UNI-T UT50A Operating Manual Download

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Model UT50A/B/C: OPERATING MANUAL

Table of Contents

Title

Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The

multimeter Structure

Functional Buttons
Display Symbols
Measurement Operation

A. DC Voltage Measurement
B.

AC Voltage Measurement

DC Current Measurement

D.   AC Current Measurement
E. Measuring Resistance
F. The Model UT50C:
  Frequency Measurement
G.   The Model UT50B/UT50C:
Temperature Measurement
H.

Capacitance Measurement

Measuring Diodes & Continuity

General Specifications

Testing for Continuity
Sleep Mode
Turning on the Auto Display Backlight

Accuracy Specifications

A. DC

Voltage

B. AC

Voltage

DC Current

AC Current

Summary of Contents for UT50A

Page 1: ...Buttons Display Symbols Measurement Operation A DC Voltage Measurement B AC Voltage Measurement C DC Current Measurement D AC Current Measurement E Measuring Resistance F The Model UT50C Frequency Measurement G The Model UT50B UT50C Temperature Measurement H Capacitance Measurement I Measuring Diodes Continuity General Specifications Testing for Continuity Sleep Mode Turning on the Auto Display Ba...

Page 2: ...y Test 30 30 C Replacing the Fuses 31 32 32 32 Model UT50A B C OPERATING MANUAL 2 Title E Resistance Test F The Model UT50C Frequency G The Model UT50B UT50C Temperature H Capacitance Maintenance A General Service B Replacing the Battery ...

Page 3: ...r uses large scale of integrated circuit with double integrated A D converter as its core and has full range overload protection The Meter not only can measure AC DC Voltage AC DC Current Resistance Capacitance Temperature Frequency Diodes and Continuity but also has Data Hold Full Icon Display and Sleep Mode features The Meter adopted advanced co injection technique in order to provide sufficient...

Page 4: ...o see any missing or damaged part In the event you find any missing or damage please contact your dealer immediately Model UT50A B C OPERATING MANUAL 4 Item 1 2 3 4 Description English Operating Manual Test Lead Test Clip Point Contact Temperature Probe UT50B UT50C only Qty 1 piece 1 pair 1 pair 1 piece ...

Page 5: ...with smaller transient overvoltages than CAT IV Use the Meter only as specified in this operating manual otherwise the protection provided by the Meter may be impaired 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 International electrica...

Page 6: ...eter l Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and grounding l The rotary switch should be placed in the right position and no any changeover of range shall be made during measurement is conducted to prevent damage of the Meter l When the Meter working at an effective voltage over 60V in DC or 30V rms in AC special care should b...

Page 7: ... case l When servicing the Meter use only the same model number or identical electrical specifications replacement parts l The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident l Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing No abrasive and solvent should be used to prevent the surface of the Met...

Page 8: ...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 Model UT50A B C OPERATING MANUAL 8 ...

Page 9: ...figure 1 1 LCD Display 2 Data Hold Button 3 Rotary Switch 4 Other Input Terminals 5 COM Input Terminal 6 20A Input Terminal 7 The Model UT50A µAmA Input terminal The Model UT50B UT50C mA Input terminal 8 Power Model UT50A B C OPERATING MANUAL ...

Page 10: ... Press up the POWER to turn off the Meter HOLD Blue Button l Press HOLD once to enter hold mode l Press HOLD again to exit hold mode l In Hold mode is displayed and the present value is shown POWER Yellow Button Below table indicated for information about the functional button operations Model UT50A B C OPERATING MANUAL ...

Page 11: ...dicator for AC voltage or current The displayed value is the mean value 4 Indicates negative reading 5 Test of diode 6 Data hold is active 7 The continuity buzzer is on 8 Centigrade temperature o C o F 9 Fahrenheit temperature µA mA A A Amperes amps The unit of current mA Milliamp 1 x 10 3 or 0 001 amperes µA Microamp 1x 10 6 or 0 000001 amperes 10 V Volts The unit of voltage mV Millivolt 1 x 10 3...

Page 12: ...crofarad 1 x 10 6 or 0 000001 farads nF Nanofarad 1x10 9 or0 000000001 farads kHz 13 The unit of frequency in cycles second Kilohertz 1 x 10 3 or 1 000 hertz Ω Ohm The unit of resistance kΩ kilohm 1 x 103 or 1000 ohms MΩ Megaohm 1 x 106 or 1 000 000 ohms Ω kΩ MΩ 14 Model UT50A B C OPERATING MANUAL ...

Page 13: ...t terminal and the black test lead into the COM input terminal 2 Set the rotary switch to an appropriate measurement position in V range 3 Connect the test leads across with the object being measured The measured value shows on the display 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 otherw...

Page 14: ...ut impedance of approx 10MΩThis loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kΩ the error is negligible 0 1 or less l When DC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test B AC Voltage Measurement see figure 4 Warning To avoid harms to you or damages...

Page 15: ...e value of sine wave mean value response Note l 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 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 l In each range the Meter has an i...

Page 16: ...sting 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 20µA 2mA 200mA and 20A The Model UT50B The DC current measurement has 4 measurement positions on the rotary switch 2mA 20mA 200mA and 20A The Model UT50C The DC current measurement has 3 measurement positions on the r...

Page 17: ...more negative side of the break 5 Turn on power to the circuit The measured value shows on the display Measurement Operation 5 Note l If the value of current to be measured is unknown use the maximum measurement position 20A and 20A terminal and reduce the range step by step until a satisfactory reading is obtained l When current measurement has been completed disconnect the connection between the...

Page 18: ...t to be measured is unknown use the maximum measurement position 20A and 20A terminal and reduce the range step by step until a satisfactory reading is obtained l When current measurement has been completed disconnect the connection between the testing leads and the circuit under test To measure current do the following 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Insert...

Page 19: ...erminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position inΩ range 3 Connect the test leads across with the object being measured The measured value shows on the display Note l The test leads can add 0 1Ωto 0 3Ω of error to the resistance measurement To obtain precision readings in low resistance that is the range of 200Ω short circuit th...

Page 20: ...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 When the frequency signal to be tested is higher than 30V rms the Meter cannot guarantee accuracy of the measurement figure 8 red black The frequency measurement ranges are 2kHz and 20kHz To measure frequency connect the Meter as follows 1 Insert the red test lead int...

Page 21: ...temperature measurement range is from 40 o C 1000 o C or 40 o F 1832 o F To measure temperature connect the Meter as follows Note l The Meter automatically displays the temperature value inside the Meter when there is no temperature probe connection Measurement Operation 9 1 Insert the red temperature into the VΩ terminal and the black temperature probe into the COM terminal 2 Set the rotary switc...

Page 22: ...ement positions on the rotary switch 2nF 20nF 2µF and 100µF The Model UT50B UT50C Capacitance measurement has 4 measurement positions on the rotary switch 20nF 200nF 2µF and 100µF To measure capacitance connect the Meter as follows 1 Insert the red test clip or red test lead into the VΩ terminal and the black test clip or black test lead into the µmA The Model UT50A or mA The Model UT50B UT50C ter...

Page 23: ...age to the Meter or to the equipment under test disconnect circuit power and discharge all high voltage capacitors before measuring diodes and continuity Testing Diodes Use the diode test to check diodes transistors and other semiconductor devices The diode test sends a current through the semiconductor junction and then measures the voltage drop across the junction A good silicon junction drops b...

Page 24: ...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 VΩ terminal and the black test lead into the COM terminal 2 Set the rotary switch to 3 Connect the test leads across with the object being measured The buzzer sounds if the resistance of a circuit unde...

Page 25: ...or 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 bright condition the Display Backlight turns off automatically Model UT50A B C OPERATING MANUAL ...

Page 26: ...e Operating 0 o C 40 o C 32 o F 104 o F Storage 10 o C 50 o C 14 o F 122 o F l Relative Humidity 75 0 o C 30 o C 50 31 o C 40 o C l Altitude Operating 2000m Storage 10000m l Battery Type 9V NEDA1604 or 6F22 or 006P l Battery Deficiency Display l Data Holding Display l Negative reading Display l Overloading Display 1 l Dimensions HxWxL 165x80x38 3mm l Weight Approx 275g battery included l Safety Co...

Page 27: ...V Remarks l Input impedance 10MΩ l Frequency response 40Hz 400Hz l Display effective value of sine wave mean value response 200mV 2V 20V 200V 1000V 100µV 1mV 10mV 100mV 1V Range Resolution 0 5 1 Overload Protection UT50A UT50B UT50C Accuracy 250VDCor ACrms 0 8 2 1000V DC or 750VAC rms 100µV 1mV 10mV 100mV 1V Range Resolution 1 2 3 Overload Protection UT50A UT50B UT50C Accuracy 250V DC or AC rms 0 ...

Page 28: ... 15 minutes l Measurement voltage drop Full range at 200mV D AC Current Range Resolution 1 3 Overload Protection UT50A UT50B UT50C Accuracy 3 5 1 8 3 200µA 2mA 20mA 200mA 20A 0 1µA 1µA 10µA 100µA 10mA 1 3 0 5A 250V fast type fuse 5x20 mm Un Fused Remarks l At 20A Range For continuous measurement 10 seconds and interval not less than 15 minutes l Measurement voltage drop Full range at 200mV l Frequ...

Page 29: ... is in short circuit and it is normal to display 10 digits During measurement subtract the 10 digits from the reading F The Model UT50C Frequency Remarks Input Sensitivity 200mV G The Model UT50B UT50C Temperature Range Resolution 3 3 Overload Protection UT50B UT50C Accuracy 250V AC 40 o C 0 o C 0 o C 400 o C 400 o C 1000 o C 40 o F 32 o F 32 o F 752 o F 752 o F 1832 o F 1 3 2 5 3 4 1 4 1 5 15 1 o...

Page 30: ...10pF 0 1nF 1nF 0 1µF 5 4 4 3 250V AC Remarks Testing signal approx 400Hz 40mV rms When the tested capacitor is greater than 30 µF reading is for reference only I Diodes and Continuity Test 1mV 1Ω Range Resolution Input Protection Remark Open circuit voltage approx 2 8V 250V DC or AC 70Ωbuzzer beeps continuously Model UT50A B C OPERATING MANUAL ...

Page 31: ... get water inside the case A General Service l Periodically wipe the case with damp cloth and mild detergent Do not use chemical solvent l To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings l Turn the Meter OFF when it is not in use and take out the battery when not using for a long time l Do not store the Meter in place of humidity high ...

Page 32: ...attery with a new 9V battery NEDA 1604 or 6F22 or 006P 6 Rejoin the battery compartment and the case bottom and install the screw and rubber feet C Replacing the Fuses 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 Disconnect the connection between the testing...

Page 33: ...ows and make sure the fuse is fixed firmly in the bracket 0 5A 250V fast type fuse φ 5x20mm 2 Rejoin the case bottom and the case top and install the screw and rubber feet Replacement of fuses is seldom required Burning of a fuse always results from the improper operation END This operating manual is subject to change without notice ...

Page 34: ...Dong Guan City Guang Dong Province China Headquarters Uni Trend International Limited Address 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 http www uni trend com Copyright 2001 Uni Trend International Limited All rights reserved Model UT50A B C OPERATING MANUAL ...

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