UNI-T ut71c Operating Manual
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UNI-T ut71c Operating Manual

UNI-T ut71c Operating Manual

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Model UT71C/D/E
OPERATING MANUAL

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  • Page 1 Model UT71C/D/E OPERATING MANUAL...

  • Page 3: Table Of Contents

    Model UT71C/D/E: OPERATING MANUAL TABLE OF CONTENTS CHAPTER TITLE PAGE Before You Start Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols Getting Acquainted Turning the Meter On Battery Considerations Automatic Power Off Automatic Backlight Off Low Battery Indication...
  • Page 4 Model UT71C/D/E: OPERATING MANUAL CHAPTER TITLE PAGE Analogue Bar Graph Using MAX MIN Making Measurements Introduction A. Measuring Voltages B. Measuring Currents C. Measuring Resistance D. Testing for Continuity E. Testing Diodes F. Measuring Capacitance G. Measuring Frequency / Duty Cycle H.
  • Page 5 Model UT71C/D/E: OPERATING MANUAL CHAPTER TITLE PAGE Changing the Default Setting Introduction Selecting Setup Options Maintenance A. General Service B. Replacing the Fuses C. Replacing the Battery Specifications Safety and Compliances Physical Specifications General Specifications Feature Summary Basic Specifications Detailed Accuracy Specifications A.
  • Page 6 Model UT71C/D/E: OPERATING MANUAL CHAPTER TITLE PAGE E. Resistance F. Continuity Test G. Diode Test H. Capacitance I. Frequency J. Temperature Degrees Celsius Fahrenheit K. 4~20mA loop current L. Power Measurement...

  • Page 7: Before You Start

    “Safe ty Infor m a t i o n ” and “Rules for Safe Operat i o n ” carefu l l y before using the Meter. Digital Multimeter UT71C/D/E (hereafter referred to as “the Meter”) is a 40000 counts and 4 3/4 digits with steady operations, fashionable structure and auto ranging instrument.

  • Page 8: Unpacking Inspection

    Model UT71C/D/E: OPERATING MANUAL Unpa c k i n g Inspe c t i o n Open the package case and take out the Meter. Check the items shown on Table 1-1 carefully to see any missing or damaged part: Table 1-1.

  • Page 9: Safety Information

    Model UT71C/D/E: OPERATING MANUAL Safet y Inform a t i o n Rules For Safe Opera t i o n This Meter complies with the standards IEC61010 safety Warnin g measurement requirement: in pollution degree 2, To avoid possibl e elect r i c shoc k or personal injur y, overvoltage category (CAT.
  • Page 10 Model UT71C/D/E: OPERATING MANUAL l When the Meter wor k i n g at an effec t i v e volt age over l When servi c i n g the Meter, use only the same model 60V in DC or 30V rms in AC, speci a l care should be numbe r or identi c a l elec t r i c a l speci f i c a t i o n s take n for there is danger of elec t r i c shoc k.

  • Page 11: International Electrical Symbols

    Model UT71C/D/E: OPERATING MANUAL Inter na t i o n a l Elec t r i c a l Symbols Symbols used on the Meter and in this manual are explained in Table1-2. Table 1-2. Inte rn a t i o n a l Elec tr i c a l Symbols...

  • Page 12: Getting Acquainted

    Model UT71C/D/E: OPERATING MANUAL The automatic power off is preset to 10 minutes. From Chapt er 2 the Setup menu (see Chapter 5), you could specify a Gett in g Acquain t e d time (10 minutes, 20 minutes, 30 minutes or OFF). If you set to OFF, the Meter retains on until you turn the rotary switch to OFF or the battery becomes too weak.

  • Page 13: Low Battery Indication

    Model UT71C/D/E: OPERATING MANUAL Low Bat t e r y Indic a t i o n A constant battery icon ( ) in the upper left corner of the display notifies you that the batteries are low and should be replaced.

  • Page 14: Rotary Switch

    Model UT71C/D/E: OPERATING MANUAL Rotary Swit c h Turn the Meter on by selecting any measurement function. The Meter presents a standard display for that function. The display may also be influenced by some of the choices made in Setup.
  • Page 15 (UT71C/D only) l Frequency signal duty cycle measurement (UT71E only) DC millivoltage measurement None Resistance measurement l Diode test l Continuity test W (UT71E only) Power measurement None Capacitance measurement None Fahrenheit temperature measurement ºC ºF(UT71C/D only) Centigrade temperature measurement...
  • Page 16 Model UT71C/D/E: OPERATING MANUAL Rotary Rotary Swit c h Funct i o n Blue Key Func ti o n Swit c h Positi o n l Fahrenheit temperature measurement Centigrade temperature measurement Hz % ºC ºF l Frequency measurement (UT71E only) l Frequency signal duty cycle measurement AC or DC current measurement (400µA ,4000µA) Toggle between AC or DC current...

  • Page 17: Functional Buttons

    Model UT71C/D/E: OPERATING MANUAL Func t i o n a l But t o n s The buttons activate features that augment the function selected with the rotary switch. The buttons are shown in Table 2-2. RECALL STORE Press the button once to access the main feature (e.g. STORE).
  • Page 18 Model UT71C/D/E: OPERATING MANUAL Table 2-2. Funct i o n a l But to n s But to n Descri p t i o n Acces s Meth od Range feature: Press the button once. Exit AUTO and enter MANUAL ranging. In MANUAL, select SETUP next input range.
  • Page 19 Model UT71C/D/E: OPERATING MANUAL Table 2-2. Funct i o n a l But to n s But t o n Descri p t i o n Acce ss Metho d RECALL Recall feature: Press and hold the button for over 1 STORE Recall the stored value.
  • Page 20 Model UT71C/D/E: OPERATING MANUAL Table 2-2. Func ti o n a l Butt o n s But to n Descrip t i o n Acces s Meth od Press to exit certain button functions and the Meter will return Press the button once.
  • Page 21 Model UT71C/D/E: OPERATING MANUAL Table 2-2. Funct i o n a l But to n s But t o n Descri p t i o n Acce ss Metho d SEND In Store, each press to decrease a second on the storing MAXMIN interval.
  • Page 22 Model UT71C/D/E: OPERATING MANUAL Table 2-2. Funct i o n a l But to n s But t o n Descri p t i o n Acce ss Metho d When it is at AC measurement mode, press the button to...

  • Page 23: The Meter Functions Vs Displays

    Model UT71C/D/E: OPERATING MANUAL The Meter Func t i o n s Vs Displays Table 2-3 shows the cross reference of function and display: Table 2-3 Func ti o n s Vs Displays Funct i o n Primar y Displa y...
  • Page 24 Model UT71C/D/E: OPERATING MANUAL Table 2-3 Func ti o n s Vs Displays Funct i o n Primar y Displa y Right Second a r y Displa y Left Second ar y Display Full range: 400, 4000 The tested ACµA value The tested frequency value: ACµA...
  • Page 25 Model UT71C/D/E: OPERATING MANUAL Table 2-3 Func ti o n s Vs Displays Funct i o n Primar y Displa y Right Second a r y Displa y Left Second a r y Display Index number: The recalled value The total number of stored value.
  • Page 26 Model UT71C/D/E: OPERATING MANUAL Selec t i n g the Range Press RANGE to select either a fixed range or the autorange feature. Autoranging (AUTO lighted in the display) always comes on initially when you select a new function. In autorange,...
  • Page 27 Model UT71C/D/E: OPERATING MANUAL Table 2-4. Display Featur e s Symbol Meanin g Maximum reading displayed. Minimum reading displayed Average reading displayed The sequence of the reading. Degrees Celsius (default) or Fahrenheit. ºC, ºF H: Hour HµmS µ: Micro m: Minutes (Milli)
  • Page 28 Model UT71C/D/E: OPERATING MANUAL Table 2-4. Display Featur e s Symbol Meanin g Indicator for True RMS value. TrueRMS For DCV and DCA functions, reading represents the True RMS total of AC and AC+DC DC measurements : Ohm. The unit of resistance.
  • Page 29 Model UT71C/D/E: OPERATING MANUAL Table 2-4. Display Featur e s Symbol Meanin g Farad. The unit of capacitance nF,µF, nF: Nanofarad. 1 x 10-9 or 0.000000001 farads. µF:Microfarad.1 x 10-6 or 0.000001 farads. mF: Millifarad. 1 x 10-3 or 0.001 farads.
  • Page 30 Model UT71C/D/E: OPERATING MANUAL Table 2-4. Display Featur e s Symbol Meanin g Backlight feature is on Data hold mode is active HOLD Peak hold mode is active PEAK HOLD Diode test l Frequency signal duty cycle. l 4~20mA loop current as % reading The input value is too large for the selected range.

  • Page 31: Analogue Bar Graph

    Model UT71C/D/E: OPERATING MANUAL the right secondary display. The primary display shows Analogue Bar Graph the maximum value. The bar graph provides an analogue indication of the measured input. For most measurement functions, the Press MAX MIN the third time, the current measurement bar graph updates 10 times per second.

  • Page 32: Making Measurements

    Model UT71C/D/E: OPERATING MANUAL Chapt er 3 Making Measure m e n t Intro du c t i o n Chapter 3 explains how to make measurements. Most measurement functions can be selected by using the rotary switch. While letters or symbols identify primary functions; blue letters or symbols identify alternative functions.
  • Page 33 Model UT71C/D/E: OPERATING MANUAL 1. Insert the red test lead into the V terminal and the Note l When measuring voltage, the Meter acts around a black test lead into the COM terminal. 10M ( ) or 2.5G ( ) impedance in 2.

  • Page 34: Measuring Currents

    Model UT71C/D/E: OPERATING MANUAL B. Measuri n g Curren t s Warnin g If the fuse burns out during measure m e n t , the Meter may be damag ed or the opera to r himsel f may be hur t.
  • Page 35 Model UT71C/D/E: OPERATING MANUAL 1. Turn off power to the circuit. Discharge all high- When a ACA function is selected, you can press the voltage capacitors. Yello w Butt o n to view the AC + DC True RMS value 2.

  • Page 36: Measuring Resistance

    Model UT71C/D/E: OPERATING MANUAL C. Measur in g Resist a n c e Warning To avoid harms to you, please do not atte m p t to inpu t vol ta g e higher than 60V DC or 30V rms AC.

  • Page 37: Testing For Continuity

    Model UT71C/D/E: OPERATING MANUAL Note D. Testi n g for Continu i t y l When measuring low resistance, the test leads can Warnin g add 0.1 to 0.2 of error to resistance measurement. To avoid harm s to you, please do not atte m p t to input To test the leads, touch the probe tips together and read the resistance of the leads.
  • Page 38 Model UT71C/D/E: OPERATING MANUAL Note l Open circuit voltage around –1.2V and range is 400 measurement range. l When continuity testing has been completed, disconnect the connection between the testing leads and the circuit under test and remove the test leads away from the input terminals.

  • Page 39: Testing Diodes

    Model UT71C/D/E: OPERATING MANUAL E. Testi n g Diodes Warnin g To avoid harm s to you, please do not atte m p t to input voltag e s higher than 60V DC or 30V rms AC. To avoid damage s to the Meter or to the devi ce s under test, disco nn e c t circu i t powe r and discha r g e all the high- vol ta ge capa ci t o r s before testi n g diodes.
  • Page 40 Model UT71C/D/E: OPERATING MANUAL l When diode testing has been completed, disconnect 3. For forward voltage drop readings on any the connection between the testing leads and the semiconductor component, place the red test lead on circuit under test and remove the test leads away the component’s anode and place the black test lead...

  • Page 41: Measuring Capacitance

    Model UT71C/D/E: OPERATING MANUAL F. Measur in g Capa ci t a n c e Warnin g To ensure accur a c y, the Meter inside is disch a r g e d agains t the teste d capa ci t o r . “DIS.C” will be sho w n on the display when it is under disch a r g i n g, this proce ss will be qui te slo w.
  • Page 42 Model UT71C/D/E: OPERATING MANUAL l When capacitance measurement has been 2. Set the rotary switch tomeasurement mode, completed, disconnect the connection between the the Meter may display a fixed reading which is a testing leads and the circuit under test and remove internal distributed capacitor value.

  • Page 43: Measuring Frequency / Duty Cycle

    Meter as Figure 3-7 and do the following: 1. Insert the red test lead into the Hz terminal and the black test lead into the COM terminal. 2. Set the rotary switch to(UT71C/D) or (UT71E) and press BLUE button to select the ºC ºF Hz measurement mode for frequency measurement or % for duty cycle measurement.
  • Page 44 Model UT71C/D/E: OPERATING MANUAL Note l The requirement of Input amplitude “a” is as follows: When 10Hz~40MHz: 200 mVa30Vrms; > 40MHz: Un-specified l When Hz measurement has been completed, disconnect the connection between the testing leads and the circuit under test and remove the test leads...

  • Page 45: Measuring Temperature

    Model UT71C/D/E: OPERATING MANUAL H. Measu r in g Tempe r a t u r e Warning To avoid harms to you, please do not atte m p t to inpu t volta g e s higher than 60V DC or 30V rms AC.

  • Page 46: 4~20Ma Loop Current As % Readout

    Model UT71C/D/E: OPERATING MANUAL 2. The rest procedure, please follow B. Measuring Note Current: DC current measurement (Figure 3-2). l Place the Meter in an environment of 18ºC~23ºC 3. When the readings obtained is: otherwise false reading may be obtained especially l <...

  • Page 47: Power Measurement

    Model UT71C/D/E: OPERATING MANUAL J. Power Measur e m e n t Warnin g To avoid damage s to the Meter, please do not atte m p t to input higher than 250V from outle t altog e t h e r readi ng may be obtai ne d.
  • Page 48 Model UT71C/D/E: OPERATING MANUAL Note l The current of the object being measured must > 10A. 5A continuous measurement is allowed. l 5A~10A, only 10 seconds continuous measurement is allowed and the interval between each measurement must be greater than 15 minutes.

  • Page 49: Using Stores, Recall And Send Features

    The maximum number of stored reading is 100 (for To store readings, proceed as follows: UT71C and UT71E) and 9999 (for UT71D). When l Press STORE once, STO and “no.xxxx” appears to the stored readings memory is full, the Meter will stop confirm the operation and the left secondary display storing data.

  • Page 50: Recalling Stored Readings

    Model UT71C/D/E: OPERATING MANUAL Recalli n g Stored Readings Using Send When using a Send feature, please refer to the Installation Use the following procedure to recall the stored reading: Guide of the included CD-ROM. l Press RECALL to recall the stored value and RCL appears to confirm the operation.

  • Page 51: Changing The Default Setting

    Model UT71C/D/E: OPERATING MANUAL Each Setup Selection and Option appears in the primary Chapte r 5 display in the sequence shown in Table 5-1. Changing the Defaul t Set ti ng Intro du c t i o n The Meter allows you to change the default operating configuration of the Meter by changing setup options made at the factory.
  • Page 52 Model UT71C/D/E: OPERATING MANUAL Table 5-1. Setup Selec t i o n s Sele c t i o n Option Facto r y Defaul t Descri p t i o n Max. 40000. Press to select OFF Over the upper limits, beeps not...
  • Page 53 Model UT71C/D/E: OPERATING MANUAL Table 5-1. Setup Selec t i o n s Sele c t i o n Optio n Facto r y Defaul t Descrip t i o n Zero is in the Analog u e Zero is in the left hand side.

  • Page 54: Maintenance

    Model UT71C/D/E: OPERATING MANUAL Chapter 6 Maint e n a n c e This chapter provides basic maintenance information including battery and fuse replacement instruction. Warnin g Do not atte m p t to repair or servi ce your Meter unless you are quali fi e d to do so and have the relevan t calibra t i o n, perfor m a n c e test, and servi ce infor m a t i o n .

  • Page 55: Replacing The Fuses

    Model UT71C/D/E: OPERATING MANUAL B. Replac i n g the Fuses Warnin g To avoid elect r i c a l shoc k or arc blast, or persona l injur y or damag e to the Meter, use specif i e d fuses ONLY in acco rd a n c e wit h the follo w i n g proced u r e.

  • Page 56: Replacing The Battery

    Model UT71C/D/E: OPERATING MANUAL C. Repla c i n g the Batt e r y Warnin g To avoid false reading s, whi ch could lead to possibl e elec tr i c shoc k or personal injury, repla ce the bat te r y as soon as the batt e r y indica t o r “”...

  • Page 57: Specifications

    Model UT71C/D/E: OPERATING MANUAL Chapter 7 Specifi c a t i o n s Safet y and Complia n c e s Maximum Voltage between any Terminal and Grounding Refer to different range input protection voltage Certification IEC 61010 CAT.III 1000V, CAT.IV 600V overvoltage and...

  • Page 58: Physical Specifications

    Model UT71C/D/E: OPERATING MANUAL Physic a l Specif i c a t i o n s Digital: 40000 counts on primary display; updates 2-3 Display (LCD) times / second. 4000 counts on two secondary displays. Analog: 40 segments; updates 10 times / second.

  • Page 59: General Specifications

    Model UT71C/D/E: OPERATING MANUAL Genera l Specifi c a t i o n s Auto Range Auto Polarity Overloading Display OL (except at 4~20mA Loop range which display HI or LO) Display Battery Deficiency...

  • Page 60: Feature Summary

    Model UT71C/D/E: OPERATING MANUAL Featur e Summar y Primary: 40,000 counts Tri Digital Displays Left Secondary: 4000 counts Analogue Bar Graph Right Secondary: 4000 counts Bar Graph: 40 segments, updates 10 times / second Bright backlight for clear readings in poorly lighted areas.

  • Page 61: Basic Specifications

    0 to 40mF Frequency 0~400MHz Temperature -40ºC~1000ºC (-40ºF~1832ºF) STORE Readings Up to 100 readings for UT71C and UT71E or 9999 readings for UT71D may be saved by the user in a memory. These readings may be viewed by using Recall feature.

  • Page 62: Detailed Accuracy Specifications

    Model UT71C/D/E: OPERATING MANUAL Detail ed Accur a c y Specif i c a t i o n s Accuracy: ([% of reading] + [number of least significant digits), guarantee for 1 year. Operating temperature: 18ºC~28ºC Relative humidity: 75%RH A. DC Volta ge...

  • Page 63: Ac Voltage

    Model UT71C/D/E: OPERATING MANUAL B. AC Volta g e (AC+DC measur e m e n t is availa b le ) Range Resolu ti o n Band w i d t h Accu r a c y 0.0001V 45Hz~1kHz (0.4%+30) 1kHz~10kHz (1.5%+30)
  • Page 64 Model UT71C/D/E: OPERATING MANUAL Remar k s: l Input Impedance: Approx 10M . l Overload Protection: 1000V. l Display: a) True rms are valid from 10% of range to 100% of range b) AC crest factor can be up to 3.0 except 1000V where it is 1.5.

  • Page 65: Dc Current

    Model UT71C/D/E: OPERATING MANUAL C. DC Curren t Range Resolu ti o n Accu r a c y Overloa d Prote c t i o n 400µA 0.01µA (0.1%+15) 0.5A, 250V, fast type fuse, 5×20mm 4000µA 0.1µA 40mA 0.001mA (0.15%+15) 400mA 0.01mA...

  • Page 66: Ac Current

    Model UT71C/D/E: OPERATING MANUAL D. AC Curren t (AC+DC measur e m e n t is availab l e) Range Resolu ti o n Band w i d t h Accu r a c y Overloa d Prote c t i o n 45Hz~1kHz 400µA...
  • Page 67 Model UT71C/D/E: OPERATING MANUAL E. Resist a n c e Range Resolu ti o n Accu r a c y Overloa d Prote c t i o n 0.01 (0.3%+8)+test leads open circuit value 0.0001k (0.3%+8) 0.001k 1000V (0.5%+20) 400k 0.01k...
  • Page 68 Model UT71C/D/E: OPERATING MANUAL G. Diode Test Range Resolu t i o n Overloa d Prote c t i o n 0.0001V 1000V Remar k s: l Open circuit voltage approximate 2.8V. l A good silicon junction drops between 0.5V and 0.8V.
  • Page 69 Model UT71C/D/E: OPERATING MANUAL I. Freque n c y Range Resolu t i o n Accu r a c y Overloa d Prote c t i o n 40Hz 0.001Hz 400Hz 0.01Hz 4kHz 0.0001kHz 40kHz 0.001kHz (0.01%+8) 1000V 400kHz 0.01kHz 4MHz 0.0001MHz...
  • Page 70 Model UT71C/D/E: OPERATING MANUAL J. Temp er a t u r e Degree s Celsius Range Resolu t i o n Accu r a c y Overloa d Prote c t i o n -40ºC~40ºC (3%+30) 1000V 40ºC~400ºC (1%+30) 0.1ºC 400ºC~1000ºC...
  • Page 71 Model UT71C/D/E: OPERATING MANUAL K. 4~20 mA loop curre n t Range Resolu t i o n Accur a c y Overloa d Prote c t i o n (4~20mA)% 0.01% (1%+50) 0.5A, 250V, fast type fuse, 5×20mm Remar k s: When the readings obtained is: l <...
  • Page 72 Model UT71C/D/E: OPERATING MANUAL This operating manual is subject to change without notice. Copyright 2005 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...

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