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UNI-T UT50E, Operating Manual

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UNI-T UT50E Operating Manual Download Page 14

14

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.

l 

In each range, the Meter has an input impedance of

      approx. 10M

Ω

. This loading effect can cause

      measurement errors in high impedance circuits. If
      the circuit impedance is less than or equal to 10k

Ω

,

      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 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 or 750V rms

 

although

readings may be obtained.

red

black

( figure 3)

Model UT50E: OPERATING MANUAL

Summary of Contents for UT50E

Page 1: ...meter Structure Functional 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 Measuring Diodes Continuity G Frequency Measurement H Temperature Measurement I Capacitance Measurement General Specifications Sleep Mode Turning on the Auto Display Backlight Accuracy Specifications A ...

Page 2: ... Capacitance 31 31 C Replacing the Fuses 32 32 32 33 Title E Resistance Test F Diodes and Continuity Test G Frequency H Temperature Maintenance A General Service B Replacing the Battery Model UT50E OPERATING MANUAL 2 ...

Page 3: ...ultimeter uses large scale of integrated circuit with double integrated A D converter as its core and has full range overload protection The multimeter 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 multimeter adopted advanced co injection technique in order to ...

Page 4: ...s carefully to see any missing or damaged part In the event you find any missing or damage please contact your dealer immediately Model UT50E OPERATING MANUAL 4 Item 1 2 3 4 Description English Operating Manual Test Lead Test Clip Point Contact Temperature Probe Qty 1 piece 1 pair 1 pair 1 piece ...

Page 5: ...n 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 electri...

Page 6: ...Meter 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 ...

Page 7: ...er 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 M...

Page 8: ...lternating Current DC Direct Current AC or DC Grounding Double Insulated Deficiency of Built In Battery Continuity Test Diode Fuse Warning Refer to the Operating Manual Conforms to Standards of European Union Model UT50E OPERATING MANUAL 8 ...

Page 9: ...meter Structure see figure 1 9 figure 1 1 LCD Display 2 Data Hold Button 3 Rotary Switch 4 Power 5 COM Input Terminal 6 20A Input Terminal 7 mA Input Terminal 8 V o C Input Terminal Model UT50E OPERATING MANUAL ...

Page 10: ...10 Functional Buttons Below table indicated for information about the functional button operations Button Operation Performed HOLD Blue Button POWER Yellow Button Model UT50E OPERATING MANUAL ...

Page 11: ...Indicator 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...

Page 12: ...Microfarad 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 UT50E OPERATING MANUAL ...

Page 13: ...nput 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 oth...

Page 14: ...put impedance of approx 10MΩ This 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 3 Warning To avoid harms to you or damag...

Page 15: ...ured value shows on the display which is effective 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 c...

Page 16: ...circuit The DC current measurement has 4 measurement positions on the rotary switch 2mA 20mA 200mA and 20A To measure current do the following 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Insert the red test lead into the mA 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 4 Break the ...

Page 17: ...he voltage between terminals and ground is greaterthan60V If the fuse burns out during measurement the Meter may be damaged or the operator himself may be hurt Use proper terminals function and range for the measurement When the testing leads are connected tothecurrentterminals donotparallelthemacrossanycircuit The AC current measurement has 3 measurement positions on the rotary switch 20mA 200mA ...

Page 18: ...5 Turn on power to the circuit The measured value shows on the display 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 testing leads and the circuit under test E Measuring Re...

Page 19: ...he test lead Then use the equation measured resistance value Y X precision readings of resistance l For high resistance 1MΩ 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 When resistance measurement has been completed disconnect the connection between the testing leads and the circuit under test Mea...

Page 20: ...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 between 0 5V and 0 8V To test out a diode out of a circuit connect the Meter as follows 1 Insert the red test lead into the V o Cterminal and the black test lead into the COM terminal 2 Set the rotary switch to F Measuring Diod...

Page 21: ... will display 1 indicating open circuit for wrong connection The unit of diode is Volt V displaying the positive connection voltage drop value 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 V o C terminal and the black test...

Page 22: ...ugh readings may be obtained When the frequency signal to be tested is higher than 30V rms the Meter cannot guarantee accuracy of the measurement The frequency measurement ranges is 20kHz To measure frequency connect the Meter as follows 1 Insert the red test lead into the VΩ o Cterminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in...

Page 23: ...tempt to measure voltages higher than 60V in DC or 30V rms in AC although readings may be obtained The temperature measurement range is from 40 o C 1000 o C To measure temperature connect the Meter as follows 1 Insert the red temperature into the VΩ o Cterminal and the black temperature probe into the COM terminal 2 Set the rotary switch to o C 3 Place the temperature probe to the object being mea...

Page 24: ...t the connection between the testing leads and te circuit under test I Capacitance Measurement see figure 9 figure 9 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 Never attempt to input over 60V in DC or 3V rms...

Page 25: ...e display Measurement Operation 13 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 l To minimize the measurement error caused by the distributed capacitor the testing lead or testing clip should be as short as possible l It is normal to take a w...

Page 26: ...The Meter can be activated by pressing the POWER two times 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 bright condition the Display Backlight turns off automatically Model UT50E OPERATING M...

Page 27: ...erature 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 Saf...

Page 28: ...28 Model UT50E OPERATING MANUAL ...

Page 29: ...s than 15 minutes l Measurement voltage drop Full range at 200mV l Frequency reaponse 40Hz 400Hz l Display effective value of sine wave mean value response Range Resolution Overload Protection Accuracy 20mA 200mA 20A 0 001mA 0 01mA 0 001A 0 5A 250V fast type fuse 5x20mm 0 8 10 Un Fused 1 2 10 2 5 10 Range Resolution Overload Protection Accuracy 2mA 20mA 200mA 20A 0 0001mA 0 001mA 0 01mA 0 001A 0 5...

Page 30: ... normal to display1000 digits During measurement subtract the1000 digits from the reading 0 1mV 0 1Ω Range Resolution Input Protection Remark Open circuit voltage approx 2 8V 250V DC or AC 70Ωbuzzer beeps continuously G Frequency 5 reading 1000 10 Range Resolution Overload Protection Accuracy 0 5 10 250V DC or AC rms 200Ω 2kΩ 20kΩ 200kΩ 2MΩ 20MΩ 200MΩ 0 01Ω 0 001kΩ 0 01kΩ 0 001MΩ 0 01MΩ 0 3 1 0 5 ...

Page 31: ...o C 400 o C 400 o C 1000 o C 1 30 0 1 o C 2 50 Accuracy Specifications 4 0 0001nF 0 001nF 0 0001µF 0 001µF Remarks Testing signal approx 400Hz 40mV rms I Capacitance Range Resolution Overload Protection Accuracy 4 10 2nF 20nF 2µF 20µF 3 40 250V AC 250V AC Model UT50E OPERATING MANUAL ...

Page 32: ...ot 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 hig...

Page 33: ...st or personal injury or damage to the Meter use specified fuses ONLY in accordance with the following procedure 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 Turn the Meter OFF 3 Remove the rubber feet and screws from the case bottom and separate the case bottom from the case top 4 Remove ...

Page 34: ...p and install the screw and rubber feet Replacement of fuses is seldom required Burning of a fuse always results from the improper operation Maintenance 3 END This operating manual is subject to change without notice Model UT50E OPERATING MANUAL ...

Page 35: ...35 Model UT50E OPERATING MANUAL ...

Page 36: ...n 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 UT50E OPERATING MANUAL ...

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