.3ScreenshotIndicator

Figure3.3)

3.2Softkeys

Thereare6softkeyslocatedbeneaththeinstrumentsdisplay.Eachkeyselectsthecorresponding

functionlocateddirectlyaboveit.Functionwillvarydependingontheselectedmenu.

Figure3.4Softkeys

Todistinguishbetweeneachsoftkeythemanualwillreferencetheassignedname

showninFigure3.4.TheF<#>isnotactuallyprintedontothesoftkeys.

Modes

The8550seriesintegratesthefollowingmodes:

4.1StaticMode25

4.1.1ConstantCurrent26

4.1.2ConstantVoltage27

4.1.3ConstantResistance28

4.1.4ConstantPower29

4.2TransientMode30

4.2.1Continuous30

4.2.2Pulse31

4.2.3Toggle31

4.3ListMode32

4.3.1ContinuousListOperation32

4.3.2CountListOperation32

4.3.3StepListOperation33

4.3.4FileConguration34

4.4CR-LEDMode35

4.5BatteryTestFunction36

4.6TimeTest38

4.7Over-CurrentProtectionTest(OCPT)39

4.8Over-VoltageProtectionTest(OVPT)41

4.9Over-PowerProtectionTest(OPPT)42

4.10LoadRegulationMode43

4.11SweepMode44

4.12AutomaticTestMode45

Toaccessthesemodes:

Step1.PresstheModekeytoentertheModemenu.

Step2.Pressthesoftkeycorrespondingtothedesiredmode.

Modes25

4.1StaticMode

StaticmodeincludesthemainfourfunctionsoftheDCload;constantcurrent(CC),constantcurrent(CC),

constantresistance(CR),andconstantpower(CW).OnceinStaticmode,selectthedesiredfunction

bypressingthecorrespondingsoftkey.TheparametersintheLoadSettingstabwillchangeaccordingly

totheselectedoperatingmode.

Figure4.1StaticMode

Whenprogrammedtoamode,theelectronicloadremainsinthatmodeuntilanothermodeisselected

orthemenuisswitch.Therefore,whennavigatingothermenussuchasSystemthepreviouslyselected

modewillnotbeavailable.

Iftheselectedmodeisinoperationitmustrstbedisabledinordertonavigate

anymenuoutofStaticmode.Likewise,thefunctioncanonlybeginoperation

whentheinstrumentisinStaticmode.

Modes26

4.1.1ConstantCurrent

Inconstantcurrentmode,theloadwillsinkacurrentinaccordancewiththeprogrammedvalueregardless

oftheinputvoltage.

Figure4.2CCMode

CongureCCParameters

ThereareseveralparametersthatmustbesetupproperlytooperatinginCCmode.Theseparameters

areaccessibleonceCCisselected.Userotaryknobtonavigatetheavailableparameters.

I-Set

Setsthecurrentvaluetheloadwillsink.Tosetthevalueusethenumerickeys,thenpressEntertoenter

thevalue.Theknobcanalsobeusedtoadjustthevalue.

SlewRiseA/μs

Setstheriseslewrateoftheload,whichdeterminestherateatwhichtheinputcurrentincreasestoa

newprogrammedvalue.

SlewFallA/μs

Setsthefallslewrateoftheload,whichdeterminestherateatwhichtheinputcurrentdecreasestoa

newprogrammedvalue.

Modes27

4.1.2ConstantVoltage

InconstantvoltagemodetheloadwillsinkenoughcurrenttocontroltheDUTvoltagetotheprogrammed

value.TheloadactsasashuntvoltageregulatorwhenoperatinginCVmode.

Figure4.3CVMode

CongureCVParameters

ThereareseveralparametersthatmustbesetupproperlytooperatinginCVmode.Theseparameters

areaccessibleonceCVisselected.Userotaryknobtonavigatetheavailableparameters.

V-Set

Setsthevoltagevaluetheloadwillmaintain.Tosetthevalueusethenumerickeys,thenpressEnterto

enterthevalue.Theknobcanalsobeusedtoadjustthevalue.

SlewRiseV/ms

Setstheriseslewrateoftheload,whichdeterminestherateatwhichtheinputvoltageincreasestoa

newprogrammedvalue.

Modes28

4.1.3ConstantResistance

Inconstantresistancemodetheloadwillsinkacurrentlinearlyproportionaltothevoltageinaccordance

withtheprogrammedresistancevalue.

Figure4.4CRMode

CongureCWParameters

ThereareseveralparametersthatmustbesetupproperlytooperatinginCVmode.Theseparameters

areaccessibleonceCRisselected.Userotaryknobtonavigatetheavailableparameters.

R-Set

Setstheresistancevaluetheloadwillmaintain.Tosetthevalueusethenumerickeys,thenpressEnter

toenterthevalue.Theknobcanalsobeusedtoadjustthevalue.

Modes29

4.1.4ConstantPower

Inconstantpowermodetheloadwillmaintaintheinputpoweratthespeciedprogrammedpowerlevel.

Theloadhasanindependentpowerloopthatregulatestheinputpoweratthe

limitsetting(175formodel8550and350formodel8551).

Figure4.5CWMode

CongureCWParameters

ThereareseveralparametersthatmustbesetupproperlytooperatinginCVmode.Theseparameters

areaccessibleonceCWisselected.Userotaryknobtonavigatetheavailableparameters.

P-Set

Setsthewattagevaluetheloadwillmaintain. Tosetthevalueusethenumerickeys,thenpressEnter

toenterthevalue.Theknobcanalsobeusedtoadjustthevalue.

Modes30

4.2TransientMode

Transientoperationenablesthemoduletoperiodicallyswitchbetweentwoloadlevels.Thisfunction

allowsfordynamiccharacteristicsofpowersuppliesorotherDCsources.

Transienttestingcanbeusedtocheckthestabilityofthesourcevoltage.Transientfunctionshavetwo

currentlevelsdenotedasLevel-AandLevel-B,whichmustbeinthesamerange6Aor60A.Youcan

setthefrequencyaswellasthedutycycle,whichwillaectthetimingandwidthofeachlevel.Theslew

ratedeterminestherateatwhichthelevelchanges.

Therearethreedierenttransienttestingmodes:continuous,pulse,andtoggle.

4.2.1Continuous

Generatesarespectivepulsestreamthattogglesbetweentwoloadlevels.Uponreceivingatrigger,

andtheloadwillcontinuouslyswitchbetweentheA/Blevelspreset.Transientloadsareusuallyusedto

testthepowersupply’sperformanceundercontinuouschangingloadconditions.

currentwaveformofcontinuoustransientoperationmode.

Figure4.6showsthe

Figure4.6ContinuousTransientOperation

Modes31

4.2.2Pulse

Generatesatransientpulseofprogrammablewidthwhenpulsetransientoperationisineect.

InpulsemodetheelectronicloadwillautomaticallyswitchtoBlevel.AftermaintainingBwidthtime,it

willswitchtoAlevel.TheelectronicloadwillnotswitchtoBlevelagainuntiltheinstrumentreceivesa

triggersignal.

Figure4.7showsthecurrentwaveforminpulsetransientoperation.

Figure4.7PulseTransientOperation

4.2.3Toggle

Intogglemode,,theelectronicloadwillswitchbetweenLevel-AandLevel-Bwhenitreceivesatrigger

signal.

Figure4.8showsthecurrentwaveformintoggletransientoperation.

Figure4.8ToggleTransientOperation

Modes32

4.3ListMode

Listmodeallowstheusertogeneratecomplexsequencesofinputchangeswithrapid,precisetiming.

Thisisusefulwhenrunningtestsequenceswithaminimumamountofprogrammingoverhead.

Liststepsarecontinuouslyloadedaccordingtothesequenceeditedinthelistle. Theloadsupports

upto10les,eachcontainingupto100steps.Eachstepcancongurethecurrentvalue,duration,and

slope.

Filescannotbesequencedtorunoneaftertheother. Toswitchbetweenlesthe

inputmustberstbedisabledthentheselectedlecanbecongured.

Listmodesupports3congurations:Continuous,Count,andStep.

4.3.1ContinuousListOperation

Whenlistissettocontinuousthelistwillrepeatallconguredstepsoftheselectedlecontinuouslyuntil

theinputisdisabled.

TheCountparameterdoesnotaecttherepeatcyclesincontinuousmode.

4.3.2CountListOperation

WhenlistissettocounttheselectedlistwillberepeatedbythespeciednumberofCount.Countcan

becongureupto100.Oncethelisthasbeenrepeatedthespeciednumberoftimestheinputwill

automaticallybedisabled.

to2,meaningthelerepeatstwicebeforetheinputisdisabled.

Figure4.9showsanexampleofaFilecontaining8steps.Thecountwasset

Figure4.9CountListOperation

Modes33

4.3.3StepListOperation

Whenlistissettostepthenextstepwillnotloadautomatically.Oncethedwelltimeofthestepelapsesthe

instrumentwillremaininthatstepuntilatriggersignalisreceived.Triggeringafterthelastprogrammed

stepinthelehaselapsedwillloopthelebacktostep1.Theusercanloopthroughtheleinnitely

regardlessofthespeciedcountvalue.

Figure4.10StepListOperation

4.3.4FileConguration

PressingMode>F3>F1willdisplaytheListEditmenugure4.11.

Modes34

Figure4.11FileConguration

IntheListEditmenutheusercan;insert,add,copy,paste,delete,andeditsteps. Eachstephas3

congurableparameters:Current,Dwell,andslew.

SettingDescription

Current(A)Setsthecurrentvaluetheloadwillsink.

Dwell(s)Setsthedwelltimeoftheselectedstep. (20μ/sto50)

Slew(μ/s)Setstherateatwhichthecurrentchangesfromonesteptothenext.

Table4.1StepParameters

4.4CR-LEDMode

ToenterCR-LEDmodepressMode>F4.

Figure4.12CR-LEDMenu

Modes35

CRLEDallowstheinstrumenttosimulatetheloadingbehavioroftypicalLEDs,whichcanbeused

fortestingLEDdrivers. Whenthefunctionisenabled,theloadallowstheusertoconguretheLED’s

operatingresistanceandforwardvoltagealongwiththevoltagerange(sameasCRoperation).

illustratestheV-IcharacteristicscurveofatypicalLED.

Figure4.13

Figure4.13CR-LEDMode

Modes36

•Vd=ForwardvoltageoftheLED

•Rd=TheLED’soperatingresistance

•Vo=OperatingvoltageacrosstheLED

•Io=OperatingcurrentacrosstheLED

•RdCoe=Theratiooftheseriesequivalentresistance(Rd)andthetotalequivalentresistanceof

theLEDload(Vo/Io)RdCoe=Rd/(Vo/Io)

TheuseCR-LEDmodeonlyVo,Io,andRdCoehavetobeentered.

4.5BatteryTestFunction

The8550serieshasabuilt-inbatterytestfunctionthatsupports:CC,CR,andCWmode.

Figure4.14BatteryMode

Eachmodesupportsthefollowingstopconditions:

ConditionDescription

Voltage(V)Setsacut-ovoltagelevel.Whenthislevelisreached,thetestwillend.

Time(msors)Setsatimer.Whenthespeciedtimeisreached,thetestwillend.

Energy(Ah)

Energy(Wh)

Setsacapacitylevel.WhenthecalculatedAhcapacityreachesthislevel,this

testwillend.

Setsacapacitylevel.WhenthecalculatedWhcapacityreachesthislevel,this

testwillend.

Table4.2StopConditions

Modes37

Duringoperation,theloadoperatesatthespeciedlevelaccordingtotheselectedoperationmode,while

measuringandupdatingthecapacityvalueinbothamp-hours(Ah)andwatt-hour(Wh). Theloadwill

alsotrackthetest’sruntime.Whentheselectedstopconditionmeetsthespeciedlevelthetestwillend.

Tosetupthebatterytestfunction:

Step1.EnterBatteryTestmodebypressingModethenF5.

Step2.Selectthedesiredoperationmodebypressingthecorrespondingsoftkey.

Step3.Setoperationmodelevel.

Step4.Selectastopcondition.

Step5.Setthestopconditionlevel.

Step6.Verifytheproperrangesrequiredforyourtestareselected.

4.6TimeTest

The8550seriesprovidesatimetestfunctionwithatestaccuracyof.1ms(100μs).

ToentertheTimeTestoperationmodepressMode>F6>F1.

Modes38

Figure4.15TimeTestMode

Theloadismeasuredaccordingtothepredeterminedloadingconditions,andthetimeintervaliscalculated

accordingtothestartandstopconditionvalues.Thestartconditionwillstartthecounteronceinput

reachesthesetvalueoftheselectedstartcondition.Thetimerwillbestoppedoncetheinputmeetsthe

setvalueoftheselectedstopcondition.

Tosetupatimetest:

Step1.EnterTimeTestmodebypressingMode>F6>F1.

Step2.Selectthedesiredoperationmodebypressingthecorrespondingsoftkey.

•Setoperationmodelevel.

Step3.Selectastartcondition.(Voltage,Current,Trigger)

•Setthestartconditionlevel.

•Settheendedge.(RiseorFall)

Step4.Selectthestopcondition.(Voltage,Current,Trigger)

•Setthestopconditionlevel.

•Settheendedge.(RiseorFall)

Step5.Verifytheproperrangesrequiredforyourtestareselected.

Modes39

4.7Over-CurrentProtectionTest(OCPT)

The8550seriesprovidestheover-currentprotectiontestfunction.Theprincipleisshowningure4.16.

Figure4.16OCPTOperation

Theloadstartsfromtheinitialcurrent(I-Start)andgraduallyincreasesthecurrenttothecut-ocurrent

(I-End)accordingtothesetnumberofsteps(Steps). Whenitdetectsthattheinputleveldropstothe

triggerlevel(V-Trig),itisconsideredthatthesourceundertesthasachievedOCPprotection.

Figure4.17OCPTMode

Modes40

Asshowin

capturesthepowerofthemaximumpowerpoint,Voltageandcurrentvalues.

ParametersDescription

gure4.17,duringthisprocess,theloadnotonlydetectstheOCPprotectionpoint,butalso

I-StartSetsastartcurrentlevel.Theloadwillsinkthiscurrentwhenthetestisinitiated.

I-End

StepsSetthetotalnumberofincreasingsteps. (1to1000)

DwellSetsthedwelltimeofeachstep.

V-TrigSetsthevoltagelevelthattriggersover-currentprotection.

Latch

Setsastopcurrentlevel. Whenthespeciedcurrentisreached,thetestwill

end.

Setsthestatusoftheloadoncethetestiscomplete.

ON:Continuetoloadafterthetestiscompleted.

OFF:Disableloadafterthetestiscompleted.

Table4.3OCPTTestParameters

Modes41

4.8Over-VoltageProtectionTest(OVPT)

The8550seriesprovidestheover-voltageprotectiontestfunction.Theprincipleisshowningure4.18.

Figure4.18OVPTOperation

Theloadcapturesthepeakpointandthefallingedgeoftheinputvoltage.Oncethefallingedgereaches

thesetV-TrigvaluethetimerisstoppedandtheresponsetimeissavedasTovp.

OVPTcanbeusedtotestthetimerequiredfortheoutputoftheDUTtosettlefromtheoutputpeakto

thedesiredvoltage.

ParameterDescription

OVP(V)

V-trig(V)Setsthevoltagelevelatwhichthetimerisstopped.

Tovp(ms)

Theload’sover-voltageprotectionvaluesetinSystem>Protection. Triggers

thestartofthecounter.

Calculatedtimefortheoutputtosettlefromthepeakvoltagetodesiredvoltage

value.

Table4.4OVPTParameters

Modes42

4.9Over-PowerProtectionTest(OPPT)

The8550seriesprovidestheover-powerprotectiontestfunction.Theprincipleisshowningure4.19.

Figure4.19OPPTOperation

Theloadstartsfromtheinitialpower(P-Start)andgraduallyincreasesthepowertothecut-opower

(P-End)accordingtothesetnumberofsteps(Steps).Whentheloaddetectsthattheinputleveldrops

tothetriggerlevel(V-Trig),itisconsideredthatthesourceundertesthasachievedOPPprotection.

Duringthisprocess,theloadnotonlydetectstheOPPprotectionpoint,butalsocaptures:Pmax_power,

Pmax_voltageandPmax_currentvalues.

ParametersDescription

P-StartThevaluetheloadwillsinkthispowerwhenthetestisinitiated.

P-EndWhenthespeciedpowerisreached,thetestwillend.

StepsSetthetotalnumberofincreasingsteps. (1to1000)

DwellSetsthedwelltimeofeachstep.

V-TrigSetsthevoltagelevelthattriggersover-voltageprotection.

Table4.5OPPTTestParameters

Modes43

4.10LoadRegulationMode

The8550seriesprovidestheloadregulationfunction. Duringthetest,theloadwillbeloadedunder3

dierentloadcurrents,theminimumcurrent(I-Min),thenormalcurrent(I-Normal)andthemaximum

current(I-Max).

Eachloadvaluewillbetestedforapresettime(Delay).Thevoltagevalueunderdierentloadsis

recorded,andnallythenegativeΔV,loadregulation(Regulation)andpowersupplyinternalresistance

(Rs)iscalculatedaccordingtothefollowingenumeratedformulas.

Δ𝑉=𝑉

𝑅𝑠=Δ𝑉

𝐼

𝑚𝑎𝑥−𝐼𝑚𝑖𝑛

𝑚𝑎𝑥

−𝑉

𝑅𝑒𝑔𝑢𝑙𝑎𝑡𝑖𝑜𝑛=Δ

𝑉

𝑛𝑜𝑟𝑚𝑎𝑙

𝑚𝑖𝑛

Figure4.20LoadRegulationMenu

ParametersDescription

I-MinSetsthelowlevelloadcurrent.

I-MaxSetsthehighlevelloadcurrent.

I-NormalSetthenormalworkingcurrent.

DelaySetsthedwelltimeofeachloadcurrent.

Table4.6OPPTTestParameters

Modes44

4.11SweepMode

SweepmodecanbeusedtocapturestheVp+andVp-ofthepowersupplywhentestedforworstcase

scenario.Theloadisswitchedrepeatedlybetweentwocurrentloadsaccordingtothepresetcurrent

slope.Thedurationofeachcurrentlevelwillbedeterminedbythescanfrequencyanddutyratio(Duty).

Thesweepfrequencywillgraduallyincreaseordecreasefromthestartfrequency(Fstart).Thefrequency

willchangeaccordingtothenumberofstepfrequency(Fstep)set,untilthecutofrequency(Fend)is

reached.Thedurationofeachfrequencystepispresetbythe(Dwell)time.

Duringthescanningprocess,theinputvoltagewillbeaccompaniedbythetransientofthecurrent,

resultinginovershootanddrop.Theloadwilldisplaythemaximumvalue(Vp+),theminimumvalue

(Vp-),andthefrequencyofoccurrenceoftheovershootinrealtime.

ParametersDescription

I-MinSetsthehighcurrentvaluetosink.

I-MaxSetsthelowcurrentvaluetosink.

SlewRiseSetsthetimerequiredtodecreasecurrentfromonespeciedvaluetothenext.

SlewFallSetsthetimerequiredtoincreasecurrentfromonespeciedvaluetothenext.

FstartSetsthefrequencyvalueatwhichthesweepbegins.

FendSetsthefrequencyvalueatwhichthesweepends.

DwellSetsthedwelltimeofeachfrequencystep.

DutySetstheratioofthehighcurrenttothetotaltime.

Table4.7SweepParameters

Modes45

4.12AutomaticTestMode

Theautomatictestfunctionisusedtoinspectiontheproductionline.Theloadedrunsasequence

accordingtothestepseditedintheselectedle. Thepassorfailisautomaticallydeterminedbased

onthepresetconditionvalues.

Theloadsupportsupto10les,eachlesupportsupto50stepsoftesting,andeachstepcansetthe

loadingconditionsandlimitjudgment.

Tocongureanautomatictest:

Step1.PressMode>F6>F6>F2toenterAutomode.

Step2.Setthemainparametersoftheautomatictest.

•Selectthedesiredlist(1-10).

•Setthecountnumber.Numberoftimesthelewillrunbeforethestepiselapses.

•Setthetriggermode.

Step3.OncethemainparametersaresetcongurethelestepsbypressingtheEditsoftkey(F1when

Fileisselected).

Step4.Selectthesteptobeedited,thenpresstheDatasoftkey(F2).

Step5.Ineachsteptherstparametertobeeditedshouldbethemode.

Figure4.21EditList

•CC,CV,CR,andCWareavailable.

•Uponselectingthemode,DataandConditioncanbeset.

•Theparametersforeachmodevaries.Pleasereviewthesectioncorrespondingtoeach

modeformoreinformation.

Step6.Congurethetestconditions.

•SettheLimittype.

•SetthelimitvaluesUpperandLowerlimit.

•SettheFailOperationaction.(Abortthetestorcontinue)

•SettheDelaytype.

–Ifdelaytypewassettotimesetthedelaytime.

Step7.Afterconguringallsettings,presstheONkeytostarttheautomatictest.

Modes46

Figure4.22AutoTestRun

WhilethesequenceisrunningtheStepwillbecurrentlyrunningalongwiththe

modeofthatstatewillbedisplayed. Uponcompletionofthesequence,the

numberofthefailedstepswillbedisplayed.

System

Thefollowinginstrument’sparameterscanbeconguredfromthesystemmenu:

5.1SystemConguration48

5.1.1Language48

5.1.2BeepSound48

5.1.3Sense48

5.1.4Power-On48

5.1.5Display49

5.1.6Source50

5.1.7ExternalProgramming50

5.2Von/Vo50

5.3Protect51

5.3.1Over-VoltageProtection51

5.3.2Over-CurrentProtection51

5.3.3Over-PowerProtection51

5.3.4Delay51

5.4FileStore52

5.5CommunicationSetup53

5.6Limit54

ToentertheSystemmenupresstheSystemkey.

Figure5.1SystemMenu

System48

5.1SystemConguration

AllsetupproceduresandsettingsexplainedinthissectioncanbeaccessedfromtheSystemConguration

menu.Toaccessthismenu,pressSystem>F1.

5.1.1Language

The8550seriessupportEnglishandChinese.Englishisthedefaultlanguage.

5.1.2BeepSound

Enable/Disablethekeysound.

Disablingthekeysounddoesnotaecttheprotectionbuzzer.

5.1.3Sense

Enable/Disableremotesense.

Remotesensecanbeusedtocompensateforvoltagedrops(upto1V)duetoresistancefromtest

leads. Thecurrentwillproduceavoltagedropontheconnectionline. Thelongertheconnectionline,

thegreatertheresistanceoftheconnectionline,orthegreaterthecurrent,thegreaterthevoltagedrop

willbe.Toreducetheerrorcausedbythevoltagemeasurement,theloadprovidesremotecompensation

function,asshownbelow.

Inadditiontothe[]inputoftheloadconnectedtothepowersupply,anadditionaltwowiresarerequired

toconnectthepowersupply.

5.1.4Power-On

CongurestheinitialPower-OnstateoftheloadbetweenDefaultorFile.Thesettingsaectedinclude

allinputandsystemsettings.

Default:Thefactorydefaultsettingswillbeloadedatpoweron.

File:Loadsthesavedsettingsinthespeciedleatpoweron. Toselecttheletobeloadedreferto

section5.4.

System49

5.1.5Display

Duringtheoperationoftheload,theusercanchoosetodisplaycertainparametersorblocksome

parametersinthedatasamplingdisplayarea.

U,I,P,PPon

U,I,P,PPo

Figure5.2U,I,P,PPon

Figure5.3U,I,P,PPo

U,I,P,R

System50

Figure5.4U,I,P,R

5.1.6Source

SettheoutputtypeoftheDUTinadvance.ThisiscrucialforCR,CPandothermodes.

CC:TheDUTisaconstantcurrentsource.

CV:TheDUTisaconstantvoltagesource.

5.1.7ExternalProgramming

Enable/Disabletheexternalanalogprogramming.

Port5intheHandlerinterfaceontherearpaneloftheinstrumentistheEXT-PROGport,whichisused

forexternalanaloginput. Connectthisportto0-10Vvoltagetosimulatetheinputfrom0tofullscale,

thusadjusttheinputvoltageandcurrentvalueoftheload.Formoreinformationaboutthehandlerrefer

section6.

to

5.2Von/Vo

TheVon/VosettingcongurestheCCmodepull-downandunloadvoltage.

PullVoltage:Uponenablingtheinputiftheinputvoltageislowerthanthisvalue,theON/OFFbutton

lightashesandnocurrentissunkuntiltheinputvoltageexceedsthisvalue.Whentheinputvoltageis

greaterthanthisvalue,theON/OFFbuttonlightisalwaysonandtheloadbeginstosinkcurrent.

UnloadingVoltage:Whentheloadisociallyloaded,iftheinputvoltagevalueislowerthanthisvalue,

theinstrumentisturnedoandtheloadstopssinkingcurrent.

System51

5.3Protect

Theelectronicloadhasthefollowingprotectionfunctions: Overvoltageprotection(OVP),overcurrent

protection(OCP),andoverpowerprotection(OPP).

Theinstrumentwillactappropriatelyonceanyoftheaboveprotectionsareactive.Youcanpresstheenter

buttononthefrontpaneltorestoretheprotectionfunction. Forexample,iftheelectronicloadtriggers

theovervoltageprotection,thebuzzerwillalarm,theinputwillautomaticallyturno,andanotication

indicatingovervoltwillbedisplayed.

Eachprotectionvaluecanbesettodefaultoruser.

Defaultvalue:Astherangeisswitched,theprotectionvalueisautomaticallyadjustedto1.05timesthe

currentrangevalue.

Uservalue:Accordingtouserneeds,thevaluecanbesetnottoexceedthemaximumrange

5.3.1Over-VoltageProtection

Setsavoltageprotectionvalue.Thevaluecanbesetfrom0upto105%ofthemaximumvoltagerange.

WhenOVPistriggeredtheinputwillbedisabled,thebuzzerwillnotifytheuser,andfunctionofthe

instrumentwillnotbeavailableuntiltheuserpressestheEnterkey.

5.3.2Over-CurrentProtection

Setsacurrentprotectionvalue.Thevaluecanbesetfrom0upto105%ofthemaximumcurrentrange.

WhenOCPistriggeredtheinputwillbedisabled,thebuzzerwillnotifytheuser,andfunctionofthe

instrumentwillnotbeavailableuntiltheuserpressestheEnterkey.

5.3.3Over-PowerProtection

Setsapowerprotectionvalue.Thevaluecanbesetfrom0upto105%ofthemaximumpowerrange.

WhenOPPistriggeredtheinputwillbedisabled,thebuzzerwillnotifytheuser,andfunctionofthe

instrumentwillnotbeavailableuntiltheuserpressestheEnterkey.

5.3.4Delay

Setsthedelaytimebetweentheloadtriggeringprotectionandtheinputbeingdisabled.Thishelps

preventaccidentalpulsesfromtriggeringtheloadprotection.Iftheloadprotectionisstilltriggeredafter

thedelaytimeexpires,theloadisstopped.

System52

5.4FileStore

Theinstrumentcansavethecurrentparametersettingsandcongurationoftheloadinash.

Tosavethecurrentparameters:

Step1.PressSystem>F4toentertheFileStoremenu.

Step2.Selectinwhatmemorythelewillbesaved.InternalFile(F1)orExternalFile(F2)

Step3.PresstheF6softkeytoentereditmode.

Step4.IneditmodeselecttheFilenumbertobemodied.

•Iftheselectedlehasnodatasaved,pressF1tosavethecurrentparameterstothespecied

le.(Alenamewillhavetobeassignedusingthenumberpad.)

•Iftheselectedlealreadyhasdatasavedthelecanbeassignedastheloadle,ifitis

alreadytheloadleitcanberemovedastheloadle.Thelecanalsobecopiedtoanother

lenumberordeleted.

Step5.Theselectedloadlewillhaveacheckmarktotherightofthelename.

Figure5.5

Power-Onmustbesettousertoloadtheselectedleatpoweron.

5.5CommunicationSetup

The8550seriessupportsremotecommunicationovertheRS232interface.

TheparametersoftheinterfacecanbeconguredintheCommunicationSetupmenu.

Thefollowingparametersaresupported.

Baudrate:4800,9600,19200,38400,115200

Databits:5,6,7,8

Stopbits:1,2

Parity:Noparity,oddparity,evenparity,ag,space

System53

Referto

interface.

image5.6fortheRS232pinout.TheRS-232islabeledintherearpanelanditisafemaleDB-9

Figure5.6RS232Pinout

PinDescription

2TransmitsData

3ReceivesData

5GND

Table5.1

AstraightcrossoverDB9femaletoDB9maleserialcableisrequiredforusingthe

RS-232interface. DonotuseastraightDB9cable.

System54

5.6Limit

Setsthepassandfailparametersforthevoltage,current,andpowerinput.

Eachparameterconsistof3parts;Triggerstate,lowervalue,anduppervalue.Thetriggerstatedetermines

iftheinstrumentreportsafailinput.

IftriggerstatusissettoOnthebuzzerwillinformtheuserwhenevertheinputfailstomeetthespecied

loweroruppervalue.

Ifthetriggerissettootherewillnotbeanynoticationofafailinginputsignal.

Theinstrumentwillcontinuetheselectedfunctioneveniftheinputsignaltriggers

thefailstatus.

Handler

The8500seriesprovidesaHANDLERinterface. Thehandlercanbeusedtoreceiveexternaltrigger

signals,controlsignals,andoutputasignalforsortingresults.

Figure6.1HandlerPinout

PinFunctionDescription

1DGNDDigitalground(chassisground)

2ONExternalON/OFFcontrolsignal,lowpulseiseective

3TRIGExternaltriggersignal,lowpulseiseective

4AGNDAnalogground

5VF/EXT-PROGRefertosection

6PASS2Successsignal

7PASS1Successsignal

8FAIL2Failuresignal

9FAIL1Failuresignal

6.3

Table6.1

Handler56

6.1ONFunction

ThisinterfacefunctionisequivalenttothefrontpanelON/OFFkey,andthelowpulsesignaliseective.

Whenalowpulsesignalisreceived,theloadsinkscurrentandtheON/OFFbuttonLEDlightsup.When

thelowpulsesignalisreceivedagain,theloadstopssinkingcurrentandtheON/OFFbuttonLEDis

disabled.

6.2TRIG

ThetriggerfunctionisequivalenttotheTRIGkeyonthefrontpanel,andthelowpulsesignaliseective.

6.3VF/EXT-PROG

VF

Reversepolarityindicationsignal.Whenthepolarityoftheloadinputterminalisreversed,thisport

outputs

EXT-PROG

Externalanaloginput,simulatestheinputfrom0tofullscalebyconnectingthe0-10Vvoltagetothisport

toadjusttheinputvoltageandcurrentvalueoftheload.

EXT-PROintheSystemCongmenumustbeenabled.

6.4Pass/Fail

Duringtheautomatictest,thecorrespondingPassorFailsignalisoutputaccordingtotheloadtestresult.

8550 Series

5 bkprecision.com

v050323

Specifications

Model 8550 8551

Input Ratings

Input voltage 0 to 150 V 0 to 150 V

Input current

Low 0 to 3 A 0 to 6 A

High 0 to 30 A 0 to 60 A

Input power 175 W 350 W

Minimum operating

voltage

Low 0.15 V at 3 A 0.15 V at 6 A

High 1.5 V at 30 A 1.5 V at 60 A

CV Mode

Range

Low 0 to 15 V

High 0 to 150 V

Resolution

Low 0.2 mV

High 2 mV

Accuracy ±(0.05% + 0.05% FS)

CC Mode

Range

Low 0 to 3 A 0 to 6 A

High 0 to 30 A 0 to 60 A

Resolution

Low 0.05 mA 0.1 mA

High 0.5 mA 1 mA

Accuracy ±(0.05% + 0.05% FS)

CR Mode

Range 0.05 Ω to 30 kΩ 0.03 Ω to 20 kΩ

Resolution 0.1 Ω

Accuracy 1%

CW Mode

Range 0 to 175 W 0 to 350 W

Resolution 10 mW

Accuracy ±(0.5% + 0.1% FS)

Transient Mode (CC mode)

T1 & T2

(1)

100 µs to 60 s

Resolution 2 µs

Accuracy 1 µs + 100 ppm

Slew Rate

(2)

0.6 A/ms to 1.5 A/µs 1.2 A/ms to 3 A/µs

Readback Voltage

Range

Low 0 to 15 V

High 0 to 150 V

Resolution

Low 1 mV

High 10 mV

Accuracy ±(0.08% + 0.05% FS)

Readback Current

Range

Low 0 to 3 A 0 to 6 A

High 0 to 30 A 0 to 60 A

Resolution

Low 0.1 mA

High 1 mA

Accuracy ±(0.08% + 0.05% FS)

Readback Ripple

(3)

Range

Low 0 to 15 V

High 0 to 150 V

Bandwidth 250 kHz

Accuracy 0.1%

General

Protection

Over voltage protection (OVP),
Over current protection (OCP),

Over power protection (OPP), and

Remote reverse voltage (RRV)

I/O Interfaces RS232 and Handler

AC Input 110 V/220 V ±10%, 50 Hz/60 Hz ±5%

Maximum Rated Input Power < 50 VA

Temperature 32 ºF to 104 ºF (0 ºC to 40 ºC)

Humidity Indoor use, < 90% RH

Safety

EN 61010-2010+A1:2019,

Low Voltage Directive (LVD) 2014/35/EU

Electromagnetic Compatibility

EN61326-1:2021, CISPR 11,

EN61000-3-2:2019+A1:2021,

EN61000-3-3:2013+A1:2019+A2:2021,

EMC Directive 2014/30/EU

Dimensions (W x H x D) 8.4” x 3.5” x 15.4” (213 x 88 x 390 mm)

Weight 6.61 lb (3 kg) 10.58 lb (4.8 kg)

Warranty 3 Years

Standard accessories Power cord and certificate of calibration

Optional accessories TLPWRI high current test leads

Note: All specifications apply to the unit after a temperature stabilization time of 30 minutes over an ambient temperature range of 23 °C ± 5 °C.

(1) Fast pulse trains with large transitions may not be achievable.

(2) The slew rate specifications are not warranted but are descriptions of typical performance.
The actual transition time is defined as the time for the input to change from 10% to
90%, or vice versa, of the programmed current values. In case of very large load changes,
e.g. from no load to full load, the actual transition time will be larger than the expected
time. The load will automatically adjust the slew rate to fit within the range (high or low)
that is closest to the programmed value.

(3) Accuracy typical. Applies to supplementary V

pp

, Ipp, and Ppp measurements.

Ordering Information

8550 Series Programmable DC Electronic Loads

Model Description
8550 150 V / 30 A, 175 W
8551 150 V / 60 A, 350 W

ServiceInformation

WarrantyService:Pleasegotothesupportandservicesectiononourwebsiteatbkprecision.comto

obtainanRMA#. Returntheproductintheoriginalpackagingwithproofofpurchasetotheaddress

below.ClearlystateontheRMAtheperformanceproblemandreturnanyleads,probes,connectorsand

accessoriesthatyouareusingwiththedevice.

Non-WarrantyService:Pleasegotothesupportandservicesectiononourwebsiteatbkprecision.com

toobtainanRMA#.Returntheproductintheoriginalpackagingtotheaddressbelow.Clearlystateon

theRMAtheperformanceproblemandreturnanyleads,probes,connectorsandaccessoriesthatyou

areusingwiththedevice. Customersnotonanopenaccountmustincludepaymentintheformofa

moneyorderorcreditcard.Forthemostcurrentrepairchargespleaserefertotheserviceandsupport

sectiononourwebsite.

ReturnallmerchandisetoB&KPrecisionCorp.withprepaidshipping.Theat-raterepairchargefor

Non-WarrantyServicedoesnotincludereturnshipping.ReturnshippingtolocationsinNorthAmericais

includedforWarrantyService. Forovernightshipmentsandnon-NorthAmericanshippingfeesplease

contactB&KPrecisionCorp.

Includewiththereturnedinstrumentyourcompletereturnshippingaddress,contactname,phonenumber

anddescriptionofproblem.

B&KPrecisionCorp.

22820SaviRanchParkway

YorbaLinda,CA92887

bkprecision.com

714-921-9095

LIMITEDTHREE-YEARWARRANTY

B&KPrecisionCorp.warrantstotheoriginalpurchaserthatitsproductsandthecomponentpartsthereof,

willbefreefromdefectsinworkmanshipandmaterialsforaperiodofthreeyearsfromdateofpurchase.

B&KPrecisionCorp.will,withoutcharge,repairorreplace,atitsoption,defectiveproductorcomponent

parts.Returnedproductmustbeaccompaniedbyproofofthepurchasedateintheformofasales

receipt.

Tohelpusbetterserveyou,pleasecompletethewarrantyregistrationforyournewinstrumentviaour

websitewww.bkprecision.com

Exclusions:Thiswarrantydoesnotapplyintheeventofmisuseorabuseoftheproductorasa

resultofunauthorizedalterationsorrepairs.Thewarrantyisvoidiftheserialnumberisaltered,

defacedorremoved.

B&KPrecisionCorp.shallnotbeliableforanyconsequentialdamages,includingwithoutlimitation

damagesresultingfromlossofuse.Somestatesdonotallowlimitationsofincidentalorconsequential

damages.Sotheabovelimitationorexclusionmaynotapplytoyou.

Thiswarrantygivesyouspecicrightsandyoumayhaveotherrights,whichvaryfromstate-to-state.

B&KPrecisionCorp.

22820SaviRanchParkway

YorbaLinda,CA92887

www.bkprecision.com

714-921-9095

Version:June7,2023