UNI-T UT70D, Operating Manual

Page 1: ... Operation AC Voltage Measurement DC Voltage Measurement DC Milivolt Measurement Measuring Resistance Conductance Capacitance and Continuity Testing Diodes DC or AC Current Measurement MAX MIN Recording Mode PEAK MAX MIN 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 Sl...

Page 2: ...rrent G AC Current H Frequency Duty Cycle Maintenance A General Service B Testing the Fuses C Replacing the Battery D Replacing the Fuses RS232C Serial Port A RS232C Port Cable B Setting of RS232C Serial Ports C System Requirements for Installing the UT70D Interface Program 37 37 37 38 38 38 39 39 40 42 42 43 44 45 46 46 46 47 ...

Page 3: ...ller 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...

Page 4: ...glish Operating Manual 1 piece 2 Test Lead 1 pair 3 Test Clip 1 piece 9V Battery NEDA 1604 6F22 or 006P installed 5 RS232C Interface Cable 1 piece CD ROM Installation Guide Computer Interface Software 7 Holster 1 piece 8 Tilt Stand 1 piece 1 piece 1 piece 4 6 In the event you find any missing or damage please contact your dealer immediately ...

Page 5: ...d 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 CE Version The Meter complies with the standards IEC61010 1 in pollution degree 2 ove...

Page 6: ...n 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...

Page 7: ... 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 ...

Page 8: ...The Meter Structure see figure 1 ...

Page 9: ...cated for information about the rotary switch positions Continuity measurement Capacitance measurement measurement AC or DC current measurement range from 0 1mA to 10 000A AC or DC current measurement range from 0 001mA to 800 00mA ...

Page 10: ...ing of maximum and minimum values Steps the display through the sequence of present high MAX low MIN and average AVG readings at any mode except at conductance mode In 1ms response time it steps through only MAX and MIN reading Power Up Option To select 1 second high accuracy response time press and hold down MAX MIN while turning the rotary switch to any function setting RANGE Manual range auto r...

Page 11: ...urning on the Meter to disable Sleep Mode function nF F DCAC REL Relative value measurement Relative percentage value measurement Press REL to enter or exit mode at any rotary switch position Press REL to enter or exit mode at any rotary switch position Hz Frequency measurement Press Hz once to enter frequency measurement in AC DC voltage or current measurement positions Duty cycle measurement Pre...

Page 12: ...Display Symbols 1 see figure 2 No Symbol Meaning 8 6 4 3 ...

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Page 14: ...y 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 Mete...

Page 15: ...econds 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 Press RANGE while turning on the power to enter 80 000 counts resolution except a...

Page 16: ...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 ...

Page 17: ...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 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 ...

Page 18: ...d The DC Millivolt ranges are 80 000mV 800 00mV To measure DC Voltage connect the Meter as follows In this range the Meter has an input impedance higher than 4000M 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 ...

Page 19: ...irm that the capacitor is discharged Resistance Conductance Measurement see figure 6 The resistance ranges are 800 00 8 0000k 80 000k 800 00k 8 0000M 80 000M To measure the resistance Conductance connect the Meter as follows 1 Insert the red test lead into the terminal and the black test lead into the COM terminal 2 Set the rotary switch to resistance measurement is default 3 Connect the test lead...

Page 20: ... will take several seconds to obtain a stable reading When measure resistance higher than 12 5M 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...

Page 21: ...ance of a circuit under test is less than 100 The LCD displays indicating the circuit being tested is open Press 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 circu...

Page 22: ... leads away from the input terminals of the Meter The Meter s capacitance ranges are 1 000nF 10 00nF 100 0nF 1 000 F 10 00 F and 100 0 F To measure capacitance connect the Meter as follows 1 Insert the red test lead into the terminal and the black test lead or test clip into the COM terminal 2 Set the rotary switch to and press button to select capacitance measurement mode 3 Connect the test leads...

Page 23: ...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 terminal and the black test lead into the COM terminal 2 Set the rotary switch to 3 For forward voltage drop readings on any semiconductor component place the terminal red test lead to anode COM terminal black test lead to cathode The measur...

Page 24: ...urrent terminals do not parallel them across any circuit Connect the test leads to the proper terminals as said above to avoid error display The LCD will display indicating open circuit for wrong polarity connection The unit of diode is Volt V displaying the positive connection voltage drop value Although it is possible to select frequency and duty cycle measurement mode these functions cannot be ...

Page 25: ...minal and the black test lead into the COM terminal Use the A terminal and A range if the current value to be tested is an unknown 3 Set the rotary switch to A or mA 4 The Meter defaults to DC current measurement mode To toggle between DC and AC current measurement function press 5 Break the current path to be tested Connect the red test lead to the more positive side of the break and the black te...

Page 26: ...he red test lead into the terminal and the black test lead into the COM terminal 2 Set the rotary switch to any measurement position of V V mV A mA 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...

Page 27: ... 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 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 sh...

Page 28: ... 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 ...

Page 29: ...he 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 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...

Page 30: ...me The pre set response time is 100ms Press to select 1ms response time in MAX MIN mode 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 Press MAX MIN to...

Page 31: ...his function can only be enabled when the Meter is under MAX MIN HOLD mode To enter PEAK MAX MIN mode 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 ...

Page 32: ...y switch to exit HOLD mode the Meter beeps 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 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 contin...

Page 33: ...witch to select the desired measurement function before selecting REL If measurement functions change manually after REL is selected the Meter exits the REL mode Press REL to enter 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 result Press REL again...

Page 34: ...34 Turning on the Display Backlight ...

Page 35: ...35 ...

Page 36: ...ter is suitable for indoor use 1A 250V fast type glass fuse 5x20mm 10A 250V fast type glass fuse 5x20mm CE Version IEC61010 CAT III 1000V CAT IV 600V overvoltage and double insulation standard UL UL Version UL 61010B 1 CAT II 1000V overvoltage double insulation standard ...

Page 37: ...00Hz Remarks Input impedance 10M Displays True RMS value Frequency response 40 400Hz When input signal 8mV When input signal 80mv 1000V DC AC rms scontinuous B DC Voltage 80 000mV 800 00mV 8 0000V 80 000V 800 00V 1000 0V 1 V 10 V 100 V 1mV 10mV 100mV 0 05 40 0 05 20 0 05 20 0 05 10 Remarks At 80 00mV 800 00mV Range Input impedance 4000M At 8 0000V 1000 0V Range Input impedance 10M ...

Page 38: ...est 0 01 Remarks Continuity Test Range Buzzer beeps continuously Open circuit voltage approximate 0 7V At 800 00 80 000M Range Open circuit voltage approximate 0 7V Conductance Test 80 000nS 80nS 12 5M D Capacitance 1 000nF 1pF 10 00nF 10pF 100 0nF 100pF 1 000 F 1nF 10 00 F 10nF 100 0 F 100nF At the RELmode 600Vp E Diodes Test Range Resolution Overload Protection Diode 1mV 600 Vp ...

Page 39: ... 40 0 5 40 0 8 40 Remarks At 8A 10A Range For continuous measurement 10 seconds and interval time between 2 measurements greater than 15 minutes G AC Current Remarks At 8A 10A Range For continuous measurement 10 seconds and interval time between 2 measurement greater than 15 minutes 1A 250V fast type glass fuse 5x20mm 10A 250V fast type glass fuse 5x20mm 1A 250V fast type glass fuse 5x20mm 10A 250...

Page 40: ...40 4 Frequency response 40Hz 400Hz Displays True RMS value 600Vp 2 6 600Vp 6 1A 250V fast type glass fuse 5x20mm 10A 250V fast type glass fuse 5x20mm ...

Page 41: ...41 5 Duty Cycle 1 99 600Vp ...

Page 42: ...lectrical 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 lon...

Page 43: ...43 MAINTENANCE 2 ...

Page 44: ...44 MAINTENANCE 3 ...

Page 45: ...om 4 Remove the 4 screws fixing the PCB on the input terminals gently take apart the PCB and reverse it 5 Remove the fuse by gently prying one end loose then take out the fuse from its bracket 6 Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket Fuse1 Fuse2 7 Rejoin the PCB and the case top and reinstall the 4 s...

Page 46: ...46 B Setting of RS232C Serial Ports see figure 15 ...

Page 47: ...onitor Microsoft Windows 95 or above At least 16MB 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 Installation Guide Computer Interface Software for installing and operating instructions of the UT70DInterface Program END This operating manual is subject to c...

Page 48: ...ess 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 ...