Model UT50D: OPERATING MANUAL Table of Contents Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure Functional Buttons Display Symbols Measurement Operation A. DC Voltage Measurement B. AC Voltage Measurement C. DC Current Measurement D. AC Current Measurement E. Measuring Resistance F. Inductance Measurement G. Capacitance Measurement H. Temperature Measurement I.
Model UT50D: OPERATING MANUAL Maintenance A. General Service B. Replacing the Battery C.
Model UT50D: OPERATING MANUAL Warning To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safety Operation” carefully before using the Meter. Digital Multimeters Model UT50D (hereafter referred to as “the Meter”) is a 3 1/2 digits with steady operations, fashionable structure 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.
Model UT50D: OPERATING MANUAL Item 1 2 3 4 5 Description English Operating Manual Test Lead Test Clip Point Contact Temperature Probe 9V Battery (NEDA 1604, 6F22 or 009P) (installed inside the Meter) Qty 1 piece 1 pair 1 piece 1 piece 1 piece In the event you find any missing or damage, please contact your dealer immediately.
Model UT50D: OPERATING MANUAL Safety Information This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT. II 1000V, CAT. III 600V) and double insulation. CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient voltage overvoltages than CAT. III CAT. III: Distribution level, fixed installation, with smaller transient overvoltages than CAT.
Model UT50D: OPERATING MANUAL Rules For Safe Operation (1) 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: l 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. l Inspect the test leads for damaged insulation or exposed metal.
Model UT50D: OPERATING MANUAL Rules For Safe Operation (2) l Disconnect circuit power and discharge all high -voltage capacitors before testing resistance, continuity, diodes, capacitance or current. l Before measuring current, check the Meter’s fuses and turn off power to the circuit before connecting the Meter to the circuit. l Replace the battery as soon as the battery indicator appears. With a low battery, the Meter might produce false readings that can lead to electric shock and personal injury.
Model UT50D: 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. Diode. AC or DC. Fuse. Continuity Test. Conforms to Standards of European Union.
Model UT50D: OPERATING MANUAL The Meter Structure (see figure 1) (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.
Model UT50D: OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations Button Operation Performed Turn the Meter on and off. POWER (Yellow Button) l Press down the POWER to turn on the Meter. l Press up the POWER 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.
Model UT50D: OPERATING MANUAL Display Symbols(1) (see figure 2) (figure 2) No. Symbol 1 2 3 4 5 6 7 8 9 10 11 o C F o mV, V Meaning Dangerous Voltages. The battery is low. 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. Indicator for AC voltage or current.The displayed value is the mean value. Indicates negative reading. Test of diode. Data hold is active. The continuity buzzer is on.
Model UT50D: OPERATING MANUAL Display Symbols(2) (see figure 2) No. Symbol Meaning 12 13 mH,H H: Henry. The unit of Inductance. mH: Millihenry. 1 x 10-3 or 0.001 henry.
Model UT50D: OPERATING MANUAL l Make sure the Sleep Mode is not on if you found there is no display on the LCD after turning on the Meter. Make sure the Low Battery Display is not on, l otherwise false readings may be provided. l Pay extra attention to the symbol which is located besides the input terminals of the Meter before carrying out measeurement. (figure 3) The DC Voltage ranges are: 200mV, 2V, 20V, 200V and 1000V.
Model UT50D: OPERATING MANUAL 1. Insert the red test lead into thei V nput terminal and the black test lead into the COM input terminal. 2. Set the rotary switch to an appropriate measurement position in V range. 3. Connect the test leads across with the object being measured. The measured value shows on the display. l 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.
Model UT50D: OPERATING MANUAL The AC voltage measurement has 4 measurement positions on the rotary switch: 2V, 20V, 200V and 750V To measure AC Voltage, connect the Meter as follows: 1. Insert the red test lead into the V terminal and the black test lead into the COM terminal. 2. Set the rotary switch to an appropriate measurement position in V range. 3. Connect the test leads across with the object being measured.
Model UT50D: OPERATING MANUAL ( figure 4) The DC current measurement has 3 measurement positions on the rotary switch: 2mA, 200mA and 20A. To measure current, do the following: 1. Turn off power to the circuit. Discharge all highvoltage 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 Measurement Operation(5) 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 satisfactory reading is obtained.
Model UT50D: OPERATING MANUAL Measurement Operation(6) The AC current measurement has 3 measurement positions on the rotary switch: 20mA, 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 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. 4. Break the current path to be tested.
Model UT50D: OPERATING MANUAL Measurement Operation(7) ( figure 5) The resistance ranges are:200 ,2k ,200k ,2M ,and 20M . To measure resistance, connect the Meter as follows: 1. Insert the red test lead into the V terminal and the black test lead 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.
Model UT50D: OPERATING MANUAL Measurement Operation(8) Precision readings of resistance = Measurement displayed reading minus the short circuit value of red and black test lead. l For high resistance (>1M ), it is normal taking several seconds to obtain a stable reading. l When 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.
Model UT50D: OPERATING MANUAL Measurement Operation(9) 1. 2. 3. According to the size of the tested object’s leads, insert multi-purpose socket or test clip into the mA and V terminal. Set the rotary switch to an appropriate measurement position in HLx range. Insert the tested object into the corresponding jack of the multi-purpose socket or connect the test clip to the object being measured. The measured value shows on the display.
Model UT50D: OPERATING MANUAL Measurement Operation(10) 30V l l l l l For testing the capacitor with polarity, connect the red test lead or test clip to anode & black test lead or test clip to cathode 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 or testing clip should be as short as possible.
Model UT50D: OPERATING MANUAL Measurement Operation(11) ( figure 8) o o The temperature measurement range is from -40 C ~1000 C. To measure temperature, connect the Meter as follows: 1. Insert the red temperature into the V terminal and the black temperature probe into the COM terminal. 2. Set the rotary switch to . 3. Place the temperature probe to the object being measured. The measured value shows on the display.
Model UT50D: OPERATING MANUAL Measurement Operation(12) l When temperature measeuremnet has been completed, disconnect the connection between the testing leads and te circuit under test. ( figure 9) 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.
Model UT50D: OPERATING MANUAL Measurement Operation(13) 2. Set the rotary switch to . 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. l In a circuit, a good diode should still produce a forward voltage drop reading of 0.5V to 0.
Model UT50D: OPERATING MANUAL Measurement Operation(14) l The LCD display “1” indicating 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.
Model UT50D: OPERATING MANUAL Sleep Mode To preserve battery life, the Meter automatically turns off if you do not turn the rotary switch or press any button for around 8 minutes. At that time, the Meter 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.
Model UT50D: OPERATING MANUAL l Maximum voltage between any Terminals and Grounding :1000V rms. l Fused Protection for mA Input Terminal :0.5A, 250V fast type, 5x20mm. l Fused Protection for 20A Input Terminal :Un-fused. Range :Manual ranging. Maximum Display :1999. Mesaurement Speed :Updates 2~3 times/second. Temperature: o o o o Operating:0 C~40 C(32 F~104 F) o o o o Storage: -10 C~50 C(14 F~122 F). o o Relative Humidity : 75% @ 0 C~30 C; o o 50%@31 C~40 C.
Model UT50D: OPERATING MANUAL Accuracy: (a% reading + b digits) guarantee for 1 year. o o Operating temperature:23 C 5 C. Relative humidity:<75%. o Temperature coefficient: 0.1 x (specified accuracy) / 1 C. A. DC Voltage Range Resolution Accuracy Overload Protection 200mV 2V 20V 200V 1000V 0.1mV 0.001V 0.01V 0.1V 1V 250V DC or AC rms. (0.5%+1) 1000V DC / 750V ACrms. (0.8%+2) B. AC Voltage Range Resolution Accuracy Overload Protection 250V DC or AC rms. 2V 0.001V 20V 0.01V (0.8%+3) 1000V DC / 200V 0.
Model UT50D: OPERATING MANUAL C. DC Current Range Resolution Accuracy Overload Protection 2mA 0.001mA (0.8%+1) 0.5A. 250V fast type (1.5%+1) fuse, 5x20mm 200mA 0.1mA 20A 10mA (2%+5) Un-Fused Remarks: l At 20A Range: For continuous measurement 10 seconds and interval not less than 15 minutes. l Measurement voltage drop: Full range at 200mV. D. AC Current Range Resolution Accuracy Overload Protection (1%+3) 0.5A. 250V fast type 20mA 0.01mA (1.8%+3) fuse, 5x20mm 200mA 0.
Model UT50D: OPERATING MANUAL E. Resistance Test Range Resolution Accuracy Overload Protection (0.8%+3) (0.8%+1) 250V rms (1%+5) Remarks: 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. Range Resolution Accuracy Overload Protection 2mH 20mH 200mH 20H (2%+10) 250V rms (3%+10) Range Resolution Accuracy Overload Protection 10pF (2.
Model UT50D: OPERATING MANUAL H. Temperature Range o Resolution Accuracy Overload Protection (3%+3) (1%+3) 2.5% 250V rms o -40 C~0 C o o 0 C~400 C o o 400 C~1000 C o 1C I. Diodes and Continuity Test Diodes Open circuit voltage approx. 1mV 250V DC 2.
Model UT50D: OPERATING MANUAL This section provides basic maintenance information including battery and fuse replacement instruction. 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 l Periodically wipe the case with damp cloth and mild detergent. Do not use chemical solvent.
Model UT50D: OPERATING MANUAL 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 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. 2. Turn the Meter off 3.
Model UT50D: OPERATING MANUAL To replace the Meter’s fuse: 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. 2. Turn the Meter off. 3. Remove the rubber feet 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.
Model UT50D: OPERATING MANUAL Copyright 2003 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.
