Uni-Trend UT51 multimeter
Contents
1. Model UT51 55 OPERATING MANUAL A Input sensitivity lt 100mVrms Overload protection 250Vrms B 8 Temperature Range Comment Measuring Condition Display diode forward Forward DC current abt voltage near value 1mABackward DC voltage Unit mV abt 2 8V Beeper sounds if Continuity Voltage at open circuit Resistance lt 709 Display abt 2 8V near value Unit Q A Overload protection 250V DC or AC RMS B 10 Transistor hFE test Measuring Condition Can measure NPN or Basic polarity current abt hFE PNP transistor hFE Range 0 10008 10uA Vce abt 2 8V Model UT51 55 OPERATING MANUAL C Making Measurements Caution 1 If there is no display or Ea is shown on the LCD when the Meter is switched on replace the battery ASAP 2 Never exceed the maximum input voltage or current limits shown besides the input jacks A otherwise the Meter will be damaged and this is dangerous to life 3 Turn the rotary switch to proper range before operating On Off Switch Capacitance jack Liquid Crystal Display Temperature jack Rotary switch Transistor jack Input jack 10 Model UT51 55 OPERATING MANUAL C 1 Measuring DC Voltage 1 Connect the black test lead to COM jack and red test lead to V jack 2 Set the rotary switch to V 3 Connect the test leads across with the object to be measured LCD appears the2. Model UT51 55 OPERATING MANUAL Contents A Your Meters Feature B Specifications C Making Measurements D Maintenance E Accessories F Using Holster G Using Strap Introduction One kind of UNI T brand new UT50 series Multimeters is a 3 1 2 digit with steady function 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 can measure DC current AC current DC Voltage AC Voltage Resistance Capacitance Diode Temperature Frequency and Continuity which is an ideal tool for users Model UT51 55 OPERATING MANUAL Safety Rules The UNI T UT50 series comply with IEC 61010 in pollution degree 2 overvoltage category CAT 1000V and CAT Il 600V and double insulation Use the Meter only as specified in this manual otherwise the protection provided by the Meter may be impaired CAT I For signal level telecommunication electronic with small transient over voltage CAT II For local level appliances main wall outlets portable equipment The meter is designed to withstand the stated Max voltages If it s not possible to exclude without doubts that impulses transients disturbance or for other reasons these voltages are exceeded a suitable prescale 10 1 must be used Do not operate the Meter before the cabinet has been closed and screwed safely as terminal can carr
3. Fax 852 2950 9303 Email infoQuni trend com http www uni trend com 20
4. measuring value and also the polarity of the red test lead A Caution 1 If magnitude of the voltage is unknown always start with the highest range and reduce until satisfactory reading is obtained 2 If 1 is shown on the LCD which means the Meter is overloaded then set the measuring range to higher 3 AY means never exceed the maximum input limits 1000V otherwise internal circuit of the Meter will be damaged 4 Take extra care of voltage leakage when measuring high voltage C 2 Measuring AC Voltage 1 Connect the black test lead to COM jack and red test lead to V jack 2 Set the rotary switch to V 3 Connect the test leads across with the object to be measured A caution 1 Refer to DC Voltage Caution 1 2 4 2 A means never exceed the maximum input limit 750V otherwise internal circuit of the Meter will be damaged 11 Model UT51 55 OPERATING MANUAL C 3 Measuring DC Current di Connect the black test lead to COM jack When measuring 200mA UT51 is 2A or below connect the red test lead to mA jack When measuring 20A 10A or below connect the red test lead to A jack Set the rotary switch to A Connect the test leads in series with the object to be measured the LCD display the measuring value and polarity of red test lead Caution 1 2 3 If magnitude of the current is unknown always start with the highest range and reduce until
5. satisfactory reading is obtained 11 is shown on the LCD which means the Meter is overloaded then set the measuring range to higher A means never exceed the maximum input limit 200mV UT51 is 2A otherwise will cause the burn of fuse 20A range does not have fuse protection while UT51 at 10A range has C 4 Measuring AC Current 1 Connect the black test lead to COM jack When measuring 200mA UT51 is 2A or below connect the red test lead to mA jack When measuring 20A 10A connect the red test lead to A jack 2 Set the rotary switch to A 3 Connect the test leads in series with the object to be measured A caution 1 Please refer to DC Current Caution 1 2 3 12 Model UT51 55 OPERATING MANUAL C 5 Measuring Resistance 1 Connect the black test lead to COM jack and red test lead Q jack 2 Set rotary switch to 0 3 Connect the test leads across with the object to be measured A Caution 1 111 is shown on the LCD which means the Meter is overloaded then set a higher measuring range If resistance is above 1MQ the reading will only be steady after few seconds which is normal for measuring high value of resistance 2 1 is displayed when open circuit or no input 3 Make sure all objects circuit and components to be measured are without voltage 4 200M9 short circuit has 10 digits which need to be deducted after the reading when making measuremen
6. screw and rubber feet Replacement of fuses is seldom required Burning of a fuse always results from the improper operation Accessories A book of users manual Apair of test lead A pair of WRN 01B bread temperature probe for UT53 and UT55 ONLY A piece of holster if selected Using Holster Three different ways to use holster 1 2 3 Set holster parallel on the table do not open the tilt stand see diagram 1 Set holster in a small angle on the table tilt it up by the first part of tilt stand see diagram 2 Set holster in a large angle on the table tilt it up by all two parts of tilt stand see diagram 3 RA figure1 figure2 figure3 Model UT51 55 OPERATING MANUAL G Using Strap 1 Put the front end of the strap through the round metal of the Meter see part 1 of the below diagram 2 Put the bottom end of the strap through the front part and tide it up see part 2 of the below diagram END The manual is subject to changes without separate notice 18 Model UT51 55 OPERATING MANUAL Model UT51 55 OPERATING MANUAL 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
7. 2A range 10A 250V fast acting fuse 5x20mm at 10A range For UT52 53 54 55 315mA 250V fast acting fuse o5x20mm No fuse at 20A range Max current input For UT51 10A The measurement time for high current should be less than 10 seconds maximum and the interval time between two measurements should be greater than 15 minutes For UT52 53 54 55 20A The measurement time for high current should be less than 15 seconds maximum and the interval time between two measurements should be greater than 15 minutes Measuring voltage drop Full range is 200mV Display Average Value RMS of Sine Wave Model UT51 55 OPERATING MANUAL B 5 Resistance Range Resolution Accuracy UT51 UT 52 UT53 UT54 UT55 2002 0 19 0 8 3 2KQ 19 20KQ 10Q 200KQ 1002 0 8 1 2MQ 1KQ 20MQ 10KQ H1 2 200MQ 100KQ H5 10 10 voltage at open circuit 790mV 200M2 range open circuit voltage around 3V Overload protection All ranges 250VDC or AC RMS Caution At 200MQ range as test lead is short circuit the LCD display 10 digits is normal deduct the 10 digits from the measured reading during measuring B 6 Capacitance Range Resolution Accuracy UT51 UT 52 UT53 UT54 UT55 A Testing signal around 400Hz 40mVrms B 7 Frequency Accuracy Range Resolution 711075310753 UT54 UTES 2kHz 1Hz E 2 5 20kHz 10Hz 1 5 5
8. ATING MANUAL 5 6 7 2 Turn the Meter power OFF 3 4 Remove rubber feet and screws from the case Remove the holster from the Meter bottom and separate the case bottom from the case top Remove the battery from the battery compartment Replace the battery with a new 9V battery NEDA 1604 or 6F22 or 006P Rejoin the case bottom and case top and install the screws and rubber feet lll Replacing the Fuses Caution 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 i 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 power 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 and make sure the fuse is fixed firmly in the bracket UT51 2A 250V fast acting fuse o5x20mm below 2A range 10A 250V fast acting fuse o65x20mm at 10A range 16 VN m F Model UT51 55 OPERATING MANUAL UT52 53 54 55 315mA 250V fast acting fuse 5x20mm Rejoin the case bottom and the case top and install the
9. FE 1 Set rotary switch to hFE 2 Identify NPN or PNP connect objects to the correspondent transistor jack 3 LCD displays measuring value 4 Measuring condition Ib 10pA Vce 2 8V 14 Model UT51 55 OPERATING MANUAL C 11Auto Power Off function Only for 53 54 55 1 The Meter equips with auto power off function Itwill be in a sleep condition once it has worked abt 15 minutes which only consume 7uA current during that time 2 Press the on off switch two times to power up again D Maintenance I General Service The Meter is a highly precise electrical testing instrument do not attempt to change the circuit of your Meter on your own Take a note of the following few points 1 Do not input to DC Voltage above 1000V or AC above 750V RMS 2 Do not input Voltage when the rotary switch is in Current Range OH and 3 Do not operate the Meter if battery is not inside the Meter or bottom cabinet is not securely screwed 4 Disconnect the test leads and power off the Meter before replacing the Battery and Fuses ll Replacing the Battery A caution 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 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 Model UT51 55 OPER
10. load protection 200mV is 250VDC or AC RMS All other ranges is 750Vrms or 1000Vp p B 2 Alternating Current Voltage AC Voltage F Accuracy UT51 UT 52JUT53JUT54 200mV 100uV 1 2 3 200V_ 100mV 750V 1V 1 2 3 AA Input impedance All ranges are 10Mo Frequency 40Hz 400Hz Overload protection 200mV is 250VDC or AC RMS All other ranges is 750Vrms or 1000Vp p Display Average Value RMS of Sine Wave Model UT51 55 OPERATING MANUAL B 3 Direct Current Current DC Current 0 8 1 2 goa Oma pees 12755 A Overload protection For UT51 2A 250V fast acting fuse 5x20mm below 2A range 10A 250V fast acting fuse p5x20mm at 10A range For UT52 53 54 55 315mA 250V fast acting fuse 5x20mm No fuse at 20A range Max current input For UT51 10A The measurement time for high current should be less than 10 seconds maximum and the interval time between two measurements should be greater than 15 minutes For UT52 53 54 55 20A The measurement time for high current should be less than 15 seconds maximum and the interval time between two measurements should be greater than 15 minutes Model UT51 55 OPERATING MANUAL B 4 Alternating Current Current AC Current Accuracy Range Resolution 200uA 0 1UA 2mA 1UA 200mA 100 pA AA A overload protection For UT51 2A 250V fast acting fuse 65x20mm below
11. mbols EX LowBattery Earth Ground A Safety Rules E Double Insulated rw AC Diode vee DC 1 Buzzer E Fuse Dangerous Voltages Model UT51 55 OPERATING MANUAL Your Meters Feature 32 ranges Liquid Crystal Display digits height is 27mm Overload display I Maximum display 1999 3 1 2 digit Full range overload protection Auto Power Off For UT53 UT54 and UT55 ONLY Temperature Operating 0 C to 40 C 32 F to 104 F Storing 10 C to 50 C 14 F to 122 F Altitude Operating 2000m Storing 10000m Relative Humidity Max relative humidity 80 for temperature up to 31 C decreasing linearly to 50 relative humidity at 40 C Low Battery display 4 Battery Type 9V NEDA 1604 or 6F22 or 006P Strap for easy carry Tilt stand design three observation angles is in favor of reading display Dimension 190mm x 88mm x 34mm Weight Meter only excluding test leads about 270g Meter holster tilt stand about 550g Model UT51 55 OPERATING MANUAL B Specifications Accuracy is specified for one year after calibration at operating temperatures 23 C 5 C with relative humidity at lt 75 Accuracy specifications take the form of a readings digits B 1Direct Current Voltage DC Voltage Accuracy UT51 UT 52 UT53 UT54 UT55 0 5 1 0 8 2 A Input impedance All ranges are 10M2 Over
12. t For example when measuring 100M9 it displays 101 0 10 digits need to be deducted C 6 Measuring Capacitance Before measuring capacitance remember it takes time for zeroing when changing ranges Floating reading does not effect accuracy 1 To avoid damage of the Meter or the equipment under testing disconnect circuit powers and discharge capacitors before measuring capacitance 2 Connect capacitor to the capacitance jack 3 Stabilizing reading takes some time when measuring high capacitance 4 Unit 1pF 10 uF 1nF 10 F 13 Model UT51 55 OPERATING MANUAL C 7 Measuring Frequency 1 Connect red test lead to HZ jack and black test lead to COM jack 2 Set the rotary switch to kHZ 3 Connect the test leads across with the obje being measured LCD appears the measurin value C 8 Measuring Temperature Connect one end of the bread temperature probe to the Meter and the other end to top or inside of the object being measured LCD displays the measuring value with unit as C C 9 Measuring Diode and Continuity beeper 1 Connect the black test lead to COM jack and red test lead to V jack 2 Set the rotary switch to n 3 Connect the test lead across with the object being measured LCD appears the measuring value 4 Connect the test lead to two ends of the object being measured the beeper sounds if the resistant value between the two ends is less than 700 C 10 Measuring Transistor h
13. y voltage Make sure before each measurement the Meter is set to the suitable range Before using the Meter please inspect the cabinet and test leads for damaged insulation or exposed metal Connect the red and black test lead to the correct measuring input jack properly Do not input values over the maximum range of each measurement to avoid damages of the Meter Do not turn the rotary function switch during Voltage and Current measurement otherwise the Meter could be destroyed Model UT51 55 OPERATING MANUAL Make sure to use new fuses with proper rating in stead of bad fuses To avoid electric shock or damages do not apply more than 1000V between the COM terminals and earth ground Use caution when working with Voltages above 60V DC or 30Vrms AC These Voltages pose shock hazard Replace the battery as soon as the battery indicator 4 appears With a low battery the Meter might produce false readings that can lead to electric shock and personal injury Turn off the Meter once finished measuring fetch out the battery when the meter will not be used for long period Do not operate the Meter under adverse environmental condition especially humid area To avoid damages and dangerous do not change the circuit Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents The Meter is suitable for indoor use only International Electrical Sy
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