Maynuo Electronic M97 series User manual

USER S Guide
ProgrammableDC ElectronicLoad
ModelM9711 M9712M9712BM9712CM9712B30
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ContentUSER SGuide.....................................................................................................................i
ProgrammableDC ElectronicLoad....................................................................................................i
ModelM9712 M9712BM9712CM9712B30.....................................................................................i
Chapter1Overview...............................................................................................................................1
Chapter2TechnicalSpecifications........................................................................................................2
2.1MainTechnicalSpecifications.................................................................................................2
2.2DC ElectronicLoad DimensionalLineDrawings...................................................................4
Chapter3QuickReference....................................................................................................................5
3.1Power-onself-test......................................................................................................................5
3.2IntheEvent ofaProblem........................................................................................................5
3.3Front PanelOperation andBack PanelOperation................................................................6
3.4Keypad Directions ....................................................................................................................7
3.5Menu Operation........................................................................................................................8
Chapter4PanelOperation...................................................................................................................11
4.1BasicOperation Mode............................................................................................................11
4.1.1Constant Current Operation Mode (CC) .......................................................................11
4.1.1.1SetupaStandardConstantCurrentMode......................................................................11
4.1.1.2LoadingandUnloading ConstantCurrentMode...........................................................12
4.1.1.3SoftStartConstantCurrentMode.................................................................................13
4.1.1.4ConstantCurrentModeShifting intoConstantVoltageMode.......................................13
4.1.2Constant ResistanceOperation Mode (CR) .............................................................14
4.1.2.1Settingup aStandardConstant ResistanceMode...............................................15
4.1.2.2Loading and Unloading Constant ResistanceMode.............................................15
4.1.2.3ShiftingfromConstant ResistancetoConstant VoltageMode............................16
4.1.3Constant Voltage Operation Mode (CV)....................................................................16
4.1.3.1SettingUpStandardConstant Voltage Mode........................................................17
4.1.3.2Loading and Unloading Constant Voltage Mode...................................................17
4.1.3.3SoftStart Constant Voltage Mode...........................................................................18
4.1.4Constant PowerOperation Mode (CW).....................................................................18
4.1.4.1Settingup aStandardConstant PowerMode.......................................................19
4.1.4.2Loading and Unloading Constant PowerMode.....................................................19
4.2DynamicTesting Operation...................................................................................................20
4.2.1ContinuousMode (CONTINUOUS)...........................................................................20
4.2.2Pulsed Mode (PULSED).............................................................................................20
4.2.3TriggerMode(TRIGGER)............................................................................................21
4.2.4Setting up Dynamictest operationalParameters.....................................................21
4.2.5WaveformControl........................................................................................................22
4.2.5.1SquareWave............................................................................................................22
4.2.5.2TriangularWave.......................................................................................................22
4.2.5.3TrapezoidalWave.....................................................................................................22
4.2.6TriggerControl.............................................................................................................22
4.2.7ListFunction(Mode SequenceSteps)......................................................................22
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4.2.7.1.List Operation...........................................................................................................23
4.2.7.2ExecutingListFunction............................................................................................23
4.2.8AutomaticTesting Function........................................................................................23
4.2.8.1AutomaticTest Operation........................................................................................24
4.2.8.2Settingup AutomaticTest TriggerOutput Mode...................................................25
4.2.8.3ExecutingAutomaticTestFunction........................................................................25
4.3InputControl............................................................................................................................26
4.3.1ShortCircuit Operation(SHORT)...............................................................................26
4.3.2Input On/Off Operation................................................................................................26
4.4ElectronicLoad OperationRange.........................................................................................26
4.5ProtectionFunctions...............................................................................................................27
4.5.1OverVoltage Protection (OV).....................................................................................27
4.5.2OverCurrent Protection (OC).....................................................................................27
4.5.3OverPowerProtection (OW)......................................................................................28
4.5.4Input PolarityReversed...............................................................................................28
4.5.5OverHeat Protection(OH)...........................................................................................28
4.6RemoteMeasurement Function............................................................................................28
4.7BatteryTesting........................................................................................................................30
4.8Communication protocol........................................................................................................31
4.8.1Introduction...................................................................................................................31
4.8.2Setup Baudrate............................................................................................................32
4.8.3Data...............................................................................................................................32
4.8.4Function Code..............................................................................................................32
4.8.5Errorchecking(CRC)..................................................................................................32
4.8.6CompleteCommand FrameAnalysis........................................................................33
4.8.7CoilWithThe RegisterAddress Allocation ...............................................................35
4.8.8DefinitionOf The Command RegisterCMD..............................................................37
4.8.9Common OperationalFunction Descriptions............................................................38
4.9Remoteoperation...................................................................................................................42
4.9.1M-131 orM-133 Communication Cable.....................................................................42
QuickReminders.................................................................................................................................46
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Chapter1Overview
The new M97XX seriesprogrammableDC electronicload isanewgeneration product designed from
Maynuo ElectronicCo.,Ltd.Incorporatinghigh-performancechips, the M97XX seriesdelivershigh speed and
high accuracywitharesolution of 0.1mV and0.01 mA(basicaccuracyis0.03% and basiccurrentrisespeed is
2.5A/μs).M97XX serieshavewide application fromproduction linesforcellphone chargers, cell phone
batteries, electronicvehiclebatteries, switching powersupplies, linearpowersupplies, and LEDdrivers, to
researchinstitute,automotiveelectronic,aeronauticand astronautic,maritime, solarcelland fuelcelletc.test
and measurementapplications.
FEATURES
•Sixhigh speed operation modes: CC,CR,CV,CW,CC+CV,CR+CV
•Overcurrent, overvoltage, overpower, overheating andpolarityreversal protection
•High-luminancevacuumfluorescent display(VFD)screen withtwoline,fourchanneldisplay
•Intelligentfansystemwill automaticallyactivatebased on changing ambienttemperatures
•Soft-starttimesetting, activating the powersupplyinaccordancewiththe setvoltage value
•Battery test and short-circuittestfunctions
•Capableof rising edge and falling edge dynamictesting
•Supporting externaltriggeron eitherinput oroutput
•External current waveformmonitorterminaloutputterminal
•Supportsremotevoltage compensation and multi-datastorage
•Power-on-self-test, softwarecalibration and standardrack mountable
•Editsarbitrarywaveformsinlistfunction.
•AvailablewithRS232/RS485/USBserialinterfaces.
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Chapter2TechnicalSpecifications
2.1MainTechnicalSpecifications
ThisUserManualcoversonlytheM97XX programmableDCelectronicloads. Pleaserefertothe
followingtablethat detailsthe specificparametersof the150W-300WM97XX DC electronicloads.
3.5KgWeight
108*214*365W*H*D(mm)Dimension
– 10 ～ 70 – 10 ～ 70 – 10 ～ 70 – 10 ～ 70 Nonoperating
0 ～ 40 0 ～ 40 0 ～ 40 0 ～ 40 Operating
Temperature
≒ 25m Ω≒ 300m Ω≒ 35m Ω≒ 55m Ω
Resistance(C
R)
0V0V0V0VVoltage(CV)
66A ≒ 6.6A ≒ 18A ≒ 3.3A ≒ 33A ≒ 3.3A ≒ 33A ≒ 3.3ACurrent(CC)
ShortCircuit
CCsoft-startup Time1mS;2mS;5mS;10mS;20 mS;50mS;100 mS;200mSAccuracy:+ 15%offset+10%FS
DynamicMeasurementTransition List:0-25kHZ;2.5A/uS;T1&T2:60uS-999S;Accuracy:+ 15%offset+10%FS
BatteryMeasruementBatteryInput:0.5-120V;Max. Measurement:Capacity=999/H;Resolution=0.1mA;TimeRange=1S-16HS
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
10mW1mW10mW1mW10mW1mW10mW1mWResolution
300W100W300W100W300W100W150W100WWattWMeasurement
(Voltageand
currentinput
value ≥ 10%full
measument)
0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FSAccuracy
1mA0.1mA0.1mA0.01mA0.1mA0.01mA0.1mA0.01mAResolution
0-60A0-6A0-15A0-3A0-30A0-3A0-30A0-3ACurrent
IMeasurement
0.015%+0.03%FS0.015%+0.03%FS0.015%+0.05%FS0.015%+0.03%FS0.015%+0.03%FS0.015%+0.02%FS0.015%+0.03%FS0.015%+0.03%FSAccuracy
10mV1mV10mV1mV10mV1mV10mV1mVResolution
0-150V0-19.999V0-500V0-19.999V0-150V0-19.999V0-150V0-19.999VVoltage
VMeasurement
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
10mW1mW10mW1mW10mW1mW10mW1mWResolution
0-300W0-300W0-300W0-300W0-300W0-300W0-150W0-150WRangeCWMode
(Voltageand
currentinput
value ≥ 10%full
measument)
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
16bit16bit16bit16bit16bit16bit16bit16bitResolution
0.03 Ω -5K0.03 Ω -10K0.3 Ω -5K0.3 Ω -10K0.03 Ω -5K0.03 Ω -10K0.03 Ω -5K0.03 Ω -10KRangeCRMode
(Voltageand
currentinput
value ≥ 10%full
measument)
0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FSAccuracy
10mV1mV10mV1mV10mV1mV10mV1mVResolution
0.1-150V0.1-19.999V0.1-500V0.1-19.999V0.1-150V0.1-19.999V0.1-150V0.1-19.999VRange
CVMode
0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FSAccuracy
1mA0.1mA1mA0.1mA1mA0.1mA1mA0.1mAResolution
0-60A0-6A0-15A0-3A0-30A0-3A0-30A0-3ARange
CCMode
0-150V0-500V0-150V0-150VVoltage
0-60A0-15A0-30A0-30ACurrent
300W300W300W150WPower
InputRaitng
M9712CM9712BM9712M9711Model
3.5KgWeight
108*214*365W*H*D(mm)Dimension
– 10 ～ 70 – 10 ～ 70 – 10 ～ 70 – 10 ～ 70 Nonoperating
0 ～ 40 0 ～ 40 0 ～ 40 0 ～ 40 Operating
Temperature
≒ 25m Ω≒ 300m Ω≒ 35m Ω≒ 55m Ω
Resistance(C
R)
0V0V0V0VVoltage(CV)
66A ≒ 6.6A ≒ 18A ≒ 3.3A ≒ 33A ≒ 3.3A ≒ 33A ≒ 3.3ACurrent(CC)
ShortCircuit
CCsoft-startup Time1mS;2mS;5mS;10mS;20 mS;50mS;100 mS;200mSAccuracy:+ 15%offset+10%FS
DynamicMeasurementTransition List:0-25kHZ;2.5A/uS;T1&T2:60uS-999S;Accuracy:+ 15%offset+10%FS
BatteryMeasruementBatteryInput:0.5-120V;Max. Measurement:Capacity=999/H;Resolution=0.1mA;TimeRange=1S-16HS
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
10mW1mW10mW1mW10mW1mW10mW1mWResolution
300W100W300W100W300W100W150W100WWattWMeasurement
(Voltageand
currentinput
value ≥ 10%full
measument)
0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FS0.03%+0.08%FS0.03%+0.05%FSAccuracy
1mA0.1mA0.1mA0.01mA0.1mA0.01mA0.1mA0.01mAResolution
0-60A0-6A0-15A0-3A0-30A0-3A0-30A0-3ACurrent
IMeasurement
0.015%+0.03%FS0.015%+0.03%FS0.015%+0.05%FS0.015%+0.03%FS0.015%+0.03%FS0.015%+0.02%FS0.015%+0.03%FS0.015%+0.03%FSAccuracy
10mV1mV10mV1mV10mV1mV10mV1mVResolution
0-150V0-19.999V0-500V0-19.999V0-150V0-19.999V0-150V0-19.999VVoltage
VMeasurement
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
10mW1mW10mW1mW10mW1mW10mW1mWResolution
0-300W0-300W0-300W0-300W0-300W0-300W0-150W0-150WRangeCWMode
(Voltageand
currentinput
value ≥ 10%full
measument)
0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FS0.1%+0.1%FSAccuracy
16bit16bit16bit16bit16bit16bit16bit16bitResolution
0.03 Ω -5K0.03 Ω -10K0.3 Ω -5K0.3 Ω -10K0.03 Ω -5K0.03 Ω -10K0.03 Ω -5K0.03 Ω -10KRangeCRMode
(Voltageand
currentinput
value ≥ 10%full
measument)
0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FS0.03%+0.02%FSAccuracy
10mV1mV10mV1mV10mV1mV10mV1mVResolution
0.1-150V0.1-19.999V0.1-500V0.1-19.999V0.1-150V0.1-19.999V0.1-150V0.1-19.999VRange
CVMode
0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FS0.03%+0.05%FSAccuracy
1mA0.1mA1mA0.1mA1mA0.1mA1mA0.1mAResolution
0-60A0-6A0-15A0-3A0-30A0-3A0-30A0-3ARange
CCMode
0-150V0-500V0-150V0-150VVoltage
0-60A0-15A0-30A0-30ACurrent
300W300W300W150WPower
InputRaitng
M9712CM9712BM9712M9711Model
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Model M9712B30
Power 300W
Current 0-30A
InputRating
Voltage 0-500V
Range 0-3A 0-30A
Resolution 0.1mA 1mA
CC Mode
Accuracy 0.05%+0.05%FS 0.05%+0.08%FS
Range 0.1-19.999V 0.1-500V
Resolution 1mV 10mV
CVMode
Accuracy 0.03%+0.02%FS 0.03%+0.05%FS
Range 0.3Ω-10K 0.3Ω-5K
Resolution 16 bit 16 bit
CR Mode
(Voltageand currentinput
value ≥10%full measument)
Accuracy 0.1%+0.1%FS 0.1%+0.1%FS
Range 0-300W 0-300W
Resolution 1mW 10mW
CWMode
(Voltageand currentinput
value ≥10%full measument)
Accuracy 0.1%+0.1%FS 0.1%+0.1%FS
Voltage 0-19.999V 0-500V
Resolution 1mV 10mV
VMeasurement
Accuracy 0.015%+0.03%FS 0.015%+0.05FS
Current 0-3A 0-30A
Resolution 0.01mA 0.1mA
I Measurement
Accuracy 0.05%+0.08%FS 0.08%+0.08%FS
Watt 100W 300W
Resolution 1mW 10mW
WMeasurement
(Voltageand currentinput
value ≥10%full measument)
Accuracy 0.1%+0.1%FS 0.1%+0.1%FS
BatteryMeasurementBatteryInput:0.5-
120V;Max. Measurement:Capacity=999/H;Resolution=0.1mA;
TimeRange=1S-16HS
DynamicMeasurementTransition List:0-25kHZ;2.5A/uS;T1&T2:60uS-999S;Accuracy:+ 15%
offset+10%FS
CC soft-startupTime1mS;2mS;5mS;10mS;20 mS;50 mS;100mS;200mSAccuracy:+ 15%
offset+10%FS
Current(CC) 3.3A 33A
Voltage(CV) 0V
ShortCircuit
Resistance(CR) 280mΩ
Operating 0～40℃
Temperature Nonoperating –10℃～70℃
Dimension W*H*D(mm) 108*214*365
Weight Kg 3.5
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2.2DCElectronicLoadDimensionalLineDrawings
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Chapter3Quick Reference
3.1Power-onself-test
Verifythatyouhavereceived the followingitemswithyourXT98XXDC ProgrammableElectronic
Load.. Ifanythingismissing, contact yournearest XiTRONauthorized SalesRepresentative'sOffice.
□One powercordforyourlocation/country
□The M97xx User sManual
□One CD (ifyou havepurchased the optionalcommunication accessories)
□One communication cable(ifyou havepurchased the optionalcommunication accessories)
First, makesurethe DC electronicload hasbeen correctlyconnected andpowered on.Pleaserefertothe
followingtableforthe detailed operationalsteps.
Procedure Display Explanation
1. Power-upthe DC
electronicload
SYSTEMSELF TEST
Vxxx
Theelectronicloadpowersupand the VFD
paneldisplaysthe firmwarerevision level
#.
EPROMERROR
EEPROMdamageorlost dataat last power
off session.
2.Waitfor1safter
turningthe DC
electronicload on
ERRORCAL.DATA
EEPROMlost calibration data.
3.Wait another2S
afterERRORhas
occurred
xxxxxxxVxxxxxxxA
xxxxxxxWxxxxxxxX
Displaysthe actualinput voltagean
dcurrent
valuesand theactualpowerand reactant
settingvalues.
3.2IntheEventofaProblem
Ifthe DC electronicload failstopowerup, the followingtroubleshootingstepswill helptodetermine the
problem.
1) Makesurethe powercordisconnectedproperlyandthe Powerswitchhasbeen pushedintoON..
2) Check the powervoltagesettingon the back panel.
Therearetwovoltagesthat powerthe DC load: either110Vor220V. Pleasemakesurethe right voltage
settinghasbeen selected manuallyforyourarea.
3) Check the DC load'sfuse..
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Iffuseisopen, pleasereplaceitwithanotherfusethat meetsthe followingspecifications.
Model Fuse specification
(110VAC)
Fuse specification
(220VAC)
M9711 T0.5A250V T0.3A250V
M9712 T0.5A250VT0.3A250V
M9712B T0.5A250V T0.3A250V
M9712C T0.5A250V T0.3A250V
M9712B30 T0.5A250V T0.3A250V
4)．Replacethe Fuse
Open the plasticcoveron the rearpanelofthe DC electronicload withaflat screwdriver. (See table
3.1)andfind the open fuse. Thenreplacethe open fusewithanewone.
Diagram3.1FuseLocation
3.3FrontPanelOperationandBack Panel Operation
PleaserefertoDiagram3.2forthe front panelofM97XX DC electronicload.
Fuselocation
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Diagram3.2Front panel
①Theupperhalfisthe black VacuumFluorescent Display(VFD)displayscreen.
②Robtaryknob, Turntoadjust the settingvalues.
③Numerickeys0-9, ESCkey, secondarykeyfunctions
④Keypad: set upthecurrent,voltage,power,resistancemodes(I-set, V-set, P-set, R-set, Shift and
On-Off);Scrollthroughmenusandoptions
⑤Input terminals
⑥Powerswitchtoturnon/off the instrument
⑦Up-Downkeys, Enterkey
Diagram3.3the back paneloftheM97XX SeriesDC electronicload
BNC Outconnectorfor0-full rangecurrent, thatcorrespondsto0-10Voutput.AnOscilloscope
can beconnectedheretoviewdynamicwaveforms.
RemoteMeasurement terminalsand triggerforinput/output interface
DBSub9pinmultifunctionalcommunicationsinterfaceforRS232,RS485 and USB serialbuses
(withoptionalM133Dsub9toUSB conversion cable). DonotconnectanM131cablewith
standardRS-232 voltages on thecables connectors.Doing somay damagetheinstrument
and isnotcoveredbyWARRANTY.
3.4KeypadDirections
1
9
0-9numerickeys
Esc
Esc key(enablesexit fromanyworkingcondition/mode)
I-Set
SwitchtoCC mode
22
33
11
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Settingupaconstant current
V-Set SwitchtoCVmode
Settingupaconstant voltage
P-Set SwitchtoCWmode
Settingupaconstant power
R-Set SwitchtoCR mode
Settingupaconstant resistance
Shift Multi-purpose
Used inconjunctionwithotherkeystoperformdiversefunctionsand
applications(forexample: shift+0/Menu keywill launchthe menu
function)
On/Off TurnDC electronicLoad on/off
Scroll upmenu choices
Scroll downmenu choices
Enter Confirmation ofsettingskey
3.5MenuOperation
Press the Shift+0/Menu keysinsequencetoaccess the menu functionsand theVFDscreen
displaysthe menu choices: CONFIG, SYSTEMSET,LIST,AUTOTEST,SHORTCUTAND EXIT.. Select
the menu itemsbypressingthe ▲and ▼cursorkeys and then press the Enter keytoopen the menu
itemyou chose.Orpress the Esc keytoreturntotheoutofthe menu function.
MENU
CONFIG
INPUTRECALL Resetsthe output tothesamestateasthe last time
used when theloadisturned off; ortothe OFF state
when the DC electronicload ispowered back on
ON Retainsthe samesettingswhen the DC
electronicload isturned off
OFF Setstheoutputtothe OFF statewhen the DC
electronicload ispowered on.The load will work
on CC mode
KEY PADSOUND
SET-UP Setsthekeypad sounds
ON Willactivateabeepwhen anykeyispressed.
OFF Deactivatesthe beepwhen anykeyispressed
CONNECTMODE Connect mode
MAXTIDLEXING? Multi
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SEPARATE Single
BAUD RATESET Settingthe modemBaud rate
2400 baud
9600 baud
14400baud
28800baud
57600baud
115200 baud
COMM.PARITY SettingCommunicationsParitymode
NONE NoParity
EVEN Even Parity
ODD Odd Parity
ADDRESS SET Settingan Address
1~200 Theaddress isthe input number(1-200).
KEY LOCK SET Settingthe passwordtounlock thekeypad (when 0or
null isset, thereisno passwordset)
EXIT
SYSTEMSET
MAXCURRENTSET Settingthe maximumCurrent.
Ifthe maximumcurrent set ishigherthan3A, the load
isinhighrange. Otherwise, it isinlowrange.
MAXVOLTAGESET Settingthe maximumVoltage.
Ifthe maximumvoltageset ishigherthan 20V, the
load isinhighrange. Otherwise, it isinlowrange.
MAXPOWERSET Settingthe MaximumPower.
TERMINALSETSelectingthe input terminal
FRONT Select theinput terminalon the front panel
BACK Select theinput terminalon the back panel
EXIT
LIST
LOADLIST Chooselist files,1~8
EDITLIST Edit list files
MINIMUMTIME
Edit minimumtime(0.02~1310.7mS)
LISTMODE List output mode
CONTINUOUS Continuousmode
END HOLD Retainsthe last output voltagelevelafter
the entiresequenceissuccessfully
completed
END RESET Retainsthe load OFF stateafterthe
entiresequenceissuccessfully
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completed
STEP LENGTH
Steplength(1~200)
STEP n 1~wholestep length
CURRENT Set current
TIME Duration
EXIT
AUTO TEST
LOADAUTO TEST Select automatictest files1~8
EDITAUTO TEST Edit automatictest files
STEP LENGTH Set theentiresteplength
STEP n
WORKMODE
LOADOFF MODE Load OFFmode
CC MODE Constant Current mode
CVMODE Constant Voltagemode
CPMODE Constant Powermode
CR MODE Constant Resistance
mode
SHORTMODE Short circuit mode
TESTMODE Qualification testing mode
TESTCURRENT Test Current
TESTVOLTAGE Test Voltage
TESTPOWER Test Power
TESTRESI Test Resistance
DELAYTIME Test delaytime
between(0.2~25.5S)
INPUTxxxx Input theparametersdesired, for
example: CC mode, 1A
MINIMUMxxxx Input theminimumlowerlimit
MAXIMUMxxxx Input themaximumupperlimit
SET-UPAUTO TEST
TRIGGER Triggeroutput selection
PASS Triggeroncewhen passing the
test
FAIL Triggeroncewhen failingthe test
TESTEND Triggeroutputisinitiatedwhen
test ends
DISABLE Disabletriggeroutput
OUTPUT Output electricalcharacteristics selection
PULSE Pulseoutput
LEVEL Voltageleveloutput
EXIT
EXIT
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Chapter4PanelOperation
4.1BasicOperationMode
Therearefouroperation modesforthe DC electronicload:
1. Constant Current (CC)
2. Constant Voltage(CV)
3. Constant Resistance(CR)
4. Constant Power(CW)
4.1.1ConstantCurrentOperationMode(CC)
Inthismode,theDC electronicloadwill synchronizewithacurrentinaccordancewiththe
programmed value regardless ofthe inputvoltage.PleaserefertoDiagram4.1.Ifthe maximumcurrent
value ofthe powersupplyundertestislowerthan theconstantcurrent value set, the electronicloadmight
fail toautomaticallyadjusttotheselevels.Accordingly,the constantcurrentandvoltageofthe measured
powersupplyshouldbeadjusted lower..
Load current
I
V
Load voltage
Current Set
Load current
I
V
Load voltage
Current Set
Diagram4.1Constant Current Mode
4.1.1.1Setup aStandardConstantCurrentMode
Press theI-SETkey andtheVFDdisplaywill show STANDARDCURR=xxxxxxxxA,thepresent
constantcurrentvalue.Press the numerickeysand decimalpointkeytoentertheconstantcurrentvalue
desired,followed bypressingthe Enterkey toconfirmthe setting.-TheDC ElectronicLoadloadwill
nowbeinthe standardconstant current mode.
Ifthe inputstateisin OFF state,then the word OFF willappearinupperrightcornerofthe VFD
display.Press the On/Off keytochangetheload'sinputstatetoan ON state.Now CC or Unreg will
appearinthe upperrightcornerofthe VFDdisplay. . Displaying CC meansthe load hasbeensuccessfully
setwiththeexpectedconstantcurrentvalue;if Unreg isdisplayed,theloadcouldntadjustitselftothe
constant current value that wasentered. Pleasecheck todetermine whetherornotthe powersupplyunder
testhastheproperconnectionsandhasbeenturnedon;alsocheck tomakesurethatthedesired constant
current value iswithinthe rangeofthe powersupplyundertest.
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Ifyouwanttofine tunethe constantcurrentvalue,rotatethe encoderknobtoadjustthevalue.
Rotatingclockwisewill increasethe value and rotating itcounter-clockwisewilldecreasethe value. Note: if
the constant current value youwanttoset isbeyondthemaximumconstant currentvalue capabilityofthe
DC load,the currentvalue will stopincreasing even ifyou continue torotatetheencoderknobclockwise.
Atthispoint, thelowerlowerrightcornerofthe VFDpanelwill displaytheconstantcurrentvalue youset.
Withinthisnumbersequence,if the cursorunderlinesone particulardigit, thatdigitrequiresadjustment. If
userswanttomakeadjustmentstofinetunetheaccuracy,depress the rotaryencoderknob.Everytime
the rotaryencoderispressedthe cursorwill moveforwardtothepreviousdigit.
4.1.1.2Loading and Unloading ConstantCurrentMode
Loadingand unloadingCC mode can protectthepowersupplyundertestfromdamage.When the
voltageofthe powersupplyunderteststartstoincrease,the loadwillautomaticallyadjustitselftothe
open-circuitstate,Theloadthen carriesthepowersupplybeingtested and adjustsitselftothe current
value ofthe UUTsetwhen the voltageofthe UUTincreased tothe ONSET loadingvoltagelevel.When the
voltageofthe powersupplyundertestbeginstodecreasetothe OFFSET unloadingvalue,theload will
againautomaticallyadjust itselftothe open-circuit state. Ifthe ONSET loadingvoltagevalue ishigherthan
the OFFSET unloadingvoltage,the load can avoidfrequentcarryingand unloadingatthecriticalpointof
unloadingvoltage; sothepowersupplyundertest willbewell protected.
Diagram4.2Loadingand UnloadingMode
When instandardconstantcurrentmode,pressingthe Shift+1(V_Level) keysinsequenceputsthe
DC ElectronicLoad intothe loadingandunloading CC mode.When the VFDdisplayshows ONSET
VOLT=xxxxxxxxV indicatingthe currentloadingvoltage,usethe numerickeysand decimalpointkeyto
entertheloadingvoltagevalue desired,then press theEnter keytoconfirmthe setting.Nowthe VFDpanel
will display OFFSETVOLT=xxxxxxxxV indicatingthe currentunloadingvoltagelevel.Press the numeric
keysand decimalpointkeytoenterthe unloadingvoltagevalue desired,followed bypressingthe Enter
keytoconfirmthe setting.Accordingly,the DC ElectronicLoad willenterintothe loadingand unloading
constantcurrent mode between the twopreset limitsautomatically
If the inputstateis OFF ,then the upperrightcornerof the VFDpanelwillshowthe word OFF.Press
the - On/Off keytochangetheinput stateback toON . Then theupperrightright cornerofthe VFDdisplay
T
U
ONSET
ON
OFFOFF
T
U
ON
OFFOFF
OFFSET
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will showthe word CC_UN or Unreg. CC_UN meansthe loadwassuccessfullysetintotheexpected
constantcurrent value; Unreg meanstheloadcouldnotadjustitselftothedesired constant current value.
Pleasecheck thatthe powersupplyundertest hasbeen correctlyconnected andpowerswitched on; make
surethatthe voltageset isnormaland theselectedconstantcurrent value iswithinthe rangeofthe UUT.
Whileinloadingand unloadingCC mode,press the Shift+1(V_Level)keysinsequenceand the DC
ElectronicLoadwillrevert back intothe standardconstant current mode.
4.1.1.3Soft StartConstantCurrentMode
The Soft Start CC mode enablestheDC ElectronicLoad tofunctionsasan inductiveload, simulating
an inductancevalue whichisindirect proportion withthe risetimeofthe soft start. Inthismode, the power
supplyundertest canavoidbeingdamaged byacurrent strike.
Loadcurrent
I
T
RisingTime
Loadcurrent
I
T
RisingTime
Diagram4.3Soft Start Current Mode
When instandardCCmode,pressingthe Shift+2(S_Start) keysinsequenceplacesthe load inthe
softstartCCmode.When the VFDdisplayshows Rising TM=xxxxxxxxvmS indicatingthe currentrise
time, usethenumerickeysanddecimalpoint keytoenterthe current risetimedesired. Followbypressing
the Enter keytoconfirmthe settingand the load will enterintothe soft start CC mode.
Ifthe input stateis OFF, then the upperright cornerofthe VFDdisplaywillshowthe word OFF. Press
the On/Off keytochangethe inputstateto ON .Then theupperrightcornerof the VFDdisplaywill show
the word CC_S or Unreg.Showing CC_S meansthe load hasbeen successfullysetwiththe desired CC
value; Unreg on the displaymeansthe load couldn t adjustitself tothe desired CCvalue.Check toassure
that thepowersupplyundertest hasbeen correctlyconnected and powered on; makecertainthat the -CC
value selectediswithintherange oftheUUT.When theShift+2(S_Start)keysarepressed insequence,
the loadingand unloadingCC mode,ofthe DC ElectronicLoadwillrevertback intothe standardCC mode.
Note: The risetimeisautomaticallyregulated and set toavalue of20μStimesaround number.
4.1.1.4ConstantCurrentModeShifting intoConstantVoltageMode
When the CC mode shiftsintoCVmode,damagetothe powersupplyundertestfromcurrentstrikeis
avoided.
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I
V
Loadinput voltage
I
V
Loadinput voltage
Diagram4.4ConstantCurrentShift Mode back intoConstant VoltageMode
When instandardconstant currentmode, press the Shift+4(CC+CV) keys toenterintotheconstant
currentshifttoconstantvoltagemode.When the VFDdisplayshows CC TOCVVOLT=xxxxxxxxV
indicatingthecurrentconstantvoltagevalue,press the numerickeysanddecimalpointkeytoenterthe
constant voltagevalue desired followed bypressingthe Enter keytoconfirm.Nowthe load will enterinto
the constant current shift mode intoconstant voltagemode.
Ifthe inputstateisin OFF ,thentheupperrightcornerofthe VFDdisplaywill showthe word OFF.
Press the On/Off keytochange theinputstateinto ON.The upperrightcorneroftheVFDdisplaywill
showthe combination ofCC+CV or Unreg.When CC+CV isdisplayed,the DC Electronicloadhasbeen
successfullysetintothe desired CC value;bydisplaying Unreg meansthe load couldnotadjustitselfto
the selectedCC value. Check that theunit undertesthasbeen connected correctlyand powered on. Also,
assurethatvoltagelevelisnormal.
When inthe loadingand unloadingconstantcurrentmode,pressing the Shift+4(CC+CV)keyswill
makethe load revert back intothe standardconstant current mode.
4.1.2ConstantResistance OperationMode(CR)
Inthismode,the DC ElectronicLoad will synchronizetoacurrentlinearlyproportionaltotheinput
voltagescaled to-the resistanceprogrammed. Pleaserefertothe Diagram4.5.
Note: when thevoltageoftheunitundertestissettoo highandthe resistancesetistoolow,either
the unit undertest will consumethe excess currentand beshock damaged, ortheDC ElectronicLoadwill
fail toautomaticallyadjusttotheconstantresistanceand the load will sufferthe shock damagefromthe
excess current.
I
V
Loadcurrent
Loadinput voltage
Slopresistanceset
I
V
Loadcurrent
Loadinput voltage
Slopresistanceset
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Diagram4.5ConstantResistanceMode
4.1.2.1SettingupaStandardConstantResistance Mode
By pressingthe R-SET keythe VFDdisplaywill show STANDARD RESI=xxxxxxxx indicatingthe
presentconstant resistance. Inordertoplacethe DC ElectronicLoad intothestandardconstant resistance
mode,press the numerickeysanddecimalpointkeytoselctthedesired values.Finally,afterthevalues
areselected press the Enter keytoconfirmthe setting.
When the inputstateisin OFF,theupperrightcorneroftheVFDdisplaywill showthe word OFF.
Press the On/Off keytochangetheinputstateto ON. Nowthe upperrightcornerofthe VFDdisplaywill
showeither CR or Unreg.-CR meansthe loadhasbeen successfullysetintotheexpectedconstant
resistancevalue; Unreg meansthe load wasunableadjustitself tothe desired constantresistancevalue.
Verifythattheunitundertestisconnected correctlyand turned on;besurethe resistancevalue
selected iswithinthe outputcurrentofthe powersupplyundertestsothatitcan sourcethe expected
amount ofresistancetodrivethe DC Load..
Ifyou needtoadjustthe constantresistancevalue,rotatethe encoderknobtochangethe value.
Rotatingclockwiseisincreasesthe value whilerotatingcounter-clockwisedecreasesthe value.
Nowthelowerrightcornerof the VFDdisplayshowsthe constantresistancevalue set, butif underthe vale
acursorisblinkingitmeansthe numberset, isinneed offurtheradjustment. -When userswantto
adjustorfine tune the accuracy,simplypushinon the rotaryencoderknob.. Eachclick the encoderis
rotated movesthe cursorleft orright on the VFDscreen.
4.1.2.2Loading and Unloading ConstantResistance Mode
Figure4..1.1.2illustratestheCR loadingand unloading mode theoryofoperation.
When instandardconstantresistancemode,press the Shift+1(V_Level) keystoenterthe CR loading
andunloadingmode.When theVFDdisplayshows ONSETVOLT=xxxxxxxxV,itindicatesthecurrent
load voltagestate.Pressingthe numerickeysand decimalpointkeywillenterthe load'sdesired voltage
setting.Pressingthe Enter keywill confirmthesetting.Nextthe VFDwill display OFFSET
VOLT=xxxxxxxxV indicatingthe needtosetanoffsetvoltage.Pressingthe numerickeysanddecimal
pointkeywill setthat desired offsetvoltage., Nowpress the Enter keytoconfirmthe setting.Nowthe DC
ElectronicLoadwillbeinthe CR load /unload mode.
If the inputstateshowsOFF,then the upperrightcornerof the VFDpanelwilldisplay OFF.Press the
On/Off keytochangetheinputstateto ON.. Nowtheupperrightcornerofthe VFDdisplaywill showeither
CR_UN or Unreg. CR_UN meansthe load hasbeen successfullysetintothe desiredconstantresistance
value; Unreg meanstheloadcouldnotaccept theconstantresistancevalue set. Checktosee thepower
supplyundertestiscorrectlyconnected and turnedon;makesurethevoltageisnormaland the output
current ofthe unit undertest iswithinthe rangethat the can driveDC ElectronicLoad.
Fromthe loadingand unloadingCC mode,pressthe Shift+1(V_Level) keysand theDC Electronic
Load will the standardconstant resistancemode.
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4.1.2.3ShiftingfromConstantResistance toConstantVoltageMode
I
U
I
U
Diagram4.6ShiftingfromConstant ResistancetoConstantVoltageMode
Byshiftingfromconstantresistanceintoconstantvoltagemode,the powersupplyundertestcan
avoiddamagefromacurrent strike..
Fromthe standardconstantcurrentmode,press the Shift+5(CR+CV) keystoentertheconstant
currentshiftingtoconstantvoltagemode.When theVFDdisplayshows CR TOCVVOLT=xxxxxxxxV it
indicatesthe currentconstantvoltagevalue thatisset. Press the numerickeysand decimalpointkeyto
enterthe constantvoltagevalue desired,and press the Enter keytoconfirmthe setting.Inthismode,the
load will shiftfromthe constant resistancetotheconstant voltageset.
Ifthe inputstateisOFF ,thentheupperrightcornerofthe VFDdisplaywill show OFF.Press the
On/Off keytochangethe inputstateto ON.Thenthe upperrightcornerofthe VFDdisplaywill showeither
CR+CV or Unreg. CR+CV meanstheloadhasbeen successfullysetwiththe selected constantresistance
value; Unreg meanstheDC Loadcouldnotacceptthe inputconstantresistancevalue. Pleasecheck that
the powersupplyundertesthasbeencorrectlyconnected and turned on; makesurevoltageisnormal.
Pressingthe Shift+5(CR+CV)keysinsequencewhileinthe loadingandunloadingconstant
resistancemode,will placethe DC Load back intothe standardconstant resistancemode.
4.1.3ConstantVoltageOperationMode(CV)
Inthismode,theDC ElectronicLoad will attempttogeneratesufficientcurrentandsynchronizetothe
sourcevoltageofthe unitundertestwiththe programmed value.PleaserefertotheDiagramat4.7.Note:
When the voltageofthe powersupplyundertestisless than the voltagevalue set, orthe inputcurrentis
beyondthemaximumcurrent thattheDC load canwithstand,theloadwillbeunabletosynchronizetothe
voltagevalue set.
V
I
Loadinput
Voltage
Loadcurrent
Volt Set
V
I
Loadinput
Voltage
Loadcurrent
Volt Set
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