Extech Instruments 382275 User manual

UserGuide
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Model382275and382276
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SingleOutputLaboratoryGrade
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SwitchingDCPowerSupply
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Introduction
CongratulationsonyourpurchaseoftheExtech382275(110V)or382276(220V)SingleOutput
LaboratoryGradeDCPowerSupply.

Thedualaction(coarse/finetune)rotaryencoderallowsforquickandprecisevoltageand
currentleveladjustments.Setting,changing,andcheckingthecurrentlimitlevelcanbe
performedeasilywithoutsparkingtheoutputpoles.
Theremotecontrolfeatureallowstheusertoremotelyperformthefollowingtasks:
OutputpowerON/OFF
VoltageandCurrentLevelAdjustments
Thethreeuser‐presetsfacilitatequickaccesstofrequentlyusedvoltageandcurrentsettings.
Thispowersupplyisshippedfullytestedandcalibratedand,withproperuse,willprovideyears
ofreliableservice.
Safety
WARNING
• Donotusethispowersupplywithelectricmotorsorforchargingpurposeson
electroplatingequipmentorsimilardevices.ReturnEMFandvoltagetransientsgenerated
byelectricmotorscandamagethispowersupply.Thispowersupplywasdesignedforuse
onelectronicequipmentonlyandnotintendedforuseonelectricalequipmentofany
kind.
• Donotusethispowersupplynearwater.
• Donotoperateortouchthispowersupplywithwethands.
• DonotopenthecasingofthepowersupplywhenitisconnectedtoACpower.
• Referallservicingtoqualifiedservicepersonnelonly.
• Beforereplacingthefuse,identifyandfixanyproblems.
• Replacethefusewithafuseofthespecifiedtypeandrating.
CAUTION
• Useagrounded3pinACsource.
• Thisunitisintendedforindooruseonly.
• Donotoperateorplacethisunitindirectsunlightorinahumidlocation
• Avoidenvironmentswheredustordirtcanenterthepowersupplycasing.
• Donotplacethepowersupplynearaheatsource.
• BeforepluggingintolocalACmains,checktheratinglabelatthebackoftheunitfor110Vor220V
operation.Themodel382275canbepoweredby110Vonly.Themodel382276canbepoweredby
220Vonly.
• Donotblocktheventilationopeningsoftheunit.
• Thisunitmustbeusedwithinthespecifiedrating;excessivecontinuousloadingmaycausedamageto
thepowersupply.
• Thegaugesizeoftheinputpowercablemustbeatleast3“(0.75mm)andthetotallengthofpower
cablemustnotexceed118”(3m)

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PowerSupplyDescription

1. PowerSwitchON/OFF
2. VoltageDisplay
3. CurrentDisplay
4. ConstantVoltageIndicatorLED
5. RearControlIndicatorLED(SwitchesONwheninPreset,RemoteControlorSet
Mode)
6. OutputVoltageControlKnob(Controlsboththemainandauxiliaryoutput
voltage)
7. OutputCurrentControlKnob(Controlsboththemainandauxiliaryoutput
current)
8. PositiveAuxiliaryOutputTerminal(Max.5Amps)
9. NegativeAuxiliaryOutputTerminal(Max.5Amps)
10. ConstantCurrentIndicatorLED
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RearPanelDescription
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

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1. MainOutput(20AmpsMax.)
2. P1,P2andP3RecallSwitch
3. CoolingFanforVentilation
4. ACinputPlugandFuse
5. RemoteControlConnector
6. ModeSwitch

ModeDescriptions
ModeSelection
Thepowersupplyhasfour(4)modesofoperation:NORMAL,PRESET,SETandREMOTE
CONTROLmode.SlidetheModeSelectionSwitchtothedesiredMode.Thepowersupply
defaultstotheNORMALMode.
NormalMode
NormalModeisthefactorypresetmode.Thepowersupply’soutputvoltageandcurrentare
controlledbythedualactionvolumeknobs.Pushtheknobstotogglethecoarseandfine
tuning;noticethesubtlechangesinbrightnessoftherelatedLED.Adjusttheknobtothe
desiredvaluefirstwiththeCoarseadjustmentandthenwiththeFinetuneadjustment.Turn
theCurrentknobgentlyinanydirectiontocheckthepresetcurrentlevel.Thedisplaywill
resumeitsnormalbrightnessafterafewsecondstoconfirmtheadjustment.
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PresetMode
InthePRESETmode,theRearControlLightisswitchedONtoindicatethatthepanelvoltage
andcurrentcontrolsarede‐activated.
Therearethreepresetoutputs,P1,P2andP3,selectableviatheRecallSwitch,locatedonthe
rearofthepowersupply.
Thepresetvaluesarefactorysetperthefollowingtable.

PresetsOutputVoltageOutputCurrent
P15VMaximum
P213.8VMaximum
P325VMaximum

SetMode
IntheSETmode,theVoltageandtheCurrentvaluesforthethreepresets(P1,P2,andP3)can
beprogrammed.
1.
SettheModeSwitchlocatedontherearofthepowersupplytothe“SET”position.
2.
SelectapresetusingtheRecallSwitch(settotheP1,P2orP3position).
3.
UsethefrontpanelVoltageControlKnobtosetthedesiredvoltagevalue.
4.
UsethefrontpanelCurrentControlKnobtosetthedesiredcurrentvalue.
5.
Repeatthisprocedurefortheremainingpresetsifdesired.
6.
MovetheRecallSwitchfromtheSETtothePRESETpositiontostorechanges.
Note: Presetsresideinnon‐volatilememorymeaningthatthevoltageandcurrentsettingsfor
eachpresetareretainedevenwhenthepowersupplyisswitchedOFF.

Caution:ChecktheoutputvoltageofthepresetinusebeforeconnectingtotheLoad.Tochecka
presetvalue,movetheModeSwitchtothePRESETpositionandthenmovetheRecallSwitchto
theP1,P2orP3position.TheVoltageandCurrentsettingsforthecorrespondingpresetwill
display.

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PowerupChecks
1. First,checktheratinglabelofthepowersupplyandmakesureitcomplieswiththeACmainsvoltage
(110Vor220V).Next,settheModeSwitchlocatedontherearofthepowersupplytotheNormal
Position.
2.
Listenforthecoolingfanwhenswitchingonthepowersupply.Thepowersupplyperformsaseriesof
selftestchecksonstartupwhichincludestestingthecoolingfan.Thefanwillstopcompletelyaftera
fewsecondsafterrunningathighspeedindicatingthatitisingoodorder.The
CV , V and A lights
switchONdisplayingvoltageand0.0current.Tocheckthecurrentlevel,turnthecontrolknobone
clickineitherdirection.Thecurrentdisplayreturnsto0.0afterafewseconds.
TheTablebelowillustratestheSelf‐Testsequence:
SelftestdisplayandSequenceTestDescription
Softwareversion
Displaycheck

C.V.Indicatorcheck

C.C.Indicatorcheck
Rearindicatorcheck

C.V.recheck
Testcontinuing
Overvoltageprotectioncheck
Overloadprotectioncheck
Overtemperatureprotectioncheck
Fancheck
Outputoff(remotecontrolmode)

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Operation
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UsingtheControlKnobs
Therotarycontrolknobsofferfine/coarsetuningwithnotchedmovement.
1. Pushtheknobstotogglebetweencoarseandfinetuning,noticethesubtlechangesin
brightnessoftherelatedLED.
2.
Adjusttheknobstothedesiredvaluesbyusingcoarseandthenfinetuning.Thedisplay
willresumeitsnormalbrightnessafterafewsecondstoconfirmtheadjustment.
ConnectingtoUUT(Unitundertest)
1. Connecttheequipmenttothepowersupply.Red(+)isconnectedtothepositivepolarity
inputoftheUUTandBlack(‐)isconnectedtothenegativepolarityinputoftheUUT.
2.
SwitchONthepowersupplyfirst;thepanelmeter&greenCVIndicatorshouldswitch
ON.
3. SwitchONtheUUT;thepanelmeter&greenCVIndicatorshouldremainon.
4.
TheUUTisnowready.Whenoperationiscompleted,switchofftheUUTandthenthe
powersupply.
5. WhendisconnectingthepowersupplyfromtheUUT,disconnecttheremotesensing
wirefirstandthendisconnecttheoutputcables.
WARNING:Donotusethispowersupplywithelectricmotorsforanyreasonor
forchargingpurposesonelectroplatingequipmentorsimilardevices.Return
EMFandvoltagetransientsgeneratedbyelectricmotorscandamagethispower
supply.Thispowersupplywasdesignedforuseonelectronicequipmentonly
andnotintendedforuseonelectricalequipmentofanykind.

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RemoteControl
Remotecontrolismadepossiblethroughtheuseofthesupplied8‐pinRemoteControl
connectorand22AWGwire.TheRemoteControlfeatureoffersremoteadjustmentofvoltage
andcurrentandoutputON/OFFswitching.

RemoteON‐OFFControl
TheRemoteControlON‐OFFfunctioncanbeactivatedinanyoftheoperationalmodes
(NORMAL,PRESET,REMOTE,andSET).Usingthesupplied8‐pinplugand22AWGwire,follow
theproceduresbelow:
1. Removetheblackportionoftheremotecontrolconnectorplugbyremovingthe
screwasshown.






2. IfPIN5isopen,theoutputisON.
3. IfPIN5isshortedtoground(PIN4)theoutputisOFF. 
4. WhentheoutputisOFF,t heC.V.&C.C.LEDwillflash.Thecurrentoutputvoltage
andcurrentsettingwillshowonthepanelmeter .
5. Theoutputvoltage&currentcontrolknobcanbeusedtoadjusttothedesired
valuewhentheoutputisoff. 

RemoteVoltage/CurrentControl

Therearetwomethods(MethodAandMethodB;seebelow)fortheremoteadjustmentof
voltageandcurrent.EachmethodrequiresthattheCurrentremotecontrolportionbe
functionalotherwisetheunitwillbeintheCCmodeallofthetime.
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RemoteControlMethodA:UsingtwoexternalvariableDCvoltagesources
Avariableexternalvoltagesourceof0~5VDCisfedintotheremotecontrolterminaltoadjust
theoutputvoltagelevel.
Warning! Donotinputvoltagehigherthan5V,otherwisetheOverVoltageProtection(OVP)
willbetriggered. 
1. EnsurethattheloadisdisconnectedandthatthepowersupplyisOFF. 
2. UseONLYthewiresfromPort2(Positive)andPort4(Negative)
3. Switchonthepowersupply.
4. Varytheexternalinputvoltage0~5Vtocheckandverifythefulloutput voltage
rangeofthesupply.
5.
Shortthemainoutputwith10AWGwiretochecktheCCdisplaybyvaryingthe
externalvoltagesource.
6. SwitchOFFthepowersupply.

RemoteSocketPINassignmentforexternalvariablevoltagesource
PINFUNCTIONNOTES
1Internal+5VDC50mAmaximum
2VoltageAdjustment0to5V
3CurrentAdjustment0to5V
4Ground
5OutputOFFShorttoground
6Unused
7Unused
8Unused





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RemoteControlMethodB:Usingtwoexternalvariable5kohmresistors
1. EnsurethattheloadisdisconnectedandthatthepowersupplyisOFF.
2. Preparetwo5kohmvariableresistorsasshowninthediagrambelowandusethe
wiresfromPort1,2and4asshown.
3. SwitchthepowersupplyON.
4. AdjustthePin25kohmvariableresistorfromoneendtootherendtocheckand
verifythefulloutputvoltagerangeofthepowersupply.
5. Shortthemainoutputwith10AWGwireandchecktheCCdisplaybyadjustingthe
Pin35kohmvariableresistor.
6. SwitchOFFthepowersupply.
 













RemoteSocketPINassignmentforexternalvariableresistors
PINFUNCTIONNOTES
1Internal+5VDC
2VoltageAdjustmentVariablepartofresistor
3CurrentAdjustmentVariablepartofresistor
4Ground
5OutputOFFShorttoground
6Unused
7Unused
8Unused
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
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
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382275/6-EU-EN v4.3 3/14
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oup
A
C.V.
C.C.
OverloadProtection
OUP:OverVoltageProtection




Thisunithasabuilt‐inover‐voltageprotectionfeature.Intheeventofanoutput
voltageexceedingtheallowablerange(refertothespecificationssectionforrange
limits),protectionwillbetriggeredandtheoutputpowerwillbeswitchedoff.(OUP
warningappears).
Toresetthewarning,switchoffthepowersupplyandremoveallloading.Switchthe
unittoresumenormaloperation.Ifthisproblempersists,pleasecontactExtech
TechnicalSupport.
OTP:OverTemperatureProtection




Theunithousesathermo‐sensorthatmonitortodetermineifanover‐heating
conditionexists.TheOTPwarningwillappearonthedisplayandtheoutputwillswitch
offinover‐heatingconditiondoesexist.Whenthiswarningappears,switchofftheunit
andremoveallloading.
Inthesecases,checktheloadandtheoutputsettingsandthenallowtheunittocool
foratleast30minutes.
Ensurethattheventilationopeningsarenotblockedandthatthepowersupplyhas
properclearance.Ensurethatthecoolingfanisoperational;neverusethepower
supplywithafaultycoolingfan.
OLP:OverLoadProtection



NormallytheoverloadprotectionisprovidedbytheCCconstantcurrentmode.
However,iftheCCmodefailsitmaycauseseriousdamagetothetestpieceortothe
load.OLPisusedtominimizetheextentofthedamagetotheload.Switchoffthe
powersupplyassoonasthiswarningappears.Toresetthiswarning,switchofftheunit
andremoveallloadingandthenswitchtheunitonagain.Ifthisproblempersists,
pleasecontactExtechTechnicalSupport.
A
C.V.
C.C.
A
C.V.
C.C.

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MaintenanceandRepairServices
Cleaningthemeterhousing
Priortocleaningthemeterhousing,disconnectthemainsplugfromthepoweroutlet.Clean
onlywithadamp,softclothandacommerciallyavailablemildhouseholdcleaner.Ensurethat
nowatergetsinsidetheequipmenttopreventpossibleshortsanddamagetotheequipment.
Specifications

RearOutput VariableOutputVoltage1to30VDC
VariableOutputCurrent1to20A
Voltage
Regulation 
Load(10to100%Load)50mV
Line(170to264VAC20mV
Current
Regulation 
Load(90to10%RatedVoltage)100mA
Line(170to264VACVariation)50mA
Ripple&Noise(peak‐peak)Voltage50mV
CurrentRipple&Noise(rms)30mA
FrontOutput VariableOutputVoltage1to30VDC
VariableOutputCurrent1to5A
Voltage
Regulation

Load(10to100%Load)350mV
Line(170to264VAC20mV
Current
Regulation

Load(90to10%RatedVoltage)100mA
Line(170to264VACVariation)50mA
Ripple&Noise(peak‐peak)Voltage50mV
CurrentRipple&Noise(rms)30mA
MeterAccuracy VoltageMeter±(0.2%+3digits)
CurrentMeter±(0.2%+3digits)
TrackingOver
Voltage
Protection

1to5VDefaultValueis+2V
5to20VDefaultValueis+3V
20to30VDefaultValueis+4V

382275/6-EU-EN v4.3 3/14
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InputVoltage100to120VAC50/60Hz(Model382275)
210to230VAC50/60Hz(Model382276)
RatedLoadInputCurrent3.1AModel382276)
5.9A(Model382275)
Efficiency87%atoptimalload
SwitchingFrequency75to95KHz
CoolingMethodThermostaticControlFanfromZerotofullspeed
Protections Overload,ShortCircuitbyConstantCurrent,Output
TrackingOverVoltage,OverTemperature
TransientResponseTime1.5ms(50‐100%ofload)
PowerFactorControl>0.95atoptimalload
SpecialFeaturesThree(3)userdefinedpresetsandRemoteControl
OperatingHumidityRange10to80%RH
Altitude 2000meters(7000Feet)
PollutionDegree2
MainSupplyVoltageFluctuation±10%ofthenominalvoltage
Dimensions(WxHxD)200x90x215mm(7.9x3.5x8.5“)
Weight2.6kg(5.7lbs)
ApprovalsCEEMC:EN55011,55022LVD:EN60950,61010
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Copyright©2014FLIRSystems,Inc.
Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform.
www.extech.com