UNI-T UT81B Operating Manual Download

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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 UT81B

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

Page 2: ...l 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 a...

Page 3: ...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 Phy...

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 A Range Measurement 3 4 mA Range Measurement 3 5 10A Range Measurement 3 6 Resistance Measurement 3 7 Diode Test 3 8 Conti...

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...

Page 8: ...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 Alliga...

Page 9: ...st 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...

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 M...

Page 11: ...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...

Page 12: ...s 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 Tr...

Page 13: ...ture 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 mA A Input T...

Page 14: ...ope 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...

Page 15: ...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 contr...

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 bot...

Page 17: ...TER 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 S...

Page 18: ...de 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...

Page 19: ...orm 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...

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 wi...

Page 21: ...o 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 volta...

Page 22: ...he 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 t...

Page 23: ...o 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 co...

Page 24: ...sert the red test lead into the mA 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...

Page 25: ...sert the red test lead into the AmA 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 measur...

Page 26: ...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 meas...

Page 27: ...ll 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 W...

Page 28: ...ning 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...

Page 29: ...measuring low resistance the test leads can add 0 1 to 0 2 of error to resistance measurement To test the leads touch the probe tips together and read the resistance of the leads Take the reading obt...

Page 30: ...cuit 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 thr...

Page 31: ...s 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...

Page 32: ...t 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 me...

Page 33: ...isplay 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 correspondin...

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 d...

Page 35: ...ms 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 betw...

Page 36: ...ide 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 capacitan...

Page 37: ...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 tes...

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: ...ce 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...

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 fu...

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 co...

Page 42: ...tection voltage IEC 61010 CAT II 1000V CAT III 600V overvoltage and double insulation standard 0 5A 250V fast type fuse 5 20mm 10A 250V fast type fuse 5 20mm Maximum Voltage between any Terminal and G...

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...

Page 44: ...e 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...

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...

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 10M excluding Multimeter part 5 1pix 10...

Page 47: ...V 10mV 100mV 1V 0 8 8 0 1 8 1000V DC or AC Around 10M 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...

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 5 20mm 10A 250V fast type fuse 5 20mm Continuous measurem...

Page 49: ...e 5 20mm Continuous measurement 10 seconds and interval more than 15 minutes Range Resolution Accuracy Overload Protection 400 A 4000 A 40mA 400mA 4A 10A 0 1 A 1 A 10 A 100 A 1mA 10mA 1 5 8 2 8 2 5 5...

Page 50: ...around 2 When the LCD displays 1 10 period waveform the reading is valid otherwise the Meter displays 400 4k 40k 400k 4M 40M 250VDC or AC rms Range Resolution Accuracy Overload Protection E Resistanc...

Page 51: ...0 l The buzzer does not sound when the test resistance is 100 250V DC or AC 0 1 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 refere...

Page 52: ...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 otherw...

Page 53: ...52 Model UT81B OPERATING MANUAL This operating manual is subject to change without notice END...

Page 54: ...imited 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 Nanyan...

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

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