Related Manuals for UNI-T UT39A
Summary of Contents for UNI-T UT39A
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Page 1: Table Of Contents
Model UT39A/B/C: OPERATING MANUAL TABLE OF CONTENTS TITLE PAGE 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. - Page 2 Model UT39A/B/C: OPERATING MANUAL PAGE I. Diodes and Continuity Test J. Transistor Test Maintenance A. General Service B. Replacing the Battery C. Replacing the Fuses...
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Page 3: Overview
To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safety Operation” carefully before using the Meter. Digital Multimeters Model UT39A, UT39B and UT39C (hereafter referred to as “the Meter”) are 3 1/2 digits with steady operations, fashionable structure and highly reliable hand-held measuring instrument. -
Page 4: Safety Information
Model UT39A/B/C: 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. CAT. I: Signal level, special equipment or parts of equipment, telecommunication, electronic, etc., with smaller transient overvoltages than overvoltages CAT. -
Page 5: Rules For Safe Operation
Model UT39A/B/C: 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: 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 6 Model UT39A/B/C: OPERATING MANUAL continuity, diodes, capacitance or current. Before measuring current, check the Meter’s fuses and turn off power to the circuit before connecting the Meter to the circuit. 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.
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Page 7: International Electrical Symbols
Model UT39A/B/C: OPERATING MANUAL International Electrical Symbols Deficiency of Built-In Battery AC (Alternating Current) AC or DC Double Insulated Warning. Refer to the Operating Manual Conforms to Standards of European Union Grounding DC (Direct Current) Diode Continuity Test Fuse The Meter Structure (see figure 1) 1. -
Page 8: Functional Buttons
Model UT39A/B/C: OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations Operation Performed Button Turn the Meter on and off. POWER Press down the POWER to turn on the Meter. (Yellow Button) Press up the POWER to turn off the Meter. -
Page 9: Measurement Operation
Model UT39A/B/C: OPERATING MANUAL Measurement Operation 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, otherwise false readings may be provided. -
Page 10: Ac Voltage Measurement
Model UT39A/B/C: OPERATING MANUAL Note 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. The LCD displays “1” indicating the existing selected range is overloaded, it is required to select a higher range in order to obtain a correct reading. -
Page 11: Dc Current Measurement
Model UT39A/B/C: OPERATING MANUAL Note If the value of voltage to be measured is unknown, use the maximum measurement position (750V) and reduce the range step by step until a satisfactory reading is obtained. The LCD displays “1” indicating the existing selected range is overloaded, it is required to select a higher range in order to obtain a correct reading. - Page 12 Replace appropriate rating fuse when the fuse is burnt. Fuse specification: 0.315A. 250V fast type fuse, 5 x 20mm UT39A/UT39B - At 10A Range: For continuous measurement 10 seconds and interval not less than 15 minutes. UT39C – At 20A Range: For continuous measurement...
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Page 13: Ac Current Measurement
Replace appropriate rating fuse when the fuse is burnt. Fuse specification: 0.315A. 250V fast type fuse, 5 x 20mm UT39A/UT39B - At 10A Range: For continuous measurement 10 seconds and interval not less than 15 minutes. -
Page 14: Measuring Resistance
Model UT39A/B/C: OPERATING MANUAL UT39C – At 20A Range: For continuous measurement 10 seconds and interval not less than 15 minutes When current measurement has been completed, disconnect the connection between the testing leads and the circuit under test. E. Measuring Resistance (see figure 5) -
Page 15: Frequency Measurement (The Model Ut39C Only)
Model UT39A/B/C: OPERATING MANUAL When there is no input, for example in open circuit condition, the Meter displays “1”. When resistance measurement has been completed, disconnect the connection between the testing leads and the circuit under test. F. The Model UT39C: Frequency Measurement... -
Page 16: Temperature Measurement (The Model Ut39C Only)
Model UT39A/B/C: OPERATING MANUAL G. The Model UT39C: Temperature Measurement (see figure 7) Black (see figure 7) Warning To avoid harm to you or damages to the Meter, do not attempt to measure voltages higher than 60V in DC or 30V rms in AC although readings may be obtained. -
Page 17: Capacitance Measurement
Model UT39A/B/C: OPERATING MANUAL H. Capacitance Measurement (see figure 8) ( figure 8) Warning To avoid damage to the Meter or to the equipment under test, disconnect the tested circuit power when measuring on line capacitors and discharge all high- voltage capacitors before measuring capacitance. -
Page 18: Measuring Diodes & Continuity
Model UT39A/B/C: OPERATING MANUAL I. Measuring Diodes & Continuity Warning To avoid damage to the Meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring diodes and continuity. Never attempt to input over 60V in DC or 3V rms in AC to avoid personal dangerous. -
Page 19: Measuring Transistor
Model UT39A/B/C: OPERATING MANUAL Testing for Continuity To test for continuity, connect the Meter as below: 1. Insert the red test lead into V terminal and the black test lead into the COM terminal. 2. Set the rotary switch to 1. -
Page 20: Sleep Mode
Model UT39A/B/C: OPERATING MANUAL Note When transistor measeurement has been completed, remove the transistor from the transistor jack. 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 15 minutes. -
Page 21: Accuracy Specifications
Model UT39A/B/C: OPERATING MANUAL Accuracy Specifications Accuracy: (a% reading + b digits), guarantee for 1 year. Operating temperature: 23 Relative humidity: <75%. Temperature coefficient: 0.1 x (specified accuracy) / 1 A. DC Voltage Accuracy Overload Range Resolution UT39A UT39B UT39C... -
Page 22: Dc Current
10A/20A 10mA (2%+5) Un-Fused Remark: UT39A/UT39B - At 10A Range: For continuous measurement 10 seconds and interval not less than 15 minutes. UT39C – At 20A Range: For continuous measurement 10 seconds and interval not less than 15 minutes Measurement voltage drop: Full range at 200mV. -
Page 23: Resistance Test
Model UT39A/B/C: OPERATING MANUAL E. Resistance Test Accuracy Overload Range Resolution UT39A UT39B UT39C Protection (0.8%+3) (0.8%+1) 250V DC (0.8%+1) or AC rms 200k (0.8%+1) (1%+2) [5%(reading-10)+10] 200M 100k Remark: Open circuit voltage: At 200M range: approx. 3V Other ranges: 700mV At 200M range, test lead is in short circuit, and it is normal to display 10 digits. -
Page 24: Capacitance
H. Capacitance Accuracy Overload Range Resolution UT39A UT39B UT39C Protection (4%+3) 0.1nF 2 5 0 V A C (4%+3) 10nF (4%+3) Remark: Testing signal: approx. 400Hz, 40mV rms. I. Diodes and Continuity Test Input Function Range Resolution Remark Protection Open circuit voltage Diode approx.2.8V... -
Page 25: Maintenance
Model UT39A/B/C: OPERATING MANUAL Maintenance 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 26: Replacing The Fuses
Model UT39A/B/C: OPERATING MANUAL 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. Press the Meter power off 3. Remove the screw from the battery compartment, and then take out the battery door from the battery compartment. - Page 27 Model UT39A/B/C: OPERATING MANUAL 6. Remove the fuse by gently prying one end loose, and then take out the fuse from its bracket. 7. Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket.
- Page 28 Model UT39A/B/C: OPERATING MANUAL Copyright 2004 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...