Uni-Trend UT39A multimeter
Contents
1. Kwun Tong Kowloon Hong Kong Tel 852 2950 9168 Fax 852 2950 9303 Email info uni trend com http www uni trend com 282. Model UT39A B C OPERATING MANUAL TABLE OF CONTENTS TITLE PAGE Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure Functional Buttons Display Symbols OMDANN Q G G Measurement Operation A DC Voltage Measurement B AC Voltage Measurement C DC Current Measurement D AC Current Measurement E Measuring Resistance F Frequency Measurement The Model UT39C 5 15 G Temperature Measurement The Model UT39C only 16 LlB a ax oO H Capacitance Measurement 7 I Measuring Diodes amp rice 18 J Measuring Transistor A 19 Sleep Mode u gt 20 General Specifications E E 20 Accuracy Specifications u 21 A DC Voltage p 5 21 B AC Voltage S s 21 C DC Current 5 E 22 D AC Current E 22 E Resistance Test 23 F Frequency The Model UT39C only 23 G Temperature The Model UT39C only 23 H Capacitance 24 Model UT39A B C OPERATING MANUAL PAGE Diodes and Continuity Test 24 J Transistor Test 24 Maintenance
3. 25 A General Service 25 B Replacing the Battery 25 C Replacing the Fuses 26 Model UT39A B C OPERATING MANUAL Overview A warning To avoid electric shock or personal injury read the Safety Information and Rules for Safety Operation carefully before using the Meter Digital Multimeters Model UT39A UT39B and UT39C hereafter referred to as the Meter are 3 1 2 digits with steady operations fashionable structure and highly reliable hand held measuring instrument The Meter uses large scale of integrated circuit with double integrated A D converter as its core and has full range overload protection The Meter not only can measure AC DC Voltage AC DC Current Resistance Capacitance Temperature Transistor Freguency Diodes and Continuity but also has Data Hold and Sleep Mode features The Meter comes with a holster which can provide sufficient and anti shaking Unpacking Inspection Open the package case and take out the Meter Check the following items carefully to see any missing or damaged part Item Description Qty 1 English Operating Manual 1 piece 2 Test Lead 1 pair 3 Point Contact Temperature Probe 1 piece UT39C only 4 Holster 1 piece 5 9V Battery NEDA 1604 or 6F22 or 006P 1 piece In the event you find any missing or damage please contact your dealer immediately Model UT39A B C OPERATING MANUAL Safety Informati
4. extra attention when measuring high voltages to avoid electric shock To measure AC Voltage connect the Meter as follows 1 Insert the red test lead into the VQ 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 4 ms The measured value shows on the display which is effective value of sine wave mean value response Model UT39A B C OPERATING MANUAL Note If the value of voltage to be measured is unknown use the maximum measurement position 750V and reduce the range step by step until a satisfactory reading is obtained The LCD displays 1 indicating the existing selected range is overloaded 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 C DC Current Measurement see figure 4 figure 4 A Warning Never attempt an in circuit current measurement where the open circuit voltage between terminals and ground is greater than 60V DC or 30V rms If the fuse burns ou
5. more negative side of the break 5 Turn on power to the circuit The measured value shows on the display Note If the value of current to be measured is unknown use the maximum measurement position 20A and 20A terminal or 10A and 10A terminal and reduce the range step by step until a satisfactory reading is obtained Replace appropriate rating fuse when the fuse is burnt Fuse specification 0 315A 250V fast type fuse 5 x 20mm UT39A UT39B At 10A Range For continuous measurement 10 seconds and interval not less than 15 minutes A O Model UT39A B C OPERATING MANUAL UT39C At 20A Range For continuous measurement lt 10 seconds and interval not less than 15 minutes When current measurement has been completed disconnect the connection between the testing leads and the circuit under test figure 5 A Warning 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 To measure resistance connect the Meter as follows 1 Insert the red test lead into the VQ terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in Q range 3 Connect the test leads across with the object being measured The measured value shows on the display Note The test leads can add 0 12 to 0 30 of error to the resistance measurement To obtain pre
6. of a circuit connect the Meter as follows 1 Insert the red test lead into the VQ terminal and the black test lead into the COM terminal 2 Set the rotary switch to n 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 LCD displays the nearest value of diode forward voltage drop 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 Connect the test leads to the proper terminals as said above to avoid error display The LCD displays 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 Model UT39A B C OPERATING MANUAL Testing for Continuity To test for continuity connect the Meter as below 1 Insert the red test lead into VQ terminal and the black test lead into the COM terminal 2 Set the rotary switch to PH 1 Connect the test leads across with the object being measured 4 The buzzer sounds continuously if the resistance of a circuit under test is lt 10Q it indicates the circuit is in good connection The bu
7. T39A B C OPERATING MANUAL C DC Current Accuracy Overload UT39A UT39B UT39C Protection 20A 0 01uA 2 5 0 8 1 0 8 1 fast type fuse 0 8 200mA 100A 1 5 1 ON oma Ee Remark UT39A UT39B At 10A Range For continuous measurement 10 seconds and interval not less than 15 minutes UT39C At 20A Range For continuous measurement 10 seconds and interval not less than 15 minutes Measurement voltage drop Full range at 200mV D AC Current Range Resolution Accuracy Overload UT39A UT39B UT39C Protection fast type fuse zoma TA BUSES 200mA 100pA 1 8 3 6 5x 20mm Ta Tm Tens Remark UT39A UT39B At 10A Range For continuous measurement 10 seconds and interval not less than 15 minutes UT39C At 20A Range For continuous measurement 10 seconds and interval not less than 15 minutes Measurement voltage drop AS range at 200mV Frequency reaponse 40Hz 400Hz Display effective value of sine wave mean value response 22 Model UT39A B C OPERATING MANUAL E Resistance Test Accuracy Overload Range Resolution UT39A UT39B UT39C Protection 2000 0 8 3 TAN 20ka 100 0 T 250V DC 0 seem wa ama ooma 0a aa Remark Open circuit voltage At 200MQ range approx 3V Other ranges s700mV At 200MQ range test lead is in short circuit and it is normal to display 10 digit
8. cision readings in low resistance that is the range of 200Q short circuit the red and black test leads beforehand and record the reading obtained called this reading as X Then use the equation measured resistance value Y X precision readings of resistance For high resistance gt 1MQ it is normal taking several seconds to obtain a stable reading Model UT39A B C OPERATING MANUAL When there is no input for example in open circuit condition the Meter displays 1 I When resistance measurement has been completed disconnect the connection between the testing leads and the circuit under test F The Model UT39C Frequency Measurement see figure 6 figure 6 A Warning To avoid harm to you or damages to the Meter do not attempt to measure voltages higher than 60V in DC or 30V rms in AC although readings may be obtained When the frequency signal to be tested is higher than 30V rms the Meter cannot guarantee accuracy of the measurement To measure frequency connect the Meter as follows 1 Insert the red test lead into the VQ terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in kHz range 3 Connect the test leads across with the object being measured The measured value shows on the display Note When Hz measurement has been completed disconnect the connection between the testing leads and the circuit under
9. conds and interval not less than 15 minutes UT39C At 20A Range For continuous measurement lt 10 seconds and interval not less than 15 minutes When current measurement has been completed disconnect the connection between the testing leads and the circuit under test LINI T Model UT39A B C OPERATING MANUAL D AC Current Measurement see figure 4 with dotted line A Warning Never attempt an in circuit current measurement where the voltage between terminals and ground is greater than 60V or 30V rms If the fuse burns out during measurement the Meter may be damaged or the operator himself may be hurt Disconnect power supply before making measurement 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 To measure current do the following 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Insert the red test lead into the mA or 20A terminal or 10A terminal and the black test lead into the COM terminal When measuring current at 200mA below insert the red test lead into MA terminal while measuring current 200mA or above insert the red test lead into 10A or 20A terminal Set the rotary switch to an appropriate measurement position in Aw 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
10. hen servicing the Meter use only 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 power 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 Model UT39A B C OPERATING MANUAL International Electrical Symbols Deficiency of Built In Battery AC Alternating Current AC or DC Double Insulated Warning Refer to the Operating Manual Conforms to Standards of European Union Grounding 75 DC Direct Current 1 LCD Display 2 Data Hold Button 3 Transistor Jack 4 COM Input Terminal 5 Other Input Terminals 6 mA Input Terminal 7 20A 10A Input Terminal 8 Capacitance Jack 9 Rotary Switch 10 Power Model UT39A B C OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations Button POWER Yellow Button Operatio
11. ith identical model number or electrical specifications before using the Meter Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and grounding The rotary switch should be placed in the right position and no any changeover of range shall be made during measurement is conducted to prevent damage of the Meter When the Meter working at an effective voltage over 60V in DC or 30V 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 Model UT39A B C OPERATING MANUAL continuity diodes capacitance or 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 E3 appears With a 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 Meter case W
12. leads away from the input terminals of the Meter 2 Press the Meter power off 3 Remove the holster from the Meter 4 Remove the screw from the battery compartment and then take out the battery door 5 Remove the screw inside the battery compartment and also the other two screws from the case bottom and then separate the case bottom from the case top 26 LINI T Model UT39A B C OPERATING MANUAL 6 Remove the fuse by gently prying one end loose and then take out the fuse from its bracket 7 Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket 0 315A 250V fast type fuse p 5 x 20mm 8 Rejoin the case bottom and the case top and install the screw 9 Rejoin the battery door from the battery compartment and install the screw 10 Rejoin the holster and the Meter Replacement of fuses is seldom reguired Burning of a fuse always results from the improper operation END This operating manual is subject to change without notice 27 Model UT39A B C OPERATING MANUAL Copyright 2004 Uni Trend Group Limited All rights reserved Manufacturer Uni Trend Technology Dongguan Limited Dong Fang Da Dao 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 Roa
13. n Performed Turn the Meter on and off Press down the POWER to turn on the Meter Press up the POWER to turn off the Meter HOLD Blue Button Press HOLD again to exit hold mode I Press HOLD once to enter hold mode l In Hold mode I is displayed and the present value is shown Display Symbols see figure 2 UN 8 7 ERN eo L a Vo Mov a wet figure 2 Meaning Data hold is active Indicates negative reading The battery is low 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 appears Unit of Transistor Centigrade temperature Test of diode o aj The continuity buzzer is on Dangerous Voltages Model UT39A B C OPERATING MANUAL Measurement Operation Make sure the Sleep Mode is not on if you found there is no display on the LCD after turning on the Meter Make sure the Low Battery Display F4 is not on otherwise false readings may be provided Pay extra attention to the A symbol which is located besides the input terminals of the Meter before carrying out measeurement A DC Voltage Measurement see figure 3 Red figure 3 A warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000V or 750V rm
14. on This Meter complies with the standards IEC61010 in pollution degree 2 overvoltage category CAT 1000V CAT II 600V and double insulation CAT I Signal level special equipment or parts of equipment telecommunication electronic etc with smaller transient overvoltages than overvoltages CAT Il CAT Il Local level appliance PORTABLE EQUIPMENT etc with smaller transient voltage overvoltages than CAT III Use the Meter only as specified in this operating manual otherwise the protection provided by the Meter may be impaired 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 7 Model UT39A B C OPERATING MANUAL Rules For Safe Operation A 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 Inspect the test leads for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads w
15. rgent as dirt or moisture in the terminals can affect readings Press the Meter power off when it is not in use and take out the battery when not using for a long time Do not store the Meter in place of humidity high temperature explosive inflammable and strong magnetic field B Replacing the Battery see figure 10 figure 10 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 4 appears 25 Model UT39A B C OPERATING MANUAL To replace 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 2 Press the Meter power off 3 Remove the screw from the battery compartment and then take out the battery door from the battery compartment Remove the battery from the battery compartment Replace the battery with a new 9V battery NEDA 1604 or 6F22 or 006P Rejoin the battery door and the battery compartment and install the screw pP 9 C Replacing the Fuses see figure 11 figure 11 NY A 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
16. rsonal dangerous To measure capacitance connect the Meter as follows 1 Insert the capacitor to be tested into the capacitance jack 2 Set the rotary switch to an appropriate measurement position ind range 3 Connect the test leads across with the object being measured The measured value shows on the display Note For testing the capacitor with polarity connect the red test lead to anode amp black test lead to cathode When the tested capacitor is shorted or the value is overloaded the LCD display 1 To minimize the measurement error caused by the distributed capacitor the connection should be as short as possible It is normal to take a while for zeroing when changing over the measurement range This process will not affect the accuracy of the final readings obtained Model UT39A B C OPERATING MANUAL I Measuring Diodes amp Continuity A Warning To avoid damage to the Meter or to the equipment under test disconnect circuit power and discharge all high voltage capacitors before measuring diodes and continuity Never attempt to input over 60V in DC or 3V rms in AC to avoid personal dangerous Testing 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 across the junction A good silicon junction drops between 0 5V and 0 8V To test out a diode out
17. s During measurement subtract the 10 digits from the reading F The Model UT39C Frequency Overload Protection 3 29195 250V AC 20kHz 1 5 5 Remark Input Sensitivity lt 200mV When the input voltage is gt 30V rms no guaranteed accuracy G The Model UT39C Temperature Overload Protection 40 C 0 C 4 4 1 C 400 C rc 2 8 250V AC 401 C 1000 C 3 10 23 Model UT39A B C OPERATING MANUAL H Capacitance 9 UT39A UT39B UT39C Protection ate a UVAE E uwa porjo seem Remark Testing signal approx 400Hz 40mV rms l Diodes and Continuity Test Remark Open circuit voltage Approx 70 2 buzzer J Transistor Test Range Remarks Testing Conditions Can measure NPN or PNP hFE i Vee 2 8V transistor Display range bo 101A 0 1000P 24 Model UT39A B C OPERATING MANUAL Maintenance This section provides basic maintenance information including battery and fuse replacement instruction A 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 damp cloth and mild detergent Do not use chemical solvent To clean the terminals with cotton bar with dete
18. s although readings may be obtained Take extra attention when measuring high voltages to avoid electric shock To measure DC voltage connect the Meter as follows 1 Insert the red test lead into the VO input terminal and the black test lead into the COM input terminal 2 Set the rotary switch to an appropriate measurement position in Vzz range 3 Connect the test leads across with the object being measured The measured value shows on the display Model UT39A B C OPERATING MANUAL Note If the value of voltage to be measured is unknown use the maximum measurement position 1000V and reduce the range step by step until a satisfactory reading is obtained The LCD displays 1 indicating the existing selected range is overloaded 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 DC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test B AC Voltage Measurement see figure 3 with dotted line A Warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000V or 750V rms although readings may be obtained Take
19. t during measurement the Meter may be damaged or the operator himself may be hurt Disconnect power supply before making measurement 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 Model UT39A B C OPERATING MANUAL To measure current do the following 1 2 oo Turn off power to the circuit Discharge all high voltage capacitors Insert the red test lead into the mA or 20A or 10A terminal and the black test lead into the COM terminal When measuring current at 200mA below insert the red test lead into mA terminal while measuring current 200mA or above insert the red test lead into 10A or 20A terminal Set the rotary switch to an appropriate measurement position in Az range Break the current path to be tested Connect the red test lead to the more positive side of the break and he DU test lead to the more negative side of the reak Turn on power to the circuit The measured value shows on the display Note If the value of current to be measured is unknown use the maximum measurement position 20A and 20A terminal or 10A and 10A terminal and reduce the range step by step until a satisfactory reading is obtained Replace appropriate rating fuse when the fuse is burnt Fuse specification 0 315A 250V fast type fuse b 5x 20mm UT39A UT39B At 10A Range For continuous measurement lt 10 se
20. test Model UT39A B C OPERATING MANUAL G The Model UT39C Temperature Measurement see figure 7 9 Black Red Pee see figure 7 A Warning To avoid harm to you or damages to the Meter do not attempt to measure voltages higher than 60V in DC or 30V rms in AC although readings may be obtained To measure temperature connect the Meter as follows 1 Insert the red temperature into the VQ terminal and the black temperature probe into the COM terminal 2 Set the rotary switch to C 3 Place the temperature probe to the object being measured The measured value shows on the display Note The Meter displays 1 when there is no temperature probe connection The included temperature probe can only be measured up to 250 C For any mesaurement higher than that the rod type temperature probe must be used instead When temperature measeuremnet has been completed disconnect the connection between the testing leads and te circuit under test Model UT39A B C OPERATING MANUAL H Capacitance Measurement see figure 8 figure 8 A Warning To avoid damage to the Meter or to the equipment under test disconnect the tested circuit power when measuring on line capacitors and discharge all high voltage capacitors before measuring capacitance Use the DC voltage function to confirm that the capacitor is discharged Never attempt to input over 60V in DC or 3V rms in AC to avoid pe
21. ual ranging Maximum Display 1999 Mesaurement 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 5096 31 C 40 C Altitude Operating 2000m Storage 10000m Battery Type 9V NEDA1604 or 6F22 or OO6P Battery Deficiency Display ga Data Holding Display m Negative reading Display Overloading Display 1 Dimensions HxWxL 172x83x38mm Weight Approx 310g battery included Safety Compliances IEC61010 CAT 1000V CATII 600V overvoltage and double insulation standard Certificate C 20 LINI T Model UT39A B C OPERATING MANUAL Accuracy Specifications Accuracy a reading b Oi guarantee for 1 year Operating temperature 23 C 5 Relative humidity lt 75 Temperature coefficient 0 1 x specified accuracy 1 C A DC Voltage Range Resolution Accuracy Overload 9 UT39A UT39B UT39C Protection comv 100uV 250V DC ft al 0 5 1 10mV 1000V DC 2oov or 750V AC 000V 1V 0 8 2 Lus Remark Inputimpedance 10MQ B AC Voltage Range Resolution Accuracy Overload 2 UT39A UT39B UT39C Protection 0 8 3 1000V DC 0 898 20001 06 200V 100mv 750V 1 2 3 Remark Input impedance 10MQ Frequency response 40Hz 400Hz Display effective value of sine wave mean value response 21 Model U
22. zzer does not sound if the resistance of a circuit under test is gt 70Q it indicates broken circuit The buzzer may or may not sound if the resistance of a circuit under test is between 102 to 70Q The LCD displays the resistance value of a circuit under test Note The LCD displays 1 indicating the circuit being tested is open When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test J Measuring Transistor see figure 9 yes SI PNP OS e Sas figure 9 To measure transistor connect the Meter as follows 1 Set the rotary switch to hFE 2 Insert the NPN or PNP type transistor to be tested into the transistor jack 3 The measured nearest transistor value shows on the display Model UT39A B C OPERATING MANUAL Note When transistor measeurement has been completed remove the transistor from the transistor jack Sleep Mode To preserve battery life the Meter automatically turns off if you do not turn the rotary switch or press any button for around 15 minutes At that time the Meter consumes around 10HA current The Meter can be activated by pressing the POWER two times General Specifications Maximum voltage between any Terminals and Grounding 1000V AFused Protection for mA Input Terminal 0 315A 250V fast type 0 5 x 20mm A Fused Protection for 10A or 20A Input Terminal Un fused Range Man
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