UNI-T UT803 Operating Manual
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UNI-T UT803 Operating Manual

Digital bench-type true rms multimeter
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Model UT803
OPERATING MANUAL

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  • Page 1 Model UT803 OPERATING MANUAL...

  • Page 3: Table Of Contents

    Model UT803: OPERATING MANUAL TABLE OF CONTENTS TITLE PAGE 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.
  • Page 4 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. Connecting between the Meter and computer B. RS232C Port Cable C. Setting of RS232C Serial Ports USB Serial Port A.

  • Page 5: Overview

    “Safety Information” and “Rules for Safety Operation” carefully before using the Meter. Digital Bench-Type True RMS Multimeter Model UT803 (hereafter referred to as “the Meter”) has autorange and manual range options with maximum reading 5999 and 3 5/6 digits which has a unique outlook design.

  • Page 6: Unpacking Inspection

    Model UT803: OPERATING MANUAL 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 1 piece Operating Manual 1 pair Test Lead 1 pair Alligator Clip...

  • Page 7: Safety Information

    Model UT803: OPERATING MANUAL Safety Information A Note identifies the information that user should pay attention on. This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT. I 1000V, International electrical symbols used on the Meter and CAT.II 600V) and double insulation.

  • Page 8: Rules For Safe Operation

    Model UT803: OPERATING MANUAL Rules For Safe Operation 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. Warning Use the proper terminals, function, and range for To avoid possible electric shock or personal injury, your measurements.
  • Page 9 Model UT803: OPERATING MANUAL Replace the battery as soon as the battery indicator Turn the Meter power off when it is not in use. appears. With a low battery, the Meter might Take out the battery when not using for a long time produce false readings that can lead to electric shock if using battery to power on the Meter.

  • Page 10: International Electrical Symbols

    Model UT803: OPERATING MANUAL International Electrical Symbols AC or DC Grounding Double Insulated Warning. Refer to the Operating Manual Deficiency of Built-In Battery Continuity Test Diode Capacitance Test Fuse Conforms to Standards of European Union...

  • Page 11: The Meter Structure

    Model UT803: OPERATING MANUAL The Meter Structure (see figure 1) (Figure 1) 1. LCD Display 2. Rotary Switch 3. Input Terminals 4. Functional Buttons...

  • Page 12: Rotary Switch

    Model UT803: OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions: Rotary Switch Position Function AC and DC voltage measurement :Continuity test. :Diode test. :Resistance measurement. Capacitance test :Frequency measurement. :Temperature in Fahrenheit Temperature in celsius Transistor test AC or DC current measurement range from 0.1uA to 5999uA.

  • Page 13: Functional Buttons

    Model UT803: OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations. Button Operation Performed POWER Turn the power on and off. LIGHT Turn the display backlight on and off. SELECT Switches between AC and DC measurement.

  • Page 14: Display Symbols

    Model UT803: OPERATING MANUAL Display Symbols (see figure 2) 10 1 5.6.7 Auto Range Manual C umVA AC+DC Trus RMS Trms RS232 DC munF HOLD Mk Hz (Figure 2)
  • Page 15 Model UT803: OPERATING MANUAL Number Meaning Symbol True RMS Indicator for true rms value. HOLD Data hold is active. Sleep Mode feature is enabled. Indicates negative reading. Indicator for AC voltage or current. Indicator for DC voltage or current AC+DC Indicator for AC+DC measurement The input value is too large for the selected range.
  • Page 16 Model UT803: OPERATING MANUAL Number Meaning Symbol V, mV V : Volts. The unit of voltage. mV: Millivolt.1 x 10 or 0.001 volts. F, mF, F : Farad.The unit of capacitance. µF,nF mF: Millifarad.1 x 10 or 0.001 farads µF : Microfarad.1x10 or 0.000001 farads.
  • Page 17 Model UT803: OPERATING MANUAL Number Meaning Symbol AutoRange Indicator of Auto or manual range Manual Display of maximum or minimum value. RS232 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.

  • Page 18: Measurement Operation

    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.
  • Page 19 Model UT803: OPERATING MANUAL 4. Press AC/AC+DC button to measure AC+DC voltage’s true RMS. Note In each range, the Meter has an input impedance of except 600mV range has 3000M . This loading effect can cause measurement errors in high impedance circuits.

  • Page 20: Dc Or Ac Current Measurement

    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.
  • Page 21 Model UT803: OPERATING MANUAL Note 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. For safety sake, each measurement time of high current (>5A) should be less than 10 seconds and...

  • Page 22: Measuring Resistance

    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.
  • Page 23 Model UT803: OPERATING MANUAL Note When resistance measurement has been completed, The test leads and the Meter inside wire will bring disconnect the connection between the testing leads and the circuit under test, and remove the testing around 0.2 to 0.5 of error to resistance measurement when measuring low resistance.

  • Page 24: Testing For Continuity

    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.
  • Page 25 Model UT803: OPERATING MANUAL Note Open circuit voltage around -1.2V and range is 600 . 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.

  • Page 26: Testing Diodes

    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.
  • Page 27 Model UT803: OPERATING MANUAL To test a diode out of a circuit, connect the Meter as follows: When diode testing has been completed, disconnect the connection between the testing leads and the Insert the red test lead into terminal and the black circuit under test, and remove the testing leads away test lead into the COM terminal.

  • Page 28: Capacitance Measurement

    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.
  • Page 29 Model UT803: OPERATING MANUAL Note When capacitance measurement has been completed, disconnect the connection between the The Meter displays a fixed value which is the testing leads and the circuit under test and remove distributed capacitor’s value of the inside Meter. To...

  • Page 30: Frequency Measurement

    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: Insert the red test lead into the Hz terminal and the black test lead into the COM terminal.
  • Page 31 Model UT803: OPERATING MANUAL Note When making frequency measurement, it must comply with the following scope (a) requirement: When 10Hz ~ 1Mz :150mV 30V rms When > 1Mz~ 10MHz :300mV 30V rms When > 10Mz~ 50MHz :600mV 30V rms When > 50Mz...

  • Page 32: Temperature Measurement

    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: Set the rotary switch to...
  • Page 33 Model UT803: OPERATING MANUAL Note When temperature measurement has been completed, disconnect the connection between the The testing environment must between 18 C to 28 temperature probe, multi-purpose socket and the to ensure accuracy especially when measuring low circuit under test, and remove the temperature probe temperature.

  • Page 34: Measuring Transistor

    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: Insert the multi-purpose socket into the µAmA and Hz input terminal.

  • Page 35: Operation Of Hold Mode

    Model UT803: OPERATING MANUAL Operation of Hold Mode The SELECT Button It uses for selecting the required measurement function Warning when there is more than one function at one position To avoid possibility of electric shock, do not use Hold of the rotary switch.

  • Page 36: Turning On The Display Backlight

    Model UT803: OPERATING MANUAL Turning on the Display Backlight The RANGE Button Press RANGE to enter the manual ranging mode; Warning the Meter beeps. In order to avoid the hazard arising from mistaken Press and hold RANGE for over 1 second to return readings in insufficient light or poor vision, please to autoranging;...

  • Page 37: The Max Min Button

    Model UT803: OPERATING MANUAL The MAX MIN Button POWER INPUT Switch It is used to select AC 220V/50Hz or DC 6pcs of 1.5V MAX MIN recording mode captures and stores the battery (R14) to power on the Meter. It is located at the maximum and minimum input value detected.

  • Page 38: Sleep Mode

    Model UT803: OPERATING MANUAL Sleep Mode RS232 Button Press RS232 button to enter or exit data output mode. When the Meter display symbol, it automatically In RS232C serial port data output mode, the Hold and turns off if you do not turn the rotary switch or press Max Min mode cannot output to the computer, the any button for around 10 minutes to preserve battery.

  • Page 39: General Specifications

    Model UT803: OPERATING MANUAL General Specifications Relative Humidity: 75% @ 0 C - 30 C below; 50% @ 30 - 40 Maximum Voltage between any Terminals and Altitude: Grounding: Operating: 2000 m. Refer to different range input protection voltage. Storage : 10000 m.

  • Page 40: Accuracy Specifications

    Model UT803: OPERATING MANUAL Accuracy Specifications Accuracy: (a% reading + b digits),guarantee for 1 year. Operating temperature: 23 Relative humidity: not more than 75% RH. Temperature coefficient: 0.1 x (specified accuracy)/1 A. DC Voltage Range Resolution Accuracy Overload Protection 600mV 0.1mV...

  • Page 41: Ac Voltage

    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) >1kHz-10kHz: (1.0%+5) 0.001V >10kHz-100kHz: (3%+5) 40Hz-1kHz: (0.6%+5) 1000V >1kHz-10kHz: (1.5%+5) 0.01V >10kHz-20kHz: (3%+5) >20kHz-100kHz: (8%+5) 40Hz-1kHz: (0.6%+5) 600V 0.1V >1kHz-10kHz: (3.5%+5) 40Hz-1kHz: (1.2%+3)
  • Page 42 Model UT803: OPERATING MANUAL Remarks: Input Impedance: At 600mV range : Around > 3000M At all other ranges: Around 10M 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.

  • Page 43: Dc Current

    Model UT803: OPERATING MANUAL C. DC Current Range Resolution Accuracy Overload Protection 600µA 0.1µA Fuse 500mA, 250V, 6000µA 1µA (0.5%+3) fast type, 5x20mm. 60mA 0.01mA 600mA 0.1mA (0.8%+3) Fuse 10A, 250V, 10mA (1.2%+3) fast type, 5x20mm. Remarks: 5A range: Continuous measurement is allowed.

  • Page 44: Ac Current

    Model UT803: OPERATING MANUAL D. AC Current Range Resolution Accuracy Overload Protection 600µA 0.1µA 40Hz~10kHz: (1.0%+5) 6000µA 1µA Fuse 500mA, 250V, fast >10kHz~15kHz: (2%+5) 60mA 0.01mA type, 5x20mm. 40Hz~10kHz: (1%+5) 600mA 0.1mA >10kHz~15kHz: (3%+5) Fuse 10A,250V, 40Hz~5kHz: (2.0%+6) 10mA fast type, 5x20mm.

  • Page 45: Resistance

    Model UT803: OPERATING MANUAL E. Resistance Range Resolution Accuracy Overload Protection (0.8%+3) + test lead short circuit resistance value 0.001k 250V rms (0.5%+2) 0.01k 600k 0.1k (0.8%+2) 0.001M (1.2%+3) 0.01M...

  • Page 46: Continuity Test

    Model UT803: OPERATING MANUAL F. Continuity Test Range Resolution Overload Protection Remarks Open circuit voltage approximate -1.2V. When circuit disconnected with resistance value 250V rms > 70 , buzzer does not beep. When circuit is in good connection with resistance value buzzer beeps continuously.

  • Page 47: Capacitance

    Model UT803: OPERATING MANUAL H. Capacitance Range Resolution Accuracy Overload Protection 0.001nF (2.5%+5) 60nF 0.01nF 600nF 0.1nF 250V rms (2%+5) 6µF 0.001µF 60µF 0.01µF (3%+4) 600µF 0.1µF (5%+4) 0.001mF Remarks: At 6nF, 60nF and 600nF Range: reading must subtract the test lead open circuit capacitance value.

  • Page 48: Frequency

    Model UT803: OPERATING MANUAL I. Frequency Range Resolution Accuracy Overload Protection 6kHz 0.001kHz 60kHz 0.01kHz (0.1%+3) 250V rms 600kHz 0.1kHz 6MHz 0.001MHz 60MHz 0.01MHz Remarks: Input scope (a): (DC electric level is zero) When 10Hz ~ 1MHz : 150mV 30V rms When >...

  • Page 49: Temperature

    Model UT803: OPERATING MANUAL J. Temperature Range Resolution Accuracy Overload Protection (8%+5) >0 C~400 (1%+3) >400 C~1000 (1.5%+3) 250V rms C~32 (8%+5) >32 F~752 (1.5%+5) >752 F~1832 (2.5%+5) Remarks: The included point contact temperature probe can only be used to measure under 230 C temperature.

  • Page 50: Maintenance

    Model UT803: OPERATING MANUAL Maintenance A. General Service Periodically wipe the case with a damp cloth and This section provides basic maintenance information mild detergent. Do not use abrasives or solvents. including battery and fuse replacement instruction. To clean the terminals with cotton bar with detergent, as dirt or moisture in the terminals can affect readings.

  • Page 51: Replacing The Fuses

    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.
  • Page 52 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 Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket.

  • Page 53: Replacing The Battery

    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.

  • Page 54: Rs232C And Usb Serial Port

    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: An IBM PC or equivalent computer with 80486 or higher processor and 600 x 800 pixel or better monitor.

  • Page 55: Rs232C Serial Port

    Model UT803: OPERATING MANUAL RS232C Serial Port A. Connecting between the Meter and computer (see figure 14) UT803 Back Faceplate To COMPUTER (Figure 14)

  • Page 56: Rs232C Port Cable

    Model UT803: OPERATING MANUAL B. RS232C Port Cable C. Setting of RS232C Serial Ports Default of RS232C serial port for communication is set as: The Meter Computer Baud Rate 19200 D-sub D-sub D-sub Start bit 9 Pin Male 9 Pin Female...

  • Page 57: Usb Serial Port

    Please refer to the included “Installation Guide & Computer Interface Software” for installing and operating instructions of the UT803 Interface Program.. (Figure 15) The Meter is to be supplied from an identical USB port complying with the requirement of Limit Power Source.
  • Page 58 Model UT803: OPERATING MANUAL This operating manual is subject to change without notice. Copyright 2004 Uni-Trend International Limited. All rights reserved. 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,...

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