Uni-Trend UT118B multimeter
Contents
1. UT1 1 8A B Pen Type Meters Operating Manual Overview This Operating Manual covers information on safety and cautions Please read the relevant information carefully and observe all the Warnings and Notes strictly AN Warning To avoid electric shock or personal injury read the Safety Information and Rules for Safe Operation carefully before using the Meter The Model UT118A and UT118B hereafter referred to as the Meter are 3000 counts pen type digits millimeters The Meter uses large scale of integrated circuit with professional multimeter IC as its core and has full range overload protection The Meter measures or tests the following e AC DC voltage EF Function UT118B only Resistance Diode Continuity Capacitance 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 Qy English Operating Manual Test Lead 1 pair In the event you find any missing or damage please contact your dealer immediately Safety Information This Meter complies with standards EN61010 in pollution degree 2 over voltage category CATIII 300V and double insulation CATIII Distribution level fixed installation with smaller transient over voltages 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 iden2. ction Remark Input Impedance 210MQ 300Vrms C EF Test UT18B Only Range lt 10mm buzzer beeps 220V 50H 10 50mm may and may not beeps gt 50mm Buzzer not sound D Resistance 300Vrms ea Remark Under auto scan mode the max range is 3MQ UT118A B Operating Manual l INI F E Continuity Measurement Remark Open Circuit Voltage around 1 2V Buzzer beeps at resistance lt 100 Buzzer not sound when resistance gt 700 F Diodes Measurement Overload Protection 300Vrms Remark Open Circuit Voltage around 3V Displays approximate forward voltage drop G Capacitance ange Resolution Accuracy Overload Protection nF 0 001nF OnF 0 01nF OOnF 0 1nF 3 5 300Vrms UF 1nF OuF 10nF OOUF 100nF Remarks 1 Under auto scan mode the max range is 300uF 2 There is a residual reading when the circuit is open To measure a small value of capacitance subtract it to ensure accuracy Maintenance see figure 4 This section provides basic maintenance information and battery replacement instruction Figure 4 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 e Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or
3. d 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 7 Continuity Test Warning To avoid damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before continuity test To measure resistance do the following e Sethe rotary switch to Q gt H 4 e Press SELECT to select measurement mode e Connect the test leads across with the object being measured e The buzzer sounds continuously if the resistance of a circuit under test is lt 30Q it indicates the circuit is in good connection Note When continuity measurement has been completed 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 8 Diodes Test 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 diodes To measure diode do the following e Sethe rotary switch toQ gt F 4 e Press SELECT to select measurement mode e For better accuracy it better separate the object being measured from the circuit before measurement e When diodes measurement has been completed disconnect the connection between the testing leads and the circuit under test 9 Capacitance Measurement War
4. e AN 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 Minimum reading 10 Maximum reading 11 The unit of Capacitance 12 Test of diode 13 The continuity buzzer is on 14 V Volts The unit of voltage mV Millivolt 1x10 or 0 001 volts 15 Q Ohm The unit of resistance kQ kilohm 1x10 or 1000 ohms MQ Megaohm 1x10 or 1 000 000 ohms Button function and auto power off 1 SELECT Press SELECT to switch between resistance AC DC voltage continuity buzzer and diode measurement modes Press and hold more than 2 seconds in or exit sleep mode UT118A B Operating Manual LINIJ 2 HOLD Press HOLD to enter and exit hold mode except under auto scan mode Press and hold the HOLD button more than 2 seconds the meter automatically holds the value which obtains at 6 seconds later at this time J is displayed and flickering If enter sleep mode under hold mode the meter still in the hold mode when it be turned on 3 MAX MIN The MAX MIN mode stores minimum MIN and maximum MAX input values except under auto scan mode Manual ranging comes when you select this function Press MAX MIN button MAX MIN gt MAXMIN and vice versa Under hold mode and max min mode should exit hold mode first then press and hold MAX MIN more than 1 second to exit max min mode 4 3 Display Back
5. light and test lead light button Press once to turn the display backlight and test lead light on and press again to turn the display backlight and test lead light off It will automatically off after around 1 minute 5 AUTO POWER OFF To preserve battery life the Meter automatically goes into a sleep mode if you do not press any button for around 10 minutes The Meter can be activated by pressing any button then returns to the display for the function selected previously 6 BUZZER The buzzer phonate go with every time button be effectual pressed When the meter will auto power off in 20 seconds the buzzer beeps three times Before power off there will be a long time buzzer beeps Measurement Operation Before measurement anticlockwise circumgyrate the red cover and rock the input terminal When all themeasurement has been completed deasil circumgyrate the red cover then hide the input terminal see figure 3 t O O Figure 3 1 AC DC Voltage auto Measurement Warning To avoid harm to the Meter never input higher than 300V voltage although it is possible to measure higher voltage To measure Voltage connect the Meter as follows e Set the switch to V7 e Auto measuremeng mode is a default Under this mode can measure AC voltage and DC voltage e Connect the test leads across with the object being measured The measured value shows on the display e When voltage measurement has been completed disconnec
6. ning 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 To measure capacitance connect the Meter as follows e Sethe rotary switch to Q gt F 4 e Press SELECT to select 4 measurement mode e For better accuracy it better separate the object being measured from the circuit before measurement e When diodes measurement has been completed disconnect the connection between the testing leads and the circuit under test General Specifications e Maximum voltage between red Terminals and Grounding 300Vrms e Maximum Display 3000 Updates 4 times second e Temperature Operating 0 C 40 C 32 F 104 T Storage 10 C 50 C 14 F 122 F e Relative Humidity lt 75 0 C 30 C lt 50 31 C 40 C e Altitude Operating 2000m Storage 10000m e Battery Type 3V Li MnO2 Button cell battery e Battery Deficiency Display 2 e Dimensions HxWxL 20 18x26 5x181 5mm e Weight Approx 90g battery included Accuracy Specifications Accuracy a reading b digits guarantee for 1 year Operating temperature 18 C 28 C Relative humidity lt 75 A AC Voltage Accuracy Overload Protection 0 001V 0 01V 300Vrms Remark Input Impedance 210MQ Frequency Response 40Hz 400Hz 1 4 B DC Voltage Accuracy Overload Prote
7. readings that can lead to electric shock and personal injury e When servicing the Meter use only the same model or identical electrical specifications replacement parts e The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident e 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 e 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 International Electrical Symbols Deficiency of Built In Battery I EE DC Direct Current o Continuity Test ce contorms to Standards of European The Meter Structure see figure 1 rw C Alternative Current ji ee 6 O me b oc 5 1 2 3 4 5 Figure 1 2 Functional buttons 4 LCD Display Front Housing Switch 5 Input Terminals w Display Symbols see figure 2 sps ay he F 3 5 6 Ul Ly LL Sa 1 l 2 ees es A F Figure 2 Indicates auto scan mode High voltage indicator Data hold is active Indicates negative reading The meter is in the autorange mode Indicator for AC voltage Indicator for DC voltage The battery is low oo oot e
8. solvents e To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings e Turn the Meter off when it is not use and take out the battery when not using for a long time e Do not store the Meter in a place of humidity high temperature explosive inflammable and strong magnetic field 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 Turn the Meter off 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 Remove the screw from battery compartment and separate the battery compartment from the case bottom Remove the battery from the battery compartment Replace the battery with a new 3V battery Rejoin the case bottom and the battery compartment and reinstall the screw UNI TREND GROUP LIMITED Rm 901 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 Awww uni trend com o B Manufacturer Uni Trend Technology Dongguan Limited Address Dong Fang Da Dao Bei Zha Dong Fang Industrial Development District Hu Men Town Dong Guan City Guang Dong Province China
9. t the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminal of the meter Note The threshold voltage of AC voltage is around 400mV 2 DC Voltage Measurement AN Warning To avoid harm to the Meter never input higher than 300V voltage although it is possible to measure higher voltage e Set the switch to VA e Press SELECT to select DC voltage measurement mode e Connect the test leads across with the object being measured The measured value shows on the display e When voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminal of the meter 3 AC Voltage Measurement Warning To avoid harm to the Meter never input higher than 300V voltage although it is possible to measure higher voltage e Set the switch to V e Press SELECT to select AC voltage measurement mode e Connect the test leads across with the object being measured The measured value shows on the display e When voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminal of the meter Note The threshold voltage of AC voltage is around 400mV 4 EF Measurement UT118B only Warning To avoid harm to the Meter never input higher than 300V vol
10. tage although it is possible to measure higher voltage e Set the switch to V SEF and remove the test lead from the input terminal e Press SELECT to select EF measurement mode e Unconnected measurement Place the red terminals towards the object being measured 5 gt 4 auto measurement N Warning To avoid damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measurement e Set the switch to Q gt H 4 e Auto measuremeng mode is a default under this mode can measure Resistance Diode Continuity and Capacitance automatically e For better accuracy it better separate the object being measured from the circuit before measurement e When voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test Note Under auto measurement mode when input Resistance lt 15Q or gt 10MQ Capacitance lt 400pF or gt 1mF Will get an irresponsible value 6 Resistance Measurement 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 do the following e Sethe rotary switch to Q gt F 4 e Press SELECT to select Q measurement mode e Connect the test leads across with the object being measured e When resistance measurement has been complete
11. tifies 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 Rules For Safe Operation 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 e 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 e Inspect the test leads for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads with identical model number or electrical specifications before using the Meter e When using the test leads keep your fingers behind the finger guards e Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and grounding e When the Meter working at an effective voltage over 60V DC or 30V AC special care should be taken for there is danger of electric shock e Use the proper function and range for your measurements e Disconnect circuit power and discharge all high voltage capacitors before testing current resistance diodes or continuity e Replace the battery as soon as the battery indicator appears With a low battery the Meter might produce false
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