Uni-Trend UT71A multimeter
Contents
1. 2000 1 0 2 20 0 15 20 0 5A 250 fast type fuse 5 20 20mA 0 001mA 200mA 0 01mA 10A 0 001A 0 8 30 0 7 30 10A 250V fast type fuse 5 20 Remarks At 10A range When the measured current is lt 5A continuous measurement is allowed When the measured current is between 5A 10A continuous measurement 10 seconds and interval more than 15 minutes 61 Model UT71A B OPERATING MANUAL D AC Current AC DC measurement is available Range Resolution Bandwidth Overload Protection 200 0 01uA 45Hz 1kHz 1 15 0 8 15 2000A 1 1kHz 10kHz 2 40 1 5 40 0 5A 250V fast type 20mA 0 001mA fuse h 5x20mm 200mA 0 01mA 10A 0 001A 45Hz 1kHz 2 20 2 20 10A 250V fast type 1kHz 10kHz 6 40 6 40 fuse 6 5x20mm Remarks Display a True rms are valid from 10 of range to 100 of range b AC crest factor can be up to 3 0 c Aresidual reading of 80 digits with test leads shorted will not affect stated accuracy d When frequency is lower than 100kHz the accuracy guarantee range 10 100 When making AC DC measurment the accuray need to add 1964 35 digits of reading based on the above table At 10A range a When the measured current is lt 5A continuous measurement is allowed b When the measured current is between 5A 10A continuous measurement 10 seconds and interval more than 15 minutes2. 55 Feature Summary 56 Basic Specifications 57 Detailed Accuracy Specifications 58 A DC Voltage 58 B AC Voltage 59 C DC Current 61 Model UT71A B OPERATING MANUAL CHAPTER TITLE PAGE D AC Current _ _ _ a 62 E Resistance _ _ _ _ 63 F Continuity Test 63 G Diode Test mE rr a D 22 64 Capacitance 64 Frequency 65 J Temperature 66 Degrees Celsius 66 Fahrenheit _ 66 4 20mA loop current e 67 Model UT71A B OPERATING MANUAL Chapter 1 Before You Start Overview This Operating Manual covers information on safety and cautions Please read the relevant information carefully and observe all the Warnings and Notes strictly A Warning To avoid electric shock or personal injury read the Safety Information and Rules for
3. DC current measurement 20mA 200mA Toggle between AC or DC current AUN DC current measurement 20mA 200mA Toggle between AC or DC current UT71B only 4 20mA loop current as reading AN AC or DC current measurement 10A Toggle between AC or DC current 13 Model UT71A B 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 lt 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 This additional feature appears right above or on the left hand side of the appropriate keys To access the second additional feature of the button e g lt press once the button again while the Meter has already entered the first additional feature e g RECALL The second additional feature appears on the right hand side above the appropriate keys The RANGE and EXIT buttons has only one additional feature 14 Model UT71A B OPERATING MANUAL Table 2 2 Functional Buttons Button Description Access Method SETUP lt UT71A only Range feature Exit AUTO and enter MANUAL ranging In MANUAL select next input range EXIT to return to AUTO AUTO is default Testing resistance signal from calibrator When testing resistance sign
4. Meter Structure 11 Model UT71A B 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 When you turn the rotary switch from one function to another a display for the new function appears Button choices made in one function do not carry over into another function The Table 2 1 described each rotary switch position Table 2 1 Rotary Switch Selections Sue Rotary Switch Function Blue Key Function OFF Turn the Meter off None DC voltage measurement None V AC voltage measurement None mV 25 UT71A only DC millivoltage measurement None Hz mV DC millivoltage measurement Frequency measurement Frequency signal duty cycle measurement 12 Model UT71A B OPERATING MANUAL Table 2 1 Rotary Switch Selections BUE LR Rotary Switch Function Blue Key Function FO Resistance measurement Diode test Continuity test 16 Capacitance measurement None Hz Frequency measurement Frequency signal duty cycle measurement C F UT71B only Centigrade temperature measurement Fahrenheit temperature measurement UA S DC current measurement 200A 2000 Toggle between AC or DC current UT71A only
5. OPERATING MANUAL Button Description Access Method Blue Button CJ Use the blue button to select any rotary switch alternate function labeled in blue letters Press and hold the Button while turning on the Meter to toggle to 2000 counts for all functions It is faster when the Meter is at 4000 counts measurement mode After the Meter is resuming from Automatic Power Off or turn on and off again the Meter will back to normal measurement mode 20000 counts Press the button once 20 Model UT71A B 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 Dev The tested DC voltage value No display Full range 2 20 200 1000 The tested AC voltage value The tested frequency value Full range 2 20 200 750 40 00kHz 250 0kHz DCmV The tested DCmvV value No display Full range 200 The tested resistance value No display Full range 200 2 20 200 2 20 The tested resistance value No display Full range value 200 gt The tested resistance value No display Full range 2 Hz The tested frequency value No display Full range 20 200 2 20 200 2 20 200 tested capacitance value No display Full range 20 200 2 20 200 2 20 UT The tested C value N
6. 62 Model UT71A B OPERATING MANUAL E Resistance Range Resolution UT71A Accuracy UT71B Overload Protection 200 0 5 20 test leads open circuit value 0 012 0 0001kQ 0 5 20 0 001kQ 20MQ 0 001MQ 1 5 40 0 01kQ 1 20 0 0001MQ 1 40 0 4 20 test leads open circuit value 0 4 20 0 8 20 1 40 1 5 40 1000V F Continuity Test Range Resolution en 0 01Q Remarks Open circuit voltage approximate 1 2V Overload Protection 1000V The buzzer does not sound when the test resistance is gt 600 The beeper comes on continuously for open conditions that is test resistance is lt 400 63 Model UT71A B OPERATING MANUAL G Diode Test 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 Overload Protection 64 Accuracy Range Resolution UT7IA UT7iB 20nF 0 001nF 1 5 20 capacitance 1 2 20 capacitance value of open circuit test leads value of open circuit test leads 200nF 0 01nF 2uF 0 0001 pF 1 5 20 1 2 20 20uF 0 001uF 1 5 40 1 2 40 200uF 0 01uF 1 5 40 2mF 0 0001mF 5 40 5 40 20mF 0 001 mF Not specified Not specified 1000V Model UT71A B OPERATING MANU
7. between 5A 10A continuous measurement lt 10 seconds and interval more than 15 minutes When current measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove testing leads away from the input terminals of the Meter 33 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 To measure resistance set up the Meter as shown in Figure 3 3 and follow the following procedure 1 Insert the red test lead into the Q terminal and the black test lead into the COM terminal 2 Set the rotary switch to Q e press BLUE button to select measurement mode 3 Connect the test leads across with the object being measured The measured value shows on the display The BLUE button cycles among resistance continuity and diode 34 Model UT71A B OPERATING MANUAL Black Figure 3 3 Resistance Measurement Model UT71A B OPERATING MANUAL Note When measuring low resistance the test leads can add 0 12 to 0 2Q of error to resistance measurement To test the leads touch the probe tips together and read the resistance of the leads If necessary you can press RELA to automatically
8. return to current measurement mode Press the button once after entering SEND mode Press the button once Press to output the data AUTO mode switch off The primary display shows SEND Press EXIT to exit Press and hold the button for over 1 second In Setup each press to decrement an Option In Recall each press to go back to the previous stored reading In Store each press to decrease a second on the storing interval Press EXIT to exit Press the button once after entering SEND mode 18 Model UT71A B OPERATING MANUAL Table 2 2 Functional Buttons Button Description Access Method Press to enter relative mode the primary display shows A The left secondary display shows the present measurement value The right secondary display shows the stored value The primary display shows the present measurement value minus the stored value Press EXIT to exit relative mode Press the button once In Setup each press to increment an Option In Recall each press to recall the next stored reading In Store each press to increase a second on the storing interval Press and hold the button for over 1 second Yellow Button left secondary display AC DC When it is at AC measurement mode press the button to display AC DC True RMS value in the primary display and Press the button once 19 Table 2 2 Functional Buttons Model UT71A B
9. subtract this value For high resistance measurement gt 1MQ it is normal taking several seconds to obtain a stable reading In order to obtain precision readings use the test lead as short as possible The LCD displays OL indicating open circuit or the tested resistor value is higher than the maximum range of the Meter When testing the resistance signal from the calibrator it is necessary to press and hold the RANGE while turning on the Meter to change the maximum display to 2000 counts but the accuracy remains unchanged When resistance measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove testing leads away from the input terminals D Testing for Continuity A 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 continuity To test for continuity set up the Meter as Figure 3 4 and do the following 1 2 Insert the red test lead into the terminal and the black test lead into the COM terminal Set the rotary switch to Q press BLUE button to select measurement mode and connet the test leads across with the object being tested The beeper comes on continuously for open conditions that is test resistance 500 The BLU
10. test lead on the component s cathode The red test lead polarity is while the black test lead polarity is The measured value shows on the display The BLUE button cycles among resistance continuity and diode Note 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 Connect the test leads to the proper terminals as said above to avoid error display The LCD will display OL indicating either open circuit or wrong polarity connection The unit of diode is volt V displaying the positive connection voltage drop value Open circuit voltage approximate 2 8V 38 Model UT71A B OPERATING MANUAL When diode 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 Model UT71A B OPERATING MANUAL F Measuring Capacitance A 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 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 d
11. the Meter and any accident 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 Meter from corrosion damage and accident The Meter is suitable for indoor use Turn the Meter off when it is not in use and take out the battery when not using for a long time Constantly check the battery as it may leak when it has been using for some time replace the battery as soon as leaking appears A leaking battery will damage the Meter Model UT71A B 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 dl AC or DC Measurement DC Measurement AC Measurement Grounding Double Insulated aE gt m Warning Refer to the Operating Manual Deficiency of Built In Battery Conforms to Standards of European Union Turning the Meter On To turn the Meter on turn the rotary switch from OFF to any switch setting Battery Considerations The Meter uses one 9V Battery NEDA 1604 6F22 006P The following paragraphs describe several techniques used to conserve battery power Automatic Power Off The display blanks and the Meter goes into a sleep mode if you have not changed the rotary switch position or pressed a button for a set period While in Sleep mode pressing the blue button or
12. turning the rotary switch could turn the Meter on The Meter then returns to the display for the function selected with the rotary switch all previously activated button features are discarded 10 Model UT71A B OPERATING MANUAL Chapter 2 Getting Acquainted The automatic power off is preset to 10 minutes From the Setup menu see Chapter 5 you could specify a 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 Automatic Backlight Off Press LIGHT button to turn the backlight on and press LIGHT again to turn it off Press EXIT to exit the feature Press LIGHT to select the backlight level low or high In Setup menu see Chapter 5 you could specify a time to automatically turn off the backlight 10 seconds 20 seconds 30 seconds or OFF If the period is set to OFF the backlight feature is disabled Model UT71A B OPERATING MANUAL Low Battery Indication A constant battery icon Ea in the upper left corner of the display notifies you that the batteries are low and should be replaced A Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery icon 24 appears The Meter Structure The Figure 2 1 shows the Meter structure 1 LCD Display 2 Functional Buttons 3 Rotary Switch 4 Input Terminals Figure 2 1
13. units by press the BLUE button once you have selected the temperature function Insert the point contact temperature probe into the Meter as figure 10 Place the temperature probe to the object being measured The measured value shows on the display after several seconds req Figure 3 8 Temperature Measurement 43 Note Place the Meter in an environment of 18 23 otherwise false reading may be obtained especially in testing low temperature The included point contact temperature probe can only be used with temperature 230 C below When temperature measurement has been completed remove the temperature probe away from the multi purpose socket and remove the multi purpose socket away from the Meter 1 4 20 mA loop current as readout UT71B only It shows the mA measured value or output level in 96 in a 4 20mA scale To use 4 20mA Loop feature connect the Meter as follows 1 Set the rotary switch to 4 and press BLUE button to select 4 20mA feature 44 Model UT71A B OPERATING MANUAL 2 The rest procedure please follow B Measuring Current DC current measurement Figure 3 2 3 When the readings obtained is lt 4mA the primary display shows LO 4mA the primary display shows 0 20mA the primary display shows 100 gt 20mA the primary display shows HI Model UT71A B OPERATING MANUAL Introduction Chapt
14. 8 Model UT71A B 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 Guang Dong Province China Postal Code 523 925 Headquarters Uni Trend Group Limited 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
15. AL 1 Frequency Range Resolution Accuracy Overload Protection 20Hz 0 001Hz 200Hz 0 01Hz 2kHz 0 0001kHz 20kHz 0 001kHz 0 1 15 1000V 200kHz 0 01kHz 2MHz 0 0001MHz 20MHz 0 001 MHz 200MHz 0 01MHz Not Specified Remarks Input amplitude a as follows DC electric level is zero When 10Hz 40MHz 200mV lt a lt 30Vrms When 40MHz Not specified 65 J Temperature UT71B only Degrees Celsius Model UT71A B OPERATING MANUAL Range Resolution Accuracy Overload Protection 40 C 40 C 3 30 40 C 400 C 0 19C 1 30 1000V 400 C 1000 C 2 596 Fahrenheit Range Resolution Accuracy Overload Protection 40 F 32 F 4 50 32 F 752 F 0 1 F 1 5 50 1000V 752 F 1832 F 3 Remarks Included is a K Type nickel chromium nickel silicon point contact temperature probe which could only measure temperature below 230 C If you want to measure temperature higher than 230 C you must use the rod contact temperature probe 66 Model UT71A B OPERATING MANUAL K 4 20 mA loop current UT71B only 4 20mA 0 01 1 50 0 5A 250V fast type fuse 5x20mm Remarks When the readings obtained is lt 4mA the primary display shows LO 4mA the primary display shows 0 20mA the primary display shows 100 gt 20 the primary display shows HI END 67 6
16. E button cycles among resistance continuity and diode 35 Note Open circuit voltage around 1 2V and range is 4000 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 36 Model UT71A B OPERATING MANUAL Figure 3 4 Continuity Test Model UT71A B OPERATING MANUAL E Testing Diodes A 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 Use the diode test to check diodes transistors and other semiconductor devices The diode test sends a current through the semicondutor junction then measure the voltage drop across the junction A good silicon junction drops between 0 5V and 0 8V To test the diode out of a circuit set up the Meter as Figure 3 5 and proceed as follows 1 Insert the red test lead into the terminal and the black test lead into the COM terminal 2 Set the rotary switch to and press BLUE button to select gt measurement mode Figure 3 5 Diode Test 37 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black
17. H A DC Voltage Accuracy Range Resolution Overload Protection Input Impedance UT71A UT71B 200mV 0 01mV 0 05 5 Around 2 560 2V 0 0001V 0 1 8 1000V 20V 0 08 5 Around 10MQ 200V 1000V 0 1V 0 15 8 0 1 8 58 Model UT71A B OPERATING MANUAL B AC Voltage AC DC measurement is available Accuracy UT71A UT71B 2V 0 0001V 45Hz 1kHz 0 8 40 0 6 40 1 6 40 7 40 20V 0 001V 0 6 40 1 8 140 8 40 Approx 10MQ Resolution Bandwidth Input Impedance 200V 0 01V 45Hz 1kHz 0 8 40 0 6 40 1kHz 10kHz 5 40 5 40 10kHz 100kHz Not Specified Not Specified 1000V 0 1V 45Hz 1kHz 1 5 40 1 2 40 1kHz 5kHz 6 40 5kHz 10kHz 10 40 59 Model UT71A B OPERATING MANUAL Remarks 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 C A residual reading of 80 digits with test leads shorted will not affect stated accuracy d When frequency is lower than 100kHz the accuracy guarantee range 10 100 e When making AC DC measurment the accuray need to add 1 35 digits of reading based on the above table 60 Model UT71A B OPERATING MANUAL C DC Current Accuracy Range Resolution Overload Protection UT71A UT71B 200A 0 01
18. LINII T Model UT71A B OPERATING MANUAL Model UT71A B OPERATING MANUAL CHAPTER 1 TABLE OF CONTENTS TITLE PAGE Before You Start 5 Overview Se se 5 Unpacking Inspection 6 Safety Information 7 Rules For Safe Operation 7 International Electrical Symbols 9 Getting Acquainted Slt 10 Turning the Meter On 5 10 Battery Considerations 10 Automatic Power Off Se 10 Automatic Backlight Off 10 Low Battery Indication 11 The Meter Structure 11 Rotary Switch 12 Functional Buttons HEE 14 The Meter Functions Vs Displays Selecting the Range Understanding the Display 24 CHAPTER Model UT71A B OPERATING MANUAL TITLE PAGE 29 Analogue Bar Graph 29 Using MAX MIN Making Measurements 30 Introduction 30 A Measuring Voltag
19. Meaning TrueRMS Indicator for True RMS value 9 AC DC For DCV and DCA functions reading represents the True RMS total of AC and DC measurements 10 MQ Ohm The unit of resistance kQ Kilohm 1x103 or 1000 ohms MQ Megaohm 1x106 or 1 000 000 ohms Hz kHz MHz Hz Hertz The unit of frequency in cycles second kHz Kilohertz 1x109 or 1000 hertz MHz Megahertz 1x106 or 1 000 000 hertz mV V V Volts The unit of voltage mV Millivolt 1x10 3 or 0 001 volts A A Amperes amps The unit of current mA Milliamp 1x10 3 or 0 001 amperes 1 10 6 or 0 000001 amperes Model UT71A B OPERATING MANUAL Table 2 4 Display Features No Symbol Meaning 10 nF uF Farad The unit of capacitance mF nF Nanofarad 1x10 9 or 0 000000001 farads UF Microfarad 1x10 6 or 0 000001 farads mF Millifarad 1x1079 or 0 001 farads 11 Automatic power off feature is on 12 1 Continuity test 13 STO 0 71 Data store is on RCL UT71B Data recall is on 14 A The relative mode is on to display the present value minus the stored value 15 LOW The indicator for the lowest setup limit HIGH The indicator for the highest setup limit 16 AUTO The Meter is in the auto range mode in which the Meter automatically selects the range with the best resolution 17 SEND Data output is in progress 27 Model UT71A B OPERATING MANUAL Tabl
20. Safe Operation carefully before using the Meter Digital Multimeter UT71A B hereafter referred to as the Meter is a 20000 counts and 4 1 2 digits with steady operations fashionable structure and auto ranging instrument They all not only can measure AC voltage and current DC voltage and current Resistance Capacitance Frequency Diodes Continuity Relative Mode but also has AC True RMS AC DC Low Battery Display Double Display Backlight Data Hold Automatic Power Off and full overload protection UT71B has extra Temperature 4 20mA Loop Data Store and Data Recall feature Model UT71A B 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 Qty 1 English Operating Manual 1 piece 2 Test Lead 1 pair 3 K Type nickel chromium nickel silicon Point Contact Temperature Probe It is 1 piece only suitable for measuring temperature under 230 C UT71B only 4 Alligator Clip 1 piece 5 Test Clip 1 pair 6 USB interface cable 1 piece 7 CD ROM Installation Guide amp Computer Interface Software 1 piece 8 Carrying Bag 1 piece 9 9V Battery NEDA 1604 6F22 006P 1 piece In the event you find any missing or damage please contact your dealer immediately 6 Model UT71A B OPERATING MANUAL Safety Information This Mete
21. al Certification CE IEC 61010 CAT III1000V CAT IV 600V overvoltage and Compliances double insulation standard 0 5A 250V fast type fuse 0 5x20mm 10A 250V fast type fuse 65x20mm 53 Physical Specifications Model UT71A B OPERATING MANUAL Display LCD Operating Temperature Storage Temperature Digital 20000 counts on primary display updates 2 3 times second 2000 counts on two secondary displays Analog 40 segments updates 10 times second 0 C 40 C 32 F 104 F 10 C 50 C 14 F 122 F Relative Humidity lt 75 0 C 30 C below lt 50 30 C 40 C Battery Type 9V NEDA 1604 or 6F 22 or 006P Electromagnetic Compatibility Dimensions H x W x L In aradio field of 1 V m below Overall Accuracy Specified Accuracy 5 of Range In a radio field of 1 V m above No assigned accuracy is specified 177 x 85 x 40mm Weight Approx 340g including battery 54 Model UT71A B OPERATING MANUAL General Specifications Range Auto Polarity Auto Overloading Display OL For UT71B only except at 4 20mA Loop range which display HI or LO Battery Deficiency Display EA 55 Feature Summary Model UT71A B OPERATING MANUAL Tri Digital Displays Analogue Bar Graph Primary 20 000 counts Left Secondary 2000 counts Right Secondary 2000 counts Bar Graph 40 segments updates 10 times second Bac
22. al from calibrator it is necessary to press this button to change the maximum display to 4000 counts but the accuracy remains unchanged Press the button once Press and hold the button while turning on the Meter Setup feature Access Setup selections the display shows SET In the Setup mode each press of SETUP button steps to the next Selection Press to output the data AUTO mode switch off The primary display shows SEND Press EXIT to exit Press and hold the button for more than 1 second Press the button once 15 Table 2 2 Functional Buttons Model UT71A B OPERATING MANUAL Button Description Access Method lt SEND UT71A only Setup feature In Setup press to select OFF at the selection of HIGH and LOW Press the button once after entering Setup mode RECALL lt UT71B only Store feature Store the current measurement value Press EXIT to exit the Store feature Recall feature Recall the stored value Press EXIT to exit the Recall feature Press the button once Press and hold the button for over 1 second Setup feature In Setup press to select OFF at the selection of HIGH and LOW Press the button once after entering Setup mode Peak HOLD K Hold feature Press HOLD to freeze the displayed value Press EXIT to release the display Peak Hold feature Press to access Peak Hold feature the primary display show
23. an value response When a ACV function is selected you can press the Yellow Button to view the AC DC True RMS value in the primary display To exit please EXIT button The BLUE button cycles among mV zz frequency and duty cycle Note When measuring voltage the Meter acts around a 10MO Z and or 2 5GO mV zz impedance parallel with the circuit This loading effect can cause measurement errors in high impedance circuits In most cases the error is negligible 0 196 or less if the circuit impedance is 10kQ or less Special care should be taken when measuring high voltage When voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove testing leads away from the input terminals of the Meter 31 Model UT71A B OPERATING MANUAL B Measuring Currents A 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 Use proper terminals function and range for the measurement Never place the testing leads in parallel with any circuit or component when the leads are plugged into the current terminals To measure AC or DC current set up the Meter as Figure 3 2 and proceed as follows 1 Turn off power to the circuit Discharge all high voltage capacitors 2 I
24. e 2 4 Display Features 28 No Symbol Meaning 18 je Backlight feature is on 19 HOLD Data hold mode is active 20 PEAK HOLD Peak hold mode is active 21 Diode test 22 Frequency signal duty cycle 4 20mA loop current as reading 23 gt OL The input value is too large for the selected range 24 Analogue Bar Graph Provides an analog indication of the present input quick response Model UT71A B OPERATING MANUAL Analogue Bar Graph The bar graph provides an analogue indication of the measured input For most measurement functions the bar graph updates 10 times per second Using MAX MIN The MAX MIN mode stores minimum MIN and maximum MAX input values When the input goes below the stored minimum value or above the stored maximum value the Meter beeps and stores the new value Press MAX MIN to enter MAX MIN mode The sampling time is every 2 seconds The maximum reading and MAX are shown on the left secondary display The minimum reading and MIN are shown on the right secondary display The primary display shows the current measurement reading Press MAX MIN the second time the current measurement reading is shown on the left secondary display The minimum reading and MIN are shown on the right secondary display The primary display shows the maximum value Press MAX MIN the third time the current measurement reading is shown on the left secondary display The maximum readi
25. er 4 shows you how to use stores recall and communication features available on the Meter Please note that Data stores and recall features are available only on the UT71B Storing and Clearing Readings To store readings proceed as follows Press STORE once STO and no xxxx appears to confirm the operation and the left secondary display shows the current measurement reading Press gt to toggle between clearing the stored readings and start from the first readings or start from the last stored reading Right secondary display shows the original number of records Press STORE the second time STO appears The left secondary display shows the storing time interval in second it is preset to zero To change the interval Chapter 4 Using Store Recall amp Send Features in second by pressing or button The interval can be as high as 255 seconds or as low as 0 second Press and hold STORE to access the quick setting Press STORE the third time STO and no appears The left secondary display shows the index number increase one The right secondary display shows the value of the corresponding index number the primary display shows the current measurement reading If there is not set time to store the reading each press of STORE to store one reading An index number increase one The maximum number of stored reading is 100 for UT71C and UT71E and 9999 for UT71D When the stored readings memory is full the Meter will s
26. es 30 32 B Measuring Currents C Measuring Resistance 34 35 D Testing for Continuity E Testing Diodes 37 F Measuring Capacitance G Measuring Frequency Duty Cycle 39 41 H Measuring Temperature p 43 44 4 20mA loop current as readout Using Stores Recall and Send Features 45 Introduction 45 Storing and Clearing 45 Recalling Stored Readings 46 Using Send 46 Model UT71A B OPERATING MANUAL CHAPTER TITLE PAGE 5 Changing the Default Setting 47 Introduction 47 Selecting Setup Options 47 6 Maintenance 50 A General Service S e 50 B Replacing the Fuses 51 C Replacing the Battery 52 7 Specifications 53 Safety and Compliances 53 Physical Specifications 54 General Specifications
27. identical type and specification as follows and make sure the fuse is fixed firmly in the bracket Fuse 1 0 5A 250V fast type fuse 5 20 Fuse 2 10 250V fast type fuse 5 20 Rejoin the case bottom and case top and install the 5 screws Replacement of the fuses is seldom required Burning of a fuse always results from improper operation Figure 6 1 Fuse Replacement 51 C Replacing the Battery A Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator Ea appears Make sure the test leads are disconnected from the circuit being tested before opening the case bottom Follow Figure 6 2 and proceed as follows to replace the battery Turn the rotary switch to OFF and remove all connections from the terminals Remove the screw from the battery compartment and separate the battery compartment from the case bottom Replace with a new 6F22 9V battery Rejoin the case bottom and battery compartment and reinstall the screw 52 Model UT71A B OPERATING MANUAL Figure 6 2 Battery Replacement Battery Model UT71A B OPERATING MANUAL Safety and Compliances Chapter 7 Specifications Maximum Voltage between any Terminal and Grounding Refer to different range input protection voltage A Fused Protection for AmA input terminal A Fused Protection for A input termin
28. ischarged To measure capacitance set up the Meter as shown in Figure 3 6 and proceed as follows 1 Insert the red test lead into the 4 terminal and the black test lead into the COM terminal Figure 3 6 Capacitance Measurement 39 2 Set the rotary switch to measurement mode the Meter may display a fixed reading which is a internal distributed capacitor value For testing less than 10nF capacitor the tested value must subtract the internal distributed capacitor value to maintain the accuracy To improve the measurement accuracy of small value capacitors less than 10nF press RELA with the test leads open to subtract the residual capacitance of the Meter and leads 3 It is recommended to use test clip to carry out measurement to reduce the effect of internal distributed capacitor Note The LCD displays OL indicating the tested capacitor is shorted or it exceeds the maximum range Capacitors larger than 4001 take longer time The analogue bar graph shows the time left before finishing the measurement 40 Model UT71A B OPERATING MANUAL When capacitance measurement 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 of the Meter Model UT71A B OPERATING MANUAL G Measuring Frequency Duty Cycle A Warning To avoid harms to you please do not attempt to input voltage higher than 30V r
29. klight with 2 brightness levels Bright backlight for clear readings in poorly lighted areas Autorange The Meter automatically selects best range AC DC True RMS AC RMS Choices for AC only or AC DC readings Data Hold Holds readings on display Continuity Bar Graph Duty Cycle MAX MIN Mode Beeper sounds for resistance readings below threshold 40 segments Measure signal on or off time in Record maximum and minimum Battery Access Door Battery replaceable 56 Model UT71A B OPERATING MANUAL Basic Specifications Function Ranges Description DC Voltage 0 to 1000V AC Voltage True RMS 0 to 1000V 100kHz bandwidth Basic Accuracy DC Voltage 0 025 AC Voltage 0 4 0 to 10A 5 10A for lt 10 seconds interval 215 minutes DC Current AC Current True RMS 0 to 10A 5 10A for 10 seconds interval 2 15 minutes Resistance 0 to 40MO Capacitance 0 to 40mF Frequency 0 400MHz Temperature 40 C 1000 C 40 F 1832 F STORE Readings Up to 100 readings for UT71C and UT71E or 9999 readings for UT71D may be saved by the user ina memory These readings may be viewed by using Recall feature 57 Model UT71A B OPERATING MANUAL Detailed Accuracy Specifications Accuracy of reading number of least significant digits guarantee for 1 year Operating temperature 18 C 28 C Relative humidity lt 75 R
30. lly 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 If AUTO is already on press RANGE to enter MANUAL ranging in the present range You can then select the next manual range each time you press RANGE Return to autoranging by press EXIT Note that there is no MANUAL ranging on REL feature Understanding the Display Display features are shown in Figure 2 2 and described in Table 2 4 24 Model UT71A B OPERATING MANUAL 778 88 88 88 85 AC DC True RMS MkQHz mV BBBBB ALONAUTOSEND x Peak HOLDHI cH p 25 OLA HL UH Dinn Ot 0 o Q o 2 32 o 4 Figure 2 2 Display Features Model UT71A B OPERATING MANUAL Table 2 4 Display Features No Symbol Meaning 1 MAX Maximum reading displayed MIN Minimum reading displayed AVG Average reading displayed No The sequence of the reading C F UT71B Degrees Celsius default or Fahrenheit HumS H Hour u Micro m Minutes Milli S Second Indicates negative reading Ea The battery is low Z 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 7 SET Setup feature is on 25 Model UT71A B OPERATING MANUAL Table 2 4 Display Features 26 No Symbol
31. ms To measure frequency and duty cycle connect the Meter as Figure 3 7 and do the following 1 2 Insert the red test lead into the Hz terminal and the black test lead into the COM terminal Set the rotary switch to 42 UT71A UT71B and press BLUE button to select the Hz measurement mode for frequency measurement or for duty cycle measurement The BLUE button cycles among mV frequency and duty cycle Connect the test leads across with the object being measured The measured value shows on the primary display Black Figure 3 7 Frequency Duty Cycle Measurement 41 Note The requirement of Input amplitude a is as follows When 10Hz 40MHz 200 mV lt S a lt 30Vrms gt 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 away from the input terminals 42 Model UT71A B OPERATING MANUAL Model UT71A B OPERATING MANUAL H Measuring Temperature UT71B only A 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 1 Set the rotary switch to C F the display shows OL Short circuit the test leads to show the room temperature The Meter is default to Celsius C degree unit you can change
32. ng and MAX are shown on the right secondary display The primary display shows the minimum value Each subsequent press of MAX MIN steps through the above three modes To exit MAX MIN mode press EXIT Press HOLD to stop the Meter updating reading MAX MIN mode can only be used under MANUAL ranging mode 29 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 A Measuring Voltages A Warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000V although readings may be obtained 30 Model UT71A B OPERATING MANUAL Figure 3 1 Voltages Measurement Model UT71A B OPERATING MANUAL To measure voltages set up the Meter as Figure 3 1 and do the following 1 2 3 4 Insert the red test lead into the V terminal and the black test lead into the COM terminal UT71A Set the rotary switch to y or Y or mV zz UT71B Set the rotary switch to For Yor ie Connect the test leads across with the object being measured The measured value shows on the display AC measurement displays the True RMS value DC measurement displays the effective value of sine wave me
33. nsert the red test lead into the mApA or A terminal and black test lead into the COM terminal 3 If you are using the A terminal set the rotary switch to you are using mApA terminal set the rotary switch to HAS for currents below 20000 or Figure 3 2 Currents Measurement mA S UT71A ormas 7 UT71B for current above 20000 32 Model UT71A B OPERATING MANUAL 4 DC measurement is default press blue button to select AC measurement 5 Open the circuit path to be tested Touch the red testing leads to the more positive side of the break touch the black probe to the more negative side of the bread Reversing the leads will produce a negative reading but will not damage the Meter 6 Turn on power to the circuit then read the display AC measurement displays the True RMS value DC measurement displays the effective value of sine wave mean value response 7 Turn off power to the circuit and discharge all high voltage capacitors Remove the Meter and restore the circuit to normal operation When a ACA function is selected you can press the Yellow Button to view the AC DC True RMS value in the primary display To exit please EXIT button Note If the value to be measured is unknown use the maximum measurement position and reduce the range step by step until a satisfactory reading is obtained When the measured current is lt 5A continuous measurement is allowed When the measured current is
34. o display 1000 The tested DCA value N A Full range 200 2000 21 Table 2 3 Functions Vs Displays Model UT71A B OPERATING MANUAL 40 00kHz 100 0kHz Function Primary Display Right Secondary Display Left Secondary Display ACpA The tested ACuA value The tested frequency value Full range 200 2000 40 00kHz 100 0kHz DCmA The tested DCmA value No display Full range 20 200 The tested ACmA value The tested frequency value Full range 200 2000 reading index number DCA The tested DC current value No display Full range 10 ACA The tested AC current value The tested frequency value Full range 10 40 00kHz 100 0kHz STO The current measurement The value of the corresponding Index number increase one UT71B only Index number 0001 0100 22 Model UT71A B OPERATING MANUAL Table 2 3 Functions Vs Displays Function Primary Display Right Secondary Display Left Secondary Display RCL The recalled value The total number of stored value Index number UT71B onl 0001 0100 MAX MIN Chapter 2 Getting Acquainted Using MAX MIN RELA The present measurement value The stored value minus the stored value The present measurement value 23 Selecting the Range Press RANGE to select either a fixed range or the autorange feature Autoranging AUTO lighted in the display always comes on initia
35. ond It is recommended to change the default setting only when the Meter is at DCV measurement mode In the Setup mode each press of SETUP button steps to the next Selection Each press of or button decrement or increment an Option Each Setup Selection and Option appears in the primary display in the sequence shown in Table 5 1 47 Model UT71A B OPERATING MANUAL Table 5 1 Setup Selections Selection Option Factory Default Description HIGH Max 40000 Press 4 to select OFF OFF Over the upper limits beeps not continuously Press Pto select the digit you want to edit LOW 40000 Press 4 to select OFF OFF Over the lower limits beeps not continuously Press select the digit you want to edit 10 10 mins 10 mins power off 20 20 mins power off 30 30 mins power off OFF Power off feature is disabled a 51 OFF X J10 10 Backlight turn off in 10 seconds 20 Backlight turn off in 20 seconds 30 Backlight turn off in 30 seconds OFF Disable backlight feature 48 Model UT71A B OPERATING MANUAL Table 5 1 Setup Selections Selection Option Factory Default Description Analogue Zero is in the left hand side Zero is in the t LL Bar Zero S inthe sentar center IIIS Graph It can only apply to DCV DCI and C F functions Saving Setup Options At each setup Option store your choice and exit setup by press EXIT advance to the ne
36. r complies with the standards IEC61010 safety measurement requirement in pollution degree 2 overvoltage category CAT III 1000V CAT IV 600V and double insulation CAT Ill Distribution level fixed installation with smaller transient overvoltage than CAT IV CAT IV Primary supply level overhead lines cable Systems etc 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 may 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 to International electrical symbols used on the Meter and in this Operating Manual are explained on page 9 Rules For Safe Operation A 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 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 Look for cracks or missing plastic Pay attention to the insulation around the connectors Inspect the test leads for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads with identical model number or electrical specifications before using the Meter Do not apply more than the rated voltage as ma
37. rked on the Meter between the terminals or between any terminal and grounding 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 When the Meter working at an effective voltage over 60V in DC or 30V rms in AC special care should be taken for there is danger of electric shock Use the proper terminals function and range for your measurements If the value to be measured is unknown use the maximum measurement position Do not use or store the Meter in an environment of high temperature humidity explosive inflammable and strong magnetic field The performance of the Meter may deteriorate after dampened When using the test leads keep your fingers behind the finger guards Disconnect circuit power and discharge all high voltage capacitors before testing resistance continuity diodes Before measuring current check the Meter s fuses and turn off power to the circuit before connecting the Meter to the circuit Replace the battery as soon as the battery indicator appears With a low battery the Meter might produce false readings that can lead to electric shock and personal injury Model UT71A B OPERATING MANUAL When servicing the Meter use only the same model number or identical electrical specifications replacement parts The internal circuit of the Meter shall not be altered at will to avoid damage of
38. s PEAK HOLD Press EXIT to exit Press the button once Press and hold the button for over 1 second 16 Model UT71A B OPERATING MANUAL Table 2 2 Functional Buttons Button Description Access Method Peak HOLD K LIGHT In Setup each press to select the digit you want to edit Press the button once after entering In Recall press to enable SEND feature UT71B only Setup or Recall or Store mode In Store press to toggle between clearing all the stored reading or start storing reading from the current index number UT71B only Press to exit certain button functions and the Meter will return Press the button once to the factory default setting Press to turn the backlight on It is possible to toggle between Press and hold the button for over 1 1St and the 2 backlight level and Exit the feature by pressing second this button After exiting the light feature it is necessary to press and hold the button for over 1 second to turn the backlight on again 17 Table 2 2 Functional Buttons Model UT71A B OPERATING MANUAL Button Description Access Method Press to display max min and average values Press the button once MAXMIN Press EXIT to stop and return to current measurement mode UT71A only SEND MAXMIN UT71B only In Setup each press to decrement an Option Press to display max min and average values Press EXIT to stop and
39. top storing data To exit press EXIT Automatic power off feature will be disabled after entering this mode 45 Model UT71A B OPERATING MANUAL Recalling Stored Readings Using Send ine 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 The left secondary display shows the index number NO XXXX The primary display shows the corresponding recalled data The right secondary display shows the total number of the stored data Press P button to enable the SEND feature to export the data to the computer via USB The software shows the data storing time and also the data value After the data transferring is completed the SEND feature will be disabled automatically Press or button to view additional stored reading Press and hold RECALL to access quick recalling Press EXIT to exit recalling 46 Model UT71A B 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 Selecting Setup Options To enter the Setup mode turn the Meter on and press and hold SETUP button for over 1 sec
40. xt Option by press To exit the Setup mode without saving the present Option press Setup 49 Model UT71A B OPERATING MANUAL Chapter 6 Maintenance This chapter provides basic maintenance information including battery and fuse replacement instruction A 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 A General Service Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings Turn the Meter to OFF when it is not in use Take out the battery when it is not using for a long time Do not use or store the Meter in a place of humidity high temperature explosive inflammable and strong magnetic field 50 Model UT71A B OPERATING MANUAL B Replacing the Fuses A 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 Turn the rotary switch to OFF and remove all connections from the terminals Remove the 5 screws from the case bottom Remove the fuse by gently prying one end loose then take out the fuse from its bracket Install ONLY replacement fuses with the
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