Uni-Trend UT70B multimeter
Contents
1. 12 Model UT70B OPERATING MANUAL Display Symbols 2 see figure 2 A DC The relative value mode is on to display the stored value minus the present value H Data hold is active Indicator for DC voltage or current Kp AC Q KO MO Indicator for AC voltage or current The displayed value is the mean value Q Ohm The unit of resistance KO kilohm 1 x 10 or 1000 ohms MO Megohm 1 x 10 or 1 000 000 ohms Hz kHz MHz Hz Hertz The unit of freguency kHz Kilohertz 1 x 10 or 1000 hertz MHz Meghertz 1 x 10 or 1 000 000 hertz V mV V 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 13 Model UT70B OPERATING MANUAL Display Symbols 3 see figure 2 mF BF nF C F F Farad The unit of capacitance mF Millifarad 1 x 10 or 0 001 farads uF Microfarad 1 x 10 or 0 000001 farads nF Nanofarad 1 x 10 or 0 000000001 farads C Centigrade The unit of temperature F Fahrenheit The unit of temperature Maximum reading MIN Minimum reading Analogue Bar Graph Provides an analog indication of the present input quick response Polarity indicator for the analogue bar graph display no display for positive The input value is too large for the selected2. 10A Range For continuous measurement lt 10 seconds and interval not less than 15 minutes 36 Model UT70B OPERATING MANUAL Accuracy Specification 5 J AC Current Range Resolution Accuracy Overload Protection 400unA 100nA OOM 00n 1 5 5 4000uA 1pA 1A 250V fast type 40mA 10UA 29555 glass fuse 65x20mm 400mA 1004A 10A 10mA t 2 575 5 10A 250V fast typ glass fuse 5x20mm Remarks 400uA 400mA Range Displays effective value of sine wave mean value response 10A Range For continuous measurement lt 10 seconds and interval not less than 15 minutes Frequency response 40Hz 400Hz 37 Model UT70B OPERATING MANUAL Maintenance 1 This section provides basic maintenance information including battery and fuse replacement instruction ZN 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 off the power of the Meter 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
3. Fax 852 2950 9303 Email info uni trend com http www uni trend com 44
4. Model UT70B OPERATING MANUAL Table of Contents Title Page Overview z Z 3 Unpacking Inspection z E E 4 Safety Information PS z E 5 Rules For Safe Operation _ 6 International Electrical Symbols L 8 Functional Structure _ a a E 8 Rotary Switch E 9 Functional Buttons 2 5 E d 10 Display Symbols _ z 12 Manual Ranging and Autoranging fe es 5 Measurement Operation A DC Voltage Measurement 16 B AC Voltage Measurement AT C Measuring Resistance 18 D Testing for Continuity 19 E Testing Diode s 20 F Capacitance Measurement RE 21 G Frequency or Revolution Measurement E E 22 H Temperature Measurement Co uu 28 DC or AC Current Measurement amp 24 Operation of Hold Mode i 26 MAX MIN Recording Mode 5 2 27 The Use of Relative Value Mode 28 Analogue Bar Graph Display 29 Turning on the Display iudice EE EA 30 Full Icons Display z 30 Sleep Mode z 2 S E i 31 RS232C Button 2 f s 31 POWER Button E E 31 General Specification S Ni x 32 Model UT70B OPERATING MANUAL Title Page Accuracy Specification A DC Voltage 7 z z 33 B AC Voltage D 2 33 C Resistance amp Continuity Test 34 D Diode T
5. 1 ccc LCSLI ol red figure 3 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 750V TRMS although readings may be obtained black The DC Voltage ranges are 400 0mV 4 000V 40 00V 400 0V and 1000V To measure DC Voltage connect the Meter as follows 1 Insert the red test lead into the VQOHz terminal and the black test lead into the COM terminal 2 Set the rotary switch to VAG and press al to select DC measurement mode 3 Connect the test leads across with the object being measured The measured value shows on the display 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 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 16 Model UT70B OPERATING MANUAL Measurement Operation 2 B AC Voltage Measurement see figure 4 Select AC ma e amp red black figure 4 09099 meesal Bine cw 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 TRMS although rea
6. Il electronic equipment portable units Its transient overvoltage shall be less than that of CAT Ill CAT Ill Distribution level fixed installation with smaller transient overvoltages than CAT IV CAT IV Primary supply level overhead lines cablesystems etc Model UT70B OPERATING MANUAL Rules For Safe Operation 1 ZN warning To avoid possible electric shock or personal injury and to avoid possible damage to the Meter or to the eguipment under test adhere to the following rules Do not use this Meter in the event you find the test lead or insulation of the case obviously broken or you believe this Meter being malfunctioned When using the test leads keep your fingers behind the finger guards Do not impose any effective voltage over 1000V on the terminal and earth of the Meter to prevent electric shock and damage to the Meter When the Meter working at an effective voltage over 60V in DC or 30V in AC special care should be taken for there is danger of electric shock Do not operate the Meter with the case or part of the case removed there is danger of electric shock When replacing fuse or battery the test leads should be disconnected from the tested circuit and switch should be turned to off before opening the case Identical nominal fuse of guick response must be used for replacement of a broken fuse The rotary switch should be placed in the right position and no any changeover of range shall be
7. range Data output is in progress Gal S 2 Auto power off features is enable It can be disabled by pressing any one of RANGE MAX MIN REL or RS232C key when turning on the Meter 8 Revolution measurement Unit rev min 14 Model UT70B OPERATING MANUAL Manual Ranging and Autoranging Being in the right measurement range is important In the autorange AUTO 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 MANU 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 1 Press RANGE The Meter enters the manual range mode and turns off Each press of RANGE increments the range When the highest range is reached The Meter wraps to the lowest range NOTE If you manually change the measurement range after entering the Hold or MAX MIN recording modes the Meter exits these modes 2 To exit the manual range model press and hold RANGE for one second The Meter returns to the autorange mode and is displayed 15 Model UT70B OPERATING MANUAL Measurement Operation 1 A DC Voltage Measurement see figure 3 ET
8. rubber feet 40 Model UT70B OPERATING MANUAL Maintenance 4 D Replacing the Fuses see figure 12 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 To replace the Meter s fuse 1 2 Press the POWER to turn the Meter off and remove all connections from the terminals Remove the 2 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 and specification as follows and make sure the fuse is fixed firmly in the bracket Fuse 1 1A 250V fast type glass fuse 5x20mm Fuse 2 10A 250V fast type glass fuse h5x20mm 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 2 rubber feet Replacement of the fuses is seldom reguired Burning of a fuse always results from improper operation 41 Model UT70B OPERATING MANUAL RS232C Serial Port 1 A RS232C Port Cable Computer Remark RX Receiving Data TX Transmitting Data DTR Data Terminal Readyl GND Grounding DSR Data Set Ready RTS Request To S
9. then enter sleep mode pressing X5 can not activate the Meter If the Meter is activated by turning the rotary switch it will start from the switch selected function To disable the Sleep Mode function press any one of the MAX MIN RANGE RELA or RS232C while turning on the Meter RS232C Button Press RS232C button to enter or exit data output mode In RS232C serial port data output mode if the Meter is under the HOLD MAX MIN REL operations the Meter will display the corresponding operation s data However the serial port output the instantaneous data from the input terminals In RS232C serial port data output mode Sleep Mode function will be disabled POWER Button The POWER button is a self lock switch use to turn on or off the power of the Meter 31 Model UT70B OPERATING MANUAL General Specification Maximum Voltage between any Terminals and Grounding AFused Protection for HAMA Input Terminal AFused Protection for 10A Input Terminal Maximum Display Temperature Relative Humidity Altitude Battery Type Battery Deficiency Dimensions HxWxL Weight Continuity Test Certificate 1000V rms 1A 250V fast type glass fuse 65x20mm 10A 250V fast type glass fuse 5x20mm 13999 updates 5 second Operating 5 C to 40 C 41 F to 104 F Storage 10 C to 50 C 14 F to 122 F lt 80 5 C 31 C lt 50 31 C 40 C Operat
10. to disable auto power off feature RANGE Manualor 1 Press RANGE to enter the Auto Range manual ranging mode Selection Manually selecting a range causes the Meter to exit the Hold and MAX MIN modes 2 Press RANGE to step through the ranges available for the selected function 3 Press and hold RANGE for 1 second to return to autoranging 10 Model UT70B OPERATING MANUAL Functional Buttons 2 HOLD Data Holding Press HOLD to enter and exit the Hold mode in any mode Full Screen Press HOLD when turning on Display the Meter to keep full icons display RELA Relative Press REL A to enter and exit Value Test the REL mode in any mode RS232C Serial Port Turn on or off the serial port interface without changing the original setting 3X Display Press3 once to tum the display Backlight backlight on and it shall shut off in 15 seconds later 11 Model UT70B OPERATING MANUAL Display Symbols 1 see figure 2 the athe is A ge ae page BBBH aal Number Symbol 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 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 appears Indicates negative reading Test of diode The continuity buzzer is on
11. 38 Model UT70B 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 Qen and select by pressing MAD 2 Plug a test lead into the terminal M VOHZ and connect the probe tip to the 10A terminal Ifthe Meter beeps the fuse is good If the display shows QL overvoltage replace the fuse If the Meter does not work while the fuse is all right send it to your dealer for repair 39 Model UT70B OPERATING MANUAL Maintenance 3 C Replacing the Battery see figure 12 Rubber foot sho 2 Screw figure 12 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 EH appears To replace the battery 1 2 Press the POWER to turn the Meter off and remove all connections from the terminals Remove the 2 rubber foots and then 3 screws from the case bottom and separate the case top from the case bottom Remove the battery from the battery compartment 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 2
12. ATING MANUAL MAX MIN Recording Mode MAX MIN recording mode captures and stores the maximum and minimum input value detected To use the MAX MIN mode as follows Press MAX MIN to display the highest reading IMAXI is shown on display Press MAX MIN again to display the lowest reading LMIN is shown on display Press MAX MIN again to display the present reading LMAX MIN is flashing on display Press and hold MAX MIN for over 1 second to erase stored measurements and exit The Meter stays in the selected range In MAX MIN recording press HOLD to interrupt recording stored readings are not erased press HOLD again to resume recording When recording is interrupted the maximum minimum and present values are locked on the digital display but the analogue display continues to be active MAX MIN mode can be nested in REL mode The Meter displays the maximum or the minimum value relative to the present measurement value when MAX MIN is pressed in REL mode 27 Model UT70B OPERATING MANUAL The Use of Relative Value Mode The REL mode applies to all measurement functions It subtracts a stored value from the present measurement value and displays the result For instance if the stored value is 20 0V and the present measurement value is 22 0V the reading would be 2 0V If anew measurement value is equal to the stored value then display 0 0V To enter or exit REL mode Use RANGE to select the
13. In Battery Continuity Test Diode Capacitance Test Fuse Conforms to Standards of European Union Functional Structure see figure 1 OOOO Front Case d LCD Display Functional Buttons Rotary Switch Input Terminals Model UT70B OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions Rotary Switch Function Position Vo AC or DC Voltage Measurement AO Continuity Test or Resistance gt Diode Test 4c Capacitance Measurement Hz Frequency Measurement C Temperature in Celsius F Temperature in Fahrenheit AC or DC Current Measurement from H o 4uA to 4000pA AC or DC Current Measurement from mAN 0 01mA to 400 0mA AC or DC Current Measurement from A 0 01A to 10 00A Model UT70B OPERATING MANUAL Functional Buttons 1 Below table indicated for information about the functional button operations Button Function Operation Performed POWER Power Switch Tum the power on and off zz Continuity Tum the continuity buzzer on and Test off DC or AC Toggle between DC or AC Test Switch voltage and current test MAX MIN Maximum Starts recording of maximum and and Minimum minimum values Steps the Display display through high MAX low MIN and present readings at any mode Disable Auto Press MAX MIN when turning Power Off jon the Meter
14. NI T Model UT70B OPERATING MANUAL Accuracy Specification 3 E Capacitance Range Resolution Accuracy Overload Protection Measure at 4nF 1pF REL mode 4 10 40nF 10pF 400nF 100pF 600Vp 4uF 1nF 4 3 40uF 10nF 400uF 100nF 4mF 1uF 5 10 40mF 10uF emarks 40mF Range Reading is only for reference purpose F Frequency Range Resolution Accuracy Overload Protection 4kHz 1Hz 40kHz 10Hz 400kHz 100Hz 0 1 3 600Vp 4MHz 1kHz 40MHz 10kHz 400MHz 100kHz emarks Input sensitivity S40MHz S200mV rms S100MHz S1V rms 2100MHz Reference value only 35 Model UT70B OPERATING MANUAL Accuracy Specification 4 G Resolution Range Resolution Accuracy Overload Protection 40kRPM 10RPM 0 1 3 600Vp emarks RPM freguency transducer needed H Temperature Range Resolution Accuracy 40C 0C 3 4 40 C 1000 C 1C 0 C 400 C 1 3 400 C 1000 C 2 10 AUF 32F 3 4 AUF 1832F 1 F 32F 752F 1 4 752F 1832F 42 5 Remarks Overload Protection 600Vp l DC Current Range Resolution Accuracy Overload Protection 400UA 100nA 4000UA 1UA 40mA 10HA 400mA 100UA 1 2 1A 250V fast type 1 2 3 glass fuse 5x20mm 10A 10mA 1 576 5 10A 250V fast type glass fuse 5X20MM Remarks
15. ch to Oe and press AZ to select measurement mode 3 Connect the test leads across with the object being measured The measured value shows on the display The test leads can add 0 19 to 0 2Q of error to resistance measurement To obtain precision readings in low resistance measurement that is the range of 400 0Q short circuit the input terminals beforehand using the relative measurement function button RELA to automatically subtract the value measured when the testing leads are short circuited from the reading 18 Model UT70B OPERATING MANUAL Measurement Operation 4 For high resistance measurement gt 1MQ it is normal that it will take several seconds to obtain a stable reading When resistance 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 D Testing for Continuity see figure 6 black JII figure 6 A warning To avoid damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before testing for continuity To test for continuity connect the Meter as below 1 Insert the red test lead into the M VOHZ terminal and the black test lead into the COM terminal 2 Set the rotary switch to Om and press sl to select measurement mode 3 The buzzer sounds if the resistance of a circuit under
16. dings may be obtained The AC Voltage ranges are 4 000V 40 00V 400 0V and 750V To measure AC Volta e congect the Meter as follows 1 Insert the red test lead into the M VOHZ terminal and the black test lead into the COM terminal 2 Set the rotary switch to VA and press AJ to select AC measurement mode 3 Connect the test leads across with the object being measured The measured value shows on the display In each range the Meter has an input impedance of 10MO 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 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 17 Model UT70B OPERATING MANUAL Measurement Operation 3 C Measuring Resistance see figure 5 figure 5 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 resistance The resistance ranges are 400 002 4 000kQ 40 00kO 400 0kQ 4 000MQ and 40 00MQ To measure resistance connect the Meter as follows 1 Insert the red test lead into the M VOHZ terminal and the black test lead into the COM terminal 2 Set the rotary swit
17. e 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 For safety sake the measuring time for high current should be less than 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 under test and remove the testing leads away from the input terminals of the Meter 25 Model UT70B 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 Press HOLD to enter Hold mode the Meter beeps Press HOLD again or RANGE or turn the rotary switch to exit Hold mode the Meter beeps In Hold mode H is displayed The Meter beeps when the selected range is overloaded or a positive result is obtained from continuity test whether it is under the Hold mode or not If you are in MAX MIN recording 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 Enabling Hold function in auto ranging mode makes the Meter switch to manual mode 26 Model UT70B OPER
18. e figure 11 we Select i C or DC figure 11 ZN 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 them across any circuit The current measurement has 3 measurement positions on the rotary switch uA mA and A The HA has a 400 0UA and 4000LA range with auto ranging the mA has a 40 00mA and 400 0mA range with auto ranging 10A position has only a 10 00A range To measure current do the following 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Insert the red test lead into the HA mA or 10A terminal and the black test lead into the COM terminal Use the 10A terminal and AAG range if the current value to be tested is an unknown 24 Model UT70B OPERATING MANUAL Measurement Operation 10 3 Set the rotary switch to HAS MAA or AAD 4 The Meter defaults to DC current measurement mode To toggle between DC and AC current measurement function press sa AC current is displayed as an mean value calibrated against sine wave effective value 5 Break the current path to be tested Connect the red test lead to the more positive side of th
19. end CTS Clear To Send B Setting of RS232C Serial Ports Default of RS232C serial port for communication is set as Baud Rate 2400 Start bit 1 always 0 Stop bit 1 always 1 Data bits 7 Parity Odd 42 Model UT70B OPERATING MANUAL RS232C Serial Port 2 C System Reguirements for Installing UT70B Interface Program To use UT70B Interface Program you need the following hardware and software An IBM PC or equivalent computer with 80486 or higher processor and 800 x 600 pixel or better monitor Microsoft Windows 95 or above At least 8 MB of RAM At least 8 MB free space in hard drive Can access to a local or 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 UT70B Interface Program END This operating manual is subject to change without notice 43 Model UT70B OPERATING MANUAL Copyright 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 Headguarters Uni Trend International Limited Address Rm901 9 F Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon Hong Kong Tel 852 2950 9168
20. est Me z 5 34 E Capacitance E 2 5 2 35 F Frequency z 2 35 G Revolution E 2 E 36 H Temperature 2 z 36 l DC Current z 7 E m 36 J AC Current 3 X 37 Maintenance A General Service e z 38 B Testing the Fuses E z 39 C Replacing the Battery 1 40 D Replacing the Fuses 41 ju d Serial Port RS232C Port Cable 42 5 Setting of RS232C Serial Ports 3 E E 42 C System Requirements for Installing the UT70B Interface Program 43 Model UT70B 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 This Digital Multimeter hereafter referred to as the Meter has autorange and manual range options and dual display with maximum reading 3999 displayed in 40 analogue bars in scale making the measured value to be seen clearly and indicating the trend of changing guickly In addition to the conventional measuring functions there is new breakthrough in freguency test with maximum range of 400 MHz RS232C standard serial port is eguipped with this Meter for easy connection with computer to realize macro recording and monitoring and Cap
21. ing 2000 m Storage 10000 m One piece of 9V NEDA1604 or 6F22 or 006P Display Ed 1195 x 90 x 39 mm Approximate 550g battery included 2 5kHz C UL This meter is suitable for indoor use 32 LINI T Model UT70B OPERATING MANUAL Accuracy Specification 1 Accuracy a reading b digits guarantee for 1 year Operating temperature 23 C 5 C Relative humidity lt 80 A DC Voltage Range Resolution Accuracy Overload Protection 400mV 0 8 3 4V 1000V DC 0 8 1 quse 750V AC 1 3 Remarks Input impedance 210MQ B AC Voltage 1 5 1000V DC 750V AC 750V 1V 1 2 5 Remarks Input impedance 210MQ Displays effective value of sine wave mean value response Frequency response 40Hz 400Hz 33 Model UT70B OPERATING MANUAL Accuracy Specification 2 C Resistance amp Continuity Test Resolution Overload Accuracy z Protection 0 10 1 2 2 10 1 2 1 2 2 40MO 10kQ 1 5 2 Continuity test 400 Remarks 4000 40MQ Range Open circuit voltage approx 3V Continuity Test Buzzer beeps continuous D Diode Test Range Resolution Overload Protection Diode 1mV 600Vp Remarks Open circuit voltage approximate 3V Displays approximate forward voltage drop 34 LI
22. made during measurement is conducted to prevent damage of the Meter The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident Replace the battery as soon as the battery indicator 3 appears With a low battery the Meter might produce false readings that can lead to electric shock and personal injury Model UT70B OPERATING MANUAL Rules For Safe Operation 2 Soft cloth and neutral 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 Do not use the Meter in an environment of high temperature and humidity Particularly not to put the Meter in a humid condition for storage The performance of the Meter may deteriorate after dampened Use the proper terminals function and range for your measurements The Meter is suitable for indoor use Turn off the Meter when it is not in use and take out the batter when not using ofr 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 UT70B OPERATING MANUAL International Electrical Symbols AC Alternating Current DC Direct Current AC or DC Grounding Double Insulated Warning Refer to the Operating Manual Deficiency of Built
23. range before selecting RELA If measurement range change manually after RELA is selected the Meter exits the REL mode Press RELA to enter REL mode auto ranging turns off and the present measurement range is locked Press RELA again to display the stored value Press and hold RELA again for longer than 1 second or turn the rotary switch to reset the stored value and exit REL mode Pressing HOLD in REL mode makes the Meter stop updating Pressing HOLD again to resume updating 28 Model UT70B OPERATING MANUAL Analogue Bar Graph Display The analogue bar graph likes the needle in a traditional analogue meter AMM It refreshes 30 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 into 4 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 on the left of the analogue display positive polarity is not displayed while negative polarity is identified with a sign on the left of the analogue display For example when 40V range is selected the full range value of the analogue display is 40V and as the full range is uniformly divided into 4 grades each grade denotes 10V If the input is 40V the high lighted bar
24. red test lead into the M VOHZ terminal and the black test lead into the COM terminal Set the rotary switch to Hz Connect the test leads across with the object being measured The measured value shows on the display 2 3 Press AJ to toggle between frequency measurement Hz and revolution measurement RPM mode Connect the Meter as above mentioned The revolution measurement range is 40 00k RPM although higher ranges can be displayed they are of little or no practical use When Hz or RPM 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 22 Model UT70B OPERATING MANUAL Measurement Operation 8 H Temperature Measurement see figure 10 figure 10 The C measurement range is 40 C 1000 C while F measurement range is 40 F 1832 F To measure temperature connect the Meter as follows 1 Insert the red temperature probe into the M VOHZ terminal and the black temperature probe into the COM terminal Set the rotary switch to C or F Place the temperature probe to the object being measured The measured value shows on the display Sh The Meter s LCD automatically displays the temperature value inside the Meter when there is no temperature probe connection 23 Model UT70B OPERATING MANUAL Measurement Operation 9 l DC or AC Current Measurement se
25. shape will be at the position indicated by the number 4 if the input is 40V a sign will appear on the left of the analogue display There is no analogue displaying value during the capacitance measurement Also when 4mF or 40mF range is selected a long measuring time is expected and the analogue display will show the capacitor s discharge process 29 Model UT70B OPERATING MANUAL Turning on the Display Backlight ZN Warning In order to avoid the hazard arising from mistaken readings in insufficient light or poor vision please use Backlight function Press 3 to turn on the display backlight and it will automatically off after about 15 seconds Press and hold X to keep the display backlight on The display backlight will last for about 15 seconds and then off automatically after releasing the button Full Icons Display If the Meter is turned on with HOLD being pressed on the LCD will display all the icons and maintain this mode until the LCD enters normal display mode when the HOLD is pressed again 30 Model UT70B OPERATING MANUAL Sleep Mode To preserve battery life the Meter automatically turns off if you do not turn the rotary switch or press any button for 30 minutes The buzzer beeps before turning off The Meter can be activated by turning the rotary switch or pressing any button it will display the last measurement value before it entered sleep mode However in the C or F mode and
26. t the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter F Capacitance Measurement see figure 8 black figure 8 A warning To avoid damage to the Meter or to the eguipment 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 discharged JAM The Meter s capacitance ranges are 4 000nF 40 00nF 400 0nF 4 000uF 40 00uF 400 0uF 4 000mF and 40 00mF To measure capacitance connect the Meter as follows 1 Insert the red test lead or the red test clip into the M VOHZ terminal and the black test lead or black test clip into the COM terminal Set the rotary switch to AF Connect the test leads or the test clips across with the object being measured The measured value shows on the display e Po When capacitance 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 21 Model UT70B OPERATING MANUAL Measurement Operation 7 G Frequency or Revolution Measurement see figure 9 black ESI figure 9 The measurement ranges are 4 000kHz 40 00kHz 400 0kHz 4 000MHz 40 00MHz and 400 0MHz To measure frequency connect the Meter as follows 1 Insert the
27. test is less than 400 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 19 Model UT70B OPERATING MANUAL Measurement Operation 5 E Testing Diode see figure 7 black ESSEEN figure 7 ZN 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 1 Insert the red test lead into the M VOHZz terminal and the black test lead into the COM terminal 2 Set the rotary switch to re 3 Connect the test leads across with the object being measured The measured value shows on the display 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 20 Model UT70B OPERATING MANUAL Measurement Operation 6 When diode testing has been completed disconnec
28. ture 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 high performance with full input protection and display backlight Model UT70B 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 1 piece 2 Test Lead 3 Test Clip 4 Point Contact Temperature Probe 9V Battery NEDA 1604 6F22 or 006P 5 1 piece installed 6 RS232C Interface Cable 1 piece 7 CD ROM Installation Guide amp Computer 1 piece Interface Software 8 Holster 1 piece 9 Tilt Stand 1 piece In the event you find any missing or damage please contact your dealer immediately Model UT70B OPERATING MANUAL Safety Information In this manual a Warning identifies conditions and actions that pose hazards to the user or may damage the Meter or the eguipment under test 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 classification of CAT
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