Table of Contents
Contents
1. Model UT50D OPERATING MANUAL Measurement Operation 13 N Set the rotary switch to gt A 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 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 Testing for Continuity To test for continuity connect the Meter as below 1 2 3 Insert the red test lead into VQ4 C terminal and the black test lead into the COM terminal Set the rotary switch to4 A Connect the test leads across with the object being measured The buzzer sounds if the resistance of a circuit under test is less than 7022 The LCD displays the resistance value of a circuit under test 25 Model UT50D OPERATING MANUAL Measurement Operation 14 Note The LCD display 1 indicating the circuit bei2. and temperature probe from the Meter and turn the Meter power off before opening the Meter case When 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 UT50D OPERATING MANUAL International Electrical Symbols AC Alternating Current Fr DC Direct Current Grounding n Double Insulated Deficiency of Built In Battery A Warning Refer to the Operating Manual 3 Diode AC or DC t Fuse fi Continuity Test CE Conforms to Standards of European Union Model UT50D OPERATING MANUAL The Meter Structure see figure 1 figure 1 LCD Display Data Hold Button Rotary Switch Other Input Terminals COM Input Terminal 20A Input Terminal mA Input terminal Power ANOaARWN
3. which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicatorfjappears To replace battery 1 on as 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 Turn the Meter off Remove the rubber feet and screws from the battery compartment and separate the battery compartment from the case bottom Remove the battery from the battery compartment Replace the battery with a new 9V battery NEDA 1604 or 6F22 or 006P Rejoin the battery compartment and the case bottom and install the screw and rubber feet C Replacing the Fuses see figure 10 Fuse figure 10 34 Model UT50D OPERATING MANUAL Maintenance 3 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 leads away from the input terminals of the Meter Turn the Meter off Remove the rubber feet and screws from the case bottom and separate the case bottom from the case top Remove the fuse by gently prying one end loose and then take out the fuse from its bracket Install ONLY replacement fuses with the identical type and specification as follows a
4. 12 13 nF uF F Farad The unit of capacitance uF Microfarad 1 x 10 or 0 000001 farads nF Nanofarad 1 x 10 or 0 000000001 farads mH H H Henry The unit of Inductance mH Millihenry 1 x 10 or 0 001 henry 14 Q kQ MQ Q Ohm The unit of resistance kQ kilohm 1 x 10 or 1000 ohms MO Megaohm 1 x 105 or 1 000 000 ohms 12 Model UT50D OPERATING MANUAL Measurement Operation 1 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 J Display 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 black figure 3 Z 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 The DC Voltage ranges are 200mV 2V 20V 200V and 1000V To measure DC voltage connect the Meter as follows 13 Model UT50D OPERATING MANUAL Measurement Operation 2 1 2 3 Insert the red test lead into thei VO M C nput terminal and the black test lead into the COM input terminal Set the rotary switch to an appropriate measurement position in Vsrange Connect the test leads a
5. 34 C Replacing the Fuses Model UT50D 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 UT50D hereafter referred to as the Meter is a 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 Inductance Diodes and Continuity but also has Data Hold Full Icon Display and Sleep Mode features The Meter adopted advanced co injection technique in order to provide sufficient insulation and anti shaking In addition the Automatic Display Backlight feature enables user to work in a dim condition Model UT50D 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 installed inside the Meter Item Description Qty 1 English Operating Manual 1 piece 2 Test Lead 1 pair 3 Test Clip 1 piece 4 Point Contact Temperature Probe 1 piece 5 9V Battery NEDA 1604 6F22 or 009P piece In the event you find any miss
6. DM Model UT50D OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations Button Operation Performed POWER Yellow Button 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 once to enter hold mode Press HOLD again to exit hold mode In Hold mode i is displayed and the present value is shown 10 Model UT50D OPERATING MANUAL Display Symbols 1 see figure 2 figure 2 No Meaning Dangerous Voltages The battery is low Z Warning To avoid false readings which could lead to possible electric shock or personal inju replace the battery as soon as the battery indicator appears Indicator for AC voltage or current The displayed value is the mean value Indicates negative reading Test of diode Data hold is active The continuity buzzer is on Centigrade temperature oo I Oo oc 99 Fahrenheit temperature eo A Amperes amps The unit of current mA Milliamp 1 x 10 or 0 001 amperes uA Microamp 1x 10 or 0 000001 amperes 11 mV V V Volts The unit of voltage mV Millivolt 1 x 10 or 0 001 volts 11 Model UT50D OPERATING MANUAL Display Symbols 2 see figure 2 No Symbol Meaning
7. Table of Contents Title Page Overview z 5 a 3 Unpacking mepsetlan 4 Safety Information 3 E 3 5 Rules For Safe Operation 6 International Electrical Symbols 8 The Meter Structure i S ds 9 Functional Buttons 10 Display Symbols z 11 Measurement Operation 43 A DC Voltage Measurement 13 B AC Voltage Measurement 15 C DC Current Measurement 16 D AC Current Measurement 17 E Measuring Resistance 19 F Inductance Measurement 20 G Capacitance Measurement 21 H Temperature Measurement 23 I Measuring Diodes amp Continuity 24 Sleep Mode 27 Turning on the Auto Display Backlight zl 27 General Specifications 7 2 S 28 Accuracy Specifications a 29 A DC Voltage mes 29 B AC Voltage 29 C DC Current 30 D AC Current 30 E Resistance Test 81 F Inductance t E E 31 G Capacitance 31 H Temperature E 32 Diodes and Continuity Test 32 Model UT50D OPERATING MANUAL Title Page Maintenance E E E 33 A General Service E z 33 B Replacing the Battery 33
8. cifications 4 H Temperature i Overload Range Resolution Accuracy rotection 40C 0C B 3 0C 400C TC t 19543 250V rms 400 C 1000C 25 l Diodes and Continuity Test Function Range Resolution Input Remark Protection Diodes gt Open circuit 1mV voltage approx 250V DC 28V Continuity orAC lt 70 Qbuzzer 10 b Test A continuously 32 Model UT50D OPERATING MANUAL Maintenance 1 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 detergent as dirt or moisture in the terminals can affect readings Turn the Meter 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 9 Rubber foot Eo Screw Fuse figure 10 33 Model UT50D OPERATING MANUAL Maintenance 2 Astana To avoid false readings
9. cross with the object being measured The measured value shows on the display 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 10MO This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10k Q 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 Model UT50D OPERATING MANUAL Measurement Operation 3 B AC Voltage Measurement see figure 3 in 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 The AC voltage measurement has 4 measurement positions on the rotary switch 2V 20V 200V and 750V To measure AC Voltage connect the Meter as follows T Insert the red test lead into the VQ C terminal and the black test lead into the COM terminal 2 Setthe rotary switch to an appropriate measurement position in Ve range 3 Connect the test leads acr
10. drop Full range at 200mV D AC Current Range Resolution Accuracy Overload Protection 20mA 0O0 01mA 1 3 0 5A 250V fast type 200mA 0 1mA 1 8 3 fuse 65x20mm 20A 10mA 3 5 Un Fused Remarks At 20A Range For continuous measurement lt 10 seconds and interval not less than 15 minutes Measurement voltage drop Full range at 200mV Frequency reaponse 40Hz 400Hz Display effective value of sine wave mean value response 30 Model UT50D OPERATING MANUAL Accuracy Specifications 3 E Resistance Test Range Resolution Accuracy pvoroad 2000 0 10 0 8 3 2kQ 10 200kQ 100Q 0 8 1 250V rms 2MQ 1kQ 20M9 10kQ 1 5 Remarks At 200Qrange short circuit the test lead first to display the test lead resistance value During measurement subtract the test lead resistance value from the displayed reading to obtain the accurate reading F Inductance Range Resolution Accuracy Overload Protection 250V rms Remarks The tested inductance Q2 10 Internal resistance S1 3kO G Capacitance Range Resolution Accuracy Overload Protection 20nF 10pF 200nF 100pF 2 5 5 250V E rms 100uF 100nF 5 4 Remarks When the tested capacitor is higher than 30uF the reading obtained is only for reference 31 Model UT50D OPERATING MANUAL Accuracy Spe
11. eads are connected to the current terminals do not parallel them across any circuit The AC current measurement has 3 measurement positions on the rotary switch 20mA 200mA and 20A 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 and the black test lead into the COM terminal 3 Set the rotary switch to an appropriate measurement position in Aw range 4 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 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 and reduce the range step by step until a satisfactory reading is obtained When current measurement has been completed disconnect the connection between the testing leads and the circuit under test 18 Model UT50D OPERATING MANUAL Measurement Operation 7 E Measuring Resistance see figure 5 DC black 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 The resistance ranges are 2000 2k0 200kO 2MQ and 20MQ To measure resistance connect the Met
12. er as follows 1 Insert the red test lead into the VO C terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position inQrange 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 to0 3Qof error when measuring low resistance that is the range of 200Q To obtain precision readings in low resistance use the following equation 19 Model UT50D OPERATING MANUAL Measurement Operation 8 Precision readings of resistance Measurement displayed reading minus the short circuit value of red and black test lead For high resistance gt 1MQ it is normal taking several seconds to obtain a stable reading When there is no input for example in open circuit condition the Meter displays 1 When resistance measurement has been completed disconnect the connection between the testing leads and the circuit under test F Inductance Measurement see figure 6 figure 6 AN warning Make sure the tested inductance is far away from the high electromagnetic to obtain accurate reading Inductance measurement has 4 measurement positions on the rotary switch 2mH 20mH 200mH and 20H To test for Inductance connect the Meter as below 20 Model UT50D OPERATING MANUAL Measurement Operation 9 JE According to the size of the tested object s leads insert mu
13. he rotary switch to C 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 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 23 Model UT50D OPERATING MANUAL Measurement Operation 12 When temperature measeuremnet has been completed disconnect the connection between the testing leads and te circuit under test I Measuring Diodes amp Continuity see figure 9 red amp black figure 9 ZN 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 To avoid harms to you or damages to the Meter never attempt to measure voltages higher than 60V in DC or 30V rms in AC 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 of a circuit connect the Meter as follows 1 Insert the red test lead into the VQ C terminal and the black test lead into the COM terminal 24
14. he rotary switch to an appropriate measurement position in FCx 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 or test clip to anode amp black test lead or test clip to cathode When the tested capacitor is shorted or the capacitor value is overloaded the LCD display 1 To minimize the measurement error caused by the distributed capacitor the testing lead or testing clip should be as short as possible To ensure precision especially when measuring small capacitance 200nF range the correct reading is as follows Measurement displayed reading minus the Meter s open circuit displayed value 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 22 Model UT50D OPERATING MANUAL Measurement Operation 11 H Temperature Measurement see figure 8 figure 8 L 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 The temperature measurement range is from 40 C 1000 C To measure temperature connect the Meter as follows 1 2 3 Insert the red temperature into the VQ C terminal and the black temperature probe into the COM terminal Set t
15. ing or damage please contact your dealer immediately Model UT50D OPERATING MANUAL Safety Information This Meter complies with the standards IEC61010 in pollution degree 2 overvoltage category CAT Il 1000V CAT III 600V and double insulation CAT II Local level appliance PORTABLE EQUIPMENT etc with smaller transient voltage overvoltages than CAT Ill CAT Ill Distribution level fixed installation with smaller transient overvoltages than CAT IV 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 8 Model UT50D OPERATING MANUAL Rules For Safe Operation 1 A warning To avoid possible electric shock or personal injury and to avoid possible damage to the Meter orto the eguipment 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 tes
16. lti purpose socket or test clip into the mA and VOC terminal 2 Set the rotary switch to an appropriate measurement position in HLx range 3 Insert the tested object into the corresponding jack of the multi purpose socket or connect the test clip to the object being measured The measured value shows on the display Note If the value of inductance to be measured is unknown use the maximum measurement position and reduce the range step by step until a satisfactory reading is obtained When inductance testing has been completed remove the multi purpose socket or test clip from the input terminal and remove multi purpose socket or test clip away from the input terminal of the Meter G Capacitance Measurement see figure 7 figure 7 21 Model UT50D OPERATING MANUAL Measurement Operation 10 PN warning To avoid damage to the Meter or to the equipment under test disconnect circuit power 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 30V rms in AC to avoid personal dangerous Capacitance measurement has 4 measurement positions on the rotary switch 20nF 200nF 2uF and 100pF To measure capacitance connect the Meter as follows 1 Insert the red test clip or red test lead into the VO C terminal and the black test clip or black test lead into the mA terminal 2 Sett
17. nd make sure the fuse is fixed firmly in the bracket 0 5A 250V fast type fuse 65x20mm Rejoin the case bottom and the case top and install the screw and rubber feet 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 35 Model UT50D OPERATING MANUAL Copyright 2003 Uni Trend International Limited All rights reserved Manufacturer UNI TREND TECHNOLOGY DONG GUAN LIMITED Address Dong Fang Da Dao Bei Shan Dong Fang Industrial Development District Hu Men Town Dong Guan City Guang Dong Province China Headquarters Uni Trend International Limited Address 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 36
18. ng tested is open When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test 26 Model UT50D OPERATING MANUAL 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 8 minutes At that time the Meter consumes around 10pA current The Meter can be activated by pressing the POWER two times Turning on the Auto Display Backlight The Meter has a built in sensor Therefore the Display Backlight turns on and off automatically depending on the brightness of the environment In a dim condition the Display Backlight turns on automatically while in a bright condition the Display Backlight turns off automatically 27 Model UT50D OPERATING MANUAL General Specifications Maximum voltage between any Terminals and Grounding 1000V rms AN Fused Protection for mA Input Terminal 0 5A 250V fast type 5x20mm Fused Protection for 20A Input Terminal Un fused Range Manual 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 50 31 C 40C Altitude Operating 2000m Storage 10000m Battery Type 9V NEDA1604 or 6F22 or 006P Battery Deficiency Display PE Data Holding Display Iz Negative reading Displa
19. oss with the object being measured The measured value shows on the display which is effective value of sine wave mean value response 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 10MO 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 AC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test Model UT50D OPERATING MANUAL Measurement Operation 4 C DC Current Measurement see figure 4 SWAY 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 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 The DC current measurement has 3 measurement positions on
20. t 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 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 Model UT50D OPERATING MANUAL Rules For Safe Operation 2 Disconnect circuit power and discharge all high voltage capacitors before testing resistance 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 appears With a low battery the Meter might produce false readings that can lead to electric shock and personal injury Remove test leads test clips
21. the rotary switch 2mA 200mA and 20A 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 and the black test lead into the COM terminal 3 Set the rotary switch to an appropriate measurement position in Azsrange 16 Model UT50D OPERATING MANUAL Measurement Operation 5 4 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 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 and reduce the range step by step until a satisfactory reading is obtained When current measurement has been completed disconnect the connection between the testing leads and the circuit under test D AC Current Measurement see figure 4 in dotted line D 7 7 A 7 7 A a figure 4 17 Model UT50D OPERATING MANUAL Measurement Operation 6 A 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 l
22. y wmm Overloading Display 1 Dimensions HxWxL 165x80x38 3mm Weight Approx 275g battery included Safety Compliances IEC61010 CAT II 1000V CAT III 600V overvoltage and double insulation standard Certificate ce 28 Model UT50D OPERATING MANUAL Accuracy Specifications 1 Accuracy a reading b digits guarantee for 1 year Operating temperature 23 C 5 C Relative humidity lt 75 Temperature coefficient 0 1 x specified accuracy 1 C A DC Voltage Range Resolution Accuracy Overload Protection 200mV 0 1mV 250V DC or AC rms 2V 0 001V_ 49 50444 zw oov 8 to00v pc 200V 0 1V 750V ACrms 1000V 1V 0 8 2 Remark Input impedance 10MQ B AC Voltage Range Resolution Accuracy Overload Protection 2V 0 001V 250V DC or AC rms 20V 0 01V 0 8 3 1000V DC 200V IN 750V ACrms 750V 1V 1 2 3 Remarks Input impedance 10MQ Frequency response 40Hz 400Hz Disp ay effective value of sine wave mean value response 29 Model UT50D OPERATING MANUAL Accuracy Specifications 2 C DC Current Range Resolution Accuracy Overload Protection 2mA 0 001mA 0 8 1 0 5A 250V fast type 200mA O 1mA 1 5 1 fuse o5x20mm 20A 10mA 2 5 Un Fused Remarks At 20A Range For continuous measurement lt 10 seconds and interval not less than 15 minutes Measurement voltage
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