Uni-Trend UT58B multimeter
Contents
1. figure 5 Awarning 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 Model UT 58A UT58B 200Q 2kQ 20kQ 2MQ 20MQ and 200MQ Model UT 58C 2002 2kQ 20kQ 2MQ and 20MQ 1 Insert the red test lead into the Hz VQ HUT58C or VO UT58A UT58B 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 17 Model UT58A B C OPERATING MANUAL Measurement Operation 5 Note The test leads can add 0 1to 0 2Q of error to the slow resistance measurement To obtain accurate readings in low resistance 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 X accurate readings of resistance If the input terminal short circuit reading 20 5 check the test leads for any looseness or other cause For high resistance gt 1MQ it is normal taking several seconds to obtain a stable reading select short test leads for stable and precise readings When the resistance is higher than the maximum range or in open circuit condition the Meter displays2. Model UT58A B C OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions Rotary Function Position Vi DC voltage measurement Vwa AC voltage measurement de Capacitance Test Q Resistance measurement gt Diode test A Continuity test Hz Frequency Test Aw AC Current Measurement A7 DC Current Measurement C Temperature hFE Frequency Test 10 Model UT58A B C OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations Button Operation Performed POWER Turn the Meter on and off Yellow Press down the POWER to turn on utton the Meter Press up the POWER to turn off the Meter HOLD Press HOLD once to enter hold mode Blue Press HOLD again to exit hold mode Button In Hold mode Bilis displayed and the present value is shown 11 Model UT58A B C OPERATING MANUAL Display Symbols 1 see figure 2 1 2m SEmVVOKOMO s hy 4 9 sl ee atten s 1 0 y ANA figure 2 No Symbol Meaning 4 hFE The Unit of Transistor Test 2 The battery is low AWarning To avoid false Ca readings replace the battery as soon as the battery indicator appears 3 AC Indicator for AC voltage or current The displayed value is the mean value 4 Indicates negativ
3. Model UT58A B C OPERATING MANUAL Table of Contents Title Page Overview 3 Unpacking Inspection F s 4 Safety Information 5 Rules For Safe Operation 6 International Electrical Symbols 8 The Meter Structure 9 Rotary Switch 10 Functional Buttons 11 Display Symbols a z 12 Measurement Operation 14 A DC and AC Voltage Measurement 14 B DC and AC Current Measurement 15 C Measuring Resistance 17 D Measuring Diodes a 4 18 E Testing for continuity 20 F Capacitance measurement 2 G Temperature Measurement UT58B UT58C only 22 H Measuring Transistor 23 l Frequency Measurement as only 24 Sleep Mode 24 Operation of Hold Mode 25 General Specifications 26 Accuracy Specifications 27 A DC Voltage 27 B AC Voltage 27 C DC Current 28 D AC Current E 28 E Resistance Test 29 F Diodes Test 29 G Continuity Test 29 H Capacitance 30 l Temperature So ont 30 J Transistor Test 31 Model UT58A B C OPERATING MANUAL Title Page K Frequency UT58C
4. e 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 19 Model UT58A B C OPERATING MANUAL Measurement Operation 7 l The open circuit voltage is around 3V When diode testing has been completed disconnect the connection between the testing leads and the circuit under test E Testing for Continuity see figure 7 A figure 7 Warning To avoid harms to you please do not attempt to input voltages higher than 60V DC or 30V rms AC To avoid damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before testing for continuity To test for continuity connect the Meter as below 1 Insert the red test lead into Hz VQ UT58C or VQ UT58A UT58B terminal and the black test lead into the COM terminal 2 Set the rotary switch to gt 7 3 Connect the test leads across with the object being measured 4 The buzzer does not sound if the resistance of a circuit under test is gt 700 The buzzer sounds continuously if the circuit is in good condition with resistance value lt 102 The measured value shows on the display and the unit is Q 20 Model UT58A B C OPERATING MANUAL Measurement Operation 8 Note The open circuit voltage is around 3V Whe
5. 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 l If the value to be measured is unknown use the maximum measurement position and reduce the range step by step until a satisfactory reading is obtained 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 Model UT58A B C OPERATING MANUAL Rules For Safe Operation 2 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 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
6. UT58B terminal and the black test lead into the COM input terminal 2 Set the rotary switch to an appropriate measurement position in V or V5 range 3 Connect the test leads across with the object to be measured The measured value shows on the display 14 Model UT58A B C OPERATING MANUAL Measurement Operation 2 Note e 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 e 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 e 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 DC and AC Current Measurement see figure 4 figure 4 ZA warning Never attempt an in circuit current measurement where the open circuit voltage between terminals and ground is greater than 250V If the fuse burns out during measurement the Meter may be damaged or the operator himself may be hurt 15 Model UT58A B C OPERATING MANUAL Measurement Operation 3 Use proper terminals functi
7. 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 fuse see figure 10 figure 10 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 32 Model UT58A B C OPERATING MANUAL Maintenance 2 To replace the Meter s fuse 1 Turn the Meter off and remove all connections from the terminals 2 Remove the holster from the Meter 3 Remove the 3 screws from the case bottom and separate the case top from the case bottom Remove the fuse by gently prying one end loose then take out the fuse from its bracket Install ONLY replacement fuses with the identical type and specification and make sure the fuse is fixed firmly in the bracket Fuse 0 5A 250V fast type b5x20mm Rejoin the case bottom and case top and reinstall the 3 screws and holster Replacement of the fuses is seldom required Burning of a fuse always results from improper operation C Replacing the Battery see figure 10 ZA warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator F4 appears a gn the Meter s battery on Turn the Meter power off and remove all connections from
8. your dealer immediately Model UT58A B C 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 to International electrical symbols used on the Meter and in this Operating Manual are explained on page 8 Model UT58A B C OPERATING MANUAL Rules For Safe Operation 1 Awarning 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 ifitis 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
9. 00 1000 C 2 5 Remarks e Overload protection CE Version Fusep 5x20mm 0 5A 250V e Temperature Probe Suitable for K type nickel chrome nickel silicon thermocouple accessory is a point contact K type nickel chrome nickel silicon thermocouple and suitable for testing temperature lower than 230 C 30 Model UT58A B C OPERATING MANUAL Accuracy Specifications 5 J Transistor test Range Resolution Accuracy a reading b digits hFE 18 Vce 3V lbo 104A 1000BMAX Remarks e Overload protection CE Version Fuse 5x20mm 0 5A 250V K Frequency UT58C only Range Resolution Accuracy Overload a 1 5 5 250V AC 20kHz 10Hz Remarks e 100mVrms lt input amplitude lt 30Vrms 31 Model UT58A B C 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 l 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
10. 1 When resistance measurement has been completed disconnect the connection between the testing leads and the circuit under test D Measuring Diodes see figure 6 figure 6 Model UT58A B C OPERATING MANUAL Measurement Operation 6 Awarning To avoid damage to the Meter or to the equipment under test disconnect circuit power and discharge all high voltage capacitors before measuring diodes To avoid harms to you please do not attempt to input voltages higher than 60V DC or 30V rms AC 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 Hz VO4 UT58C or VO4 UT58A UT58B terminal and the black test lead into the COM terminal 2 Set the rotary switch to gt 7 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 e Ina 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
11. 9mm Approx 380g including holster and battery IEC61010 CAT II 1000V CATIII 600V overvoltage and double insulation standard cE 26 Model UT58A B C OPERATING MANUAL Accuracy Specifications 1 Accuracy a reading b digits guarantee for 1 year Operating temperature 18 C 28 C Relative humidity lt 75 RH A DC Voltage i A Overload Range Resolution Accuracy Protection 200mV 0 1mV 250VAC m 200V 100mV 1000V AC 1000V V 0 8 2 Remarks Input Impedance approx 10MQ B AC Voltage Overload Range Resolution Accuracy Protection 2V Am 1080613 20V 10mV 1000V AC Remarks Input Impedance approx 10MQ Frequency response 40Hz 1kHz lt 500V 40Hz 400Hz gt 500V The 2 500Hz reading is for reference Displays effective value of sine wave mean value response 27 Model UT58A B C OPERATING MANUAL Accuracy Specifications 2 C DC Current Overload Range Resolution Accuracy Protection 0 01uA T Fuse 0 5A 250V fast type 5x20mm 0 8 1 l 1 5 1 utssasc 20A 10mA 2 5 Un Fused Remarks At20A Range For continuous measurement lt 10 seconds and interval time between 2 measurement greater than 15 minutes D AC Current Range Resolution Accuracy aa 1 0 3 Fuse 0 5A 250V 200mA 0 1mA 1 89 fast type pena Dim a pala
12. FA Remarks l Frequency reaponse 40Hz 400Hz l At 20A Range For continuous measurement 10 seconds and interval time between 2 measurement greater than 15 minutes 28 Accuracy Specificatio E Resistance Model Model UT58A B C OPERATING MANUAL ns 3 Overload Accuracy Protection UT58ABC 0 8 3 Test Lead Short Circuit Resistance Range Resolution 2009 utseasc 2kQ 20k0 250V AC 0 8 1 urssasc 2MQ 1kQ UT58ABC 20MQ 10kQ 1 0 2 UT58AB 200MQ 100kO 5 reading 10 10 F Diodes Test Range Resolution Overload Protection 1mV 250V AC Remarks e A good silicon junction drops between 0 5V 0 8V e Open circuit voltage approx 3V G Continuity Test Range Resolution Remarks A Open circuit voltage approx 3V The buzzer does not sound if the resistance of a circuit under test is gt 70Q The buzzer sounds continuously if the circuit is in good condition with resistance value lt 10Q 29 Model UT58A B C OPERATING MANUAL Accuracy Specifications 4 H Capacitance Accuracy daidi 5 0 4 When it is240uF the obtained reading is only for reference 100uF 0 1uF Remarks e Testing frequency approx 400Hz e Overload protection CE Version Fuse 5x20mm F 0 5A 250V I Temperature UT58B UT58C only Range Resolution Accuracy 40 0 C 3 7 C Ye 0 400 C 1 3 4
13. e reading 5 Test of diode 6 A The continuity buzzer is on 7 Date hold is active 8 A Indicator of connecting test leads into different input terminals Connect Terminal Model UT58A B C OPERATING MANUAL Display Symbols 2 see figure 2 No Symbol Meaning Q kQ MQ Q Ohm The unit of resistance kQ kilohm 1 x 10 or 1000 ohms MQ Megaohm 1 x 10 or 1 000 000 ohms mV V V Volts The unit of voltage mV Millivolt 1 x 10 or 0 001 volts LF nF F Farad The unit of capacitance uF Microfarad 1 x 10 or 0 000001 farads nF Nanofarad 1 x 10 or 0 000000001 farads A Ampana amps The unit of rrent mA Miliamp 1x10 or 0 001 LA mA A amperes uA Microamp 1x 10 or 0 000001 amperes C Centigrade temperature kHz The unit of frequency in cycles second Kilohertz 1 x 10 or 1 000 hertz Model UT58A B C OPERATING MANUAL Measurement Operation 1 A DC and AC Voltage Measurement see figure 3 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 although readings may be obtained The DC Voltage ranges are 200mV 2V 20V 200V and 1000V The AC Voltage ranges are 2V 20V 200V and 750V To measure DC or AC Voltage connect the Meter as follows 1 Insert the red test lead into the HzVQ UT58C or VQ UT58A
14. low battery the Meter might produce false readings that can lead to electric shock and personal injury Remove test leads test clips 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 UT58A B C OPERATING MANUAL International Electrical Symbols AC Alternating Current DC Direct Current Grounding Double Insulated Deficiency of Built In Battery Warning Refer to the Operating Manual Conforms to Standards of European Union Model UT58A B C OPERATING MANUAL The Meter Structure see figure 1 figure 1 LCD Display HOLD Button Rotary Switch Input Terminals POWER CENENE
15. multi purpose socket from the input terminal G Temperature Measurement UT58B UT58C only see figure 9 figure 9 N warning To avoid harm to you or damages to the Meter do not attempt to input voltages higher than 60V in DC or 30V rms in AC although readings may be obtained During testing the operating temperature must be within 18 23 C otherwise the obtained reading may not be correct especially measuring low temperature The temperature measurement range is from 40 C 1000 C To measure temperature connect the Meter as follows 1 Insert the multi purpose socket into the HZVQ HUT58C or VQ UT58B and MA terminal 22 Model UT58A B C OPERATING MANUAL Measurement Operation 10 2 Set the rotary switch to C The LCD will display 1 at this moment 3 Insertthe temperature probe into the corresponding jack of the multi purpose socket The LCD displays the room temperature at this moment 4 Place the temperature probe s tip to the object being measured The measured value of the object being measured shows on the display after few seconds Note When temperature measeuremnet has been completed remove the temperature probe from the multi purpose socket and remove the multi purpose socket from the Meter Measuring Transistor see figure 8 ja To avoid harms to you please do not attempt to input voltages higher than 60V DC or 30V rms AC To measure transistor connect the Meter a
16. n continuity testing has been completed disconnect the connection between the testing leads and the circuit under test F Capacitance Measurement see figure 8 figure 8 ZA warning To avoid damage to the Meter or to the eguipment 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 To avoid harms to you please do not attempt to input voltages higher than 60V DC or 30V rms AC Capacitance measurement has 3 measurement positions on the rotary switch 2nF 200nF and 100uF To measure capacitance connect the Meter as follows 1 Insert the multi purpose socket into the Hz VO UT58C or VO UT58A UT58B and pAmA UT58A or mA UT58B UT58C terminal 2 Set the rotary switch to an appropriate measurement position in4EF range 3 Insert the capacitor to be tested into the corresponding jack of the multi purpose socket The measured value shows on the display 21 Model UT58A B C OPERATING MANUAL Measurement Operation 9 Note 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 should be as short as possible e Itis normal to take a longer time when testing a gt 10uF high capacitor value When capacitance testing has been completed remove the
17. on 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 ranges are Model UT58A UT58B 20uA 2mA 20mA 200mA and 20A Model UT58C 2mA 200mA 20A The AC Current ranges are 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 A or AmA UT58A or mA UT58B UT58C terminal and the black test lead into the COM terminal 3 Set the rotary switch to an appropriate measurement position in A or A 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 e fthe value of current to be measured is unknown use the maximum measurement position and reduce the range step by step until a satisfactory reading is obtained e For safety sake the measuring time for high current gt 10A should be less than 10 seconds and the interval time between 2 measurements should be greater than 15 minutes When current measurement has been completed disconnect the connection between the testing leads and the circuit under test 16 Model UT58A B C OPERATING MANUAL Measurement Operation 4 C Measuring Resistance see figure 5
18. only Maintenance amp A General Services B Replacing the Fuses qua C Replacing the Battery _ _ _ 31 32 32 32 33 Model UT58A B C OPERATING MANUAL Overview Awarning To avoid electric shock or personal injury read the Safety Information and Rules for Safety Operation carefully before using the Meter Digital Multimeters Model UT58A UT58B and UT58C hereafter referred to as the Meter are 3 1 2 digits with ex large LCD steady operations fashionable structure and highly reliable hand held measuring instrument The Meter uses large scale of integrated circuit and has full range overload protection The Meter not only can measure AC DC Voltage AC DC Current Resistance Capacitance Temperature Frequency Transistor Diode and Continuity but also have Data Hold Full Icon Display Overload Protection and Sleep Mode features Model UT58A B C 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 Item Description Qty 1 English Operating Manual 1 piece 2 Test Lead 1 pair 3 Multi Purpose Socket 1 piece 4 Point Contact Temperature Probe 1 piece UT58B UT58C only 5 9V Battery NEDA 1604 6F22 or 009P 1 piece In the event you find any missing or damage please contact
19. ound 15 minutes To activate the Meter press POWER for two times 24 Model UT58A B C OPERATING MANUAL Operation of Hold Mode A warning To avoid possibility of electric shock do not use Hold mode to determine if circuits are without power The Hold mode will not capture unstable or noisy readings To use the Hold mode as follows Press HOLD to enter Hold mode Press HOLD again to exit Hold mode e In Hold mode Mis displayed 25 Model UT58A B C OPERATING MANUAL General Specifications Maximum Voltage or Current between input Terminals and Grounding According to different functional input protection value l Fused Protection for 1 AMA Input Terminal Maximum Display Range Polarity display Overloading Battery Deficiency Temperature Operating Storage Relative Humidity l Electromagnetic Compatibility l Battery Type Dimensions Weight l Safety Compliances Il Certificate CE Version 0 5A 250V fast type 5x20mm 1999 updates 2 3 times second Manual ranging Automatically Display 1 Display EA 0 C 40 C 32 F 104 F 10 C 50 C 14 F 122 F lt 75 0 C 30 C lt 50 30 C 40 C In a radio field of 1 V m Overall Accuracy Specified Accuracy 5 of Range in a radio field of more than 1 V m no assigned accuracy is specified One piece of 9V NEDA1604 or 6F22 or 006P 179x88x3
20. s follows 1 Insert the multi purpose socket into the Hz VQ UT58C or VO UT58A UT58B and AmA UT58A or mA UT58B UT58C terminal 2 Set the rotary switch to hFE 3 Insert the NPN or PNP type transistor to be tested into the corresponding jack of the multi purpose socket 4 The measured nearest transistor value shows on the display Note When transistor measeurement has been completed remove the multi purpose socket from the input terminal 23 Model UT58A B C OPERATING MANUAL Measurement Operation 11 l Frequency Measurement UT58C only see figure 9 A warning To avoid harm to you do not attempt to input the tested freguency voltages higher than 30V rms The freguency measurement ranges are 2kHz and 20kHz To measure freguency connect the Meter as follows 1 Insert the red test lead into the Hz VO terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in Hz range 3 Parallel connect the test leads across with the object being measured The measured value shows on the display Note e The testing condition is as follows 50mV rms lt input amplitude 30V rms When Hz measurement has been completed disconnect the connection between the testing leads and the circuit under test Sleep Mode To preserve battery life the Meter automatically turns off if you do not turn the rotary switch or press any button for ar
21. the terminals Remove the holster from the Meter Remove the 3 screws from the case bottom and separate the case top from the case bottom Remove the battery from the battery connector Replace with a new 9V battery NEDA1604 6F22 or 006P Rejoin the case bottom and case top and reinstall the 3 screws and the holster 33 Model UT58A B C OPERATING MANUAL END This operating manual is subject to change without notice LINI T Model UT58A B C OPERATING MANUAL 35 Model UT58A B C OPERATING MANUAL Copyright 2001 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 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
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