UNI-T UT33B Manuals

UT33 B/C/D OPERATING MANUAL UNI-T UT33B/C/D Operating Manual Palm Size Digital Multimeter SafetyInformation This Meter complieswith the standards IEC61010: in pollution degree2, overvoltage category(CAT1600V, CAT II 300V)and double insulation, CAT. I: Signal level, special equipment or parts of equipment, telecommunication,electronic, etc., with smaller transient overvoltages than overvoltages CAT. II. CAT. II: Local level, appliance, PORTABLE EOU EHT ele., with smallertransient overvoltages than CAT. IU Usethe Meter only as specified in this opera' otherwise the protection provided by the e Sf impaired. In this manual, a Waming identifiesconditions and aclioos pose hazards to the user, or may damage the er or equipment under test.A Note identifies theinfonnation Ihal user should payattentionon. Intemational electrical symbols used onthe Meter andin this Operating Manualareexplainedonpege 10. RulesFor SafeOperation . Waming Toavoidpossibleelectric shockor persona • to avoid possible damage to the Meter or to the equipme undertest, adhere to thefollowingrules: • Before using theMeter inspectthecase. Donot usethe Meter if it is damaged or the case(or part of the case) is removed. Lookfor cracksor missing plastic.Payattention to the insulation around theconnectors. • Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged test leadswith identical model number or electrical specifications beforeusing the Meter. • Donotapplymorethanthe ratedvoltage. as marlted on the Meter, between the terminals or between any terminal andgrounding, • Therotaryswitch should beplacedin the right position and no any changeover of range shall be made during measurement is conducted to prevent damage of the Meter. • WhentheMeterworlting at aneffectivevoltageover 60V in DCor 42Vrms in AC, special care should be takenfor thereis dangerof electricshock. • Usethe properterminals, function, and rangefor your measurements. • Do not use or store the Meter in an environment of high temperature, humidity, explosive, inflammable and strong magnetic field.The performance of the Metermay deteriorateafterdampened. • When using thetest leads, keepyourfingersbehind the fingerguards. • Disconnect circuit poweranddischargeall high-voltage capacitors before testing resistance, continuity, diodes andcurrent. • Before measuring current, checkthe Meter's fuses and tum off powerto thecircuit beforeconnecting the Meterto the circuit. • Replace the battery as soon as the battery indicator appears.Witha low battery, the Meter might produce false readings that can lead to electric shock and personal injury. • Remove test leads and temperature probe from the Meter and turn the Meter power off before opening the Metercase, • When servicing the Meter, use only the samemodel numberor identical electricalspecificationsreplacement parts, • Theinternal circuit of the Metershall not be attered at will to avoiddamage of theMeterandany acelde • Soft cloth and mild detergent should be used to de the surface of the Meter when servicing. No abrasM! and solventshould beusedto preventthe surfaceof the Meter from corrosion,damage andaccident. • The eteris suitablefor indoor use. • Tum the Meteroff when it is not in use and take out the battery whennot using for a long time. • Constantly check thebattery as it mayleakwhenit hasbeen using for sometime, replacethe battery as soon as leaking appears. A leaking battery will damage the Meter. ~ - ACorOC ~ LowBattery ACCurrent -+I- Diode ocCurrent - Fuse • Ear.h Ground >'1) ContinuityTest a llotilIeInsulated l!> Safety Ruless cs Con/orms toStandards of EuNV an Union The eter Structure(figure 1) 1) 2) 6 3) DisDIav Bad Warning To avoid harms to you or damages to the Meter from electricshock, pleasedo not attempt to measurevoltages higherthan500V although readings may beobtained. TheDCVoltage ranges are: 200mV, 2000mV, 20V,200V andsoev To measmlOC •connecttheMeter asfollows: 1. Insert the red testleadinto theVQmAterminal and theblack testlead intotheCOM . 2. Settherotaryswtchkl anappropriate measurement position inV::= range. 3.Connect theIeslleadsacross the objectbeing measured. Themeasured :.ows on display. beobtained. ValIagl' lIl!aSlJrement (see figure 2) ..,oId hanm to you or damages to the Meter from electricshock, TheAC valage are: 200V andSOOV. Tomeasure AC~ ' connect the eterasfoIows: 1. lnsert theredtestleadinto the VQmA terminal and theblacktest lead intotheCOMterminal. 2. Settherotaryswitch toanappropriatemeasurementpositioninV­ range. 3. Connectthetestleadsacrosswith theobjectbeing measured. Themeasured value showson thedisplay, whichiseffective value of sine wave (mean valueresponse). Note • If the value of voltage to be measured is unknown, use the maximum measurement position (500V) andreduce the range stepbystepuntil a satisfactory reading isobtained. • TheLCD displays "1"indicating theexisting selected range is overload, it is required toselect ahigherrangeinorder toobtaina correct reading . • In each range, the Meter has an input impedance of approx. 10MQ. Thisloading effect can cause measurement errors inhigh impedancecircuits.Ifthecircuitimpedance islessthan orequal to 1OkQ, theerrorisnegligible (0.1%orless). • When AC vollage measurement has been completed, disconnect the connection between the testingleadsand the circuitunder tesl. C. DCCurrentMeasurement (seefigure 3) Figure 3 . Warning Neverattemptan in-circuit current measurement wherethe voltage betweenterminals and ground is greaterthan 60V. If the fuse burns out during measurement,the Meter may be damaged or the operator himself may be hurt. Use proper terminals,function,and rangefor the measurement.Whenthe testing leadsareconnectedto the current terminals, do not parallel themacross anycircuit. TheModel UT33B: thecurrent measurement has3 measurement positions onthe rotary switch: 200!,A, 200mAandl OA. The Model UT33CIUT33D: the current measurement has 4 measurementpositionson the rotary switch: 2000,uA, 20mA, 200mAand10A Tomeasure current, dothefollowing: 1. Turn off powerto the circuit. Discharge all high-voltage capacitors. 2. Insert thered lestlead into theVQmAor lOAterminal andthe black testleadintotheCOMterminal. 3.-set the rotaryswitchto anappropriate measurement positionin A:= range. 4. Brea currentpathtobetested.Connectthered test lead to the more p Warning To avoid damages to the Meteror to the devices undertest, disconnectcircuit power and dischargeall the high-voltage capacitors before measuring resistance. ­ The Model UT33B/UT33C: The resistance measurement positions are: 200Q, 2000Q,20kQ, 200kQ and20MQ. TheModelUT33D: Theresistance measurement positionsare: 200Q, 2000Q, 20kQ, 200kQ,20MQ and 200MQ Tomeasureresistance, connecttheMeter as follows: 1. Insert the red test lead intotheVQmA terminal and theblack testlead intotheCOM terminal. 2.Settherotary switch toanappropriate measurementpositionin Q range. 3. Connect thetestleads across withtheobjectbeingmeasured. The measured value shows onthedisplay. Note • The test leadscanadd 0.1Q to 0.3Q of errorto resistance eas rement. Toobtainprecision readings in low-resistance measurement. that is the range of 200Q.short-circuit the input terminals beforehandandrecord thereading obtained(called this readinaasXl. (Xl Is theadditional resistance from thetestlead.

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Page 3 4 5 7 10 11 12 13 13 15 17 20 22 25 27 Title Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter structure Functional Buttons Measurement Operation A. DC Voltage Measurement B. AC Voltage Measurement C. DC Current Measurement D. Measuring Resistance E. Diodes and Continuity Measurement F. Temperature Measurement G. Battery Test Table of Contents (1) 1 Model UT33B/C/D: OPERATING MANUAL