Related Manuals for UNI-T UT50A
Summary of Contents for UNI-T UT50A
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Page 1: Table Of Contents
Model UT50A/B/C: OPERATING MANUAL Table of Contents Page Title Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The multimeter Structure Functional Buttons Display Symbols Measurement Operation DC Voltage Measurement AC Voltage Measurement DC Current Measurement AC Current Measurement... - Page 2 Model UT50A/B/C: OPERATING MANUAL Title Page Resistance Test The Model UT50C: Frequency The Model UT50B/UT50C: Temperature Capacitance Diodes and Continuity Test Maintenance General Service Replacing the Battery Replacing the Fuses...
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Page 3: Overview
To avoid electric shock or personal injury, read the "Safety Information" and "Rules for Safe Operation" carefully before using the Meter. Digital Multimeters Model UT50A, UT50B and UT50C (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: Unpacking Inspection
Model UT50A/B/C: 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 English Operating Manual 1 pair Test Lead 1 pair... -
Page 5: Safety Information
Model UT50A/B/C: 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. -
Page 6: Rules For Safe Operation
Model UT50A/B/C: 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 7 Model UT50A/B/C: 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.
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Page 8: International Electrical Symbols
Model UT50A/B/C: OPERATING MANUAL International Electrical Symbols AC (Alternating Current). DC (Direct Current). AC or DC. Grounding. Double Insulated. Deficiency of Built-In Battery. Continuity Test. Diode. Capacitance Test. Fuse. Warning. Refer to the Operating Manual. Conforms to Standards of European Union. -
Page 9: The Multimeter Structure
Model UT50A/B/C: OPERATING MANUAL The multimeter Structure (see figure 1) ( figure 1) LCD Display Data Hold Button. Rotary Switch Other Input Terminals COM Input Terminal 20A Input Terminal 7 The Model UT50A: AmA Input terminal The Model UT50B/UT50C:mA Input terminal Power... -
Page 10: Functional Buttons
Model UT50A/B/C: OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations Button Operation Performed Turn the Meter on and off. POWER Press down the POWER to turn (Yellow Button) on the Meter. Press up the POWER to turn off the Meter. -
Page 11: Display Symbols
Model UT50A/B/C: OPERATING MANUAL Display Symbols (see figure 2) 10-14 ( figure 2) Symbol 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. -
Page 12: Display Symbols
Model UT50A/B/C: OPERATING MANUAL Display Symbols (see figure 2) Symbol Meaning nF, F F: Farad. The unit of capacitance. F: Microfarad.1 x 10 or 0.000001 farads. nF: Nanofarad. 1 x 10 or 0.000000001 farads. The unit of frequency in cycles/ second. -
Page 13: Measurement Operation
Model UT50A/B/C: OPERATING MANUAL Measurement Operation(1) l Make sure the Sleep Mode is not on if you found there is no display on the LCD after turning on the Meter. l Make sure the Low Battery Display is not on, otherwise false readings may be provided. -
Page 14: Ac Voltage Measurement
Model UT50A/B/C: OPERATING MANUAL Measurement Operation(2) Note 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. l 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 15 Model UT50A/B/C: OPERATING MANUAL Measurement Operation(3) The Model UT50A: The AC voltage measurement has 5 measurement positions on the rotary switch: 200mV, 2V, 20V, 200V and 750V The Model UT50B/UT50C: The AC voltage measurement has 4 measurement positions on the rotary switch: 2V,...
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Page 16: Dc Current Measurement
When the testing leads are connected to the current terminals, do not parallel them across any circuit. The Model UT50A: The DC current measurement has 4 measurement positions on the rotary switch: 20 A, 2mA, 200mA and 20A. The Model UT50B: The DC current measurement has 4 measurement positions on the rotary switch: 2mA, 20mA, 200mA and 20A. -
Page 17: Ac Current Measurement
Model UT50A/B/C: OPERATING MANUAL Measurement Operation(5) Insert the red test lead into the AmA (The Model UT50B/UT50C) 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. - Page 18 When the testing leads are connected to the current terminals, do not parallel them across any circuit. The Model UT50A: The AC current measurement has 5 measurement positions on the rotary switch: 200 A, 2mA, 20mA, 200mA and 20A.
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Page 19: Measuring Resistance
Model UT50A/B/C: OPERATING MANUAL Measurement Operation(7) E. Measuring Resistance (see figure 7) black ( figure 7) 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. -
Page 20: The Model Ut50C: Frequency Measurement
Model UT50A/B/C: OPERATING MANUAL Measurement Operation(8) measured resistance value (Y) – (X) = precision readings of resistance. 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”. -
Page 21: The Model Ut50B/Ut50C: Temperature Measurement
Model UT50A/B/C: OPERATING MANUAL Measurement Operation(9) Note l When Hz measurement has been completed, disconnect the connection between the testing leads and the circuit under test. G. The Model UT50B/UT50C: Temperature Measurement (see figure 9) ( figure 9) Warning To avoid harm to you or damages to the Meter, do... -
Page 22: Capacitance Measurement
1. Insert the red test clip or red test lead into the V terminal and the black test clip or black test lead into the mA (The Model: UT50A) or mA (The Model: UT50B/UT50C) terminal. 2. Set the rotary switch to an appropriate measurement position in Fcx range. -
Page 23: Measuring Diodes & Continuity
Model UT50A/B/C: OPERATING MANUAL Measurement Operation(11) Note l For testing the capacitor with polarity, connect the red test lead to anode & black test lead to cathode l When the tested capacitor is shorted or the capacitor value is overloaded, the LCD display “1”. -
Page 24: Testing For Continuity
Model UT50A/B/C: OPERATING MANUAL Measurement Operation(12) Note l In a circuit, a good diode should still produce a forward voltage drop reading of 0.5V to 0.8V; however; the reverse voltage drop reading can vary depending on the resistance of other pathways between the probe tips. -
Page 25: Sleep Mode
Model UT50A/B/C: OPERATING MANUAL Sleep Mode 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. In a dim condition, the Display Backlight turns on automatically while in a... -
Page 26: General Specifications
Model UT50A/B/C: OPERATING MANUAL General Specifications l Maximum voltage between Terminals and Grounding : 1000V rms. Fused Protection for mA Input Terminal : 0.5A, 250V fast type, 5x20mm. Fused Protection for 20A Input Terminal : Un-fused. l Range : Manual ranging. -
Page 27: Accuracy Specifications
Model UT50A/B/C: OPERATING MANUAL Accuracy Specifications(1) 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 Protection UT50A UT50B UT50C 250VDCor 100 V 200mV ACrms. -
Page 28: Dc Current
Model UT50A/B/C: OPERATING MANUAL Accuracy Specifications(2) C. DC Current Accuracy Overload Range Resolution Protection UT50A UT50B UT50C 20 A 0.01 A 0.5A. 250V (0.8%+1) fast type (0.8%+1) fuse, 5x20 20mA 10 A (0.8%+1) 200mA (1.5%+1) 100 A (2%+5) Un-Fused 10mA... -
Page 29: Resistance Test
Model UT50A/B/C: OPERATING MANUAL Accuracy Specifications(3) E. Resistance Test Accuracy Overload Range Resolution Protection UT50A UT50B UT50C (0.8%+3) 250V DC (0.8%+1) or AC rms 200k (1%+2) 200M 100k [5%(reading-10)+10] Remarks: l Open circuit voltage: 700mV (At 200M range, it is approx. 2.8V) l At 200M range , test lead is in short circuit , and it is normal to display 10 digits. -
Page 30: Capacitance
Model UT50A/B/C: OPERATING MANUAL Accuracy Specifications(4) H. Capacitance Accuracy Overload Range Resolution Protection UT50A UT50B UT50C (4%+3) 10pF 20nF (4%+3) 250V AC 0.1nF 200nF (4%+3) (5%+4) 0.1 F 100 F Remarks:Testing signal:approx. 400Hz 40mV rms. When the tested capacitor is greater than 30 F, reading is for reference only. -
Page 31: Maintenance
Model UT50A/B/C: 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 32: Replacing The Battery
Model UT50A/B/C: OPERATING MANUAL Maintenance(2) 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: 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 33 Model UT50A/B/C: OPERATING MANUAL Maintenance(3) Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket. 0.5A. 250V fast type fuse, 5x20mm. Rejoin the case bottom and the case top, and install the screw and rubber feet Replacement of fuses is seldom required.
- Page 34 Model UT50A/B/C: OPERATING MANUAL Copyright 2001 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, Guang Dong Province, China Headquarters: Uni-Trend International Limited...