UNI-T UT81B Spécifications Page 1

Model UT81BOPERATING MANUAL

9Model UT81B: OPERATING MANUALshock or damages to the Meter.The rotary switch should be placed in the rightposition and no any changeover of range sha

10Model UT81B: OPERATING MANUALInternational Electrical SymbolsAC or DCDC MeasurementAC MeasurementContinuity TestDiodeGroundingDouble InsulatedWarnin

11Model UT81B: OPERATING MANUALChapter 2Using the Testing ToolReading the ScreenDescriptionThe degree of contrastSleep mode timeDisplay backlightBeepe

12Model UT81B: OPERATING MANUALFigure 2-1. Meter StructureThe Meter StructureThe Figure 2-1 shows the Meter structure.1. USB Terminals2. LCD Display

13Model UT81B: OPERATING MANUALFigure 2-2. Functional ButtonsTable 2-2. Functional ButtonsDescriptionSoftware functional buttons, detailsplease refer

14Model UT81B: OPERATING MANUALTable 2-2. Functional ButtonsButtonsModeSetSave/CallHoldDescriptionTo switch between waveform display(scope mode) and d

15Model UT81B: OPERATING MANUALChapter 3Making MeasurementIntroductionChapter 3 explains how to make measurements.You could turn the Meter off by turn

16Model UT81B: OPERATING MANUALF2: Set the Display BacklightBK Light 15 ENTERF1 F2 F3 F4Th

17Model UT81B: OPERATING MANUALFigure 3-1. Waveform DisplayTurn the rotary switch to ACV, DCV, Hz, ACA or DCArange, the Meter displays digital reading

18Model UT81B: OPERATING MANUALl Y-axis adjustment: Press Range button under scopemode, the corresponding functional button:Move Move

Chapter Title Page66788101111121315151517191920202227293133Model UT81B: OP

19Model UT81B: OPERATING MANUALPress Trig button under scope mode, thecorresponding function buttons:Trig Trig Auto/Norm/Shot Slop Rrise/

20Model UT81B: OPERATING MANUALbe returned to working mode to carry out measurement.In order to have more accurate waveform, user canbuy an optional B

21Model UT81B: OPERATING MANUALFigure 3-2. Voltages MeasurementWhen measuring voltage, the corresponding functionalbuttonsAC / DC REL Rang

22Model UT81B: OPERATING MANUALIf the fuse burns out during measurement, the Metermay be damaged or the operator himself may behurt.To avoid possible

23Model UT81B: OPERATING MANUALFigure 3-3. µA Range MeasurementlTo measure ACµA or DCµA currents, set up theMeter as Figure 3-3 and proceed as follows

24Model UT81B: OPERATING MANUALFigure 3-4. mA Range MeasurementlTo measure ACmA or DcmA currents, set up theMeter as Figure 3-4 and proceed as follow

25Model UT81B: OPERATING MANUALFigure 3-5. 10A Range MeasurementlTo measure AC 10A or DC 10A currents, set upthe Meter as Figure 3-5 and proceed as fo

26Model UT81B: OPERATING MANUALNoteWhen measuring current, the corresponding functionalbuttons:AC / DC REL Rang Rang F1

27Model UT81B: OPERATING MANUALFigure 3-6. Resistance MeasurementWarningTo avoid possible damages to the Meter or to thedevices under test, disconnect

28Model UT81B: OPERATING MANUALΩNote1. Insert the red test lead into the Ω terminal and the black test lead into the COM terminal.2. Set the rotary

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29Model UT81B: OPERATING MANUALFigure 3-7. Diode TestTo avoid harms to you, please do not attempt toinput voltages higher than 60V DC or 42V rms AC.To

30Model UT81B: OPERATING MANUALΩNote1. Insert the red test lead into the Ω terminal and the black test lead into the COM terminal.2. Set the rotary

31Model UT81B: OPERATING MANUALFigure 3-8. Continuity TestTo avoid harms to you, please do not attempt toinput voltage higher than 60V DC or 42V rms A

32Model UT81B: OPERATING MANUALΩNote1. Insert the red test lead into the W terminal and the black test lead into the COM terminal.2. Set the rotary

33Model UT81B: OPERATING MANUALFigure 3-9. Measuring Frequency / Duty CycleTo avoid harms to you, please do not attempt toinput voltage higher than 42

34Model UT81B: OPERATING MANUALNoteThe requirement of Input amplitude “a” is as follows:When 1MHz: 300 mV a 30Vrms;1MHz: 600 mV a 5VrmsIt i

35Model UT81B: OPERATING MANUALFigure 3-10. Measuring CapacitanceTo ensure accuracy, the Meter inside is dischargedagainst the tested capacitorTo avoi

36Model UT81B: OPERATING MANUALCapacitors larger than 10 F take longer time.If the tested capacitor has polarity, connect the redtest lead to positive

37Model UT81B: OPERATING MANUALChapter 4Using SoftwareWhen using the Software, please refer to the Installation Guide of the included CD-ROM.

38Model UT81B: OPERATING MANUALChapter 5 Maintaining The Test ToolThis chapter provides basic maintenance informationincluding battery and fuse repla

3Model UT81B: OPERATING MANUAL5051Chapter Title PageTable of Contents

39Model UT81B: OPERATING MANUAL1.Remove the battery compartment2.Remove the case bottom3.Install fuses with correct type and specificationFigu

40Model UT81B: OPERATING MANUALFigure 5-2. Battery ReplacementC. Replacing the BatteryWarningTo avoid false readings, which could lead to possibleel

41Model UT81B: OPERATING MANUALChapter 6SpecificationsSafety and CompliancesRefer to different range input protection voltageIEC 61010 CAT. II 1000V,

42Model UT81B: OPERATING MANUALPhysical SpecificationsDigital: 3999 counts on display ; updates 2-3 times / second.0oC~40oC (32oF~104oF)-10oC~50oC (14

43Model UT81B: OPERATING MANUALGeneral Specifications ( Digital Multimeter)When it is under Multimeter mode, you could select either auto ormanual ran

44Model UT81B: OPERATING MANUALFeature Summary160 x 160 MonochromeWhen it is under multimeter mode, the Meter automatically selectsbest rangeBeeper so

45Model UT81B: OPERATING MANUALBasic Specifications (Scope)Sampling rateSampling rate / ScaleUpdating rateTrigger typesTimebase RangeTimebase accuracy

46Model UT81B: OPERATING MANUALA. DC Voltage400mV4V40V400V1000VRange Resolution Accuracy Overload Protectio

47Model UT81B: OPERATING MANUALl The specification is same as Bi Under Multimeter mode.l On the top right corner of the display shows the accuracy of

48Model UT81B: OPERATING MANUALD. AC Current0.5A, 250V, fast type fuse, ø5×20mm10A, 250V, fast type fuse, ø5×20mm(Continuous measurement 10 secondsan

4Model UT81B: OPERATING MANUAL7101113Table Title PageList of Tables1-1 Unp

49Model UT81B: OPERATING MANUALl The specification is same as Di Under Multimeter mode. On the top right corner of the display shows the accuracy

50Model UT81B: OPERATING MANUALRange Resolution Overload Protection RemarksG. Continuity Test Testl The

51Model UT81B: OPERATING MANUALl The specification is same as Hi. Under Multimeter mode, press RANGE button to toggle between frequency and duty cy

52Model UT81B: OPERATING MANUALThis operating manual is subject to change without notice.** END **

53Model UT81B: OPERATING MANUALCopyright 2006 Uni-Trend Group Limited.All rights reserved.Manufacturer:Uni-Trend Technology (Dongguan) LimitedDong Fan

54Model UT81B: OPERATING MANUAL

5Model UT81B: OPERATING MANUAL1213172123242527293133353940Figure Title PageList

6Model UT81B: OPERATING MANUALOverviewThis Operating Manual covers information on safetyand cautions. Please read the relevant informationcarefully an

7Item Description QtyModel UT81B: OPERATING MANUALUnpacking InspectionOpen the package case and take out the Meter. Check the items shown on Table 1-1

8Model UT81B: OPERATING MANUALSafety InformationThis Meter complies with the standards IEC61010 safetymeasurement requirement: in pollution degree 2,o