Model UT71A/BOPERATING MANUAL

8Model UT71A/B: OPERATING MANUALllllllllllllllWhen the Meter working at an effective voltage over60V in DC or 30V rms in AC, special care should betak

9Model UT71A/B: OPERATING MANUALInternational Electrical SymbolsSymbols used on the Meter and in this manual are explained in Table1-2.Table 1-2. Inte

10Model UT71A/B: OPERATING MANUALChapter 2Getting AcquaintedTurning the Meter OnTo turn the Meter on, turn the rotary switch from OFFto any switch set

11Model UT71A/B: OPERATING MANUALLow Battery IndicationA constant battery icon ( ) in the upper left cornerof the display notifies you that the

12Model UT71A/B: OPERATING MANUALRotary SwitchTurn the Meter on by selecting any measurement function. The Meter presents a standard display for that

13Model UT71A/B: OPERATING MANUALTable 2-1. Rotary Switch SelectionsRotarySwitch PositionRotary Switch Function Blue Key FunctionResistance measuremen

14Model UT71A/B: OPERATING MANUALFunctional ButtonsThe buttons activate features that augment the function selected with the rotary switch. The butto

15Model UT71A/B: OPERATING MANUALTable 2-2. Functional ButtonsButton Description Access MethodRANGESETUPSENDPress the button once.Press and hold the

16Model UT71A/B: OPERATING MANUALTable 2-2. Functional ButtonsButton Description Access MethodSENDHOLDPeak HOLDPress the buttononce after entering Se

Model UT71A/B: OPERATING MANUAL17Table 2-2. Functional ButtonsButton Description Access MethodEXITLIGHTPress the button once after enteringSetup or R

Model UT71A/B: OPERATING MANUALMAXMINTable 2-2. Functional ButtonsButton Description Access Method18Press the button once.Press the button once after

Model UT71A/B: OPERATING MANUALRELAC+DCTable 2-2. Functional ButtonsButton Description Access Method19Press the button once.Press and hold the button

Model UT71A/B: OPERATING MANUAL20Blue ButtonButton Description Access MethodUse the blue button to select any rotary switch alternatefunction (labeled

21Model UT71A/B: OPERATING MANUALThe Meter Functions Vs DisplaysTable 2-3 shows the cross reference of function and display:Table 2-3 Functions Vs Dis

22Model UT71A/B: OPERATING MANUALTable 2-3 Functions Vs DisplaysFunction Primary Display Right Secondary Display Left Secondary DisplayThe tested ACµA

23Model UT71A/B: OPERATING MANUALTable 2-3 Functions Vs DisplaysFunction Primary Display Right Secondary Display Left Secondary DisplayRCLMAX MINRELTh

24Model UT71A/B: OPERATING MANUALSelecting the RangePress RANGE to select either a fixed range or theautorange feature.Autoranging (AUTO lighted in th

25Model UT71A/B: OPERATING MANUALTable 2-4. Display FeaturesNo. Symbol Meaning1234567MAXMINAVGNoHµmSSETMaximum reading displayed.Minimum reading displ

26Model UT71A/B: OPERATING MANUALTable 2-4. Display FeaturesNo. Symbol Meaning8910TrueRMSAC+DC, k , MHz, kHz, MHzmV, VµA, mA, AIndicator for True RMS

27Model UT71A/B: OPERATING MANUALTable 2-4. Display FeaturesNo. Symbol Meaning1011121314151617nF,µF,mFLOWHIGHAUTOSENDFarad. The unit of capacitancenF:

CHAPTER TITLE PAGEModel UT71A/B: OPERATING MANUAL1TABL

28Model UT71A/B: OPERATING MANUALTable 2-4. Display FeaturesNo. Symbol Meaning18192021222324HOLDPEAK HOLD% OLAnalogue Bar GraphBacklight feature is

29Model UT71A/B: OPERATING MANUALAnalogue Bar GraphThe bar graph provides an analogue indication of themeasured input. For most measurement functions

30Model UT71A/B: OPERATING MANUALChapter 3Making MeasurementIntroductionChapter 3 explains how to make measurements. Mostmeasurement functions can be

31Model UT71A/B: OPERATING MANUALTo measure voltages, set up the Meter as Figure 3-1and do the following:Insert the red test lead into the V terminal

32Model UT71A/B: OPERATING MANUALB. Measuring CurrentsWarningIf the fuse burns out during measurement, the Metermay be damaged or the operator himself

33Model UT71A/B: OPERATING MANUALDC measurement is default, press blue button toselect AC measurement.Open the circuit path to be tested. Touch the r

34Model UT71A/B: OPERATING MANUALC. Measuring ResistanceFigure 3-3. Resistance MeasurementWarningTo avoid harms to you, please do not attempt to input

35Model UT71A/B: OPERATING MANUALD. Testing for ContinuityWarningTo avoid harms to you, please do not attempt to inputvoltage higher than 60V DC or 30

36Model UT71A/B: OPERATING MANUALFigure 3-4. Continuity TestNoteOpen circuit voltage around –1.2V and range is 400measurement range.When continuity te

37Model UT71A/B: OPERATING MANUALE. Testing DiodesFigure 3-5. Diode TestWarningTo avoid harms to you, please do not attempt to inputvoltages higher th

2Model UT71A/B: OPERATING MANUAL3.4.CHAPTER TITLE PAGE

38Model UT71A/B: OPERATING MANUAL3.The BLUE button cycles among resistance, continuity,and diode.For forward voltage drop readings on any semiconducto

39Model UT71A/B: OPERATING MANUALF. Measuring CapacitanceFigure 3-6. Capacitance MeasurementWarningTo ensure accuracy, the Meter inside is dischargeda

40Model UT71A/B: OPERATING MANUAL2.3.Set the rotary switch to measurement mode,the Meter may display a fixed reading which is ainternal distrib

G. Measuring Frequency / Duty CycleFigure 3-7. Frequency / Duty Cycle Measurement41Model UT71A/B: OPERATING MANUALWarningTo avoid harms to you, please

42Model UT71A/B: OPERATING MANUALNoteThe requirement of Input amplitude “a” is as follows:When 10Hz~40MHz: 200 mV a 30Vrms; >40MHz: Un-speci

43Model UT71A/B: OPERATING MANUALH. Measuring Temperature (UT71B only)WarningTo avoid harms to you, please do not attempt to inputvoltages higher than

44Model UT71A/B: OPERATING MANUAL2.3.Set the rotary switch to , and press BLUEbutton to select (4~20mA)% feature.1.The rest procedure, p

45Model UT71A/B: OPERATING MANUALPress STORE once, STO and “no.xxxx” appears toconfirm the operation and the left secondary displayshows the current m

46Model UT71A/B: OPERATING MANUALPress RECALL to recall the stored value and RCLappears to confirm the operation.The left secondary display shows the

47Model UT71A/B: OPERATING MANUALChapter 5Changing the Default SettingIntroductionThe Meter allows you to change the default operating configuration o

3Model UT71A/B: OPERATING MANUAL5.6.7.CHAPTER TITLE PA

48Model UT71A/B: OPERATING MANUALTable 5-1. Setup SelectionsSelection Option Factory Default DescriptionMax. 40000; Press to select OFFPress

49Model UT71A/B: OPERATING MANUALTable 5-1. Setup SelectionsSelection Option Factory Default DescriptionZero is in the left hand side.Zero is in the c

50Model UT71A/B: OPERATING MANUALWarningDo not attempt to repair or service your Meter unless you are qualified to do so and have the relevantcalibrat

51Model UT71A/B: OPERATING MANUALWarningTo avoid electrical shock or arc blast, or personalinjury or damage to the Meter, use specified fusesONLY in a

52Model UT71A/B: OPERATING MANUALWarningTo avoid false readings, which could lead to possibleelectric shock or personal injury, replace the batteryas

53Model UT71A/B: OPERATING MANUALChapter 7SpecificationsSafety and CompliancesMaximum Voltage between any Terminal and GroundingCertificationComplianc

54Model UT71A/B: OPERATING MANUALllPhysical SpecificationsDisplay (LCD)Operating TemperatureStorage TemperatureRelative HumidityBattery TypeElectromag

55Model UT71A/B: OPERATING MANUALGeneral SpecificationsRangePolarityOverloadingBattery DeficiencyAutoAutoDisplay OL(For UT71B only: except at 4~20mA L

56Model UT71A/B: OPERATING MANUALFeature SummaryTri Digital DisplaysAnalogue Bar GraphBacklight with 2 brightness levelsAutorangeAC+DC True RMS, AC RM

57Model UT71A/B: OPERATING MANUALBasic SpecificationsDC VoltageAC Voltage, True RMSBasic AccuracyDC CurrentAC Current, True RMSResistanceCapacitanceFr

4Model UT71A/B: OPERATING MANUALCHAPTER TITLE PAGE6263

58Model UT71A/B: OPERATING MANUALA. DC VoltageRange ResolutionAccuracyOverload Protection200mV2V20V200V1000V1000VInput ImpedanceAround 2.5GAround 10M(

59Model UT71A/B: OPERATING MANUALRange Resolution2V20V200V1000VBandwidthAccuracyUT71A UT71BInput ImpedanceApprox 10MB. AC Voltage (AC+DC measurement i

60Model UT71A/B: OPERATING MANUALRemarks:llOverload Protection: 1000V.Display:a) True rms are valid from 10% of range to 100% of rangeb) AC crest fact

61Model UT71A/B: OPERATING MANUALRemarks:llWhen the measured current is 5A, continuous measurement is allowed.When the measured current is between 5

62Model UT71A/B: OPERATING MANUALRemarks:llDisplay:a) True rms are valid from 10% of range to 100% of rangeb) AC crest factor can be up to 3.0.c) A re

63Model UT71A/B: OPERATING MANUALRange ResolutionAccuracy2002k20k200k2M20MOverload ProtectionUT71A UT71BRange Resolution Overload ProtectionRemarks:ll

64Model UT71A/B: OPERATING MANUALRange Resolution Overload ProtectionRemarks:llOpen circuit voltage approximate 2.8V.A good silicon junction drops bet

65Model UT71A/B: OPERATING MANUALRemarks:lInput amplitude “a” as follows; (DC electric level is zero)When 10Hz~40MHz : 200mV a 30Vrms;When > 40

66Model UT71A/B: OPERATING MANUALJ. Temperature (UT71B only)Range Resolution Accuracy Overload Protection1000V(3%+30)(1%+30)2.5%0.1ºC-40ºF~32ºF32ºF~75

67Model UT71A/B: OPERATING MANUALK. 4~20 mA loop current (UT71B only)Range Resolution Accuracy Overload Protection(4~20mA)% 0.5A, 250V, fast type fuse

5Model UT71A/B: OPERATING MANUALChapter 1Before You StartOverviewThis Operating Manual covers information on safety and cautions. Please read the rele

68Model UT71A/B: OPERATING MANUALThis operating manual is subject to change without notice.Copyright 2005 Uni-Trend Group Limited.All rights reserved.

6Model UT71A/B: OPERATING MANUALUnpacking InspectionOpen the package case and take out the Meter. Check the items shown on Table 1-1 carefully to see

7Model UT71A/B: OPERATING MANUALSafety InformationThis Meter complies with the standards IEC61010 safetymeasurement requirement: in pollution degree 2