Product Name: USB 5V 9V 12V 20V QC 2.0 3.0 OLED Current Voltage Charger Capacity Tester USB Charger Doctor Power Meter Text Voltmeter Model NO.: SL557 Customized: Customized AC Voltmeter Type: Electrostatic DC Voltmeter Type: Electrostatic Power Source: AC and DC Theory: Electric Apparatus Usage: Voltage / Current Display: Digital Installation: General Installation Meter Accuracy Class: Plus or Minus 1% Measuring Range: 5V~20V Trademark: OEM/ ODM Transport Package: OPP Bag Specification: 68mm x 23mm x 12mm Origin: Shenzhen, China Mainland Product Description USB 5V 9V 12V 20V QC 2.0 3.0 OLED Current Voltage Charger Capacity Tester USB Charger Doctor Power Meter Text Voltmeter;Description:•ThistestcanbeaUSBchargingcurrent,voltage,dischargecapacity,Quantityofelectriccharge,power,timing,intelligentdevices.• Itcanbeveryeasytofinddigitaldevicechargingproblem.• Testerthreedimensionalsize60*24*14mm • Theonlybuttononthetesterisusedtoviewandtestdataswitch,Thetestercanbepowereddowntosavedata.Specifications:1.InputVoltage:3V-30V2.Inputcurrent:0-5.1A3.Cumulativecapacityrange:0-99999mahprecision:0.001Ah4.Chargeaccumulationscope:0-999999MWHprecision:0.001Wh5.Cumulativepowerrange:0-299.999Wprecision:0.001W6.Timingthemaximumrange:0-999hours59minute59secondsprecision:1second7.Parametersthatyoucantest:Voltageofbattery.Currentofbattery,dischargecapacityofbattery,Quantityofelectriccharge,powerofbattery,timing.8.Communicationfunction:Yes9.Parametersadjustingfunction:Yes.Equipmentforparametersadjustment:Oneelectronicload,oneconstantcurrent source.Voltageofconstantcurrentsourceshouldbesetto8.5VThereare3A,2A,1Aand0.3Amodelsforcurrentadjusting.Hereisaexamplefor3A:Whenyousetelectronicloadat3Amodel,thecurrentwillbeadjustedstepby step.Itwillcostyouabout10secondsandyoucanseetheresultchangingprocedureintheLCDscreen.Whenyouseethe3AresultshowninLCDscreen,the adjustmentprocessisfinished.Youcanshutofftheelectronicloadandthe parameterswillbesavedautomatically.10.Cleanthedata:Pushthebuttonuntiltheparameterschangedtonextsetsof parameters.Thenreleasethebutton.Thenthenextsetsofparameterswillbestartedandtheywillstartfromzero.11. Overvoltageorundervoltage:Overvoltageorundervoltage,LCDscreendisplaysawarningsymbolandissuerapidbeepbeepsound.12. Turnonmodel:TheLCDscreenwillshowallparameterswithin1swhenyouconnectpowersupplybyMicroUSBormaleplugofUSBwithwire.(ItistocheckwhethertheLCDscreen isgoodornot).Thenyoucanseetheparametersusedlasttime(capacitorand whichsetofparameters).Youalsocanseethecurrentvoltage,currentandover voltageorundervoltage.Pleaseseefollowingillustration.USBoutputportcanbeconnectedtoadataline,adischargeresistororthe likecabledeviccomprisingadatacommunicationfunction,thedatadoesnotaffectthedatatransmissionline.Testspecifications,voltagecannotexceed30V,currentcannotexceed5.1A.Note:Whenthevoltageislowerthan3VontheinstrumentdisplayNodisplayscreenorhigherthan22V,LCDscreendisplaysawarningsymbolandissuerapidbeepbeepsound,itdoesnotaffecttheuse.ApplicationexamplesBecausemobilephonesanddigitaldevicesatlowbatteryorfullcharge,the currentandvoltageisnotastablevalue,theapplicationexampleofthedischargedeviceisaUSB1Aor2Adischargeresistor.Note:Thisdataismobilepowerdischargecapacity,thebatterycapacityisnot,accordingtoourexperience,thedischargecapacityisabout1.9timesthebatterycapacity. TheformerTestReferenceManualTesterdischargecapacityvalueiscleared,andthemobilepowerisfullycharged.Packageinclude1xLCDUSBVoltageCurrentDetectorMobilePowerUSBChargerTesterMeter