Model UT803 OPERATING MANUAL
Model UT803: OPERATING MANUAL TABLE OF CONTENTS TITLE Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure Rotary Switch Functional Buttons Display Symbols Measurement Operation A. DC or AC Voltage Measurement B. DC or AC Current Measurement C. Measuring Resistance D. Testing for Continuity E. Testing Diodes F. Capacitance Measurement G. Frequency Measurement H. Temperature Measurement I .
Model UT803: OPERATING MANUAL TITLE POWER INPUT Switch Sleep Mode RS232 Button General Specifications Accuracy Specifications A. DC Voltage B. AC Voltage C. DC Current D. AC Current E. Resistance F. Continuity Test G. Diode Test H. Capacitance I . Frequency J. Temperature K. Transistor Maintenance A. General Service B. Replacing the Fuses C. Replacing the Battery RS232C and USB Serial Port System Requirements for Installing the UT803 Interface Program RS232C Serial Port A.
Model UT803: 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. Warning To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safety Operation” carefully before using the Meter.
Model UT803: OPERATING MANUAL Unpacking Inspection Open the package case and take out the Meter.
Model UT803: OPERATING MANUAL Safety Information This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT. I 1000V, CAT.II 600V) and double insulation. A Note identifies the information that user should pay attention on. International electrical symbols used on the Meter and in this Operating Manual are explained on page 8. CAT III: Distribution level, fixed installation, with smaller transient overvoltages than CAT.
Model UT803: OPERATING MANUAL 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: 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 UT803: OPERATING MANUAL 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. l Remove test leads, temperature probe, RS232C interface cable, USB interface cable and alligator clip from the Meter and turn the Meter power off before opening the Meter case. l When servicing the Meter, use only the same model number or identical electrical specifications replacement parts.
Model UT803: OPERATING MANUAL International Electrical Symbols AC or DC Grounding Double Insulated Warning.
Model UT803: OPERATING MANUAL The Meter Structure (see figure 1) (Figure 1) 1. LCD Display 3. Input Terminals 2. Rotary Switch 4.
Model UT803: OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions: Rotary Switch Position V Function AC and DC voltage measurement :Continuity test. :Diode test. :Resistance measurement. Capacitance test Hz 0 0 F C hFE A mA A 10 Hz :Frequency measurement. 0 F :Temperature in Fahrenheit Temperature in celsius Transistor test AC or DC current measurement range from 0.1uA to 5999uA. AC or DC current measurement range from 0.01mA to 599.9mA.
Model UT803: OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations. Button POWER LIGHT SELECT Operation Performed Turn the power on and off. Turn the display backlight on and off. l Switches between AC and DC measurement. l Switches between continuity and diode and resistance measurements l Switches between frequency and Fahrenheit temperature. HOLD Press HOLD to enter and exit the Hold mode in any mode, the Meter beeps.
Model UT803: OPERATING MANUAL Display Symbols (see figure 2) 12 5.6.
Model UT803: OPERATING MANUAL Number Symbol 1 True RMS 2 HOLD Meaning Indicator for true rms value. Data hold is active. 3 Sleep Mode feature is enabled. 4 Indicates negative reading. 5 AC Indicator for AC voltage or current. 6 DC Indicator for DC voltage or current 7 AC+DC Indicator for AC+DC measurement 8 OL 9 ,K ,M A, mA, µA The input value is too large for the selected range. :Ohm. The unit of resistance. K :kilohm. 1 x 103 or 1000 ohms. M :Megaohm.1x106 or 1,000,000 ohms.
Model UT803: OPERATING MANUAL Number Symbol 9 V, mV Meaning V : Volts. The unit of voltage. mV: Millivolt.1 x 10-3 or 0.001 volts. F, mF, F : Farad.The unit of capacitance. µF,nF mF: Millifarad.1 x 10-3 or 0.001 farads µF : Microfarad.1x10-6 or 0.000001 farads. nF : Nanofarad.1 x 10-9 or 0.000000001 farads. 0 0 C, F Centigrade temperature Temperature in Fahrenheit Hz, kHz, MHz Hz : Hertz. The unit of frequency in cycles/second. kHz : Kilohertz. 1 x 103 or 1,000 hertz. MHz: Megahertz.
Model UT803: OPERATING MANUAL Number Symbol 12 AutoRange Meaning Indicator of Auto or manual range Manual 13 MAX MIN 14 RS232 15 Display of maximum or minimum value. Data output is in progress. 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.
Model UT803: OPERATING MANUAL Measurement Operation A. DC or AC Voltage Measurement (See figure 3) 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. To measure DC/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.
Model UT803: OPERATING MANUAL 4. Press AC/AC+DC button to measure AC+DC voltage’s true RMS. Note l In each range, the Meter has an input impedance of 10M except 600mV range has 3000M . 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).
Model UT803: OPERATING MANUAL B. DC or AC Current Measurement (See figure 4) Warning Before connect the Meter in serial with the tested return circuit, close the return circuit’s current to avoid the dangerous of sparking. If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt. Use proper terminals, function, and range for the measurement. When the testing leads are connected to the current terminals, do not parallel them across any circuit.
Model UT803: OPERATING MANUAL Note l If the 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. l For safety sake, each measurement time of high current (>5A) should be less than 10 seconds and the interval time between 2 measurements should be greater than 15 minutes.
Model UT803: OPERATING MANUAL C. Measuring Resistance (see figure 5) 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 avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V AC. To measure resistance, connect the Meter as follows: 1 . Insert the red test lead into the terminal and the black test lead into the COM terminal. 2 .
Model UT803: OPERATING MANUAL Note l The test leads and the Meter inside wire will bring around 0.2 to 0.5 of error to resistance measurement when measuring low resistance. To obtain accurate readings in low-resistance, shortcircuit the test lead beforehand and record the reading obtained, call this reading as X. Then use the equation: measured resistance value (Y) – (X) = accurate readings of resistance. l If reading with shorted test leads is not < 0.
Model UT803: OPERATING MANUAL D. Testing for Continuity (See figure 6) Warning 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 avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V AC. To test for continuity, connect the Meter as below: 1. Insert the red test lead into the terminal and the black test lead into the COM terminal. 2.
Model UT803: OPERATING MANUAL Note l Open circuit voltage around -1.2V and range is 600 . l When continuity testing 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.
Model UT803: OPERATING MANUAL E. Testing Diodes (See figure 7) Warning To avoid possible damage to the Meter and to the device under test, disconnect circuit power and discharge all high-voltage capacitors before testing diodes. To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V AC. Use the diode test to check diodes, transistors, and other semiconductor devices.
Model UT803: OPERATING MANUAL To test a diode out of a circuit, connect the Meter as follows: 1. Insert the red test lead into terminal and the black test lead into the COM terminal. 2. Set the rotary switch to and press SELECT button to select measurement mode. 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.
Model UT803: OPERATING MANUAL F. Capacitance Measurement (See figure 8) Warning 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: 1. Insert the red test lead into the Hz mV terminal and the black test lead into the COM terminal. 2. Set the rotary switch to . 3.
Model UT803: OPERATING MANUAL Note l The Meter displays a fixed value which is the distributed capacitor’s value of the inside Meter. To ensure accuracy, it is necessary to subtract this value from the measured value when measuring small capacitor. l Multi-purpose socket can be used instead of testing leads. Insert the capacitor being tested into the corresponding input terminal of the multi-purpose socket. When measuring small capacitor value, more accurate value can be obtained using multipurpose socket.
Model UT803: OPERATING MANUAL G. Frequency Measurement (see figure 9) Warning To avoid harms to you, please do not attempt to input tested frequency’s voltages higher than 30V rms. To measure frequency, connect the Meter as follows: 1. Insert the red test lead into the Hz terminal and the black test lead into the COM terminal. 2. Set the rotary switch to Hz0F and press SELECT button to select Hz measurement mode. 3. Connect the test leads across with the object being measured.
Model UT803: OPERATING MANUAL Note l When making frequency measurement, it must comply with the following scope (a) requirement: When 10Hz ~ 1Mz :150mV a 30V rms When > 1Mz~ 10MHz :300mV a 30V rms When > 10Mz~ 50MHz :600mV a 30V rms When > 50Mz :Unspecified l When frequency 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.
Model UT803: OPERATING MANUAL H. Temperature Measurement (see figure 10) Warning To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V AC. To measure temperature, connect the Meter as follows: 1. Set the rotary switch to 0C to measure degree celsius temperature or Hz0F and press SELECT button to select 0F measurement mode to measure Fahrenheit temperature. 2. Insert the multi-purpose socket into the corresponding Hz and COM terminal. 3.
Model UT803: OPERATING MANUAL Note l The testing environment must between 180C to 280C to ensure accuracy especially when measuring low temperature. l Different reading may be obtained when testing room environment under short or open circuit situation, then short-circuited reading shall be considered as the correct reading. l The included point contact temperature probe can only be used under 2300C. For any measurement higher than that, the rod type temperature probe must be used instead.
Model UT803: OPERATING MANUAL I. Measuring Transistor (see figure 11) Warning To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V AC. To measure transistor, connect the Meter as follows: 1. Insert the multi-purpose socket into the µAmA and Hz input terminal. 2. Set the rotary switch to hFE. 3. Insert the NPN or PNP type transistor to be tested into the corresponding input terminals of the multipurpose socket. 4.
Model UT803: OPERATING MANUAL Operation of Hold Mode 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. The SELECT Button It uses for selecting the required measurement function when there is more than one function at one position of the rotary switch. The Hold mode is applicable to all measurement functions. l Press HOLD to enter Hold mode.
Model UT803: OPERATING MANUAL Turning on the Display Backlight Warning In order to avoid the hazard arising from mistaken readings in insufficient light or poor vision, please use Display Backlight function. l Press LIGHT button to turn the Display Backlight on. l Press LIGHT button again to turn the Display Backlight off, otherwise it will stay on continuously. l When using the AC power to turn the Meter on, the Display Backlight always stays on.
Model UT803: OPERATING MANUAL The MAX MIN Button POWER INPUT Switch MAX MIN recording mode captures and stores the maximum and minimum input value detected. It is used to select AC 220V/50Hz or DC 6pcs of 1.5V battery (R14) to power on the Meter. It is located at the tail of the Meter. To use the MAX MIN mode as follows: l Press MAX MIN to display the highest reading ( MAX is shown on display). l Press MAX MIN again to display the lowest reading ( MIN is shown on display).
Model UT803: OPERATING MANUAL Sleep Mode RS232 Button When the Meter display symbol, it automatically turns off if you do not turn the rotary switch or press any button for around 10 minutes to preserve battery. The last measurement value will be kept. Press RS232 button to enter or exit data output mode. In RS232C serial port data output mode, the Hold and Max Min mode cannot output to the computer, the computer will only display the present measuring value.
Model UT803: OPERATING MANUAL General Specifications l Maximum Voltage between any Terminals and Grounding: Refer to different range input protection voltage. Fused Protection for HzΩmV Input Terminal: l 200mA, 250V, fast type, φ5x20mm (only apply on hFE functions) Fused Protection for µAmA Input Terminal: l 500mA, 250V, fast type, φ5x20mm. l Fused Protection for 10A Input Terminal: 10A, 250V, fast type, φ5x20mm. l Fused Protection for AC220V Terminal: 200mA, 250V, fast type, φ5x20mm.
Model UT803: OPERATING MANUAL Accuracy Specifications Accuracy: (a% reading + b digits),guarantee for 1 year. Operating temperature: 230C 50C. Relative humidity: not more than 75% RH. Temperature coefficient: 0.1 x (specified accuracy)/10C. A. DC Voltage Range Resolution 600mV 0.1mV 6V 0.001V 60V 0.01V 600V 0.1V 1000V 1V Remarks: l Input Impedance: At 600mV range : Around > 3000M . At all other ranges: Around 10M . 38 Accuracy Overload Protection (0.6%+2) (0.3%+2) (0.
Model UT803: OPERATING MANUAL B. AC Voltage Range Resolution Accuracy Overload Protection 40Hz-50kHz: (0.6%+5) 600mV 0.1mV >50kHZ-100kHz: (1%+5) 40Hz-1kHz: (0.6%+5) 6V 0.001V >1kHz-10kHz: (1.0%+5) >10kHz-100kHz: (3%+5) 40Hz-1kHz: (0.6%+5) 60V 0.01V 1000V >1kHz-10kHz: (1.5%+5) >10kHz-20kHz: (3%+5) >20kHz-100kHz: (8%+5) 600V 0.1V 1000V 1V 40Hz-1kHz: (0.6%+5) >1kHz-10kHz: (3.5%+5) 40Hz-1kHz: (1.
Model UT803: OPERATING MANUAL Remarks: l Input Impedance: At 600mV range : Around > 3000M At all other ranges: Around 10M l Displays: True RMS (applicable to the range of 10%~95%) At 1000V range: AC peak factor 1.5. All other ranges: AC peak factor 3.0. Input short circuit has around less than 30 remaining digits, it will not affect accuracy.
Model UT803: OPERATING MANUAL C. DC Current Range Resolution Accuracy Overload Protection (0.5%+3) Fuse 500mA, 250V, 600µA 0.1µA 6000µA 1µA 60mA 0.01mA 600mA 0.1mA (0.8%+3) 10A 10mA (1.2%+3) fast type, φ5x20mm. Fuse 10A, 250V, fast type, φ5x20mm. Remarks: l At 5A range: Continuous measurement is allowed. l At >5A range: For continuous measurement 10 seconds and interval not less than 15 minutes.
Model UT803: OPERATING MANUAL D. AC Current Range Resolution 600µA 0.1µA 6000µA 1µA 60mA 0.01mA 600mA 0.1mA 10A 10mA Accuracy 40Hz~10kHz: (1.0%+5) >10kHz~15kHz: (2%+5) Overload Protection Fuse 500mA, 250V, fast type, 5x20mm. 40Hz~10kHz: (1%+5) >10kHz~15kHz: (3%+5) 40Hz~5kHz: (2.0%+6) Fuse 10A,250V, fast type, 5x20mm. Remarks: l At 5A range: Continuous measurement is allowed. l At >5A range : For continuous measurement 10 seconds and interval not less than 15 minutes.
Model UT803: OPERATING MANUAL E. Resistance Range Resolution Accuracy Overload Protection (0.8%+3) + test lead short 600 0.1 6k 0.001k 60k 0.01k 600k 0.1k 6M 0.001M (0.8%+2) 60M 0.01M (1.2%+3) circuit resistance value (0.
Model UT803: OPERATING MANUAL F. Continuity Test Range Resolution Overload Protection Remarks l Open circuit voltage approximate -1.2V. l When circuit disconnected with resistance value 1 250V rms > 70 , buzzer does not beep. l When circuit is in good connection with resistance value 70 buzzer beeps continuously. G. Diode Testst Range Resolution 10mV Overload Protection 250V rms Remarks l Open circuit voltage approximate 2.7V. l Working current approximate 1mA.
Model UT803: OPERATING MANUAL H. Capacitance Range Resolution 6nF 0.001nF 60nF 0.01nF 600nF 0.1nF 6µF 0.001µF 60µF 0.01µF 600µF 0.1µF (3%+4) 6mF 0.001mF (5%+4) Remarks: l At 6nF, 60nF and 600nF Range: reading must subtract Accuracy Overload Protection (2.5%+5) (2%+5) 250V rms the test lead open circuit capacitance value.
Model UT803: OPERATING MANUAL I. Frequency Range Resolution 6kHz 0.001kHz 60kHz 0.01kHz 600kHz 0.1kHz 6MHz 0.001MHz 60MHz 0.01MHz Remarks: l Input scope (a): (DC electric level is zero) When 10Hz ~ 1MHz : 150mV a 30V rms When > 1MHz ~ 10MHz : 300mV a 30V rms When > 10MHz ~ 50MHz : 600mV a 30V rms When > 50MHz : Unspecified 46 Accuracy Overload Protection (0.
Model UT803: OPERATING MANUAL J. Temperature Range Resolution Accuracy 0 0 -40 C~0 C 0 0 C 1C 0 (8%+5) 0 >0 C~400 C 0 (1%+3) 0 >400 C~1000 C 0 0 -40 C~32 C 0 0 F 1F 0 250V rms (1.5%+3) (8%+5) 0 >32 F~752 F 0 Overload Protection (1.5%+5) 0 >752 F~1832 F (2.5%+5) Remarks: l The included point contact temperature probe can only be used to measure under 2300C temperature. For any measurement higher than that, the rod type temperature probe must be used instead. K.
Model UT803: OPERATING MANUAL Maintenance A. General Service This section provides basic maintenance information including battery and fuse replacement instruction. l Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. l To clean the terminals with cotton bar with detergent, as dirt or moisture in the terminals can affect readings. l Turn off the power of the Meter when it is not in use. l Take out the battery when it is using for a long time.
Model UT803: OPERATING MANUAL B. Replacing the Fuses (see figure 12) 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. To replace the Meter’s fuse: 1. Press the POWER to turn the Meter off, disconnect the power cord and remove all connections from the terminals. 2. Fuse 1: Remove the screws from the power socket at the rear of the Meter.
Model UT803: OPERATING MANUAL Fuse 4:It is located at the PCB. Remove the fuse by gently prying one end loose, then take out the fuse from its bracket. Then install the replacement fuse 3. Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket.
Model UT803: OPERATING MANUAL C. Replacing the Battery (see figure 13) 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 when using battery to power on the Meter. To replace the battery: 1. Press the POWER to turn the Meter off and remove all connections from the terminals. 2. Use a coin to open the accessories compartment at the top of the front case. 3.
Model UT803: OPERATING MANUAL RS232C and USB Serial Port System Requirements for Installing the UT803 Interface Program To use UT803 Interface Program, you need the following hardware and software: l An IBM PC or equivalent computer with 80486 or higher processor and 600 x 800 pixel or better monitor. l Microsoft Windows 95 or above. l At least 8MB of RAM. l At least 8MB free space in hard drive. l Can access to a local or a network CD-ROM. l A free serial port.
Model UT803: OPERATING MANUAL RS232C Serial Port A.
Model UT803: OPERATING MANUAL B. RS232C Port Cable The Meter D-sub 9 Pin Male 1 (DCD) 2 (RXD) 3 (TXD) 4 (DTR) 5 (SG) 6 (DSR) 7 (RTS) 8 (CTS) 9 (RI) 54 C.
Model UT803: OPERATING MANUAL USB Serial Port A. Connecting between the Meter and computer (see figure 15) B. Setting of USB Serial Ports Install the USB serial port driver according to the Installation Guide & Computer Interface Software before connecting the Meter and computer. UT803 Back Faceplate To COMPUTER Check for the USB Serial port shown at the Control Panel => System => Device Manager. Make sure connect the Meter and the computer with the same port.
Model UT803: OPERATING MANUAL This operating manual is subject to change without notice. Copyright 2004 Uni-Trend International Limited. All rights reserved.
