UNI-T UT81A Operating Manual Download Page 45

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Model UT81B: OPERATING MANUAL

Feature Summary

160 x 160 Monochrome

When it is under multimeter mode, the Meter automatically selects

best range

Beeper sounds for resistance readings 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 40M

Ω

0 to 100

0~10MHz

Function

DC Voltage

AC Voltage

Basic Accuracy

DC Current

AC Current

Resistance

Capacitance

Frequency

Summary of Contents for UT81A

Page 1: ...Model UT81B OPERATING MANUAL ...

Page 2: ...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 3: ...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 4: ...3 Model UT81B OPERATING MANUAL 50 51 Chapter Title Page Table of Contents H Frequency and Duty Cycle I Capacitance ...

Page 5: ...4 Model UT81B 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 6: ...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 7: ... digital 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 8MHz real time sample rate 40MS s with peak rate sampling process can catch up pulse industrial signal It can measure AC DC engine transducer c...

Page 8: ...u find any missing or damage please contact your dealer immediately 1 2 3 4 5 6 7 8 9 English Operating Manual USB interface cable CD ROM Installation Guide Computer Interface Software Test Lead Alligator Clip Power Adaptor 1 5V Batteries R6 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 1 Unpack...

Page 9: ...est A Note identifies the information that user should pay attention to Warning l l l 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 inspec...

Page 10: ... 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 11: ...t AC Measurement Continuity Test Diode Grounding Double Insulated Warning Refer to the Operating 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 ...

Page 12: ...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 13: ...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 14: ...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 15: ...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 16: ... the battery indicator appears A Scope Mode l The LCD top right part display RUN HLD REV l The LCD top right corner has battery icon to indicate when the battery is lower than 5V l Under scope mode both reading and waveform will be displayed 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...

Page 17: ...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 18: ...ode Press Range to switch between DC and AC measurement When the frequency and amplitude of a waveform is unknown press Auto l l 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 ...

Page 19: ...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 20: ... that 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 re...

Page 21: ...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 22: ...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 termi...

Page 23: ...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 24: ...nsert 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 25: ...sert 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 26: ...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 ...

Page 27: ...ill 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 measureme...

Page 28: ...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 29: ...n 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 stable r...

Page 30: ...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 31: ...y 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 connection vo...

Page 32: ...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 33: ... 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 and...

Page 34: ... 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 35: ...rms 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 l l l ...

Page 36: ...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 37: ...t 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 Met...

Page 38: ...37 Model UT81B OPERATING MANUAL Chapter 4 Using Software When using the Software please refer to the Installation Guide of the included CD ROM ...

Page 39: ...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 40: ...e 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 fixed firmly in ...

Page 41: ... 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 botto...

Page 42: ...tection voltage IEC 61010 CAT II 1000V CAT III 600V overvoltage and double insulation standard 0 5A 250V fast type fuse ø5 20mm 10A 250V fast type fuse ø5 20mm Maximum Voltage between any Terminal and Grounding Certification Compliances Fused Protection for mA input terminal Fused Protection for 10A input terminal ...

Page 43: ... Batteries or 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 Electromagne...

Page 44: ...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 45: ...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 46: ... 5 sec div 1 2 5 0 1 1pix Bandwidth Channel Coupling Voltage resolution Input Impedance Accuracy Maximum input voltage Voltage Sensitivity 8MHz Single DC 8 Bits 10MΩ excluding Multimeter part 5 1pix 1000Vp 200mV div 500V div 1 2 5 Horizontal Vertical Detailed Accuracy Specifications Accuracy of reading number of least significant digits guarantee for 1 year Operating temperature 18 o C 28 o C Rela...

Page 47: ...V 10mV 100mV 1V 0 8 8 0 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 Remarks l Frequency Response 40Hz 400Hz l Displays effective value of sine wave mean value response ...

Page 48: ...is around 2 When the LCD displays 1 10 period waveform the reading is valid otherwise the Meter displays C DC Current 0 5A 250V fast type fuse ø5 20mm 10A 250V fast type fuse ø5 20mm 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 49: ...se ø5 20mm 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 Remarks l Frequency Response 40Hz 400Hz l Displays effective value of sine wave mean value response ...

Page 50: ...nd 2 When the LCD displays 1 10 period waveform the reading is valid otherwise the Meter displays 400Ω 4kΩ 40kΩ 400kΩ 4MΩ 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 51: ...Ω l The buzzer does not sound when the test resistance is 100Ω 250V 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 Remarks l Input amplitude a as follows DC electric level is zero When 1MHz 300mV a 30Vrms When 1MHz 600mV a 5Vrms ...

Page 52: ...r of the display shows the waveform s RMS value for reference only When the LCD displays 1 10 period waveform cycle or the peak peak difference value is greater than 1 3 div the reading is valid otherwise the Meter displays 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 53: ...52 Model UT81B OPERATING MANUAL This operating manual is subject to change without notice END ...

Page 54: ...Limited Dong Fang Da Dao Bei Shan Dong Fang Industrial Development District Hu Men Town Dongguan City Guang Dong Province China Postal Code 523 925 Headquarters Uni Trend Group Limited 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 ...

Page 55: ...54 Model UT81B OPERATING MANUAL ...

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