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RAGU 81D DIGITAL MULTIMETER

OPERATION MANUAL

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Summary of Contents for 81D

Page 1: ...RAGU 81D DIGITAL MULTIMETER OPERATION MANUAL...

Page 2: ...V Other Functions 12 VI Property 13 1 General Property 13 2 Technical Property 14 2 2 1 DCV 15 2 2 2 ACV True RMS 16 2 2 3 DCA 18 2 2 4 ACA True RMS 20 2 2 5 Resistance 23 2 2 6 Diode and Continuity T...

Page 3: ...ould be used to measure DC voltage AC voltage DC current AC current resistance temperature capacity frequency duty cycle diode and to make on and off test Meanwhile it is available for unit symbol dis...

Page 4: ...al tool in laboratory and factory as well as for radio fans and family Open package Inspection Open the package box and take out the meter check carefully if the following accessories are absent or da...

Page 5: ...ssion Prior to the operation of the instrument please read the safety considerations first 1 When DC voltage is higher than 30V AC voltage is higher than 25V current is higher than 10mA AC power line...

Page 6: ...safety standard When the line of the test lead is damaged it is necessary to replace another one of the same model or the same electrical specification 4 Don t use other unconfirmed or disapproved fus...

Page 7: ...acement the test lead must leave the measuring point and ensure there is no any signal at the input terminal 6 When the electrical measurement is made never let your body get in touch with the ground...

Page 8: ...or s safety if you take any voltage measurement that exceeds the limits The ultimate voltage value permitted for measurement is marked on the instrument panel Never take measurement or input the ultim...

Page 9: ...rofessional personnel who have had special training or gained approval can make it 11 During measurement the requirement of measurement function must be in accordance with LCD display Please be sure t...

Page 10: ...ely to ensure the measurement precision 13 It is not allowed to insert the test lead into the current terminal to measure voltage 14 Please don t change the circuits of the meter by yourself to preven...

Page 11: ...2 3 3 3 4 4 5 1 5 2 5 3 IV Instrument Panel Button Function Description 1 Instrument Model Number 2 LCD Display Display the measured data and unit 3 Function Button 3 1 SELECT function switch Press t...

Page 12: ...ous shift When it goes to the highest shift it goes back to the lowest shift automatically The procedure repeats again in the same order Press the RANGE button over 2 seconds it will exit from manual...

Page 13: ...the Hz Duty function Frequency duty cycle press this button to select frequency or duty cycle measurement mode 4 Function Range Selection Switch It could be used to change the measurement function and...

Page 14: ...he meter will automatically shut down enter sleeping mode to save power if function buttons and function range selection switch are not operated in 15 minutes In auto power off mode press any function...

Page 15: ...3999 3 3 4 counts automatic polarity display and unit display 1 3 Measuring Method Dual integral A D converter 1 4 Sampling Rage Approx 3 times sec 1 5 Over Range Indication Display OL 1 6 Low Battery...

Page 16: ...luding 2pcs 1 5V batteries 1 12 Accessories Instruction Manual 1 pc Holster 1 pc Outer packing box 1 pc 10A test leads 1 pair K Thermocouple and 1 5V batteries 2 pcs 2 Technical Property 2 1 Accuracy...

Page 17: ...the test leads contacted to the testing points The voltage and polarity of the point where the red test lead is contacted will be displayed on the screen Caution 1 Don t measure voltage over 600V Othe...

Page 18: ...100uV 4V 1mV 40V 10mV 400V 100mV 600V 1 0 4d 1V Input Impedance 400mV 40M 10M at other Ranges Overload Protection 600V DC or 600V AC Peak Value 2 2 2 ACV True RMS 1 Insert the black test lead into th...

Page 19: ...leads contacted to the testing points The voltage of the point where the red test lead is contacted will be displayed on the screen Caution 1 Don t measure voltage over 600V Otherwise it may cause da...

Page 20: ...1V Input Impedance 10M Overload Protection 600V DC or 600V AC Peak Value Frequency Response 50 200 Hz Display Average value response RMS of sine wave 2 2 3 DCA 1 Insert the black test lead into the CO...

Page 21: ...he tested current value and the current polarity of the point where the red one is contacted will be displayed on the screen simultaneously Caution 1 If OL is displayed on LCD it indicates the tested...

Page 22: ...10mA Max measurement voltage drop Full Range mA is 0 4V A is 100mV Max input current 10A less than 15 seconds Overload Protection 0 4A 250V restorable fuse 10A 250V fuse 2 2 4 ACA True RMS 1 Insert th...

Page 23: ...value and the current polarity of the point where the red one is contacted will be displayed on the screen simultaneously Caution 1 If OL is displayed on LCD it indicates the tested current value has...

Page 24: ...n 400uA 1 5 10d 0 1uA 4000uA 1uA 40mA 10uA 400mA 100uA 10A 2 5 15d 10mA Max measurement voltage drop Full Range mA is 0 4V A is 100mV Max input current 10A less than 15 seconds Overload Protection 0 4...

Page 25: ...se short circuit the test leads at first to test the wire resistance and then deduct it from the actual resistance Caution 1 If OL is displayed on LCD it indicates the tested resistance value has exce...

Page 26: ...ay OL 3 When measuring in line resistor be sure that the power is off and all capacitors are discharged completely Range Accuracy Resolution 400 0 8 5d 0 1 4k 0 8 4d 1 40k 10 400k 100 4M 1k 40M 1 2 10...

Page 27: ...rom the actual resistance 2 2 6 Diode and Continuity Test 1 Insert the black test lead to COM terminal and the red one to terminal The polarity of red test lead is 2 Rotate the Range to gear Press SEL...

Page 28: ...black one to the diode positive polarity OL symbol will be displayed on the screen 5 The complete diode testing includes forward and backward measurement if the result does not meet the above it means...

Page 29: ...Drop of Diode Forward DC Current is Approx 0 5mA Backward Voltage is Approx 1 5V Buzzer makes a long sound if resistance is less than 50 Open circuit voltage is Approx 0 5V Overload Protection 250V D...

Page 30: ...COM input terminals the screen will show capacitance parameter The relative value measurement could be conducted by pressing REL button Caution 1 Fully discharge the tested capacitor in case it damag...

Page 31: ...4nF 5 0 90 1 pF 40nF 4 5 8 10pF 400nF 100pF 4 F 1nF 40 F 10nF 100 F 5 0 8 100nF 1000 F 5 0 8 1 F Overload Protection 250V DC or AC Peak Value 2 2 8 Frequency F 1 Connect test leads and shielded cable...

Page 32: ...V it could show reading but excess vibration may appear 2 It is recommended to test weak signals by shielded cable under noisy circumstances 3 Press Hz DUTY button to choose the frequency or duty cycl...

Page 33: ...100kHz 100Hz 1MHz 1kHz 30MHz 10kHz 0 1 99 9 For your reference 0 1V Input Sensitivity 1VRMS Overload Protection 250V DC or AC Peak Value 2 2 9 Temperature 1 Rotate function switch to gear 2 Insert th...

Page 34: ...be tested Then you can read temperature from the screen and the data is in Centigrade Caution 1 When the input terminal is open circuit it will display the normal temperature 2 Don t change the tempe...

Page 35: ...75 5d 750 1 5 15d 1 Sensor K Type Thermocouple Nickel chromium nickel silicon banana plug CAUTION DO NOT INPUT VOLTAGE AT THIS RANGE VII Instrument Maintenance This is a precision instrument and the u...

Page 36: ...sive environment and strong magnetic field 3 Wipe the case with a damp cloth and detergent do not use abrasives and alcohol 4 If the instrument is not operated for a long time please take out the batt...

Page 37: ...hem with two new ones Although a 1 5V battery of any standard can be used but in order to extend the operation life alkaline batteries should be used 5 3 Close the battery door and secure the screw Pr...

Page 38: ...remove the test leads from the measuring points and switch off the meter VIII Fault Elimination If the instrument could not work properly please try the following tips to solve some general problems I...

Page 39: ...e battery This Instruction is subjected to change without any further notice The content of this Instruction is considered correct and in case readers find any errors and missing parts please contact...

Page 40: ...38 The function elaborated by this Instruction shall not be taken as the reasons for using the product for special purposes...

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