UNI-T UT71C Operating Manual
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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 2: 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 3 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 4 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 5 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 6: Before You Start

    To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safe Operation” carefully 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. They all not only...

  • Page 7: Unpacking Inspection

    Model UT71C/D/E: OPERATING MANUAL Unpacking Inspection 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. Unpacking Inspection Item Description 1 piece English Operating Manual...

  • Page 8: Safety Information

    Model UT71C/D/E: OPERATING MANUAL Safety Information Rules For Safe Operation This Meter complies with the standards IEC61010 safety Warning measurement requirement: in pollution degree 2, To avoid possible electric shock or personal injury, overvoltage category (CAT. III 1000V, CAT.IV 600V) and to avoid possible damage to the Meter or to the and double insulation.
  • Page 9 Model UT71C/D/E: OPERATING MANUAL When the Meter working at an effective voltage over When servicing the Meter, use only the same model 60V in DC or 30V rms in AC, special care should be number or identical electrical specifications taken for there is danger of electric shock.

  • Page 10: International Electrical Symbols

    Model UT71C/D/E: OPERATING MANUAL International Electrical Symbols Symbols used on the Meter and in this manual are explained in Table1-2. Table 1-2. International Electrical Symbols AC or DC DC Measurement AC Measurement Grounding Double Insulated Warning. Refer to the Operating Manual...

  • Page 11: Getting Acquainted

    Model UT71C/D/E: OPERATING MANUAL Chapter 2 Getting Acquainted Turning the Meter On The automatic power off is preset to 10 minutes. From the Setup menu (see Chapter 5), you could specify a To turn the Meter on, turn the rotary switch from OFF time (10 minutes, 20 minutes, 30 minutes or OFF).

  • Page 12: Low Battery Indication

    Model UT71C/D/E: OPERATING MANUAL Low Battery Indication A constant battery icon ( ) in the upper left corner of the display notifies you that the batteries are low and should be replaced. Warning To avoid false readings, which could lead to possible...

  • Page 13: Rotary Switch

    Model UT71C/D/E: OPERATING MANUAL Rotary Switch 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. Use the blue button to select any rotary switch alternate function (labeled in blue letters).
  • Page 14 Model UT71C/D/E: OPERATING MANUAL Table 2-1. Rotary Switch Selections Rotary Rotary Switch Function Blue Key Function Switch Position Turn the Meter off None (UT71C/D only) DC voltage measurement None (UT71C/D only) AC voltage measurement None DC voltage measurement Toggle between AC or DC voltage measurement...
  • Page 15 Model UT71C/D/E: OPERATING MANUAL Rotary Rotary Switch Function Blue Key Function Switch Position Centigrade temperature measurement Fahrenheit temperature measurement Hz % ºC ºF Frequency measurement (UT71E only) Frequency signal duty cycle measurement µA AC or DC current measurement (400µA ,4000µA)

  • Page 16: Functional Buttons

    Model UT71C/D/E: OPERATING MANUAL Functional Buttons 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). To access the first additional feature of the button (e.g. RECALL), press and hold the button for over 1 second to access this additional feature.
  • Page 17 Model UT71C/D/E: OPERATING MANUAL Table 2-2. Functional Buttons Button Description Access Method Range feature: Press the button once. Exit AUTO and enter MANUAL ranging. In MANUAL, select SETUP next input range. EXIT to return to AUTO. AUTO is default. RANGE...
  • Page 18 Model UT71C/D/E: OPERATING MANUAL Table 2-2. Functional Buttons Button Description Access Method RECALL Recall feature: Press and hold the button for over 1 STORE Recall the stored value. Press EXIT to exit the Recall feature. second Setup feature: Press the button In Setup, press to select OFF at the selection of HIGH and once after entering Setup mode.
  • Page 19 Model UT71C/D/E: OPERATING MANUAL Table 2-2. Functional Buttons Button Description Access Method Press to exit certain button functions and the Meter will return Press the button once. LIGHT EXIT to the factory default setting. Press to turn the backlight on. It is possible to toggle between...
  • Page 20 Model UT71C/D/E: OPERATING MANUAL Table 2-2. Functional Buttons Button Description Access Method SEND In Store, each press to decrease a second on the storing MAXMIN interval. Press EXIT to exit Press to enter relative mode, the primary display shows Press the button once.
  • Page 21 Model UT71C/D/E: OPERATING MANUAL Table 2-2. Functional Buttons Button Description Access Method When it is at AC measurement mode, press the button to Press the button once AC+DC display AC+DC True RMS value in the primary display and the Yellow Button left secondary display “AC+DC”.

  • Page 22: The Meter Functions Vs Displays

    Model UT71C/D/E: OPERATING MANUAL The Meter Functions Vs Displays Table 2-3 shows the cross reference of function and display: Table 2-3 Functions Vs Displays Function Primary Display Right Secondary Display Left Secondary Display Full range: 4, 40, 400, 1000 The tested DC voltage value...
  • Page 23 Model UT71C/D/E: OPERATING MANUAL Table 2-3 Functions Vs Displays Function Primary Display Right Secondary Display Left Secondary Display Full range: 400, 4000 ACµA The tested ACµA value The tested frequency value: 45.00Hz~10.00kHz Full range: 40, 400 DCmA The tested DCmA value...
  • Page 24 Model UT71C/D/E: OPERATING MANUAL Table 2-3 Functions Vs Displays Function Primary Display Right Secondary Display Left Secondary Display Index number: The recalled value The total number of stored value. no.0001~no.0100 (For UT71C/UT71E) no.0001~no.9999 (For UT71D) MAX MIN Chapter 2 Getting Acquainted – Using MAX MIN The present measurement value.

  • Page 25: Selecting The Range

    Model UT71C/D/E: OPERATING MANUAL Selecting 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, the Meter selects the lowest input range possible, ensuring that the reading appears with the highest available resolution.
  • Page 26 Model UT71C/D/E: OPERATING MANUAL Table 2-4. Display Features Symbol Meaning Maximum reading displayed. Minimum reading displayed The sequence of the reading. ºC, ºF Degrees Celsius (default) or Fahrenheit. Indicates negative reading 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 27 Model UT71C/D/E: OPERATING MANUAL Table 2-4. Display Features Symbol Meaning TrueRMS Indicator for True RMS value. AC+DC For DCV and DCA functions, reading represents the True RMS total of AC and DC measurements , k , M : Ohm. The unit of resistance.
  • Page 28 Model UT71C/D/E: OPERATING MANUAL Table 2-4. Display Features Symbol Meaning nF,µF, Farad. The unit of capacitance 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 29 Model UT71C/D/E: OPERATING MANUAL Table 2-4. Display Features Symbol Meaning Backlight feature is on HOLD Data hold mode is active PEAK HOLD Peak hold mode is active Diode test Frequency signal duty cycle. 4~20mA loop current as % reading The input value is too large for the selected range.

  • Page 30: Analogue Bar Graph

    Model UT71C/D/E: OPERATING MANUAL Analogue Bar Graph the right secondary display. The primary display shows 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 31: Making Measurements

    Model UT71C/D/E: OPERATING MANUAL Chapter 3 Making Measurement Introduction 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. Press the BLUE button to access these alternate functions.
  • Page 32 Model UT71C/D/E: OPERATING MANUAL Insert the red test lead into the V terminal and the Note black test lead into the COM terminal. When measuring voltage, the Meter acts around a Set the rotary switch to (UT71C/D) 10M ( ) or 2.5G (...

  • Page 33: Measuring Currents

    Model UT71C/D/E: OPERATING MANUAL B. Measuring Currents Warning If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be hurt. To avoid possible damage to the Meter or to the equipment under test, check the Meter’s fuses before measuring current.
  • Page 34 Model UT71C/D/E: OPERATING MANUAL Turn off power to the circuit. Discharge all high- When a ACA function is selected, you can press the voltage capacitors. Yellow Button to view the AC + DC True RMS value Insert the red test lead into the mAµA or A terminal in the primary display.

  • Page 35: Measuring Resistance

    Model UT71C/D/E: OPERATING MANUAL C. Measuring Resistance Warning To avoid harms to you, please do not attempt to input voltage higher than 60V DC or 30V rms AC. To avoid possible damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring resistance.

  • Page 36: Testing For Continuity

    Model UT71C/D/E: OPERATING MANUAL Note D. Testing for Continuity When measuring low resistance, the test leads can Warning add 0.1 to 0.2 of error to resistance measurement. To avoid harms to you, please do not attempt to input To test the leads, touch the probe tips together and voltage higher than 60V DC or 30V rms AC.
  • Page 37 Model UT71C/D/E: OPERATING MANUAL Note Open circuit voltage around –1.2V and range is 400 measurement range. 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 38: Testing Diodes

    Model UT71C/D/E: OPERATING MANUAL E. Testing Diodes Warning To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V rms AC. To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before testing diodes.
  • Page 39 Model UT71C/D/E: OPERATING MANUAL l When diode testing has been completed, disconnect For forward voltage drop readings on any semiconductor component, place the red test lead on the connection between the testing leads and the the component’s anode and place the black test lead circuit under test and remove the test leads away on the component’s cathode.

  • Page 40: Measuring Capacitance

    Model UT71C/D/E: OPERATING MANUAL F. Measuring Capacitance Warning To ensure accuracy, the Meter inside is discharged against the tested capacitor. “DIS.C” will be shown on the display when it is under discharging, this process will be quite slow. To avoid damage to the Meter or to the equipment...
  • Page 41 Model UT71C/D/E: OPERATING MANUAL Set the rotary switch to measurement mode, When capacitance measurement has been the Meter may display a fixed reading which is a completed, disconnect the connection between the internal distributed capacitor value. For testing less testing leads and the circuit under test and remove...

  • Page 42: Measuring Frequency / Duty Cycle

    Hz measurement mode for frequency measurement or % for duty cycle measurement. The BLUE button cycles among , frequency and duty cycle for UT71C and UT71E. Connect the test leads across with the object being measured. The measured value shows on the primary display.
  • Page 43 Model UT71C/D/E: OPERATING MANUAL Note The requirement of Input amplitude “a” is as follows: When 10Hz~40MHz: 200 mV 30Vrms; > 40MHz: Un-specified When Hz measurement has been completed, disconnect the connection between the testing leads and the circuit under test and remove the test leads...

  • Page 44: Measuring Temperature

    Model UT71C/D/E: OPERATING MANUAL H. Measuring Temperature Warning To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V rms AC. To measure temperature, set up the Meter as shown in Figure 3-8 and proceed the following.

  • Page 45: 4~20Ma Loop Current As % Readout

    Model UT71C/D/E: OPERATING MANUAL Note The rest procedure, please follow B. Measuring Current: DC current measurement (Figure 3-2). Place the Meter in an environment of 18ºC~23ºC When the readings obtained is: otherwise false reading may be obtained especially < 4mA, the primary display shows LO in testing low temperature.

  • Page 46: Power Measurement

    Model UT71C/D/E: OPERATING MANUAL J. Power Measurement Warning To avoid damages to the Meter, please do not attempt to input higher than 250V from outlet altogether reading may be obtained. Take extra care during measurement to avoid electric shock. Switch off the power before the Meter and the object being measured connect to the circuit.
  • Page 47 Model UT71C/D/E: OPERATING MANUAL Note The current of the object being measured must > 10A. 5A continuous measurement is allowed. 5A~10A, only 10 seconds continuous measurement is allowed and the interval between each measurement must be greater than 15 minutes.

  • Page 48: Using Stores, Recall And Send Features

    The maximum number of stored reading is 100 (for start from the first readings or start from the last stored UT71C and UT71E) and 9999 (for UT71D). When reading. Right secondary display shows the original the stored readings memory is full, the Meter will stop number of records.

  • Page 49: Recalling Stored Readings

    Model UT71C/D/E: OPERATING MANUAL Recalling 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. Press RECALL to recall the stored value and RCL appears to confirm the operation.

  • Page 50: Changing The Default Setting

    Model UT71C/D/E: OPERATING MANUAL Chapter 5 Changing the Default Setting Introduction The Meter allows you to change the default operating configuration of the Meter by changing setup options made at the factory. These settings are stored and can be changed in the Setup mode using the procedure described in this chapter.
  • Page 51 Model UT71C/D/E: OPERATING MANUAL Table 5-1. Setup Selections Selection Option Factory Default Description HIGH Max. 40000. Press to select OFF Over the upper limits, beeps not Press to select the digit you want to edit continuously. Max. 40000. Press to select OFF Over the lower limits, beeps not continuously.
  • Page 52 Model UT71C/D/E: OPERATING MANUAL Table 5-1. Setup Selections Selection Option Factory Default Description Analogue Zero is in the left hand side. Zero is in the Zero is in the center center It can only apply to DCV, DCI and °C/°F functions.

  • Page 53: Maintenance

    Model UT71C/D/E: OPERATING MANUAL Chapter 6 Maintenance This chapter 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 54: Replacing The Fuses

    Model UT71C/D/E: OPERATING MANUAL B. 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. Follow Figure 6-1 and proceed as follows to replace the Meter’s fuse:...

  • Page 55: Replacing The Battery

    Model UT71C/D/E: OPERATING MANUAL C. Replacing the Battery 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. Make sure the test leads are disconnected from the circuit being tested before opening the case bottom.

  • Page 56: Specifications

    Model UT71C/D/E: OPERATING MANUAL Chapter 7 Specifications Safety and Compliances Refer to different range input protection voltage Maximum Voltage between any Terminal and Grounding Certification IEC 61010 CAT.III 1000V, CAT.IV 600V overvoltage and Compliances double insulation standard 0.5A, 250V, fast type fuse, 5×20mm...

  • Page 57: Physical Specifications

    Model UT71C/D/E: OPERATING MANUAL Physical Specifications 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. 0ºC~40ºC (32ºF~104ºF) Operating Temperature -10ºC~50ºC (14ºF~122ºF) Storage Temperature 75% @ 0ºC~30ºCæ...

  • Page 58: General Specifications

    Model UT71C/D/E: OPERATING MANUAL General Specifications Auto Range Auto Polarity Display OL Overloading (except at 4~20mA Loop range which display HI or LO) Display Battery Deficiency...

  • Page 59: Feature Summary

    Model UT71C/D/E: OPERATING MANUAL Feature Summary 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 60: 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 61: Detailed Accuracy Specifications

    Model UT71C/D/E: OPERATING MANUAL Detailed Accuracy Specifications Accuracy: ([% of reading] + [number of least significant digits), guarantee for 1 year. Operating temperature: 18ºC~28ºC Relative humidity: 75%RH A. DC Voltage Range Resolution Accuracy Overload Protection Input Impedance (0.025%+5) 400mV 0.01mV Around 2.5G...

  • Page 62: Ac Voltage

    Model UT71C/D/E: OPERATING MANUAL B. AC Voltage (AC+DC measurement is available) Range Resolution Bandwidth Accuracy 0.0001V 45Hz~1kHz (0.4%+30) 1kHz~10kHz (1.5%+30) 10kHz~100kHz (6%+30) 0.001V 45Hz~1kHz (0.4%+30) 1kHz~10kHz (1.5%+30) 10kHz~100kHz (6%+30) 400V 0.01V 45Hz~1kHz (0.4%+30) 1kHz~10kHz (5%+30) 10kHz~100kHz Not Specified 1000V 0.1V...
  • Page 63 Model UT71C/D/E: OPERATING MANUAL Remarks: Input Impedance: Approx 10M . Overload Protection: 1000V. 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 64: Dc Current

    Model UT71C/D/E: OPERATING MANUAL C. DC Current Range Resolution Accuracy Overload Protection 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 (0.5%+30) 10A, 250V, fast type fuse, 5×20mm 0.001A Remarks: At 10A range: When the measured current is 5A, continuous measurement is allowed.

  • Page 65: Ac Current

    Model UT71C/D/E: OPERATING MANUAL D. AC Current (AC+DC measurement is available) Range Resolution Bandwidth Accuracy Overload Protection 45Hz~1kHz 400µA 0.01µA 0.5A, 250V, fast type fuse, (0.7%+15) 1kHz~10kHz 4000µA 0.1µA 5×20mm (1%+40) 40mA 0.001mA 400mA 0.01mA (1.5%+20) 45Hz~1kHz 0.001A 10A, 250V, fast type fuse,...

  • Page 66: E. Resistance

    Model UT71C/D/E: OPERATING MANUAL E. Resistance Range Resolution Accuracy Overload Protection 0.01 (0.3%+8)+test leads open circuit value 0.0001k (0.3%+8) 0.001k 1000V (0.5%+20) 400k 0.01k (1%+40) 0.0001M (1.5%+40) 0.001M F. Continuity Test Range Resolution Overload Protection 0.01 1000V Remarks: Open circuit voltage approximate -1.2V.

  • Page 67: G. Diode Test

    Model UT71C/D/E: OPERATING MANUAL G. Diode Test Range Resolution Overload Protection 0.0001V 1000V Remarks: Open circuit voltage approximate 2.8V. A good silicon junction drops between 0.5V and 0.8V. H. Capacitance Range Resolution Accuracy Overload Protection 40nF 0.001nF (1%+20)+ capacitance value of open circuit test leads 400nF 0.01nF...

  • Page 68: I. Frequency

    Model UT71C/D/E: OPERATING MANUAL I. Frequency Range Resolution Accuracy Overload Protection 40Hz 0.001Hz 400Hz 0.01Hz 4kHz 0.0001kHz 40kHz 0.001kHz (0.01%+8) 1 0 0 0 V 400kHz 0.01kHz 4MHz 0.0001MHz 40MHz 0.001MHz 400MHz 0.01MHz Not Specified Remarks: l Input amplitude “a” as follows; (DC electric level is zero) When 10Hz~40MHz : 200mV 30Vrms;...
  • Page 69 Model UT71C/D/E: OPERATING MANUAL J. Temperature Degrees Celsius Range Resolution Accuracy Overload Protection -40ºC~40ºC (3%+30) 1 0 0 0 V 40ºC~400ºC (1%+30) 0.1ºC 400ºC~1000ºC 2.5% Fahrenheit Range Resolution Accuracy Overload Protection -40ºF~32ºF (4%+50) 0.1ºF 1 0 0 0 V 32ºF~752ºF (1.5%+50)

  • Page 70: L. Power Measurement

    Model UT71C/D/E: OPERATING MANUAL K. 4~20 mA loop current Range Resolution Accuracy Overload Protection ( 4 ~ 2 0 m A ) % 0.01% (1%+50) 0.5A, 250V, fast type fuse, 5×20mm Remarks: When the readings obtained is: < 4mA, the primary display shows LO 4mA, the primary display shows 0% ….
  • Page 71 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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