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UNI-T UT81 Series, Operating Manual

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Model UT81C: OPERATING MANUAL

Figure 3-5. 10A Range Measurement

To measure AC 10A or DC 10A currents, set up
the Meter as Figure 3-5 and proceed as follows:

1. Insert the red test lead into the 

10A

 terminal and

    black test lead into the

 COM 

terminal.

2. Set the rotary switch to 

A

.

3. Connect the test lead in series with the return circuit
    to be tested.
4. The measured value shows on the display.
5. Press 

MODE

 button to toggle between Multimeter

    mode and Scope mode.
6. Press F1 to toggle between AC and DC current
    measurement.

Summary of Contents for UT81 Series

Page 1: ...P N 110401103423 ...

Page 2: ...Model UT81C OPERATING MANUAL ...

Page 3: ...al Electrical Symbols 2 Using The Testing Tool Reading the screen The Meter Structure Functional Buttons 3 Making Measurements A Scope Mode i Setting up the Sleep Mode Contrast Beep ii ACV DCV Hz ACV and DCA Range iii Trigger function iv Waveform data save and recall B Digital Multimeter Mode i Measuring Voltages ii Measuring Currents iii Measuring Resistance iv Testing Diodes v Testing for Contin...

Page 4: ...e Test Continuity Test vii Measuring Capacitance 4 Using Software 5 Maintenance The Test Tool A General Service B Replacing the Fuses C Replacing the Battery 6 Specifications Safety and Compliances Physical Specifications General Specifications Digital Multimeter General Specifications Scope Feature Summary Basic Specifications Digital Multimeter Basic Specifications Scope Detailed Accuracy Specif...

Page 5: ...3 Model UT81C OPERATING MANUAL 50 51 Chapter Title Page Table of Contents H Frequency and Duty Cycle I Capacitance ...

Page 6: ...4 Model UT81C OPERATING MANUAL 7 10 11 13 Table Title Page List of Tables 1 1 Unpacking Inspection 1 2 International Electrical Symbols 2 1 Reading the Screen 2 2 Functional Buttons ...

Page 7: ...ture 2 2 Functional Buttons 3 1 Waveform Display 3 2 Voltages Measurement 3 3 μA Range Measurement 3 4 mA Range Measurement 3 5 10A Range Measurement 3 6 Resistance Measurement 3 7 Diode Test 3 8 Continuity Test 3 9 Frequency Duty Cycle Measurement 3 10 Capacitance Measurement 5 1 Fuse Replacement 5 2 Battery Replacement ...

Page 8: ...ital control techique with both waveform and multimeter all in one Scope mode is a complete intelligent measurement system including signal input sampling data process auto search and waveform save and recall It has Chapter 1 Before You Start bandwidth UT81C 16MHz real time sample rate 80MS s with peak rate sampling process can catch up pulse industrial signal It can measure AC DC engine transduce...

Page 9: ...ny missing or damage please contact your dealer immediately 1 2 3 4 5 6 7 8 9 10 English Operating Manual USB interface cable CD ROM Installation Guide Computer Interface Software Test Lead Alligator Clip Power Adaptor 1 5V Batteries R6 Carrying bag Scope Probe available at extra cost BNC probe available at extra cost 1 piece 1 piece 1 piece 1 pair 1 piece 1 piece 4 pieces 1 piece 1 piece Table 1 ...

Page 10: ...r test A Note identifies the information that user should pay attention to Warning International electrical symbols used on the Meter and in this Operating Manual are explained on page 10 Rules For Safe Operation 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 t...

Page 11: ... check the Meter s fuses and turn off power to the circuit before l l l l l l l 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 When servicing the Meter use only the same model number or identical electrical specifications replacement parts ...

Page 12: ...g Manual Deficiency of Built In Battery Conforms to Standards of European Union Symbols used on the Meter and in this manual are explained in Table1 2 Table 1 2 International Electrical Symbols l Under the influence of Radiated Radio Frequency Electromagnetic Field phenomenon the captioned model have a 20 measurement error it will be back to normal when the interference is removed ...

Page 13: ...ys the menu that provides the following choices available Table 2 1 Reading the Screen Description Decrease a range Increase a time base Decrease a time base Waveform moves right Waveform moves left Trigger moves up Trigger moves down Trigger slope adjustment Auto trigger mode Normal trigger mode Single trigger mode Display Contrast Auto Off BK Light BEEP ENTER MOVE MOVE RANG Display RANG BASE BAS...

Page 14: ...cture The Meter Structure The Figure 2 1 shows the Meter structure 1 USB Terminals 2 LCD Display 3 Functional Buttons 4 Rotary Switch 5 Power adaptor Input Terminals 6 10A Input Terminal 7 mAμA Input Terminals 8 COM Input Terminal 9 Other Input Terminals ...

Page 15: ...cope mode press Trig button to change the trigger mode In multimeter mode Press Auto button to enter autoranging mode when measuring resistance voltage and current This button is invalid when measuring capacitance diode continuity buzzer and capacitance In scope mode Press Auto button to set the amplitude and time base to auto Buttons F1 F2 F3 and F4 Range Time Trig Auto Functional Buttons The but...

Page 16: ...h between waveform display scope mode and digital reading multimeter mode This button is only valid when under voltage frequency currents mode Press Set button to set the auto power off backlight contrast and beep Under scope mode press Save Cal to store and recall data Press Hold button to enter or exit hold mode ...

Page 17: ...se readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator appears Based on the working environment to set up sleep mode contrast beep Press Set button to set the auto power off display backlight contrast and beep Auto off Bk Light Contrast Beep F1 F2 F3 F4 F1 Set auto power off time Auto off 15 ENTER F1 F2 F3 F4 The time level i...

Page 18: ...NTER F1 F2 F3 F4 The contrast level from 0 to 31 Press F4 to confirm save and return Press functional buttons to exit the setting is kept but will not save The setting will be lost after power off F4 Set the beeps features it can only be used under resistance diode and continuity measurement Beep ON OFF ENTER F1 F2 F3 F4 F2 to turn the beep on F3 to turn the beep off F4 to confirm save and return ...

Page 19: ... Mode Press Range to switch between DC and AC measurement When the frequency and amplitude of a waveform is unknown press Auto When the amplitude is set to auto the amplitude indicator will be shown white text in black background When the amplitude is set to manual the amplitude indicator will be shown black text in white background When the time base is set to auto the time base indicator will be...

Page 20: ...form F3 go up range F4 go down a range The auto set feature will be off when changing the measurement mode Press Time button under scope mode the corresponding functional button Base Base Base Base F1 F2 F3 F4 F1 increase the number of periods F2 decrease the number of periods F3 trigger point move left F4 trigger point right move The auto set feature will be off when changing the measurement mode...

Page 21: ... location has data or not If you recall the location has no data the meter will appear error message you need to press HOLD button to continue measurement If you recall the location has data it will save the current setting and display the data the LCD top left shows REV to indicate recalling mode is on Press HOLD button to return to working mode and continue measurement You could continue recalli...

Page 22: ...to mA terminal Don t connect the BNC probe to the 10A terminal B Digital Multimeter Mode Warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than DC 1000V AC 750V although readings may be obtained To measure voltages set up the Meter as Figure 3 2 and do the following 1 Insert the red test lead into the V terminal and the black...

Page 23: ...t the right bottom of the LCD when it is on F3 select a range up F4 select a range down After changing the measurement mode the autoranging will be off automatically and the AUTO will be disappeared at the bottom left of the LCD When voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove testing leads away from the input ter...

Page 24: ...to the equipment under test check the Meter s fuses before measuring current Use proper terminals function and range for the measurement Never place the testing leads in parallel with any circuit or component when the leads are plugged into the current terminals Turn off power to the circuit before test leads are connected in series to the return circuit to be tested Warning ...

Page 25: ...sert the red test lead into the μmA terminal and black test lead into the COM terminal 2 Set the rotary switch to μA 3 Connect the test lead in series with the return circuit to be tested 4 The measured value shows on the display 5 Press MODE button to toggle between Multimeter mode and Scope mode 6 Press F1 to toggle between AC and DC current measurement ...

Page 26: ...ert the red test lead into the μAmA terminal and black test lead into the COM terminal 2 Set the rotary switch to mA 3 Connect the test lead in series with the return circuit to be tested 4 The measured value shows on the display 5 Press MODE button to toggle between Multimeter mode and Scope mode 6 Press F1 to toggle between AC and DC current measurement ...

Page 27: ... Insert the red test lead into the 10A terminal and black test lead into the COM terminal 2 Set the rotary switch to A 3 Connect the test lead in series with the return circuit to be tested 4 The measured value shows on the display 5 Press MODE button to toggle between Multimeter mode and Scope mode 6 Press F1 to toggle between AC and DC current measurement ...

Page 28: ...UTO will be disappeared at the bottom left of the LCD If the value to be measured is unknown use the maximum measurement position and reduce the range step by step until a satisfactory reading is obtained When the measured current is 5A continuous measurement is allowed When the measured current is between 5A 10A continuous measurement 10 seconds and interval more than 15 minutes When current meas...

Page 29: ...rning To avoid possible damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measuring resistance To measure resistance set up the Meter as shown in Figure 3 6 and follow the following procedure ...

Page 30: ... When measuring low resistance the test leads can add 0 1Ω to 0 2Ω of error to resistance measurement To test the leads touch the probe tips together and read the resistance of the leads Take the reading obtained to subtract the resistance of the leads to get the final reading For high resistance measurement 1MΩ or low resistance measurement 40Ω it is normal taking several seconds to obtain a stab...

Page 31: ...rcuit power and discharge all the high voltage capacitors before testing diodes Warning Use the diode test to check diodes transistors and other semiconductor devices The diode test sends a current through the semicondutor junction then measure the voltage drop across the junction A good silicon junction drops between 0 5V and 0 8V To test the diode out of a circuit set up the Meter as Figure 3 7 ...

Page 32: ...arity is The measured value shows on the display When measuring diode the corresponding functional buttons DIODE REL F1 F2 F1 toggle to continuity buzzer F2 relative mode Connect the test leads to the proper terminals as said above to avoid error display The LCD will display OL indicating either open circuit or wrong polarity connection The unit of diode is volt V displaying the positive connectio...

Page 33: ...pt to input voltage higher than 60V DC or 42V rms AC To avoid possible damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measuring continuity Warning To test for continuity set up the Meter as Figure 3 8 and do the following ...

Page 34: ...e display 5 The beeper comes on continuously for open conditions that is test resistance 10W 6 The beeper does not sound when the test resistance is 100W When measuring continuity buzzer the corresponding functional buttons CONTINUITY REL F1 F2 F1 toggle to resistance measurement mode F2 relative mode When continuity testing has been completed disconnect the connection between the testing leads an...

Page 35: ... lead into the Hz terminal and the black test lead into the COM terminal 2 Set the rotary switch to Hz 3 Connect the test leads across with the object being measured 4 The measured value shows on the display 5 Press MODE button to toggle between Multimeter mode and Scope mode 6 Press F1 to toggle between frequency and duty cycle measurement When measuring frequency and duty cycle the corresponding...

Page 36: ...30Vrms 1MHz 600 mV a 5Vrms It is normal to have few seconds run time when switch from other functions to these functions When Hz or duty cycle measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the test leads away from the input terminals ...

Page 37: ...side is discharged against the tested capacitor To avoid damage to the Meter or to the equipment under test disconnect circuit power and discharge all high voltage capacitors before measuring capacitance Warning To measure capacitance set up the Meter as shown in Figure 3 10 and proceed as follows ...

Page 38: ...test lead into the COM terminal Set the rotary switch to measurement mode the Meter may display a fixed reading which is a internal distributed capacitor value For testing less than 40nF capacitor the tested value must subtract the internal distributed capacitor value to maintain the accuracy To improve the accuracy press F2 REL with the test leads open to subtract the residual capacitance of the ...

Page 39: ...37 Model UT81C OPERATING MANUAL Chapter 4 Using Software When using the Software please refer to the Installation Guide of the included CD ROM ...

Page 40: ...nce test and service information Warning A General Service l l l l l 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 when it is not in use Take out the battery when it is not using for a long time Do not use or store t...

Page 41: ...minals Remove the screw from the battery compartment and separate the battery compartment from the case bottom Remove the three screws from the case bottom and separate the case bottom from the case top 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 ...

Page 42: ... the test leads are disconnected from the circuit being tested before opening the case bottom Follow Figure 5 2 and proceed as follows to replace the battery Turn the rotary switch to OFF and remove all connections from the terminals Remove the screw from the battery compartment and separate the battery compartment from the case bottom Replace with 4 pieces new 1 5V R6P batteries Rejoin the case b...

Page 43: ...ge input protection voltage IEC 61010 CAT II 1000V CAT III 600V overvoltage and double insulation standard F0 5AH 1000V ø6 32mm F10AH 1000V ø6 32mm Maximum Voltage between any Terminal and Grounding Certification Compliances Fused Protection for mA input terminal Fused Protection for 10A input terminal ...

Page 44: ... Power adaptor Check carefully about the working voltage of power adaptor before use l In a radio field of 1 V m below Overall Accuracy Specified Accuracy 5 of Range l In a radio field of 1 V m above No assigned accuracy is specified 200 x 100 x 48mm Approx 498g including battery Display LCD Operating Temperature Storage Temperature Relative Humidity Altitude Battery Type Electromagnetic Compatibi...

Page 45: ...ve polarity displays Display OL Display Range Polarity Overloading Battery Deficiency General Specifications Scope 160 x 160 Monochrome Auto set the Meter according to the tested signal size Display OL 10 screens and setups Optically isolated to ensure safety Allowing viewing at a convenient position and angle Display Auto setting Overloading Memory USB Tilt Stand ...

Page 46: ...below threshold Measure signal on or off time in Battery replaceable Display Autorange Continuity Duty Cycle Battery Access Door Basic Specifications Digital Multimeter Ranges Description 0 to 1000V 0 to 750V DC Voltage 0 8 AC Voltage 1 0 to 10A 0 to 10A 0 to 40MΩ 0 to 100μF 0 10MHz Function DC Voltage AC Voltage Basic Accuracy DC Current AC Current Resistance Capacitance Frequency ...

Page 47: ...c Specifications Scope Sampling rate Sampling rate Scale Updating rate Trigger types Timebase Range Timebase accuracy 20 pixels 5 Free Run Normal Single Shot UT81C 50ns div 5 sec div 1 2 5 Channel Coupling Voltage resolution Input Impedance Horizontal Vertical Detailed Accuracy Specifications Accuracy of reading number of least significant digits guarantee for 1 year Operating temperature 18 o C 2...

Page 48: ...curacy Overload Protection Input Impedance 100μV 1mV 10mV 100mV 1V 0 8 8 1 8 1000V DC or AC Around 10MΩ excluding waveform B AC Voltage 4V 40V 400V 750V Range Resolution Accuracy Overload Protection Input Impedance 1mV 10mV 100mV 1V 1 15 1 2 15 1000V DC or AC Around 10MΩ excluding waveform ...

Page 49: ...Current F0 5AH 1000V ø6 32mm F10AH 1000V ø6 32mm Continuous measurement 10 seconds and interval more than 15 minutes Range Resolution Accuracy Overload Protection 400μA 4000μA 40mA 400mA 4A 10A 0 1μA 1μA 10μA 100μA 1mA 10mA 1 8 1 2 8 1 5 8 ...

Page 50: ...Current F0 5AH 1000V ø6 32mm F10AH 1000V ø6 32mm Continuous measurement 10 seconds and interval more than 15 minutes Range Resolution Accuracy Overload Protection 400μA 4000μA 40mA 400mA 4A 10A 0 1μA 1μA 10μA 100μA 1mA 10mA 1 5 8 2 8 2 5 5 ...

Page 51: ... 40MΩ 250VDC or AC rms Range Resolution Accuracy Overload Protection E Resistance 0 1Ω 1Ω 10Ω 100Ω 1kΩ 10kΩ 1 2 5 1 5 1 2 5 1 5 5 Range Resolution Overload Protection Remarks F Diode Test Agood silicon junction drops between 0 5V and 0 8V 250V DC or AC 1mV ...

Page 52: ...t Test l The buzzer sounds when the test resistance is 10Ω l The buzzer does not sound when the test resistance is 100Ω 750V DC or AC 0 1Ω 10Hz 10MHz 0 1 99 9 250V DC or AC rms Range Resolution Accuracy Overload Protection 0 001Hz 0 1 0 1 3 Reading for reference only H Frequency and Duty Cycle ...

Page 53: ...51 Model UT81C OPERATING MANUAL 40nF 400nF 4μF 40μF 100μF 250V DC or AC rms Range Resolution Accuracy Overload Protection 10pF 100pF 1nF 10nF 100nF Under REL mode 3 10 3 8 4 8 I Capacitance ...

Page 54: ...52 Model UT81C OPERATING MANUAL This operating manual is subject to change without notice END ...

Page 55: ...53 Model UT81C OPERATING MANUAL ...

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