UNI-T UT50D, Operating Manual

Page 1: ...uring Resistance F Inductance Measurement G Capacitance Measurement H Temperature Measurement I Measuring Diodes Continuity Sleep Mode Turning on the Auto Display Backlight General Specifications Accuracy Specifications A DC Voltage B AC Voltage C DC Current D AC Current E Resistance Test F Inductance G Capacitance H Temperature I Diodes and Continuity Test Table of Contents 3 10 4 11 13 13 15 16 ...

Page 2: ...33 33 33 34 Maintenance A General Service B Replacing the Battery C Replacing the Fuses Model UT50D OPERATING MANUAL 2 ...

Page 3: ...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 Warning To avoid electric shoc...

Page 4: ... Clip 1 piece 4 Point Contact Temperature Probe 5 9V Battery NEDA 1604 6F22 or 009P installed inside the Meter 1 piece 1 piece Item Description Qty In the event you find any missing or damage please contact your dealer immediately 4 Model UT50D OPERATING MANUAL ...

Page 5: ...n 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 electri...

Page 6: ...n 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 tem...

Page 7: ...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 corr...

Page 8: ...lternating Current DC Direct Current Grounding Double Insulated Deficiency of Built In Battery Warning Refer to the Operating Manual Conforms to Standards of European Union Diode AC or DC Fuse Continuity Test Model UT50D OPERATING MANUAL 8 ...

Page 9: ...e 1 The Meter Structure see figure 1 1 LCD Display 2 Data Hold Button 3 Rotary Switch 4 Other Input Terminals 5 COM Input Terminal 6 20A Input Terminal 7 mA Input terminal 8 Power Model UT50D OPERATING MANUAL ...

Page 10: ...to turn off the Meter HOLD Blue Button l Press HOLD once to enter hold mode l Press HOLD again to exit hold mode l In Hold mode is displayed and the present value is shown POWER Yellow Button Functional Buttons Below table indicated for information about the functional button operations Model UT50D OPERATING MANUAL 10 ...

Page 11: ...eplace the battery as soon as the battery indicator appears 3 Indicator for AC voltage or current The displayed value is the mean value 4 Indicates negative reading 5 Test of diode 6 Data hold is active 7 The continuity buzzer is on 8 Centigrade temperature o C o F 9 Fahrenheit temperature 10 V Volts The unit of voltage mV Millivolt 1 x 10 3 or 0 001 volts mV V 11 Model UT50D OPERATING MANUAL 11 ...

Page 12: ...No Symbol Meaning 12 mH H 13 14 H Henry The unit of Inductance mH Millihenry 1 x 10 3 or 0 001 henry Display Symbols 2 see figure 2 12 Model UT50D OPERATING MANUAL ...

Page 13: ...isplay is not on otherwise false readings may be provided Pay extra attention to the symbol which is located besides the input terminals of the Meter before carrying out measeurement l l l figure 3 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 ...

Page 14: ...edance of approx 10M This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10k the error is negligible 0 1 or less l When DC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test 1 Insert the red test lead into thei V nput terminal and the black test lead into the...

Page 15: ...er has an input impedance of approx 10M This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10k the error is negligible 0 1 or less l When AC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test 1 Insert the red test lead into the V terminal and the black test ...

Page 16: ...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 A range Model UT50D OPERATING MANUAL 16 ...

Page 17: ...wer to the circuit The measured value shows on the display l 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 l When current measurement has been completed disconnect the connection between the testing leads and the circuit under test figure 4 Model UT50D OPERATING ...

Page 18: ... in 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 l 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...

Page 19: ...d into the COM terminal 2 Set the rotary switch to an appropriate measurement position in range 3 Connect the test leads across with the object being measured The measured value shows on the display l The test leads can add 0 1 to0 3 of error when measuring low resistance that is the range of 200 To obtain precision readings in low resistance use the following equation Model UT50D OPERATING MANUAL...

Page 20: ... there is no input for example in open circuit condition the Meter displays 1 l When resistance measurement has been completed disconnect the connection between the testing leads and the circuit under test Measurement Operation 8 figure 6 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 O...

Page 21: ...ip to the object being measured The measured value shows on the display Measurement Operation 9 l 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 l When inductance testing has been completed remove the multi purpose socket or test clip from the input terminal and remove multi purpos...

Page 22: ... To minimize the measurement error caused by the distributed capacitor the testing lead or testing clip should be as short as possible l 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 l It is normal to take a while for zeroing when changing over the measuremen...

Page 23: ...terminal 2 Set the rotary switch to 3 Place the temperature probe to the object being measured The measured value shows on the display l The Meter automatically displays the temperature value inside the Meter when there is no temperature probe connection l The included temperature probe can only be measured up to 250 For any mesaurement higher than that the rod type temperature probe must be used ...

Page 24: ...des 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 V terminal and the black test lead into the COM terminal Model UT50D OPERATIN...

Page 25: ...roper 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 l When diode testing has been completed disconnect the connection between the testing leads and the circuit under test To test for continuity connect the Meter as below 1 Insert the red test lead i...

Page 26: ...ndicating the circuit being tested is open l When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test Measurement Operation 14 Model UT50D OPERATING MANUAL 26 ...

Page 27: ...consumes around 10µA 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 automati...

Page 28: ...mperature Operating 0 o C 40 o C 32 o F 104 o F Storage 10 o C 50 o C 14 o F 122 o F l Relative Humidity 75 0 o C 30 o C 50 31 o C 40 o C l Altitude Operating 2000m Storage 10000m l Battery Type 9V NEDA1604 or 6F22 or 006P l Battery Deficiency Display l Data Holding Display H l Negative reading Display l Overloading Display 1 l Dimensions HxWxL 165x80x38 3mm l Weight Approx 275g battery included l...

Page 29: ... 750V ACrms B AC Voltage Range Resolution 0 8 3 Overload Protection Accuracy 2V 20V 200V 750V 0 001V 0 01V 0 1V 1V 1 2 3 250V DC orAC rms 1000V DC 750V ACrms 29 Model UT50D OPERATING MANUAL Accuracy a reading b digits Operating temperature 23 o C 5 o C Relative humidity 75 Temperature coefficient 0 1 x specified accuracy 1 o C guarantee for 1 year ...

Page 30: ...d interval not less than 15 minutes l Measurement voltage drop Full range at 200mV l Frequency reaponse 40Hz 400Hz l Display effective value of sine wave mean value response Range Resolution Overload Protection Accuracy 20mA 200mA 20A 0 01mA 0 1mA 10mA 0 5A 250V fast type fuse 5x20mm 1 3 Un Fused 1 8 3 3 5 C DC Current Range Resolution Overload Protection Accuracy 2mA 200mA 20A 0 001mA 0 1mA 10mA ...

Page 31: ...200mH 20H 250V rms 10pF 100pF 1nF 100nF Range Resolution Overload Protection Accuracy 250V rms 31 Model UT50D OPERATING MANUAL l At 200 range 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 2 10 3 10 2 5 5 5 4 ...

Page 32: ...otection Accuracy 40 o C 0 o C 0 o C 400 o C 400 o C 1000 o C 1 3 1 o C 2 5 250V rms Open circuit voltage approx 2 8V 250V DC or AC 70 buzzer beeps continuously Diodes Continuity Test 1mV Model UT50D OPERATING MANUAL 32 I Diodes and Continuity Test ...

Page 33: ...or damage to the Meter do not get water inside the case A General Service l 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 l Turn the Meter OFF when it is not in use and take out the battery when not using for a long time l Do not store the Met...

Page 34: ...t under test and remove the testing leads away from the input terminals of the Meter 2 Turn the Meter off 3 Remove the rubber feet and screws from the battery compartment and separate the battery compartment from the case bottom 4 Remove the battery from the battery compartment 5 Replace the battery with a new 9V battery NEDA 1604 or 6F22 or 006P 6 Rejoin the battery compartment and the case botto...

Page 35: ...and screws from the case bottom and separate the case bottom from the case top 4 Remove the fuse by gently prying one end loose and then take out the fuse from its bracket 5 Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket 0 5A 250V fast type fuse 5x20mm 6 Rejoin the case bottom and the case top and install th...

Page 36: ...n 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 Model UT50D OPERATING MANUAL 36 ...