UNI-T UT33A Operating Manual
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UNI-T UT33A Operating Manual

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Model UT33A: OPERATING MANUAL

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Summary of Contents for UNI-T UT33A

  • Page 1: Table Of Contents

    Model UT33A: OPERATING MANUAL Table of Contents (1) Title Page Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter structure Functional Buttons LCD Display Measurement Operation DC Voltage Measurement AC Voltage Measurement DC Current Measurement...
  • Page 2 Model UT33A: OPERATING MANUAL Table of Contents (2) Title Page Sleep Mode General Specifications Accuracy Specifications DC Voltage AC Voltage C. DC Current D. AC Current Resistance Diodes and Continuity Measurement G. Transistor hFE Test Maintenance General Service Replacing the Battery...

  • Page 3: Overview

    To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safety Operation” carefully before using the Meter. The Model UT33A Multimeter (hereafter referred as “the Meter”) is a 3 3/4 digits with steady operations, fashionable design and highly reliable hand-held measuring instrument.

  • Page 4: Unpacking Inspection

    Model UT33A: 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: Description Item English Operating Manual 1 piece 1 pair Test Lead 1 piece Holster In the event you find any missing or damage, please contact your dealer immediately.

  • Page 5: Safety Information

    Model UT33A: OPERATING MANUAL Safety Information(1) Safety Information This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT I 600V, CAT II 300V) and double insulation. CAT. I: Signal level, special equipment or parts of equipment, telecommunication, electronic, etc., with smaller transient overvoltages than overvoltages CAT.
  • Page 6 Model UT33A: OPERATING MANUAL Safety Information(2) 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.

  • Page 7: Rules For Safe Operation

    Model UT33A: 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.
  • Page 8 Model UT33A: OPERATING MANUAL Rules For Safe Operation (2) l When the Meter is working at an effective voltage over 60V in DC or 42V rms in AC, special care should be taken for there is danger of electric shock.
  • Page 9 Model UT33A: OPERATING MANUAL Rules For Safe Operation (3) l Remove test leads 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.

  • Page 10: International Electrical Symbols

    Model UT33A: OPERATING MANUAL International Electrical Symbols AC or DC AC Current DC Current Grounding Double Insulated. Deficiency of Built-In Battery Diode. Fuse. Continuity Test Warning. Refer to the Operating Manual Conforms to Standards of European Union.

  • Page 11: The Meter Structure

    Model UT33A: OPERATING MANUAL The Meter Structure The Meter Structure (figure 1) LCD Display SELECT Button Rotary Switch COM Input Terminal 10A Input Terminal Other Input Terminal Transistor Input Terminal (figure 1)

  • Page 12: Functional Buttons

    Model UT33A: OPERATING MANUAL Functional Buttons SELECT button Selecting for DC and AC current measurement, Continuity Test and Diode Test. The buzzer sounds when switching from one function to the other.Press this button to activate the Meter when it is under Sleep Mode.

  • Page 13: Lcd Display

    Model UT33A: OPERATING MANUAL LCD Display LCD Display (see figure 2) (figure 2)

  • Page 14: Measurement Operation

    Model UT33A: OPERATING MANUAL Measurement Operation (1) A. DC 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 500V although readings may be obtained.

  • Page 15: Ac Voltage Measurement

    Model UT33A: OPERATING MANUAL Measurement Operation (2) Note: l DCV Measurement is autoranging, the Meter 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).
  • Page 16 Model UT33A: OPERATING MANUAL Measurement Operation (3) 2. Set the rotary switch to V range. 3. Connect the test leads across with the object being measured. The measured value shows on the display. Note: l DCV Measurement is autoranging, the Meter has an input impedance of approx.

  • Page 17: Dc Current Measurement

    Model UT33A: OPERATING MANUAL Measurement Operation (4) C. DC Current Measurement (see figure 4) Warning Never attempt an in-circuit current measurement where the voltage between terminals and ground is greater than 60V . If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt.
  • Page 18 Model UT33A: OPERATING MANUAL Measurement Operation (5) V mA or 10A Insert the red test lead into the terminal and the black test lead into the COM terminal. 3. Set the rotary switch to an appropriate measurement position in A range.

  • Page 19: Ac Current Measurement

    Model UT33A: OPERATING MANUAL Measurement Operation (6) D. AC Current Measurement (see figure 4) Warning Never attempt an in-circuit current measurement where the open-circuit voltage between the circuit and ground is greater than 500V. If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt.
  • Page 20 Model UT33A: OPERATING MANUAL Measurement Operation (7) 5. 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.

  • Page 21: Resistance Measurement

    Model UT33A: OPERATING MANUAL Measurement Operation (8) E. Resistance Measurement (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. ranges are : 400.0 4.000k...
  • Page 22 Model UT33A: OPERATING MANUAL Measurement Operation (9) Note The test leads can add 0.1 to 0.3 of error to resistance measurement. To obtain precision readings in low-resistance measurement, that is the range of 200 , short-circuit the input terminals beforehand and record the reading obtained (called this reading as X).

  • Page 23: Diode And Continuity Test

    Model UT33A: OPERATING MANUAL Measurement Operation (10) F. Diode and Continuity Test (see figure 6) Testing Diodes Warning To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before diodes.
  • Page 24 Model UT33A: OPERATING MANUAL Measurement Operation (11) To test a diode out of a circuit, connect the Meter as follows: 1. Insert the red test lead into the V mA terminal and the black test lead into the COM terminal.
  • Page 25 Model UT33A: OPERATING MANUAL Measurement Operation (12) l When diode testing has been completed, disconnect the connection between the testing leads and the circuit under test. Testing for Continuity To test for continuity, connect the Meter as below: 1. Insert the red test lead into the V mA terminal and the black test lead into the COM terminal.

  • Page 26: Transistor Hfe Measurement

    Model UT33A: OPERATING MANUAL Measurement Operation (13) G. Transistor hFE Measurement (see figure 7) Warning To avoid damages to the Meter or to the devices under test, do not input any current over 60V DC or 30V AC. 1. Check that the transistor is PNP or NPN type.

  • Page 27: Sleep Mode

    Model UT33A: 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 30 minutes. The Meter can be activated by pressing the SELECT button or turning the rotary switch.

  • Page 28: General Specifications

    Model UT33A: OPERATING MANUAL General Specifications(1) Maximum Voltage between any Terminals and Grounding: 500V rms. Fused Protection for V mA Input Terminal: 500mA, 250V fast type, 5x20 mm 10A Terminal: Un-fused. Range: Auto ranging Maximum Display: Display: 3999. Measurement Speed: Updates 3 times / second.
  • Page 29 Model UT33A: OPERATING MANUAL General Specifications(2) Battery Type: Two piece of 1.5V AAA Battery. Battery Deficiency: Display: Negative reading: Display: “-“. “ ” Overloading: Display: Dimensions (HxWxL): 130 x 73.5 x 35mm. Weight: Approx. 156g (battery included). Safety/Compliances: IEC61010 CAT I 600V, CAT II 300V overvoltage and double insulation standard.

  • Page 30: Accuracy Specifications

    Model UT33A: OPERATING MANUAL Accuracy Specifications(1) Accuracy: (a% reading + b digits), guarantee for 1 year. Operating temperature: 23 Relative humidity: <75%. A. DC Voltage Overload Protection Range Resolution Accuracy 100 V (0.8%+3) 400mV 500V DC or AC (0.8%+1) 10mV...

  • Page 31: Ac Voltage

    Model UT33A: OPERATING MANUAL Accuracy Specifications(2) B. AC Voltage Overload Protection Range Resolution Accuracy (1.2%+3) 500V DC or AC 10mV 400V 100mV (1.5%+5) 500V Remarks: Input impedance: approx. 10M Displays effective value of sine wave (mean value response). Frequency response 40Hz ~ 400Hz.

  • Page 32: Dc Current

    Model UT33A: OPERATING MANUAL Accuracy Specifications(3) C. DC Current Overload Protection Range Resolution Accuracy 0.1 A 400 A 500mA/250V fast type (1%+2) fuse 5x20mm 4000 A 10 A 40mA (1.2%+2) 400mA 100 A Un-Fused (1.5%+5) 10mA Remark: At 10A Range: For continuous measurement 10 seconds and interval not less than 15 minutes.

  • Page 33: Ac Current

    Model UT33A: OPERATING MANUAL Accuracy Specifications(4) D. AC Current Overload Protection Range Resolution Accuracy 0.1 A 400 A 500mA/250V fast type (1.5%+5) fuse 5x20mm 4000 A 10 A 40mA (2%+5) 400mA 100 A Un-Fused (2.5%+5) 10mA Remark: At 10A Range: For continuous measurement 10 seconds and interval not less than 15 minutes.

  • Page 34: Resistance

    Model UT33A: OPERATING MANUAL Accuracy Specifications(5) E. Resistance Overload Protection Range Resolution Accuracy (1.2%+2) (1%+2) 250V DC or AC 400k (1.2%+2) (1.5%+2)

  • Page 35: Diodes And Continuity Measurement

    Model UT33A: OPERATING MANUAL Accuracy Specifications(6) F. Diodes and Continuity Measurement Overload Protection Range Resolution Remark Displays approximate forward voltage drop reading 250V DC or AC Buzzer beeps at <100 G. Transistor hFE Test Testing Condition Range Remark Can test NPN and PNP type transistor.

  • Page 36: Maintenance

    Model UT33A: OPERATING MANUAL Maintenance(1) 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.

  • Page 37: Replacing The Battery

    Model UT33A: OPERATING MANUAL Maintenance(3) B. Replacing the Battery (see figure 8) Warning To avoid false readings, which could lead to possible electric shock or personal injury, SCREW replace the battery as soon as the battery indicator “ ”appears. To replace the battery: 1.

  • Page 38: Replacing The Fuses

    Model UT33A: OPERATING MANUAL Maintenance(4) 4. Remove the battery from the battery compartment. 5. Replace the battery with a new 1.5V AAA battery. 6. Rejoin the case bottom and case top, and reinstall the screw. C. Replacing the Fuses (see figure 8)
  • Page 39 Model UT33A: OPERATING MANUAL Maintenance(5) 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.
  • Page 40 Model UT33A: OPERATING MANUAL Replacement of the fuses is seldom required. Burning of a fuse always results from improper operation. ** END **...
  • Page 41 Model UT33A: OPERATING MANUAL...
  • Page 42 Model UT33A: OPERATING MANUAL This operating manual is subject to change without notice. Copyright 2003 Uni-Trend International Limited. All rights reserved. Manufacturer: Uni-Trend International 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...

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