Uni-Trend UT33B multimeter
Contents
1. HOLD once to enter hold mode HOLD button Press HOLD again to exit hold mode In Hold mode lil is displayed and the present value is shown Press BLUE button once to turn the display backlight on Press BLUE button again to turn the display backlight off Display backlight will NOT be automatically off unless pressing the BLUE button BLUE button 12 Model UT33B C D OPERATING MANUAL Measurement Operation 1 A DC Voltage Measurement see figure 2 ZA warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 500V although readings may be obtained The DC Voltage ranges 200mV 2000mV 20V 200V and 500V To measure DC voltage connect the Meter as follows 1 Insert the red test lead into theVOmAterminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in Viirange 3 Connectthe test leads across with the object being measured The measured value shows on the display figure 2 13 Model UT33B C D OPERATING MANUAL Measurement Operation 2 Note Ifthe value of voltage to be measured is unknown use the maximum measurement position 500V and reduce the range step by step until a satisfactory reading is obtained The LCD displays 1 indicating the existing selected range is overload it is required to select a higher range in order to2. obtain a correct reading In each range the Meter has an input impedance of approx 10M2 This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kQ the error is negligible 0 196 or less When DC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test 14 Model UT33B C D OPERATING MANUAL Measurement Operation 3 B AC Voltage Measurement see figure 2 ZA warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 500Vrms although readings may be obtained The AC voltage measurement positions are 200V and 500V To measure AC Voltage connect the Meter as follows 1 Insert the red test lead into the VOmA terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in V range 3 Connect the test leads across with the object being measured The measured value shows on the display which is effective value of sine wave mean value response 15 Model UT33B C D OPERATING MANUAL Measurement Operation 4 Note Ifthe value of voltage to be measured is unknown use the maximum measurement position 500V and reduce the range step by step until a satistactory reading is obtained The LCD displays 1 indicating the existing selected
3. special equipment or parts of equipment telecommunication electronic etc with smaller transient overvoltages than overvoltages CAT Il CAT II Local level appliance PORTABLE EQUIPMENT etc with smaller transient overvoltages than CAT III Use the Meter only as specified in this operating manual otherwise the protection provided by the Meter may be impaired Model UT33B C D OPERATING MANUAL Safety Information 2 In this manual a Warning identifies conditions and actions that pose hazards to the user or may damage the Meter or the equipment under test A Note identifies the information that user should pay attention on International electrical symbols used on the Meter and in this Operating Manual are explained on page 10 Model UT33B C D OPERATING MANUAL Rules For Safe Operation 1 ZN warning To avoid possible electric shock or personal injury and to avoid possible damage to the Meter or to the equipment under test adhere to the following rules Before using the Meter inspect the case Do not use the Meter if it is damaged or the case or part of the case is removed Look for cracks or missing plastic Pay attention to the insulation around the connectors Inspectthe test leads for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads with identical model number or electrical specifications before using the Meter Do not apply more than the rated vol
4. the same model number or identical electrical specifications replacement parts The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing No abrasive and solvent should be used to prevent the surface of the Meter from corrosion damage and accident The Meter is suitable for indoor use Turn the Meter off when it is not in use and take out the battery when not using for a long time Constantly check the battery as it may leak when it has been using for some time replace the battery as soon as leaking appears A leaking battery will damage the Meter 2h el H FEE Model UT33B C D OPERATING MANUAL International Electrical Symbols AC or DC AC Current DC Current Earth Ground Double Insulated Low Battery Diode Fuse Continuity Test Safety Rules Conforms to Standards of European Union 10 The Meter Structure figure 1 X I LCD Display HOLD Button Display Backlight Button Rotary Switch COM Input Terminal 10A Input Terminal Other Input Terminals Model UT33B C D OPERATING MANUAL The Meter Structure figure 1 11 GO Model UT33B C D OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations Button Operation Performed Press
5. 1 across the junction A good silicon junction drops between 0 5V and 0 8V To test a diode out of a circuit connect the Meter as follows 1 Insert the red test lead into the VOmA terminal and the black test lead into the COM terminal 2 Set the rotary switch to The Model UT33B or 1 The Model UT33C UT33D 3 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode The measured value shows on the display Note In a circuit a good diode should still produce a forward voltage drop reading of 0 5V to 0 8V however the reverse voltage drop reading can vary depending on the resistance of other pathways between the probe tips 23 Model UT33B C D OPERATING MANUAL Measurement Operation 12 Connect the test leads to the proper terminals as said above to avoid error display The LCD will display 1 indicating open circuit for wrong connection The unit of diode is Volt V displaying the positive connection voltage drop value When diode testing has been completed disconnect the connection between the testing leads and the circuit under test The Model UT33C UT33D Testing for Continuity To test for continuity connect the Meter as below 1 Insert the red test lead into the VOmA terminal and the black test lead into the COM terminal 2 Set the rotary switch to 3 Connectthe te
6. A terminal and the black test lead into the COM terminal Set the rotary switch to an appropriate measurement position in range Connect the test leads across with the object being measured The measured value shows on the display Note The test leads can add 0 1Qto 0 3Qof error to resistance measurement To obtain precision readings in low resistance measurement that is the range of 2000 short circuit the input terminals beforehand and record the reading obtained called this reading as X X Is the additional resistance from the test lead Then use the equation measured resistance value Y 4X precision readings of resistance For high resistance measurement gt 1MQ it is normal taking several seconds to obtain a stable reading When resistance measurement has been completed disconnect the connection 21 Model UT33B C D OPERATING MANUAL Measurement Operation 10 between the testing leads and the circuit under test E Diodes and Continuity Measurement see figure 5 Testing Diodes Awarning To avoid amages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before diodes Use the diode test to check diodes transistors and other semiconductor devices The diode test sends a current through the semiconductor junction and then measures the voltage drop figure 5 22 Model UT33B C D OPERATING MANUAL Measurement Operation 1
7. Meter to OFF position when it is not in use and take out the battery when not using for a long time 37 Model UT33B C D OPERATING MANUAL Maintenance 2 Do not store the Meter in a place of humidity high temperature explosive inflammable and strong magnetic field B Replacing the Battery see figure 8 A Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator 2 appears g Screw To replace the battery 1 Disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter figure 8 38 Model UT33B C D OPERATING MANUAL Maintenance 3 2 Turn the Meter to OFF position 3 Remove the screw from case bottom and separate the case bottom from the case top 4 Remove the battery from the battery compartment 5 Replace the battery with a new 9V battery NEDA 1604 or 6F22 or 006P 6 Rejoin the case bottom and case top and reinstall the screw C Replacing the Fuses See figure 8 Warning To avoid electrical shock or arc blast or personal injury or damage to the Meter use specified fuses ONLY in accordance with the following procedure To replace the Meter s fuse 1 Disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the M
8. Model UT33B C D OPERATING MANUAL Table of Contents 1 Title Page Overview as gt 3 Unpacking Inspection 4 Safety Information 5 Rules For Safe Operation 7 International Electrical Symbols 10 The Meter structure 11 Functional Buttons S 12 Measurement Operation ____ 13 A DC Voltage Measurement 13 B AC Voltage Measurement 15 C DC Current Measurement 17 D Measuring Resistance 20 E Diodes and Continuity Measurement 22 F Temperature Measurement 25 G Battery Test ss S E 27 1 Model UT33B C D OPERATING MANUAL Table of Contents 2 Title Page H Square Wave Output 28 General Specifications 29 Accuracy Specifications 31 A DC Voltage 31 B ACOurrent 32 C DC Current 2 33 D Resistance sss 34 E Diodes and Continuity Measurement 35 F Temperature 25 35 G Battery Test 36 H Square Wave Output 36 Maintenance 37 A General Service 37 B Replacing the Battery 38 C Replacing the Fuses 39 2 Model UT33B C D OPERATING MANUAL O
9. V 0 5 2 20V 10mV 500V DC or AC 200V 100mV 500V 1V 0 8 2 Remark Input impedance 10MQ 31 Model UT33B C D OPERATING MANUAL Accuracy Specifications 2 B AC Voltage _ Overload Range Resolution Urs3g Ura3c UT33D Protection 200V 100mV 1 296410 500V DC or AC 500V 1V Remarks Input impedance approx 5MQ Displays effective value of sine wave mean value response Frequency response 40Hz 400Hz 32 Model UT33B C D OPERATING MANUAL Accuracy Specifications 3 C DC Current sali Overload esolution UT33B UT33C Protection 1 2 315mA 250V fast type fuse were 1 2 5x20mm 200mA 1 2 2 10 2 5 Un Fused Remark At 10 Range For continuous measurement lt 10 seconds and interval not less than 15 minutes 33 D Resistance Accuracy Specifications 4 Model UT33B C D OPERATING MANUAL Accuracy Overload Range Resolution UT33B UT33C UT33D Protection 2000 0 10 0 8 5 20000 19 20kQ 100 0 8 2 c DS 200kQ 1000 20MQ 10kQ 1 5 200 0 100kQ E 5 reading 10 10 34 Model UT33B C D OPERATING MANUAL Accuracy Specifications 5 E Diodes and Continuity Measurement Continuity test only for UT33C UT33D Range Resolution Remark Overload Protection Displays approxim
10. ate forward amy voltage drop 0 5V 0 8V Buzzer beeps at 700 250V DC or AC Remark Overload Protection 40 150 o 19543 150 C 1000 C 1 5 15 250V DC or AC 40 302 1 0 F 302 F TF 1 4 302 F 1832 F 1 5 15 35 Accuracy Specifications 6 G The Model UT33B Battery Test Range Resolution Internal Resistance 12V 10mV 2400 9V 10mV 1 8kQ 1 5V 10mV 300 H The Model UT33D Square Wave Output Range Illustration lr OUT Approx output 50Hz square wave signal As a simple signal source with 47kQ resistance output Remark No overload protection Make sure voltage output of calibrated equipment level is less than 10V to avoid damages to the meter ss Model UT33B C D OPERATING MANUAL Maintenance 1 This section provides basic maintenance information including battery and fuse replacement instruction N warning Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration performance test and service information To avoid electrical shock or damage to the Meter do not get water inside the case A General Service Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings Tum the
11. between the testing leads and the circuit under test 26 Model UT33B C D OPERATING MANUAL Measurement Operation 15 G The Model UT33B Battery Test see figure 7 A warning To avoid harms to you or damages to the Meter please do not attempt to input voltages higher than 60V in DC or 30V in AC To test the battery proceed as follows 1 Insert the red test into the VOmA terminal and the black test leads into the COM terminal 2 Setthe rotary switch to an appropriate measurement position in range 3 Connectthe test leads across with the battery being measured ensuring the polarity is correct The measured value shows on the display which is the voltage between the cathode and anode of the battery figure 7 27 Model UT33B C D OPERATING MANUAL Measurement Operation 16 Note When battery testing has been completed disconnect the connection between the testing leads and the circuit under test H The Model UT33D Square Wave Output ZN warning To avoid damages to the Meter do not allow output terminals red test lead to reach higher than 10V To measure square wave output proceed as follows 1 Set the rotary switch to lr OUT 2 The square wave signal outputs between VOmA and COM Terminals Note The frequency is approx 50Hz The output scope higher than 3Vpp when it is loaded 1MQ 28 Model UT33B C D OPERATING MANUAL General Specifications 1 When square wave out
12. eter 2 Turn the Meter to OFF position 39 Model UT33B C D OPERATING MANUAL Maintenance 4 3 Remove the screw from case bottom and separate the case bottom from the case top 4 Remove the fuse by gently prying one end loose and then take out the fuse from its bracket 5 Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket 315mA 250V fast type 0 5x20mm 6 Rejoin the case bottom and case top and reinstall the screw Replacement of the fuses is seldom required Burning of a fuse always results from improper operation END 40 Model UT33B C D OPERATING MANUAL 41 Copyright 2002 Uni Trend Group Limited All rights reserved Manufacturer Uni Trend Technology Dongguan Limited Dong Fang Da Dao Model UT33B C D OPERATING MANUAL Bei Shan Dong Fang Industrial Development District Hu Men Town Dongguan City Guang Dong Province China Postal Code 523 925 Headquarters Uni Trend Group Limited Rm901 9 F Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon Hong Kong Tel 852 2950 9168 Fax 852 2950 9303 Email info uni trend com http www uni trend com 42
13. he red test lead into the VOmA or 10A terminal and the black test lead into the COM terminal Set the rotary switch to an appropriate measurement position in range Break the current path to be tested Connect the red test lead to the more positive side of the break and the black test lead to the more negative side of the break Turn on power to the circuit The measured value shows on the display 18 Model UT33B C D OPERATING MANUAL Measurement Operation 7 Note If the value of current to be measured is unknown use the maximum measurement position 10A andreduce the range step by step until a satisfactory reading is obtained When current measurement has been completed disconnect the connection between the testing leads andthe circuit under test 19 Measurement Operation 8 D Measuring Resistance see figure 4 ZN warning m To avoid damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measuring resistance The Model UT33B UT33C The resistance measurement positions 2000 20000 20kQ 200kQ and 20MQ The Model UT33D The resistance measurement positions are 2000 20000 20kQ 200kQ 20MQ and 200MQ To measure resistance connect the Meter as follows figure 4 20 2 3 Model UT33B C D OPERATING MANUAL Measurement Operation 9 Insert the red test lead into the VOm
14. put testing has been completed disconnect the connection between the testing leads and the circuit under test General Specifications Maximum Voltage including transient overvoltage between any Terminals and Grounding 500V rms A Fused Protection for VOmA Input Terminal 315mA 250V fast type 95x20 mm 10A Terminal Un fused Range Manual ranging Maximum Display Display 1999 Measurement Speed Updates 2 3 times second Temperature Operating 0 C 40 C 32 F 104 F Storage 10 C 50 C 14 F 122 F Relative Humidity lt 75 0 C 30 C lt 50 31 40 C 29 Model UT33B C D OPERATING MANUAL General Specifications 2 Altitude Operating 2000 m Storage 10000 m Battery Type One piece of 9V Battery NEDA 1604 or 6F22 or 006P Battery Deficiency Display E3 Negative reading Display Overloading Display 1 Dimensions HxWxL 130 x 73 5 x 35mm Weight Approx 156g battery included Safety Compliances IEC61010 600V overvoltage and double insulation standard Certification C 30 Model UT33B C D OPERATING MANUAL Accuracy Specifications 1 Accuracy a reading b digits guarantee for 1 year Operating temperature 23 C 5 C Relative humidity 7596 Temperature coefficient 0 1 x specified accuracy 1 C A DC Voltage Overload Range Resolution T5535 UT33C UT33D Protection 200mV 100uV 250V DC or AC 2000mV im
15. range is overload it is required to select a higher range in order to obtain a correct reading In each range the Meter has an input impedance of approx 10MQ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kQ the error is negligible 0 1 or less When AC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test 16 C Current Measurement see figure 3 ZA warning Never attempt an in circuit current measurement where the voltage between terminals and ground is greater than 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 range for the measurement When the testing leads are connected to the current terminals do not parallel them across any circuit 17 Model UT33B C D OPERATING MANUAL Measurement Operation 5 figure 3 Model UT33B C D OPERATING MANUAL Measurement Operation 6 The Model UT33B the current measurement has 3 measurement positions on the rotary switch 200A 200mA and 10A The Model UT33C UT33D the current measurement has 4 measurement positions on the rotary switch 2000uA 20mA 200mA and 10 To measure current do the following 1 2 3 4 9 Turn off power to the circuit Discharge all high voltage capacitors Insert t
16. st leads across with the object being measured The buzzer sounds if the resistance of a circuit under test is less than 700 Note The LCD displays 1 indicating the circuit being tested is open 24 Model UT33B C D OPERATING MANUAL Measurement Operation 13 When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test F Model UT33C Temperature Measurement see figure 6 ZA warning To avoid harms to you or damages to the Meter please do not attempt to input voltages higher than 60V in DC or 30V in AC The Temperature measurement range is 40 C 1000 or 40 F 1832 F To measure temperature connect the Meter as follows 1 Insert the red temperature probe into the VOmaA terminal and the black temperature probe into the COM temperature figure 6 25 Model UT33B C D OPERATING MANUAL Measurement Operation 14 2 Set the rotary switch to C or F 3 Place the temperature probe to the object being measured The measured value shows on the display Note The Meter automatically displays the temperature value inside the Meter when there is no temperature probe connection The included point contact temperature probe can only be used up to 250 C 482F For any measurement higher than that the rod type temperature probe must be used instead When temperature measurement has been completed disconnect the connection
17. tage as marked on the Meter between the terminals or between any terminal and grounding Therotary switch should be placed in the right position and no any changeover of range shall be made during measurement is conducted to 7 Model UT33B C D OPERATING MANUAL Rules For Safe Operation 2 prevent damage of the Meter When the Meter working at an effective voltage over 60V in DC or 42V rms in AC special care should be taken for there is danger of electric shock Use the proper terminals function and range for 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 Meter may deteriorate after dampened When using the test leads keep your fingers behind the finger guards Disconnect circuit power and discharge all high voltage capacitors before testing resistance continuity diodes and current Before measuring current check the Meter s fuses and turn off power to the circuit before connecting the Meter to the circuit Replace the battery as soon as the battery indicator amp Sgappears With a low battery the Meter might produce false readings that can lead to electric shock and personal injury Model UT33B C D OPERATING MANUAL Rules For Safe Operation 3 Remove test leads and temperature probe from the Meter and turn the Meter power off before opening the Meter case When servicing the Meter use only
18. verview This Operating Manual covers information on safety and cautions Please read the relevant information carefully and observe all the Warnings and Notes strictly ZN warning To avoid electric shock or personal injury read the Safety Information and Rules for Safety Operation carefully before using the Meter The Model UT33B UT33C and UT33D Multimeters hereafter referred as the Meter are 3 1 2 digits with steady operations fashionable design and highly reliable hand held measuring instrument The Meter can measure AC DC voltage AC DC Current Resistance Temperature Diode and Continuity It is an ideal tool for maintenance Except where noted the descriptions and instructions in this Operating Manual apply to all Model UT33B UT33C UT33D Model UT33B C D OPERATING MANUAL Unpacking Inspection Open the package case and take out the Meter Check the following items carefully to see any missing or damaged part ltem Description _ Qty English Operating Manual Test Lead Point Contact Temperature Probe UT33C only 4 Holster 1 fiPeee In the event you find any missing or damage please contact your dealer immediately Model UT33B C D OPERATING MANUAL Safety Information 1 Safety Information This Meter complies with the standards IEC61010 in pollution degree 2 overvoltage category CAT 600V CAT II 300V and double insulation CAT I Signal level
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