Uni-Trend UT70D multimeter
Contents
1. Item Description Qty 1 English Operating Manual 1 piece 2 Test Lead 1 pair 3 Test Clip 1 piece 4 9V Battery NEDA 1604 6F22 1 piece or 006P installed 5 RS232C Interface Cable 1 piece 6 CD ROM Installation Guide amp 1 piece Computer 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 UT70D OPERATING MANUAL Safety Information CE Version The Meter complies with the standards IEC61010 1 in pollution degree 2 overvoltage category CAT Ill 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 Il Local level appliance PORTABLE EQUIPMENT etc with smaller transient voltage overvoltages than CAT Ill 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 manual otherwise the protection provided by the Meter may be impaired In this manual a Warning identifies conditions and actions that pose hazards to the user or may damage the Meter or the equipment under test A Note identifies the information that user should pay attention on International electrical symbols used on the Meter and in this Operating2. button to select capacitance 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 e For testing the capacitor with polarity connect the red test lead to anode amp black test lead to cathode When capacitance testing has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter 22 Model UT70D OPERATING MANUAL Measurement Operation 8 E Testing Diodes see figure 9 L zes figure 9 ZN warning To avoid damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measuring 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 1 Insertthe red test lead into the 1EVQHz 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 JEVOHz terminal red test lead to anode amp COM terminal black test lead to cathode The measured
3. DC Direct Current AC or DC Grounding Double Insulated Warning Refer to the Operating Manual Deficiency of Built In Battery Continuity Test Diode Capacitance Test Fuse Conforms to Standards of European Union Ai The Meter Structure see figure 1 Front Case LCD Display F lil Functional Buttons d Rotary Switch L 2 Input Terminals Tr as O OOSO figure 1 Model UT70D OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions Rotary Switch Function Position OFF Power is turned off VN AC voltage measurement Vive DC voltage measurement mVsee DC millivolt measurement _ Continuity measurement my QAE Q Resistance measurement dt Capacitance measurement oh Diode measurement AC or DC current measurement range AR from 0 1mA to 10 000A MARS AC or DC current measurement range from 0 001mA to 800 00mA Model UT70D OPERATING MANUAL Functional Buttons 1 Below table indicated for information about the functional button operations Button Function Operation Performed Sbai nga Tum the continuity buzzer on and Continuity off in the Resistance measurement Test mode Power Up Press while turning on the a Opti Meter to disable the beeper ption e of pressing any button To toggle betwe
4. Model UT70D OPERATING MANUAL Table of Contents Title Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure Rotary Switch Functional Buttons Display Symbols Measurement Ranges A Selecting a Measurement Range B Manual Ranging and Autoranging Measurement Operation AC Voltage Measurement DC Voltage Measurement DC Milivolt Measurement Measuring Resistance Conductance Capacitance and Continuity E Testing Diodes s F DC or AC Current Measurement G Frequency amp Duty Cycle Measurement MAX MIN Recording Mode PEAK MAXMIN Mode Operation of Hold Mode Operation of Auto Hold Mode The Use of Relative Value and Relative Percentage Value Mode Turning on the Display Backlight Analogue Bar Graph Display Sleep Mode General Specifications DODD Model UT70D OPERATING MANUAL Title Page Accuracy Specifications ewe 37 A AC Voltage B DC Voltage C Continuity Resistance amp Conductance Test D Capacitance E Diodes Test F DC Current G AC Current H Frequency amp Duty Cycle Maintenance me A General Service B Testing the Fuses C Replacing the Battery D Replacing the Fuses RS232C Serial Port A RS232C Port Cable u B Setting of RS232C Serial Ports oo 46 C System Requirements for Installing the UT70D Interface Program Model UT70D OPE
5. 2 80 000M 2 To measure the resistance Conductance 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 4 Q resistance measurement is default 3 Connect the test leads across with the object being measured The measured value shows on the display 19 Model UT70D OPERATING MANUAL Measurement Operation 5 Note The test leads can add 0 12 to 0 2 Q of error to resistance measurement To obtain precision readings in low resistance measurement that is the range of 800 00 Q short circuit the input terminals beforehand using the relative measurement function button REL to automatically subtract the value measured when the testing leads are short circuit from the reading For high resistance higher than 1M Q it is normal that it will take several seconds to obtain a stable reading When measure resistance higher than 12 5M 9 conductance value can be displayed by pressing HOLD To switch to resistance value press HOLD again Although it is possible to select frequency and duty cycle measurement mode these functions cannot be used Although it is possible to select frequency and duty cycle measurement mode these functions cannot be used When the resistance or conductance test has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing
6. Q 0 5 20 80 000M Q 1k Q 2 20 80 000nS 0 001nS 2 120 Continuity Test 0 01 Q lt 100Q Remarks Continuity Test Range Buzzer beeps continuously Open circuit voltage approximate 0 7V At 800 00 Q 80 000M Q Range Open circuit voltage approximate 0 7V Conductance Test 80 000nS 80nS 12 5M Q D Capacitance Range Overload Resolution Accuracy Protection 1 000nF 1pF At eter a 10 00nF 100 0nF 10 00 HF 4 2 3 600Vp 100 04 F 100nF 3 5 E Diodes Test Range Resolution Overload Protection Diode 1mV 600 Vp 38 Model UT70D OPERATING MANUAL Accuracy Specifications 3 Remarks Open circuit voltage approximate 3V Displays approximate forward voltage drop reading F DC Current Range Resolution Accuracy Overload Protection 80 000mA 1HA 1A 250V fast type glass fuse 65x20mm 0 2 40 800 00mA 10 HA 8 0000A 100HA 0 3 40 10A 250V fast type glass fuse 65x20mm 10 000A TA Remarks AtBA amp 10A Range For continuous measurement lt 10 seconds and interval time between 2 measurements greater than 15 minutes G AC Current Range Resolution Accuracy Overload Protection 80 000mA 1HA 0 5 40 1A 250V fast type 800 00mA 10HA glass fuse 45x20mm 8 0000A 1004A 0 8 40 10A 250V fast type 10 000A
7. The current measurement has 2 measurement positions on the rotary switch AZ and MAF The AW has a 8 0000A and 10 000A range with autoranging the mA has a 80 000mA and 800 00mA range with auto ranging To measure current connect the Meter as follows 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Insert the red test lead into the A or mA terminal and the black test lead into the COM terminal Use the A terminal and AW range if the current value to be tested is an unknown 3 Set the rotary switch to Aor MAT 4 The Meter defaults to DC current measurement mode To toggle between DC and AC current measurement function press At 5 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 6 Turn on power to the circuit The measured value shows on the display The AC current value displayed is a True RMS value 25 Model UT70D OPERATING MANUAL Measurement Operation 11 G Frequency amp Duty Cycle Measurement see figure 11 figure 11 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 4EVOHz terminal and the black test lead into the COM terminal 2 Set the rotary switch to any measurement pos
8. UL Version UL 61010B 1 CAT II 1000V overvoltage double insulation standard Certification CE UL This meter is suitable for indoor use 36 Model UT70D OPERATING MANUAL Accuracy Specifications 1 Accuracy a reading b digits guarantee for 1 year Operating temperature 23 C 5 C Relative humidity lt 80 A AC Voltage Overload Range Resolution 40 50Hz Protectio 50 60Hz 60 400Hz soo oomvl 10v EO 8 60 1 5 60 m 0 8 40 1 5 40 1000V 8 0000V 100uv_ 80 000V 0 8 20 1 5 20 rms 800 00V 1000 0V DC AC continuous Remarks B DC Voltage Input impedance 210MQ Displays True RMS value Frequency response 40 400Hz When input signal 2 8mV When input signal gt 80mv Range Resolution Accuracy Overload Protection 80 000mV 1uV 800 00mV 10 HV 0 05 40 0 05 20 8 0000V 100 LV 0 05 20 1000V DC AC 80 000V 1mV 800 00V 1000 0V 100mV 0 05 10 rms scontinuous Remarks e At80 00mV 800 00mV Range Input impedance 24000MO At 8 0000V 1000 0V Range Input impedance z 10MQ 37 Model UT70D OPERATING MANUAL Accuracy Specifications 2 C Resistance Conductance amp Continuity Test Range Resolution Accuracy Le 800 00 Q 0 012 0 3 60 8 0000k Q 010 80 000k Q 10 0 3 40 800 00k Q 10 Q 600Vp 8 0000M 2 100
9. d9 OL The input value is too large for the selected range Computer and the Meter is connected properly Data output is in progress 13 Model UT70D OPERATING MANUAL Measurement Ranges 1 A measurement range determine 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 Ifthe 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 or exit the manual range mode 14 Model UT70D OPERATING MANUAL Measurement Ranges 2 Press RANGE The Meter enters the manual range mode and turns off Each presses of RANGE increments the range When the highest range is reached the Meter wraps to the lowest range 2 To
10. display a running average of al 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 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 29 Model UT70D OPERATING MANUAL MAX MIN Recording Mode 2 MAX MIN To view the MAX MIN AVG or present reading Function Action Make sure that the Meter is in the desired measurement function and range Press MAX MIN to enter MAX MIN recording mode The present reading is displayed and Enter the the Meter is locked in the present range and MAX MIN REC is displayed mode 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 Press MAXIMIN to step through on the sequence of present readings high MAX low MIN and average AVG readings To stop and resume recording without erasing stored value Press HOLD to stop recording the recorded values will not erase Press HOLD again to resume recording To select response time The pre set response time is 100ms Press 1 to select 1ms response time in MAX MIN mo
11. exit the manual range mode press and hold RANGE for over 1 seconds The Meter returns to the autorange mode and is displayed Note In Hold 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 e Press RANGE while turning on the power to enter 80 000 counts resolution except at capacitance measurement 15 Model UT70D OPERATING MANUAL Measurement Operation 1 A AC Voltage Measurement see figure 3 figure 3 ZN wering To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000V though the 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 2 3 Insert the red test lead into the 4 VQHz terminal and the black test lead into the COM terminal Set the rotary switch to V 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 10
12. Manual are explained on page 8 Model UT70D OPERATING MANUAL Rules For Safe Operation 1 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 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 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 Disconnect circuit power and d
13. Millivolt Measurement see figure 5 figure 5 ZN Warnia To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000V though the reading may be obtained The DC Millivolt ranges are 80 000mV 800 00mV To measure DC Voltage 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 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 e In this range the Meter has an input impedance higher than 4000M 2 When DC mV voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter 18 Model UT70D OPERATING MANUAL Measurement Operation 4 D Measuring Resistance Conductance Capacitance amp Continuity L warning To avoid damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measuring resistance capacitance amp continuity Use the DC voltage function to confirm that the capacitor is discharged Resistance Conductance Measurement see figure 6 figure 6 The resistance ranges are 800 00 2 8 0000k 2 80 000k 2 800 00k 2 8 0000M
14. RATING 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 A 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 80 000 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 multi functions The Meter can be widely used in laboratory field service domestic and other applications All the functions and ranges have full overload protection In addition to the conventional measuring functions it is equipped with a RS232C standard serial port for easy connection with computer to realize macro recording and monitoring and capture of transient dynamic data displaying change of waveform during the measurement providing data and evidence to engineering technicians for scientific research This is also a highly applied digital multimeter of good performance with display backlight Model UT70D 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
15. cally holds the present reading on the display freeing you to concentrate on the placement of the probes when working in dangerous or difficult situations Press HOLD to enter or exit the HOLD mode Press HOLD to enter HOLD mode the Meter beeps e Press HOLD again or RANGE or turn the rotary switch to exit HOLD mode the Meter beeps e In HOLD mode DATA HOLD is displayed on the LCD When measure resistance higher than 12 5M conductance value can be displayed by pressing HOLD To switch to resistance value press HOLD again 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 e 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 LINI T Model UT70D OPERATING MANUAL The use of Relative Value and Relative Percentage Value Mode The Aand A mode applies to all measurement functions with auto ranging REL A mode can be used together with AUTO HOLD and MAX MIN mode The definition is as follows Relative value A present value stored value For ins
16. de In 1ms response time it steps through on the sequence of MAX and MIN only At the frequency measurement mode it should be 1second response time With the rotary switch in the OFF position press and hold down MAX MIN while turning on the rotary switch to select 1 second high accuracy response time To exit the MAX MIN mode Press MAX MIN for over 1 second to exit the mode Recorded values are erased and the Meter stays in the selected range 30 Model UT70D OPERATING MANUAL PEAK MAX MIN Mode see figure 13 le Select MIN ore E oS eee figure 13 PEAK MAX MIN mode is an additional function of Pressing 9 to toggle between 100ms response time and 1ms response time This function can only be enabled when the Meter is under MAX MIN HOLD mode To enter PEAK MAX MIN mode e Press to enter PEAK MAX MIN mode 1ms response time it steps through the sequence of MAX and MIN reading only Press HOLD under 1ms recording mode to stop recording without erasing stored values Press HOLD again to resume recording 31 Model UT70D OPERATING MANUAL Operation of Hold Mode ZN 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 automati
17. e measured value shows on the display Note e Press the Hz button in the MAX MIN HOLD mode it exits these modes e The attenuate amplitude of signal is different from different measuring positions and ranges therefore the required input amplitude is different when 27 Model UT70D OPERATING MANUAL Measurement Operation 13 measuring frequency at different measuring positions and ranges Although it is possible to select frequency and duty cycle measurement mode at resistance continuity and diodes ranges these functions cannot be used It is recommended to use DCV 8V range The polarity of trigger slope is positive When duty cycle measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter 28 Model UT70D OPERATING MANUAL MAX MIN Recording Mode 1 see figure 12 Ee PRAES AGE figure 12 MAXIMIN recording mode applied to all measurement function except at conductance measurement function MAXIMIN 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
18. e the fuse is all right send it to your dealer for repair 43 Model UT70D OPERATING MANUAL MAINTENANCE 3 G Replacing the ree see figure 14 ZN Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator To replace the battery 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 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 Model UT70D OPERATING MANUAL MAINTENANCE 4 D Replacing the Fuses see figure 14 AN 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 pry
19. en 100ms 100ms bee Nm response time and 1ms response REC time under REC mode except MAX Max resistance and capacitance range MIN Starts recording of maximum and minimum values Steps the display through the sequence of REC present high MAX low MIN and average AVG readings at Mode any mode except at conductance ven MAX mode In 1ms response time MIN it steps through only MAX and MAX MIN reading AE To select 1 second high accuracy Power Up response time press and hold Option down MAX MIN while turning the rotary switch to any function setting e Press RANGE to toggle Manual between manual ranging range and auto ranging mode at auto range any rotary switch position options Press RANGE to step RANGE through the ranges available for the selected function Press RANGE while turning on Others the power to enter 80 000 counts resolution except at capacitance measurement 10 Model UT70D OPERATING MANUAL Functional Buttons 2 Button Function Operation Performed Lae Press HOLD down to enter the DATA Data holding Auto Hold mode at any mode t HOLD HOLD Press HOLD to switch between resistance and conductance value ns MQ Others at conductance or resistance measuring mode e Press 4 lt 1o select capacitance test at Q 4 Selecting measurement position capacitance Press At to select AC DC Fur 462 and DC AC mode at current measurement in position Power Up Press4 when
20. glass fuse o5x20mm Remarks e At8A amp 10A Range For continuous measurement lt 10 seconds and interval time between 2 measurement greater than 15 minutes 39 Model UT70D OPERATING MANUAL Accuracy Specifications 4 e Frequency response 40Hz 400Hz e Displays True RMS value H Frequency amp Duty Cycle Frequency At mVeee Range Range Resolution Accuracy ed 1KHz 0 01Hz TOkHz 0 THz TOOkHzZ THz 0 02 1 600Vp 1MHz 10Hz Remarks Input sensitivity as follows lt 100kHz S200mV rms 2100kHz lt 600mV rms Maximum input amplitude 30V rms Frequency At VAY amp Vees Range Range Accurac Overload Protection 10Hz 100kHz 0 1 3 600Vp Remarks Input amplitude 2600mV rms Maximum input amplitude 30V rms Frequency At AN amp mAN Range Overload Protection 1A 250V fast type glass fuse 65x20mm Range Accuracy 50Hz 10kHz 0 1 3 10A 250V fast type glass fuse 45x20mm Remark e Input amplitude 230000 digits 40 Model UT70D OPERATING MANUAL Accuracy Specifications 5 Duty Cycle Er Duty Cycle 19 1 99 0 01 600Vp Remarks Reading is only for reference purpose AtmVes 8V Range Positive pulse width 230us 41 Model UT70D OPERATING MANUAL MAINTENANCE 1 This section provides basic maintenance information including battery and fuse replacement instruc
21. 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 Installation Guide amp Computer Interface Software for installing and operating instructions of the UT70DInterface Program kk END Lid This operating manual is subject to change without notice 47 Model UT70D OPERATING MANUAL CCopyright 2002 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 info uni trend com http www uni trend com 48
22. ing one end loose then take out the fuse from its bracket Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket Fuse1 1A 250V fast type glass fuse 45x20mm Fuse2 10A 250V fast type glass fuse 45x20mm 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 reguired Burning of a fuse always results from improper operation 45 Model UT70D OPERATING MANUAL RS232C Serial Port 1 A RS232C Port Cable Merer Computer D sub D sub D sub 4 9 Pin 25 Pin 19 Pin Male Female 72 1 2 3 3 4 4 5 T 5 6 6 7 7 8 8 5 lear to Send B Setting of RS232C Serial Ports see figure 15 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 None figure15 46 Model UT70D OPERATING MANUAL RS232C Serial Port 2 C System Requirements for Installing the UT70D Interface Program To use UT70D Interface Program you need the following hardware and software An IBM PC or eguivalent computer with 80586 or higher processor and 640 x 480 pixel or better monitor Microsoft Windows 95 or above At least 16MB of RAM At least 8MB free space in
23. is on which displays the percentage of the A and the stored value Data hold is active Dc AC 8000mV The displayed value is the mean value Indicator for DC AC voltage or current Display the present chosen range Ao Percent used for duty cycle measurements 12 Model UT70D OPERATING MANUAL Display Symbols 2 E Q Ohm The unit of resistance MkQ k kilohm 1 x 10 or 1000 ohms Q Megohm 1 x 10 or 1 000 000 MO ohms Hz Hertz The unit of freguency Mk Hz kHz Kilohertz 1 x 10 or 1000 hertz MHz Meghertz 1x 10 or1 000 000 hertz V Volts The unit of voltage mV 3 mV Millivolt 1x 10 or 0 001 volts A Amperes amps The unit of mA current mA Milliamp 1 x 10 or 0 001 amperes Farad The unit of capacitance F Microfarad 1 x 10 or 0 000001 unF uF farads nF Nanofarad 1 x 10 or 0 000000001 farads S Siemens The unit of ns conductance nS Nanosiemens 1 x 10 or 0 000000001 siemens 43 Maximum minimum and average recording mode enabled Present reading displayed 100ms 100ms response time MAX Maximum reading displayed MIN Minimum reading displayed AVG Average reading displayed E Analogue Provides an analogue indication of the Bar present input quick response Graph KE Polarity indicator for the analogue bar raph display no display for positive
24. ischarge all high voltage capacitors before testing resistance continuity diodes current or capacitance Model UT70D OPERATING MANUAL Rules For Safe Operation 2 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 Remove test leads and RS232C interface cable 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 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 UT70D OPERATING MANUAL International Electrical Symbols AC Alternating Current
25. ition of Vw Viz mV A MAS 3 Press the Hz button once to display the frequency of present signal while measure the AC voltage or current 4 Connect the test leads across with the object being measured The measured value shows on the display Note Press the Hz button in the MAX MIN HOLD mode it exits these modes 26 Model UT70D OPERATING MANUAL Measurement Operation 12 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 Although it is possible to select frequency and duty cycle measurement mode at resistance continuity and diodes ranges these functions cannot be used It is recommended to use MV range which has the highest sensitivity To obtain a stable reading when measuring input scope gt 30V rms frequency signal set the rotary switch to Vw or V When frequency measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter Duty Cycle Measurement The duty cycle measurement range is 1 99 To measure duty cycle 1 Set up the Meter to measure frequency 2 To select duty cycle press Hz again or until the symbol is shown on the display 3 Connect the test leads across the object being measured Th
26. kQ the error is negligible 0 1 or less When AC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter 16 Model UT70D OPERATING MANUAL Measurement Operation 2 B DC Voltage Measurement see figure 4 ZN warning figure 4 To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000V though the reading may be obtained The DC voltage ranges are 8 0000V 80 000V 800 00V and 1000 0V To measure DC Voltage connect the Meter as follows f 2 3 Insert the red test lead into the EVOHZz terminal and the black test lead into the COM terminal Set the rotary switch to V 777 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 1 or less When DC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter 17 Model UT70D OPERATING MANUAL Measurement Operation 3 C DC
27. leads away from the input terminals of the Meter 20 Model UT70D OPERATING MANUAL Measurement Operation 6 Continuity Measurement see figure 7 ja eee el ji m F EA gt gt 4 figure 7 To measure the continuity connect the Meter as follows 1 2 3 Insert the red test lead into the 4 VQHzterminal and the black test lead into the COM terminal Set the rotary switch tom yen and press N to select sy measurement mode The buzzer sounds if the resistance of a circuit under test is less than 100 2 The LCD displays GL indicating the circuit being tested is open Press sy while turning on the Meter to disable the beeper of pressing any button Although it is possible to select frequency and duty cycle measurement mode these functions cannot be used When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter 21 Model UT70D OPERATING MANUAL Measurement Operation 7 Capacitance Measurement see figure 8 figure 8 The Meter s capacitance ranges are 1 000nF 10 00nF 100 0nF 1 000HF 10 00uF and 100 0HF To measure capacitance connect the Meter as follows 1 Insert the red test lead into the 4 VQHz terminal and the black test lead or test clip into the COM terminal 2 Set the rotary switch to 4EQ and press 4
28. splay 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 UT70D 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 seconds later Sleep Mode To preserve battery life the Meter automatically turns off if you do not turn
29. tance 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 A 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 REL is selected the Meter exits the REL A mode Press RELAto 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 the A value as the result Press RELA again to enterA 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 the value as the A result Press RELAagain or turn the rotary switch to reset the stored value and exit Aand A mode returning to normal measurement mode 33 Model UT70D OPERATING MANUAL Turning on the Display Backlight ZN varaire 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 and it will automatically off after about 60 seconds Press and hold for about 2 seconds to turn the Di
30. 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 4677 while turning on the Meter e n MAX MIN mode the Sleep Mode is disabled 35 Model UT70D OPERATING MANUAL General Specifications e Maximum Voltage 1000V rms between JEVOHz Terminals and Grounding o Fused Protection 1A 250V fast type glass for mA Input Terminal fuse 95x20mm o Fused Protection 10A 250V fast type glass for A Input Terminal fuse 5x20mm e Maximum Display 80000 EE 5 times Isecon Temperature ed 53 C 40 G 41 F 104 F Storage 10 C 50 C 14 F 122 F Relative Humidity lt 80 5 C 31 C lt 50 31 C 40 C e Altitude Operating 2000 m Storage 10000 m Battery Type One piece of 9V NEDA1604 or 6F22 or 006P Battery Deficiency Display E35 e Data Holding Display DATA HOLD Negative reading Display Overloading Display AL Equipped with full icons display Auto and manual range selectable Dimensions HxWxL 195 x 90 x 39 mm e Weight Approximate 550g battery included Safety Compliances CE Version IEC61010 CAT Ill 1000V CAT IV 600V overvoltage and double insulation standard
31. tion warning Do not attempt to repair or service your Meter unless you are gualified to do so and have the relevant calibration performance test and service information 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 To clean the 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 Do not store the Meter in a place of humidity high temperature and strong magnetic field 42 Model UT70D OPERATING MANUAL MAINTENANCE 2 B Testing the Fuses ZN Waiting 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 Q4E 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 GL 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 whil
32. tuming on the Option Meter to disable Sleep Mode function Relative value Press REL A to enter or exit A measurement mode at any rotary switch position A REL A Relative percentage Press REL Ato enter or exit A A Value mode at any rotary switch position ji measurement Press Hz once to enter frequency measurement in AC DC voltage or current measurement positions Hz Hz Duty cycle Press Hz twice to enter duty cycle Measurement measurement in AC DC voltage or current measurement positions Press 3 once to turn the Display Backlight on and it shall shut off lautomatically in around 60 seconds later 11 Model UT70D OPERATING MANUAL Display Symbols 1 see figure 2 O OA G BOOI gt SHAG BBs Die OS E22 10s REI Mc D AH gt g figure 2 PERE ot fF 4 OE 7 oe Symbol Meaning The Meter is in the auto range mode in which the Meter automatically selects the range with the best resolution S ik 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 d 1 The continuity buzzer is on A The relative value mode is on which display the present value minus the stored value A DATA HOLD 9 68839686 The relative percentage
33. value shows on the display Note e Ina 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 23 Model UT70D OPERATING MANUAL Measurement Operation 9 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 e The LCD will display GL indicating open circuit for wrong polarity connection e The unit of diode is Volt V displaying the positive connection voltage drop value e Although it is possible to select frequency and duty cycle measurement mode these functions cannot be used When diode testing has been completed disconnect the connection between the testing leads and the circuit under test F DC or AC Current Measurement see figure 10 c z al rey N figure 10 L 00 D 0 S B B Cl at i Es IE ZN Warming Never attempt an in circuit current measurement where the open circuit voltage between the circuit and ground is greater than 600V 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 them across any circuit Model UT70D OPERATING MANUAL Measurement Operation 10
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