Uni-Trend UT70C multimeter
Contents
1. Page Accuracy Specifications 37 A Voltage AS ae 37 B DC Voltage ae se 37 C Continuity Resistance amp Conductance Test _ _ Lo zi 38 D Capacitance Em eu as 38 E Diodes Test 2 25 e 38 F DC Current zx zs us oe 39 G AC Current E 22 39 H Frequency amp Duty Cycle _ 40 Maintenance ___ a T Lita d 41 A General Service Ze 2 ae 41 B Testing the Fuses 42 C Replacing the Battery m E 43 D Replacing the Fuses Se um 44 RS232C Serial Port _ E ES 45 A RS232C Port Cable 5 45 B Setting of RS232C Serial Ports 45 C System Requirements for Installing the UT70C Interface Program _____________46 Model UT70C OPERATING MANUAL Overview This Operating Manual covers information on safety and cautions Please read the relevant information carefully and observe all the Warnings and Notes strictly ZN warning To avoid electric shock or personal injury read the Safety Information and Rules for Safe Operation carefully before using the Meter Your multimeter is an intelligent digital one a precise instrument with a resolution of 8 000 counts and up to date automatic computer calibrating function High resolution A D converter and micro controller data processing technique is adopted in the Meter featured with intelligence high precision and mult2. Button Measuring Operation Performed Function Continuity Turn the continuity buzzer on and Test off in resistance measurement mode At OFF Press 4 while turning on the position Meter to disable the beeper at all functions except short circuit and diode testing At REC To toggle between 100ms mode or response time and 1ms response REC mode time under REC mode except at plus Hold resistance capacitance and mode continuity range MAX rotary Starts recording of maximum and MIN switch minimum values Steps the position display through the sequence of except at present high MAX low MIN conductance and average AVG readings at mode any mode In 1ms response time it steps through only MAX and MIN reading At OFF To select 1 second high accuracy position response time press and hold down MAX MIN while turning the rotary switch to any function setting RANGE Any rotary 1 Press RANGE to enter the switch manual ranging mode the position Meter beeps Press RANGE to step through the ranges available for the selected function the Meter beeps 3 Press and hold RANGE for over 1 second to return to autoranging the Meter beeps 10 Model UT70C OPERATING MANUAL Functional Buttons 2 HOLD Any rotary switch mode 4es Press HOLD to enter and exit the Hold mode in any mode the Meter beeps Press HOLD to toggle between conductance and resistance value Presen
3. Model UT70C OPERATING MANUAL Table of Contents Title Page Overview Unpacking Inspection my m 4 Safety Information _ xis d 5 Rules For Safe Operation 6 8 8 International Electrical Symbols 23 The Meter Structure mc MS E Rotary Switch EM S RM 20 9 Functional Buttons E ze on ie 10 Display Symbols 12 Measurement Ranges gt ed 14 A Selecting a Measurement Range 14 B Manual Ranging and Autoranging 14 Measurement Operation cs zo E 16 A AC Voltage Measurement 16 B DC Voltage Measurement ___ ___ 17 C DC Milivolt Measurement ____ _ 18 D Measuring Continuity Resistance Conductance amp Capacitance_ _________19 E Testing Diodes a E 23 F DC or AC Current Measurement 24 G Frequency amp Duty Cycle Measurement 26 MAX MIN Recording Mode _ E E 28 PEAK MAX MIN Mode zc 30 Operation of Hold Mode _ _ Se Te La 31 Operation of Auto Hold Mode E 32 The Use of Relative Value and Relative Percentage Value Mode E 33 Turning on the Display Backlight 34 Analogue Bar Graph Display A En 34 Full Icons Display 35 Sleep Mode 2 i 35 General Specifications pe 25 E EO 36 Model UT70C OPERATING MANUAL
4. 1 Insert the red test lead into the 4 VOHz terminal and the black test lead into the COM terminal 2 Set the rotary switch to gt 3 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode The measured value shows on the display 23 Model UT70C OPERATING MANUAL Measurement Operation 9 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 open circuit for wrong connection The unit of diode is Volt V displaying the positive connection voltage drop value When diode testing has been completed disconnect the connection between the testing leads and the circuit under test DC or AC Current Measurement see figure 11 ZA warning Never attempt an in circuit current measurement where the open circuit voltage between the circuit and ground is greater than 250V If the fuse burns out during measurement the Meter may be damaged or the operator himself may be hurt Use proper terminals function and range for the measurement When the testing leads are connected to the current terminals do not parallel
5. Use the proper terminals function and range for your measurements 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 Model UT70C OPERATING MANUAL Rules For Safe Operation 2 Disconnect circuit power and discharge all high voltage capacitors before testing resistance conductance continuity diodes current or capacitance 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 EX appears With a low battery the Meter might produce false readings that can lead to electric shock and personal injury Remove test leads RS232C interface cable and test clip from the Meter and turn the Meter power off before opening the Meter case 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 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 indoo
6. them across any circuit 24 Model UT70C OPERATING MANUAL Measurement Operation 10 The current measurement has 2 measurement positions on the rotary switch AS and MAT The A has a 8 000A and 10 00A range with auto ranging the mA has a 80 00mA and 800 0mA range with auto ranging To measure current do the following 1 2 3 Turn off power to the circuit Discharge all high voltage capacitors Insert the red test lead into the A or mA or terminal and the black test lead into the COM terminal Set the rotary switch to AS or MAT Use the A terminal and AX measurement position if the current value to be tested is an unknown The Meter defaults to DC current measurement mode To toggle between DC and AC current measurement function press 14675 AC current is displayed as an mean value calibrated against sine wave effective value Break the current path to be tested Connect the red test lead to the more positive side of the break and the black test lead to the more negative side of the break Turn on power to the circuit The measured value shows on the display Note For safety sake the measuring time for high current that is 8 000A and 10 00A range should be lt 10 seconds for each measurement and the interval time between 2 measurements should be greater than 15 minutes When current measurement has been completed disconnect the connection between the testing leads and the circuit unde
7. and specification as follows and make sure the fuse is fixed firmly in the bracket Fuse 1 1A 250V fast type glass fuse 5x20mm Fuse2 10A 250V fast type glass fuse 5x20mm Rejoin the PCB and the case top and reinstall the 4 screws Rejoin the case bottom and case top and reinstall the 3 screws and 3 rubber feet Replacement of the fuses is seldom required Burning of a fuse always results from improper operation 44 Model UT70C OPERATING MANUAL RS232C Serial Port 1 A RS232C Port Cable Th Computer Remark B Setting of RS232C Serial Ports Default of RS232C serial port for communication is set as Baud Rate 9600 Start bit 1 always 0 Stop bit 1 always 1 Data bits 8 Parity Odd None 45 Model UT70C OPERATING MANUAL RS232C Serial Port 2 C System Requirements for Installing the UT70C Interface Program To use UT70C Interface Program you need the following hardware and software An IBM PC or equivalent computer with 80586 or higher processor and 640 x 480 pixel or better monitor Microsoft Windows 95 or above At least 16 MB of RAM At least 8MB free space in hard drive Can access to a local or a network CD ROM A free serial port A mouse or other pointing device supported by Windows Please refer to the included CD ROM Installation Guide amp Computer Interface Software for installing and operating instructions of the UT70C Interface Pro
8. graph display no display for positive 0L The input value is too large for the selected range RS232C Computer and the Meter is connected properly Data output is in progress Sao 13 Model UT70C OPERATING MANUAL Measurement Ranges 1 A measurement range determines the highest value the Meter can measure Most Meter functions have more than one range See Accuracy Specifications A Selecting a Measurement Range Being in the right measurement range is important Ifthe range is too low for the input the Meter displays OL to indicate an overload If the range is too high the Meter will not display the most accurate measurement B Manual Ranging and Autoranging The Meter has both manual range and autorange options In the autorange mode the Meter selects the best range for the input detected This allows you to switch test points without having to reset the range In the manual range mode you select the range This allows you to override autorange and lock the Meter in a specific range The Meter defaults to the autorange mode in measurement functions that have more than one range When the Meter is in the autorange mode is displayed To enter and exit the manual range mode 14 Model UT70C OPERATING MANUAL Measurement Ranges 2 1 Press RANGE The Meter enters the manual range mode and Auto turns off Each presses of RANGE increments the range When the hi
9. x 90 x 39 mm Approximate 550g battery included CE Version IEC61010 CAT III 1000V CAT IV 600V overvoltage and double insulation standard UL Version UL 61010B 1 CAT II 1000V overvoltage double insulation standard CE UL This meter is suitable for indoor use 36 Model UT70C OPERATING MANUAL Accuracy Specifications 1 Accuracy a reading b digits guarantee for 1 year Operating temperature 23 C 5 C Relative humidity 8096 Temperature coefficient 0 1 x specified accuracy 1 C A AC Voltage Accuracy 50Hz 60Hz Range Resolution 800mV 100HV L 8V im Overload Protection AC DC 1000V rms Remarks Input impedance 10M O Displays effective value of sine wave mean value response Frequency response 40Hz 400Hz B DC Voltage 0 1 3 AC DC 1000V rms 0 196 1 Remarks At80mV 800mV Range Input impedance 24000MO At8V 1000V Range Input impedance 210MQ 37 Model UT70C OPERATING MANUAL Accuracy Specifications 2 C Continuity Resistance amp Conductance Test Range Resolution Accuracy E ed ontinuity Test Approximate 800 00 100 2 8000 0 5 3 8kQ 80kQ 0 5 1 800kQ 500V rms 8MO Sond 80MO 2 3 onductance Test 09 80nS 0 01nS 2 10 Continuity Test 800 0 Buzzer beeps continuous
10. A shorter response time captures shorter events but with decreased accuracy If you want 1 second response time that can be selected after power on the Meter To use the MAX MIN mode as follows 28 Model UT70C OPERATING MANUAL MAX MIN Recording Mode 2 MAX MIN i Function Action Toenterthe 1 Make sure that the Meter is in the MAX MIN desired measurement function and mode range 2 Press MAX MIN to enter MAX MIN recording mode The present reading is displayed and the Meter is locked in the present range and RECJis displayed 3 Each time a new low or high value is recorded the Meter beeps and displays a new reading In MAX MIN mode Sleep Mode function will be disabled To view the Press MAX MIN to step through on the MAX MIN sequence of present readings high AVG or present low MIN and average AVG reading readings Tostop and Press HOLD to stop recording the resume recorded values will not erase recording Press HOLD again to resume without erasing stored values recording To select response time The pre set response time is 100ms Press to select 1 ms response time in REC mode It is called under PEAK MAX MIN mode In 1 ms response time it steps through on the sequence of MAX and MIN readings only With the rotary switch in the OFF position press and hold down MAX IN while turning on the rotary switch to select 1 second high accuracy
11. HF 10 00HF and 100 0HF To measure capacitance connect the Meter as follows 1 Insert the red test lead or the red test clip into the AEVOHZ terminal and the black test lead or black test clip into the COM terminal 2 Set the rotary switch to HE and press 4400 to select nF measurement mode 3 Connect the test leads or the test clips across with the object being measured The measured value shows on the display Note For testing the capacitor with polarity connect the red test clip or red test lead to anode amp black test clip or black test lead to cathode instead It takes a longer time when testing a high capacitor value the testing time is around 15 seconds in 100HF range When capacitance measurement has been completed disconnect the connection between the testing leads and the circuit under test 22 Model UT70C OPERATING MANUAL Measurement Operation 8 E Testing Diodes see figure 10 A warning To avoid possible damage to the Meter and to the device under test disconnect circuit power and discharge all 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 semiconductor junction then measures the voltage drop across the junction A good silicon junction drops between 0 5V and 0 8V To test a diode out of a circuit connect the Meter as follows
12. Hold and MAX MIN mode The definition is as follows Relative value A present value stored value For instance if the stored value is 20 0V and the present value is 22 0V the reading would be 2 0V If a new measurement value is equal to the stored value then display 0 0V Relative percentage value Avo relative value A stored value X 100 To enter or exit Aand A mode Use rotary switch to select the desired measurement function before selecting RELA If measurement functions change manually after RELAis selected the Meter exits the REL mode Press REL Ato enter A mode and the present measurement range is locked and display the last measurement value as 0 as the stored value Then if carrying out measurement at this time the LCD will display theAvalue as the result Press REL A again to enter A mode and the present measurement range is locked and display the last measurement value as 0 as the stored value Then if carrying out measurement at this time the LCD will display theA value as the result Press REL Aagain or turn the rotary switch to reset the stored value and exitA andA mode returning to normal measurement mode 33 Model UT70C OPERATING MANUAL Turning on the Display Backlight LN warning In order to avoid the hazard arising from mistaken readings in insufficient light or poor vision please use the Display Backlight function Press to turn on the Display Backlight a
13. NGE or turn the rotary Switch to exit Hold mode the Meter beeps In Hold mode DATA HOLD is displayed on the LCD In conductance measurement mode press HOLD to toggle between resistance and conductance value Present resistance value is kept The Meter displays OL when the selected range is overloaded The Meter beeps when a positive result is obtained from continuity test whether it is under the Hold mode or not If you are in MAX MIN recording mode or Amode when HOLD is selected Hold interrupts the function The display does not update but recorded readings are not erased Press HOLD again to resume recording 31 Model UT70C OPERATING MANUAL Operation of Auto Hold Mode Auto Hold means you no need to press HOLD the readings on the LCD will be hold automatically Conditions to enter Auto Hold Mode When input signal is larger than AC DC 100mV Auto Hold mode will be enabled automatically When the change of signal three times continuously within 3 digits it will hold the last value the Meter beeps Considers every value as the base value When the Meter detects an input which is above the base value 300 digits the Meter beeps and holds and displays the value as the new base value 32 Model UT70C OPERATING MANUAL The Use of Relative Value and Relative Percentage Value Mode The AandA mode applies to all measurement functions with auto ranging REL mode can be used together with Auto
14. econds later Sleep Mode To preserve battery life the Meter automatically turns off if you do not turn the rotary switch or press any button for about 30 minutes The buzzer beeps three times 5 minutes before turning off The Meter can be activated by turning the rotary Switch or pressing any button If the Meter is activated by turning the rotary switch it will start from the switch selected function To disable the Sleep Mode press 4679 while turning on the Meter In MAX MIN mode the Sleep Mode is disabled 35 Model UT70C OPERATING MANUAL General Specifications Maximum Voltage between any Terminals and Grounding Fused Protection for mA Input Terminal A Fused Protection for A Input Terminal Maximum Display Temperature Relative Humidity Altitude Battery Type Battery Deficiency Data Holding Negative reading Overloading Dimensions HxWxL Weight Safety Compliances Certification 1000V rms 1A 250V fast type glass fuse 65x20mm 10A 250V fast type glass fuse 65x20mm 8000 updates 5 times second Operating 5 C 40 C 41 F 104 F Storage 10 C 50 C 14 F 122 F lt 80 5 C 31 C lt 50 31 C 40 C Operating 2000 m Storage 10000 m One piece of 9V NEDA1604 or 6F22 or 006P Display Ed Display DATA HOLD Display Display OL Equipped with full icons display Auto and manual range selectable 195
15. error is negligible 0 196 or less When AC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test 16 Model UT70C OPERATING MANUAL Measurement Operation 2 B DC Voltage Measurement see figure 4 Y red black 9090 figure 4 L waring To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000V 750V rms although readings may be obtained The DC Voltage ranges are 8 000V 80 00V 800 0V and 1000V To measure DC Voltage connect the Meter as follows 1 Insert the red test lead into the 4 VO Hz terminal and the black test lead into the COM terminal 2 Setthe rotary switch to V see 3 Connect the test leads across with the object being measured The measured value shows on the display Note In each range the Meter has an input impedance of 10M Q This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kQ the error is negligible 0 196 or less When DC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test 17 Model UT70C OPERATING MANUAL Measurement Operation 3 C DC Millivolt Measurement see figure 5 red black figure 5 ZA warning To avoid harms to you or damages
16. ghest range is reached the Meter wraps to the lowest range 2 To exit the manual range mode press and hold RANGE for over one second The Meter returns to the autorange mode and is displayed Note In Hold and MAX MIN mode press RANGE exits these measurement modes and enters manual range mode In Hz measurement mode press RANGE to attenuate 10 times of input signal amplitude which can increase the Meter sensitivity and stabilize the correct reading 15 Model UT70C OPERATING MANUAL Measurement Operation 1 A AC Voltage Measurement see figure 3 M amp red black figure 3 ZA warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000V 750V rms although readings may be obtained The AC Voltage ranges are 800 0mV 8 000V 80 00V 800 0V and 1000V To measure AC Voltage connect the Meter as follows 1 Insert the red test lead into the 4 V Q Hz terminal and the black test lead into the COM terminal 2 Setthe rotary switch to V v 3 Connect the test leads across with the object being measured The measured value shows on the display which is effective value of sine wave mean value response Note In each range the Meter has an input impedance of 10MQ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kO the
17. gram END This operating manual is subject to change without notice 46 Model UT70C OPERATING MANUAL 47 Model UT70C OPERATING MANUAL GCopyright 2001 Uni Trend International Limited All rights reserved Manufacturer UNI TREND TECHNOLOGY DONG GUAN LIMITED Address Dong Fang Da Dao Bei Shan Dong Fang Industrial Development District Hu Men Town Dong Guan City Guang Dong Province China Headquarters Uni Trend International Limited Address Rm901 9 F Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon Hong Kong Tel 852 2950 9168 Fax 852 2950 9303 Email infoQuni trend com http www uni trend com 48
18. i functions The Meter can be widely used in laboratory field service domestic and other applications All the functions and ranges have overloaded protection Model UT70C OPERATING MANUAL Unpacking Inspection Open the package case and take out the Meter Check the following items carefully to see any missing or damaged part Item Description Qty 1 Operating Manual T piece 2 Test Lead T pair 3 est Clip 1 pair 4 9V Battery 1604 6F22 or 006 1 piece installed 5 RS232C Interface Cable 1 piece 6 CD ROM Installation Guide amp Computer 1 piece Interface Software 7 Holster 1 piece 8 Tilt Stand 1 piece In the event you find any missing or damage please contact your dealer immediately Model UT70C OPERATING MANUAL Safety Information CE Version The Meter complies with the standards IEC61010 1 in pollution degree 2 overvoltage category CAT III 1000V CAT IV 600V and double insulation UL Version The Meter complies with the standards UL61010B 1 in pollution degree 2 overvoltage category CAT II 1000V and double insulation CAT II Local level appliance PORTABLE EQUIPMENT etc with smaller transient voltage overvoltages than CAT III CAT III Distribution level fixed installation with smaller transient overvoltages than CAT IV CAT IV Primary supply level overhead lines cablesystems etc Use the Meter only as specified in this operating man
19. ing the Battery see figure 15 Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator 2 appears To replace the battery 1 on as Turn the Meter to OFF position and remove all connections from the terminals Take out the Meter from the holster Remove the 3 rubber feet and then 3 screws from the case bottom and separate the case top from the case bottom Remove the battery from the battery connector Replace the battery with a new 9V battery NEDA1604 6F22 or 006P Rejoin the case bottom and case top and reinstall the 3 screws and 3 rubber feet 43 Model UT70C OPERATING MANUAL Maintenance 4 D Replacing the Fuses see figure 15 Warning To avoid electrical shock or arc blast or personal injury or damage to the Meter use specified fuses ONLY in accordance with the following procedure To replace the Meter s fuse 1 2 3 Turn the Meter to OFF position and remove all connections from the terminals Take out the Meter from the holster Remove the 3 rubber feet and 3 screws from the case bottom and separate the case top from the case bottom Remove the 4 screws fixing the PCB on the input terminals gently take apart the PCB and reverse it Remove the fuse by gently prying one end loose then take out the fuse from its bracket Install ONLY replacement fuses with the identical type
20. is shown on the display 3 Connect the test leads across with the object being measured The measured value shows on the display Note It is recommended to use MVeee range The polarity of trigger slope is positive The attenuate amplitude of signal is different from different measuring positions and ranges therefore the required input amplitude is different when measuring duty cycle at different measuring positions and ranges When duty cycle measurement has been completed disconnect the connection between the testing leads and the circuit under test 27 Model UT70C OPERATING MANUAL MAX MIN Recording Mode 1 see figure 13 EM black figure 13 MAX MIN recording mode applies to all measurement functions except at conductance measurement function MAX MIN recording mode captures and stores the maximum and minimum input value detected and calculates a running average of all readings taken In the MAX MIN mode when the Meter detects an input that is below the recorded minimum or above the recorded maximum the Meter beeps and records the new minimum MIN or maximum MAX value In the MAX MIN mode you can also display a running average of all readings taken since the MAX MIN mode was activated Displaying the average reading allows you to smooth a rapidly changing input by displaying a stable reading on the digital display The MAX MIN mode has a pre set response time of 100ms
21. ly Open circuit voltage approximate 0 7 V At 800 80M Range Open circuit voltage approximate 0 7 V Conductance Test 80ns 80nS 12 5MQ D Capacitance Range Resolution Accuracy sd inF 1pF 8 5 10nF 10pF 100nF 100pF 2 3 THF 500V rms 10HF 10n TOOPF i00nF 8 5 Remark Reading under 1nF is only for reference E Diodes Test Range Resolution Overload Protection Diode 1mV V rms Remarks Open circuit voltage approximate 3V Displays approximate forward voltage drop reading 38 Model UT70C OPERATING MANUAL Accuracy Specifications 3 F DC Current i Overload Range Resolution Accuracy Protection 80mA 108A 1A 250V fast type glass fuse 5x20mm 800mA 100 4 0 39642 34 8A 1mA 10A 250V fast type 10A 10mA glass fuse 5x20mm Remark At8A amp 10A Range For continuous measurement 10 seconds and interval time between 2 measurements greater than 15 minutes G AC Current Range Resolution Accuracy orae 80mA 10BA 1A 250V fast type 0 8 2 glass fuse 5x20mm 800mA 100HA 8A 1mA 10A Remarks At8A amp 10A Range For continuous measurement lt 10 seconds and interval time between 2 measurements greater than 15 minutes Displays effective value of sine wave mean value response Frequency response 40Hz 1kH
22. nd it will automatically off after about 60 seconds Press and hold 3 for about 2 seconds to turn the Display Backlight off Analogue Bar Graph Display The analogue bar graph likes the needle in a traditional analogue meter AMM It refreshes 50 times a sec which is 10 times faster than that of digital display and is applied to zero adjustment and observation of rapidly changing signal that make digital display hard to read The analogue display is divided uniformly into 10 scales and composed of 41 segments of which the full range value corresponds to the full range value of the measurement range that has been selected The polarity of the measured value is displayed as on the left of the analogue display positive polarity is not displayed For example when 80V range is selected the full range value of the analogue display is 80V and as the full range is uniformly divided into 10 grades each grade denotes 8V If the input is 40V the high lighted bar shape will be at the position indicated by the number 5 if the input is 40V a sign will appear on the left of the analogue display There is no analogue displaying value when making measurement of frequency diode conductance and capacitance 34 Model UT70C OPERATING MANUAL Full Icons Display If the Meter is turned on with any functional button being pressed on the LCD will display all the icons and maintain this mode until the button is released 3 s
23. nformation To avoid electrical shock or damage to the Meter do not get water inside the case A General Service Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents Tocleanthe terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings Turn the Meter to OFF position when it is not in use and take out the battery when not using for a long time Donot store the Meter in a place of humidity high temperature explosive inflammable and strong magnetic field 41 Model UT70C OPERATING MANUAL Maintenance 2 B Testing the Fuses ZN warning To avoid electrical shock or personal injury remove the test leads and any input signals before replacing the battery or fuse To prevent damage or injury install ONLY replacement fuses with identical amperage voltage and speed ratings To test the fuse 1 Set the rotary switch to O4 and select by pressing 2 Plug a test lead into the terminal JEVOHZ and touch the probe tip to the 10A or mA terminal If the Meter beeps the fuse is good If the display shows OL replace the fuse and test again If the display shows any other value have the Meter serviced and contact your dealer immediately If the Meter does not work while the fuse is all right send it to your dealer for repair 42 Model UT70C OPERATING MANUAL Maintenance 3 C Replac
24. ontinuity see figure 6 black figure 6 To test for continuity connect the Meter as below 1 Insert the red test lead into the 46V Q Hz terminal and the black test lead into the COM terminal 2 Set the rotary switch to 9 4 and press 1 to select M measurement mode 3 The buzzer sounds if the resistance of a circuit under test is less than 1000 Note The LCD displays OL indicating the circuit being tested is open When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test 19 Model UT70C OPERATING MANUAL Measurement Operation 5 Resistance Measurement see figure 7 The resistance ranges are 800 00 8 000kQ 80 00kO 800 0kQ 8 000MQ 80 00M Q To measure resistance connect the Meter as follows 1 Insert the red test lead into the 4 VQHz terminal and the black test lead into the COM terminal 2 Set the rotary switch to MOE resistance measurement is default or press to select Q measurement mode 3 Connect the test leads across with the object being measured The measured value shows on the display Note The test leads can add 0 10 to 0 2 Qof error to resistance measurement To obtain precision readings in low resistance measurement that is the range of 800 00 short circuit the input terminals beforehand using the relative value function button RELA to automatically subtract the
25. r test 25 Model UT70C OPERATING MANUAL Measurement Operation 11 G Frequency amp Duty Cycle Measurement see figure 12 fem R Peradi br Buty Ore As i Li black figure 12 Frequency Measurement The measurement ranges are 1kHz 10kHz 100kHz and 1MHz The maximum measurement range is 1MHz To measure frequency connect the Meter as follows 1 Insert the red test lead into the JEVO Hz terminal and the black test lead into the COM terminal 2 Set the rotary switch to any voltage or current measurement positions 3 Press Hz to display the frequency of present signal 4 Connect the test leads across with the object being measured The measured value shows on the display Note It is recommended to use MVsee range which has the highest sensitivity The attenuate amplitude of signal is different from different measuring positions and ranges therefore the required input amplitude is different when measuring frequency at different measuring positions and ranges When Hz measurement has been completed disconnect the connection between the testing leads and the circuit under test 26 Model UT70C OPERATING MANUAL Measurement Operation 12 Duty Cycle Measurement The duty cycle measurement range is 0 01 99 99 To measure duty cycle 1 Set up the Meter to measure frequency 2 select duty cycle press Hz again or until the symbol
26. r use Turn off the Meter 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 UT70C OPERATING MANUAL International Electrical Symbols AC Alternating Current DC Direct Current AC or DC Grounding Double Insulated Deficiency of Built In Battery Continuity Test Diode Capacitance Test Fuse Warning Refer to the Operating Manual Conforms to Standards of European Union O O Front Case O 2 LCD Display 3 Functional Buttons Rotary Switch Input Terminals figure 1 Model UT70C OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary Switch positions Rotary Function Switch Position OFF Power is turned off VN AC voltage measurement Ve DC voltage measurement mVeee DC millivolt measurement en Continuity test Resistance measurement Capacitance test H Diode Test AC or DC Current Measurement from 0 001A to 10 00A AC or DC Current Measurement from 0 1mA to 800 0mA Model UT70C OPERATING MANUAL Functional Buttons 1 Below table indicated for information about the functional button operations
27. response time MAX MIN readings for the frequency counter are recorded only in the 1 second high accuracy response mode To exit the Press MAX MIN for over 1 second MAX MIN The Meter exists MAX MIN Recorded mode values are erased and the Meter stays in the selected range 29 Model UT70C OPERATING MANUAL PEAK MAX MIN Mode see figure 14 esponse time black figure 14 PEAK MAX MIN mode is an additional function of Pressing to toggle between 100ms response time and 1ms response time This function can only be enabled when the Meter is under REC mode or REC mode plus Hold mode except at 4 mode To enter PEAK MAX MIN mode Press MAX MIN or MAX MIN and HOLD to enter REC mode Then press to enter PEAK MAX MIN mode 1ms response time it steps through the sequence of MAX and MIN reading ONLY 30 Model UT70C OPERATING MANUAL Operation of Hold Mode LN warning To avoid possibility of electric shock do not use Hold mode to determine if circuits are without power The Hold mode will not capture unstable or noisy readings The Hold mode is applicable to all measurement functions With the Auto Hold function it automatically holds the present reading on the display freeing you to concentrate on the placement of the test leads when working in dangerous or difficult situations Press HOLD to enter Hold mode the Meter beeps Press HOLD again or RA
28. t resistance value is kept Press 467 to select capacitance test Press 4ES to select DC or AC current DC is default At OFF To disable the Sleep Mode press position 467 while turning on the Meter RELA Any rotary Press RELAto enter and exit the switch Aand A 96 mode in any measuring position mode the Meter beeps Hz Van Vis 1 Press Hz to enter frequency mV AS measurement mode the Meter beeps 2 Press Hz again to enter duty cycle measurement mode the Meter beeps 3 Press Hz again to return to the last measurement mode the Meter beeps Display Backlight Press3K once to turn the Display Backlight on and it shall shut off automatically in around 60 seconds later 1 Model UT70C OPERATING MANUAL Display Symbols 1 see figure 2 8 9 pc lt 9 Oemar roo BOBO s V zBBBBBs DE pom 00ms REGMAX MINVG H MAII 2 figure 2 Meaning The Meter is in the auto range mode in which the Meter automatically selects the range with the best resolution 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 Indicates negative reading Test of diode The continuity buzzer is on The relative value mode is on which displa
29. to the Meter from electric shock please do not attempt to measure voltages higher than 1000V 750V rms although readings may be obtained The DC Millivolt ranges are 80 00mV and 800 0mV These ranges have more than 4000MQ To measure DC Millivolt connect the Meter as follows 1 Insert the red test lead into the 4 V Hz terminal and the black test lead into the COM terminal 2 Setthe rotary switch to mV see 3 Connect the test leads across with the object being measured The measured value shows on the display Note In each range the Meter has an input impedance of 10MQ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kQ the error is negligible 0 196 or less When DC millivolt measurement has been completed disconnect the connection between the testing leads and the circuit under test 18 Model UT70C OPERATING MANUAL Measurement Operation 4 D Measuring Continuity Resistance Conductance amp Capacitance Z waring To avoid damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measuring continuity resistance conductance and capacitance When measuring capacitance use the DC Voltage function to confirm that the capacitor is discharged Never attempt to input over 60V in DC or 30V rms in AC to avoid personal dangerous Testing for C
30. ual otherwise the protection provided by the Meter may be impaired In this manual a Warning identifies conditions and actions that pose hazards to the user or may damage the Meter or the equipment under test A Note identifies the information that user should pay attention on International electrical symbols used on the Meter and in this Operating Manual are explained on page 8 Model UT70C OPERATING MANUAL Rules For Safe Operation 1 ZA 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 marked 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 Never working at an effective voltage over 60V in DC or 30V rms in AC for there is danger of electric shock
31. value measured when the testing leads are short circuited from the reading For high resistance measurement 21M it i normal taking several seconds to obtain a stable reading 20 Model UT70C OPERATING MANUAL Measurement Operation 6 The LCD displays BL indicating open circuit for the tested resistor or the resistor value is higher than the maximum range of the Meter When resistance measurement has been completed disconnect the connection between the testing leads and the circuit under test Conductance Measurement see figure 8 figure 8 The resistance ranges from 0 01nS to 80nS To measure conductance connect the Meter as follows 1 Insert the red test lead into the AEVOHz terminal and the black test lead into the COM terminal 2 Set the rotary switch to O4C and press RANGE to select nS measurement mode 3 Connect the test leads across with the object being measured The measured value shows on the display Note It is possible to press HOLD to toggle between conductance and resistance value during the measurement of conductance When conductance measurement has been completed disconnect the connection between the testing leads and the circuit under test 21 Model UT70C OPERATING MANUAL Measurement Operation 7 Capacitance Measurement see figure 9 black figure 9 The Meter s capacitance ranges are 1 000nF 10 00nF 100 0nF 1 000
32. y the present value minus the stored value The relative percentage value mode is on It displays the percentage value of the relative value and stored value DATA Data hold is active HOLD DC AC Indicator for DC AC voltage or current The displayed value is the mean value 8000mV Display the present chosen range 96 Percent used for duty cycle measurements 12 Model UT70C OPERATING MANUAL Display Symbols 2 a O Ohm The unit of resistance O Aka Kilohm 1 x 108 or 1000 ohms KO MA o Megohm 1 x 105 or 1 000 000 ohms Hz kHz Hz Hertz The unit of frequency MHz kHz Kilohertz 1 x 10 or 1000 hertz MHz Meghertz 1 x 10 or1 000 000 hertz V mV JV Volts The unit of voltage mV Millivolt 1 x 10 or 0 001 volts A mA A Amperes amps The unit of current mA Milliamp 1 x 10 or 0 001 amperes F pF nF F Farad The unit of capacitance HF Microfarad 1 x 10 or 0 000001 farads nF Nanofarad 1 x 10 or 0 000000001 farads nS S Siemens The unit of conductance nS Nanosiemens 1 x 10 or 0 000000001 siemens B recording mode enabled Present reading displayed 100ms 100ms response time MAX Maximum reading displayed MIN Minimum reading displayed AVG Average reading displayed Analogue Provides an analogue indication of the Bar present input quick response Graph Polarity indicator for the analogue bar
33. z 1 2 2 10A 250V fast type glass fuse 65x20mm 39 Model UT70C OPERATING MANUAL Accuracy Specifications 4 H Frequency amp Duty Cycle Frequency At mV see Range Overload Remarks Input sensitivity as follows 100kHz lt 100mV rms 2100kHz S500mV rms Maximum input amplitude 30V rms Frequency At V Aw amp Vees Range Range Resolution Accuracy Protection 0 01Hz 0 142 4 0020611 500V rms Range Accuracy Overload Protection 10Hz 100kHz 0 1 3 1000V Remarks Input amplitude 2500mV rms Maximum input amplitude 30V rms Frequency At A AJ 8 mA Range Range Accuracy Overload Protection 1A 250V fast type 50Hz 10kHz 0 1 3 glass fuse 5x20mm 10A 250V fast type glass fuse q5x20mm Remark Input amplitude 23000 digits Duty Cycle F Overload Range Resolution Accuracy Protection 1 99 0 01 1 5 500V rms 40 Model UT70C OPERATING MANUAL Accuracy Specifications 5 Remarks Reading is only for reference purpose AtmVess 8V Range Positive pulse width 230Hs Maintenance 1 This section provides basic maintenance information including battery and fuse replacement instruction A waring 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 i
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