Uni-Trend UT20B multimeter
Contents
1. Do not attempt to repair or service your Meter unless you are gualified 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 Model UT20B OPERATING MANUAL Maintenance 1 A General Service Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents Toclean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings 28 Model UT20B OPERATING MANUAL Maintenance 2 Turn the Meter to OFF position when it is not in use and take out the battery when not using for a long time Do not store the Meter in a place of humidity high temperature and strong magnetic field 29 Model UT20B OPERATING MANUAL Maintenance 3 B Replacing the Battery 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 To replace the battery 1 2 8 4 5 Turn the Meter to OFF position Remove the screw from case bottom and separate the case bottom from the case top Remove the battery from the battery compartment Replace the battery with a new 12V battery A23 Rejoin the case bottom and case top and reinstall the screw 30 Model UT20B OPERATING MANUAL Maintenance 4 C Replacing the Fu2. 3 C 5 C Relative humidity lt 75 Temperature coefficient 0 1 x specified accuracy 1 C A AC Voltage Range Resolution Accuracy Model UT20B OPERATING MANUAL Accuracy Specifications 1 Overload Protection 200V 100mV 5595 15 300V DC or AC rms 300V 1V Remarks Input impedance approx 0 5MQ Displays effective value of sine wave mean value response Frequency response 45Hz 400Hz 24 LINI T Model UT20B OPERATING MANUAL Accuracy Specifications 2 B DC Current Range Resolution Accuracy Overload Protection 2000uA 1uA 10A 2 5 10 0 2A 250V fast type fuse 5x20mm 200mA 100 C Square Wave Output Output approx at 50Hz square wave As a simple signal T source with 47kQ resistance output 25 Remark Displays battery s voltage value between the cathode and anode E Diodes Test Range Resolution Remarks Open circuit voltage approximate 3V Displays approximate forward voltage drop 0 5V 0 8V 26 LINI T Model UT20B OPERATING MANUAL Accuracy Specifications 4 F Resistance Test Accuracy 2 5 5 Accuracy Overload Protection 1 5 2 2 5 2 300V DC or AC rms Remark Input impedance approx 1MQ 27 LINI T This section provides basic maintenance information including battery and fuse replacement instruction A warning
3. Model UT20B OPERATING MANUAL Table of Contents 1 Title Page Overview ou T es 3 Unpacking Inspection 4 Safety Information 5 Rules For Safe Operation 6 International Electrical Symbols 9 Rotary Switch _ 10 Display Symbols 25 ES 10 Measurement Operation oM A AC Voltage Measurement 11 B DC Current Measurement 13 C Square Wave Output 15 D Battery Test 16 E Diodes Test M7 Measuring Resistance 19 G DC Voltage Measurement 21 1 Model UT20B OPERATING MANUAL Table of Contents 2 Title Page General Specifications 23 Accuracy Specifications __ 24 A AC Voltage ___________ 24 B DC Current __________ 25 C Square Wave Output_______ 25 D Battery Test___________ 26 E Diodes Test______________ 26 Resistance Test 127 G DC Voltage 127 Maintenance __ Ze 28 A General Service___________ 28 B Replacing the Battery 30 C Replacing the Fuses 31 Model UT20B OPERATING MANUAL Overview This Operation Manual covers information on safety and cautions Please read the relevant information carefully and observe all the Warnings and Notes strictly A warning To avoid electric shock or personal injury read the Safety Information and R
4. age to be measured is unknown use the maximum measurement position 300V and reduce the range step by step until a satisfactory reading is obtained In each range the Meter has an input impedance of 21MQ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 1kQ 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 22 LINI T Model UT20B OPERATING MANUAL General Specifications Maximum Voltage between any Terminals and Grounding 300V rms AN Fused Protection Input Terminal 0 2A 250V fast type 65x20 mm Maximum Display Display 1999 Measurement Speed Updates 2 5 times second Temperature Operating 0 C 40 C 32 F 104 F Storage 10 C 50 C 14 F 122 F Relative Humidity 575 0 C 30 lt 50 31 C 40 C Altitude Operating 2000 m Storage 10000 m Battery Type One piece of 12V Battery A23 Battery Deficiency Display ES Negative reading Display Overloading Display Dimensions HxWxL 95 x 52 x 26mm Weight Approx 100g battery included Safety Compliances 1EC61010 CAT II 300V overvoltage and double insulation standard Certification CE 23 LINI T Accuracy a reading b digits guarantee for 1 year Operating temperature 2
5. e 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 diodes 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 2 appears With a low battery the Meter might produce false readings that can lead to electric shock and personal injury Turn the Meter power off before opening the Meter case When servicing the Meter use only the same model number or identical 7 Model UT20B OPERATING MANUAL Rules For Safe Operation 3 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 Model UT20B OPERATING MANUAL International Electrical S
6. h is effective value of sine wave mean value response 11 Model UT20B OPERATING MANUAL Measurement Operation 2 Note If the value of voltage to be measured is unknown use the maximum measurement position 300V and reduce the range step by step until a satisfactory reading is obtained In each range the Meter has an input impedance of approx 0 5MQ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 1kQ the error is negligible 0 2 or less When AC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test 12 Model UT20B OPERATING MANUAL Measurement Operation 3 B DC Current Measurement ZA warning Never attempt an in circuit current measurement where the open circuit voltage between the circuit and ground is greater than 300V 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 current measurement has measurement positions on the rotary switch 20001A 20mA and 200mA To measure current do the following 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Set the rotary switch to an appropriate measurement posit
7. in range 2 Connect the 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 Note When battery testing has been completed disconnect the connection between the testing leads and the battery under test 16 LINI T Model UT20B OPERATING MANUAL Measurement Operation 7 E Diodes Test 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 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 a diode out of a circuit connect the Meter as follows 1 Set the rotary switch to gt 17 LINI T Model UT20B OPERATING MANUAL Measurement Operation 8 2 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
8. ion in As range 13 Model UT20B OPERATING MANUAL Measurement Operation 4 3 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 4 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 200mA 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 14 Model UT20B OPERATING MANUAL Measurement Operation 5 C Square Wave Output ZA warning To avoid damages to the Meter do not allow output terminals to reach higher than 10V To measure square wave output proceed as follows 1 Set the rotary switch to lr 2 Connect the test leads across with the object being measured The measured value shows on the display Note The frequency is approx 50Hz The output voltage range will be over 3Vpp when it is loaded 1MQ When square wave output testing has been completed disconnect the connection between the testing leads and the circuit under test 15 Model UT20B OPERATING MANUAL Measurement Operation 6 D Battery Test To test the battery proceed as follows 1 Set the rotary switch to the 1 5V or 9V measurement position
9. nput 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 X precision readings of resistance For high resistance measurement gt 1MQ it is normal taking several seconds to obtain a stable reading If Q reading with shorted test leads is not lt 0 5Q check for loose test leads or incorrect function selection 20 LINI T The LCD displays indicating open circuit for the tested resistor or the resistor value is higher than the maximum range of the Meter When resistance measurement has been completed disconnect the connection between the testing leads and the circuit under test Model UT20B OPERATING MANUAL Measurement Operation 11 DC Voltage Measurement avoid harms or damages to the Meter from electric shock please do not attempt to measure voltages higher than 300V 300V rms although readings may be obtained The DC voltage measurement positions are 200mV 2000mV 20V 200V and 300V To measure DC Voltage connect the Meter as follows 1 Set the rotary switch to an appropriate measurement positions in range 21 LINI T Model UT20B OPERATING MANUAL Measurement Operation 12 2 Connect the test leads across with the object being measured The measured value shows on the display Note If the value of volt
10. 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 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 18 LINI T Model UT20B OPERATING MANUAL Measurement Operation 9 F Measuring Resistance ZA 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 measurement positions are 2000 20000 20kQ 200kQ and 2000kQ To measure resistance connect the Meter as follows 1 Set the rotary switch to an appropriate measurement position in Q range 2 Connect the test leads across with the object being measured The measured value shows on the display 19 LI NI Model UT20B OPERATING MANUAL Measurement Operation 10 Note If the value of resistance to be measured is unknown use the maximum measurement position 2000kQ and reduce the range step by step until a satisfactory reading is obtained The test leads can add 0 1Q to 0 2Q of error to resistance measurement To obtain precision readings in low resistance measurement that is the range of 200Q short circuit the i
11. ses 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 2 3 Turn the Meter to OFF position Remove the screw from 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 and make sure the fuse is fixed firmly in the bracket Fuse 0 2A 250V fast type 5 20 31 Model UT20B OPERATING MANUAL Maintenance 5 5 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 This operating manual is subject to change without notice 32 Model UT20B OPERATING MANUAL 33 Model UT20B OPERATING MANUAL Copyright 2001 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
12. 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 9 Model UT20B OPERATING MANUAL Rules For Safe Operation 1 L 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 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 Model UT20B OPERATING MANUAL Rules For Safe Operation 2 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 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 th
13. ules for Safe Operation carefully before using the Meter Digital Multimeter Model UT20B hereafter referred to as the Meter is a pocket size hand held digital multimeter with advanced design multiple functions and reliable performance Because of its small size it is very convenience for user to work with it It is very easy to operate so it is suitable to the beginner of multimeter Besides the basic functions the Meter also has some extraordinary functions such as battery test and square wave output Model UT20B OPERATING MANUAL Unpacking Inspection Open the packing case and take out the Meter Check the following items carefully to see any missing or damaged part Item Description Cty Operating Manual 2 Test Lead affixed onto the Meter 12V Battery A23 installed In the event you find any missing or damage please contact your dealer immediately Model UT20B OPERATING MANUAL Safety Information This Meter complies with the standards IEC61010 in pollution degree 2 overvoltage category CAT Il 300V and double insulation CAT II Local level appliance PORTABLE EQUIPMENT etc with smaller transient voltage overvoltages than CAT Ill 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
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15. ymbols AC Alternating Current DC Direct Current Grounding Double Insulated Deficiency of Built In Battery Diode Fuse Warning Refer to the Operating Manual Conforms to Standards of European Union Model UT20B OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions Rotary Switch Position Function OFF Turn on or off the power AC voltage measurement range from 200V to 300V As DC current measurement range from 2000UA to 200mA ar Square wave output Battery test 1 5V amp 9V battery gt Diode test Q Resistance measurement range from 200Q to 2000kQ Vs DC voltage measurement range from 200mV to 300V Display Symbols Symbol Meaning Indicates negative reading 1 The input value is too large for the selected range 10 Model UT20B OPERATING MANUAL Measurement Operation 1 A AC Voltage Measurement ZA warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 300V rms although readings may be obtained The AC voltage measurement positions are 200V and 300V To measure AC Voltage connect the Meter as follows 1 Set the rotary switch to an appropriate measurement positions in V v range 2 Connect the test leads across with the object being measured The measured value shows on the display whic
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