ut81b

Model UT81BOPERATING MANUAL

Chapter Title Page66788101111121315151517191920202227293133

Model UT81B: OPERATING MANUAL

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Table of Contents

1 Before You Start Overview Unpacking Inspection Safety Information Rules For Safe Operation International 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 Continuity vi. Measuring Frequency / Duty Cycle

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35373838394041414243434444454546464748494950

Chapter Title PageTable of Contents

A.B.C.D.E.F.G.

DC VoltageAC VoltageDC CurrentAC CurrentResistanceDiode TestContinuity Test

vii. Measuring Capacitance4 Using Software5 Maintenance The Test Tool A. General Service B. Replacing the Fuses C. Replacing the Battery6 Specifications

Safety and Compliances Physical Specifications General Specifications (Digital Multimeter) General Specifications (Scope) Feature Summary Basic Specifications (Digital Multimeter) Basic Specifications (Scope) Detailed Accuracy Specifications

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5051

Chapter Title PageTable of Contents

H. Frequency and Duty Cycle % I. Capacitance

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7101113

Table Title PageList of Tables

1-1 Unpacking Inspection1-2 International Electrical Symbols2-1 Reading the Screen2-2 Functional Buttons

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1213172123242527293133353940

Figure Title PageList of Tables

2-1 Meter Structure2-2 Functional Buttons3-1 Waveform Display3-2 Voltages Measurement3-3 µA Range Measurement3-4 mA Range Measurement3-5 10A Range Measurement3-6 Resistance Measurement3-7 Diode Test3-8 Continuity Test3-9 Frequency / Duty Cycle Measurement3-10 Capacitance Measurement5-1 Fuse Replacement5-2 Battery Replacement

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OverviewThis Operating Manual covers information on safetyand cautions. Please read the relevant informationcarefully and observe all the Warnings and Notesstrictly.

WarningTo avoid electric shock or personal injury, read the“Safety Information” and “Rules for Safe Operation”carefully before using the Meter.

Scope Digital Multimeter UT81B (hereafter referred toas “the Meter”) is a 3999 counts and 3 3/4 digits adoptingdigital control techique with both waveform andmultimeter all in one.

Scope mode is a complete intelligent measurementsystem including signal input, sampling, data process,auto search and waveform save and recall. It has

Chapter 1Before You Start

bandwidth 8MHz, real-time sample rate 40MS/s withpeak rate sampling process can catch up pulse industrialsignal. It can measure AC/DC engine, transducer,circuit, control, UPS and industrial equipments. It is anideal tools in professional repairing industries.

Digital Multimeter mode can measure AC voltage andcurrent, DC voltage and current, Resistance,Capacitance, Frequency, Duty Cycle, Diodes andContinuity.

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Item Description Qty


Unpacking Inspection

Open the package case and take out the Meter. Check the items shown on Table 1-1 carefully to see any missingor damaged part:

In the event you 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. Unpacking Inspection

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Safety Information

This Meter complies with the standards IEC61010 safetymeasurement requirement: in pollution degree 2,overvoltage category (CAT. II 1000V, CAT.III 600V) anddouble insulation.

CAT.II: Local level, appliance, PORTABLE EQUIPMENTetc., with smaller transient overvoltages than CAT. IIICAT. III: Distribution level, fixed installation, with smallertransient overvoltage than CAT. IV

Use the Meter only as specified in this operating manual,otherwise the protection provided by the Meter may beimpaired.

In this manual, a Warning identifies conditions andactions that may pose hazards to the user, or maydamage the Meter or the equipment under test.

A Note identifies the information that user should payattention to.

Warning

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International electrical symbols used on the Meter andin 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 theequipment under test, adhere to the following rules:

Before using the Meter inspect the case. Do notuse the Meter if it is damaged or the case (orpart of the case) is removed. Look for cracksor missing plastic. Pay attention to the insulationaround the connectors.Inspect the test leads for damaged insulation orexposed metal. Check the test leads forcontinuity. Replace damaged test leads withidentical model number or electricalspecifications before using the Meter.Do not apply more than the 1000V rms betweenany terminal and grounding to avoid electric

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shock or damages to the Meter.The rotary switch should be placed in the rightposition and no any changeover of range shallbe made during measurement is conducted toprevent damage of the Meter.When the Meter working at an effective voltageover 60V in DC or 42V rms in AC, special careshould be taken for there is danger of electricshock.Use the proper terminals, function, and rangefor your measurements.Do not use or store the Meter in an environmentof high temperature, humidity, explosive,inflammable and strong magnetic field. Theperformance of the Meter may deteriorate afterdampened.When using the test leads, keep your fingersbehind the finger guards.Disconnect circuit power and discharge all high-voltage capacitors before testing resistance,continuity, diodes.Before measuring current, check the Meter’sfuses and turn off power to the circuit before

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connecting the Meter to the circuit.Replace the battery as soon as the batteryindicator appears. With a low battery, theMeter might produce false readings that can leadto electric shock and personal injury.When servicing the Meter, use only the samemodel number or identical electricalspecifications replacement parts.The internal circuit of the Meter shall not bealtered at will to avoid damage of the Meter andany accident.Soft cloth and mild detergent should be used toclean the surface of the Meter when servicing.No abrasive and solvent should be used toprevent the surface of the Meter from corrosion,damage and accident.The Meter is suitable for indoor use.Turn the Meter off when it is not in us e and takeout the battery when not using for a long time.Constantly check the battery as it may leak whenit has been using for some time, replace thebattery as soon as leaking appears. A leakingbattery will damage the Meter.

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International Electrical Symbols

AC or DC

DC Measurement

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 areexplained in Table1-2.

Table 1-2. International Electrical Symbols

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Chapter 2Using the Testing Tool

Reading the Screen

DescriptionThe degree of contrastSleep mode timeDisplay backlightBeeper on and offConfirmIncreaseDecreaseWaveform moves upWaveform moves downIncrease a range

The screen displays the menu that provides the followingchoices available:

Table 2-1. Reading the ScreenDescriptionDecrease a rangeIncrease a time baseDecrease a time baseWaveform moves rightWaveform moves leftTrigger moves upTrigger moves downTrigger slope adjustmentAuto trigger modeNormal trigger modeSingle trigger mode

DisplayContrastAuto OffBK LightBEEPENTER

MOVE MOVE RANG

DisplayRANGBASE BASE BASE >BASE <TRIG TRIG SLOPAUTONORMSHOT

Table 2-1. Reading the Screen

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Figure 2-1. Meter Structure

The Meter StructureThe Figure 2-1 shows the Meter structure.

1. USB Terminals2. LCD Display3. Functional Buttons4. Rotary Switch5. Power adaptor Input Terminals6. 10A Input Terminal7. mAµA Input Terminals8. COM Input Terminal9. Other Input Terminals

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Figure 2-2. Functional Buttons

Table 2-2. Functional Buttons

DescriptionSoftware functional buttons, detailsplease refer to the below.Under scope mode, Press Rangebutton to switch between DC and ACmeasurementUnder scope mode, press Time buttonto set the X-axis of time base.Under scope mode, press Trig buttonto change the trigger mode.In multimeter mode: Press Auto buttonto enter autoranging mode whenmeasuring resistance, voltage andcurrent. This button is invalid whenmeasuring capacitance, diode, continuitybuzzer and capacitance.In scope mode: Press Auto button toset the amplitude and time base to auto.

ButtonsF1, F2,F3 and F4Range

Time

Trig

Auto

Functional ButtonsThe buttons activate features that augment the functionselected with the rotary switch. The buttons are shownin Table 2-2.

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Table 2-2. Functional Buttons

ButtonsMode

Set

Save/Call

Hold

DescriptionTo switch between waveform display(scope mode) and digital reading(multimeter mode). This button is onlyvalid when under voltage, frequency,currents mode.Press Set button to set the auto poweroff, backlight, contrast and beepUnder scope mode, press Save/Cal tostore and recall data.Press Hold button to enter or exit holdmode.

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Chapter 3Making Measurement

IntroductionChapter 3 explains how to make measurements.

You could turn the Meter off by turning to OFF positionor set up the sleep mode from 1-30 minutes. Pleasemust ensure the Meter is not under sleep mode if youturn the Meter on but without display.

To avoid false readings, which could lead to possibleelectric shock or personal injury, replace the battery as

soon as the battery indicator “ ” appears.

A. Scope Model The LCD top right part display: RUN, HLD, REVl 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 sleepmode, contrast, beepPress Set button to set the auto power off, displaybacklight, contrast and beepAuto off Bk Light Contrast Beep F1 F2 F3 F4

F1: Set auto power off timeAuto off 15 ENTER F1 F2 F3 F4The time level is from OFF, 1 to 30 minutes. Press F4to confirm, save and return. Press functional button toexit and the setting remains unchanged.

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F2: Set the Display BacklightBK Light 15 ENTERF1 F2 F3 F4The brightness level from 0 to 31. Press F4 toconfirm, save and return. Press functional buttonsto exit, the setting is kept, but will not save. Thesetting will be lost after power off.

F3: Set the LCD contrastContrast 15 ENTER F1 F2 F3 F4The 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 willbe lost after power off.

F4: Set the beeps features, it can only be used underresistance, diode and continuity measurement.Beep ON OFF ENTER F1 F2 F3 F4

F2 : to turn the beep onF3 : to turn the beep offF4 : to confirm , save and return

Press functional buttons to exit, the setting is kept, butwill not save. The setting will be lost after power off.

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Figure 3-1. Waveform Display

Turn the rotary switch to ACV, DCV, Hz, ACA or DCArange, the Meter displays digital reading (Multimetermode). Press Mode to switch to waveform display(scope mode) as below Figure 4. When entering scopemode, time base is auto trace, the amplitude is manualset, you may need to re-set them. You could set thetrigger level as well if it is needed. Details ofmeasurement operation of ACV, DC, Hz, ACA or DCAcan be seen from B. Digital Multimeter Mode:

Press Range to switch between DC and ACmeasurement.When the frequency and amplitude of a waveformis unknown, press Auto :

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When the amplitude is set to auto, the amplitudeindicator will be shown white text in blackbackground. When the amplitude is set to manual,the amplitude indicator will be shown black textin white background.When the time base is set to auto, the time baseindicator will be shown white text in blackbackground. When the time base is set to manualtrace, the time base indicator will be shown blacktext in white background.When the time base is between 20ms - 100ns, itis possible to set the auto. When the time baseis between 50ms - 5s, the auto feature will be invalid.

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l Y-axis adjustment: Press Range button under scopemode, the corresponding functional button:Move Move Rang Rang F1 F2 F3 F4

F1: move up the waveformF2: move down the waveformF3: go up rangeF4: go down a range

The auto set feature will be off when changing themeasurement mode

Press Time button under scope mode, thecorresponding functional button:Base Base Base < Base > F1 F2 F3 F4

F1: increase the number of periodsF2: decrease the number of periods.F3: trigger point move leftF4: trigger point right move

The auto set feature will be off when changing themeasurement mode.

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Press Trig button under scope mode, thecorresponding function buttons:Trig Trig Auto/Norm/Shot Slop Rrise/Fall F1 F2 F3 F4

F1: move the trigger level upF2: move the trigger level downF3: select the trigger mode: auto, normal or singleF4: slope adjustment: rise or fall

iv. Waveform data save and recallPress Save/Call button under scope mode, thecorresponding functional buttons:Save/Call 1 Enter F1 F2 F3 F4

F1: save or recallF2 and F3: select location (location from 0-9, total

10 location)F4: confirm

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When saving the data, it will overwrite the currentdata in the location no matter that location has dataor not.If you recall the location has no data, the meter willappear error message, you need to press HOLDbutton to continue measurement,If you recall the location has data, it will save thecurrent setting and display the data, the LCD top leftshows REV to indicate recalling mode is on. PressHOLD button to return to working mode and continuemeasurement. You could continue recalling underrecall mode or save the data.Recall mode can be used under any scope mode.For example, it is possible to recall the waveform ordata saved from voltage or frequency mode whenthe meter is under current measurement mode.Recall mode can be worked under any waveformmode. For example: the Meter is at current modebut recalling the waveform or data which are savedunder voltage or frequency mode. The Meter must

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be returned to working mode to carry out measurement.

In order to have more accurate waveform, user canbuy an optional BNC probe and scope probe to decreasesignal attenuates. The scope probe directly connectto the BNC probe.

When measuring voltage and frequency signal, connectthe BNC black probe to the COM input terminal andthe red probe to the voltage terminal.

When measuring current signal, connect BNC blackprobe to the COM terminal and the red probe to mAterminal.

Don’t connect the BNC probe to the 10A terminal.

B. Digital Multimeter Mode

WarningTo avoid harms to you or damages to the Meterfrom electric shock, please do not attempt tomeasure voltages higher than DC 1000V, AC750V, 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 test lead into the COM terminal.2. Set the rotary switch to V .3. Connect 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 AC and DC voltage measurement.

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Figure 3-2. Voltages Measurement

When measuring voltage, the corresponding functionalbuttonsAC / DC REL Rang Rang F1 F2 F3 F4

F1: toggle between AC or DCF2: relative mode (REL will be displayed at the right bottom of the LCD when it is on)F3: select a range upF4: select a range down

After changing the measurement mode, theautoranging will be off automatically and the AUTOwill be disappeared at the bottom left of the LCD.When voltage measurement has been completed,disconnect the connection between the testingleads and the circuit under test and remove testingleads away from the input terminals of the Meter.

Note:

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If the fuse burns out during measurement, the Metermay be damaged or the operator himself may behurt.

To avoid possible damage to the Meter or to theequipment under test, check the Meter’s fusesbefore measuring current. Use proper terminals,function, and range for the measurement. Neverplace the testing leads in parallel with any circuitor component when the leads are plugged into thecurrent terminals.

Turn off power to the circuit before test leads areconnected in series to the return circuit to be tested.

Warning

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Figure 3-3. µA Range Measurement

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To measure ACµA or DCµA currents, set up theMeter as Figure 3-3 and proceed as follows:

1. Insert 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.

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Figure 3-4. mA Range Measurement

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To measure ACmA or DcmA currents, set up theMeter as Figure 3-4 and proceed as follows:

1. Insert 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.

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Figure 3-5. 10A Range Measurement

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To measure AC 10A or DC 10A currents, set upthe 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.

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NoteWhen measuring current, the corresponding functionalbuttons:

AC / DC REL Rang Rang F1 F2 F3 F4

F1: toggle between AC or DCF2: relative mode (REL will be displayed at the right bottom of the LCD when it is on)F3: select a range upF4: select a range down

After changing the measurement mode, theautoranging will be off automatically and the AUTOwill be disappeared at the bottom left of the LCD.If the value to be measured is unknown, use themaximum measurement position and reduce therange step by step until a satisfactory reading isobtained.When the measured current is 5A, continuousmeasurement is allowed.When the measured current is between 5A-10A,continuous measurement 10 seconds and intervalmore than 15 minutes.When current measurement has been completed,disconnect the connection between the testing leadsand the circuit under test and remove testing leadsaway from the input terminals of the Meter.

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Figure 3-6. Resistance Measurement

WarningTo avoid possible damages to the Meter or to thedevices under test, disconnect circuit power anddischarge all the high-voltage capacitors beforemeasuring resistance.

To measure resistance, set up the Meter as shown inFigure 3-6 and follow the following procedure:

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Ω

Note1. Insert the red test lead into the Ω terminal and the black test lead into the COM terminal.2. Set the rotary switch to3. Connect the test leads across with the object being measured.4. The measured value shows on the display.

When measuring resistance, the correspondingfunctional buttons:RES REL Rang Rang F1 F2 F3 F4

F1: toggle to diode modeF2: relative modeF3: select to a range upF4: select to a range down

When measuring low resistance, the test leads canadd 0.1Ω to 0.2Ω of error to resistance measurement.To test the leads, touch the probe tips together andread the resistance of the leads. Take the readingobtained to subtract the resistance of the leads toget the final reading.For high-resistance measurement (>1MΩ) or lowresistance measurement (<40Ω), it is normal takingseveral seconds to obtain a stable reading.The LCD displays “OL” indicating open-circuit withoutinput.When resistance measurement has been completed,disconnect the connection between the testing leadsand the circuit under test and remove testing leadsaway from the input terminals.

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Figure 3-7. Diode Test

To avoid harms to you, please do not attempt toinput voltages higher than 60V DC or 42V rms AC.

To avoid damages to the Meter or to the devicesunder test, disconnect circuit power and dischargeall the high-voltage capacitors before testing diodes.

Warning

Use the diode test to check diodes, transistors, andother semiconductor devices. The diode test sends acurrent through the semicondutor junction, then measurethe voltage drop across the junction. A good siliconjunction drops between 0.5V and 0.8V

To test the diode out of a circuit, set up the Meter asFigure 3-7 and proceed as follows:

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Ω

Note1. Insert the red test lead into the Ω 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 red test lead on the component’s anode and place the black test lead on the component’s cathode. The red test lead polarity is “+” while the black test lead polarity is “— “. The measured value shows on the display.

When measuring diode, the corresponding functionalbuttons:DIODE REL

F1 F2F1: toggle to continuity buzzerF2: relative mode

Connect the test leads to the proper terminals assaid above to avoid error display.The LCD will display OL indicating either opencircuit or wrong polarity connection.The unit of diode is volt (V), displaying the positive-connection voltage-drop value.When diode testing has been completed, disconnectthe connection between the testing leads and thecircuit under test and remove the test leads awayfrom the input terminals.

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Figure 3-8. Continuity Test

To avoid harms to you, please do not attempt toinput voltage higher than 60V DC or 42V rms AC.

To avoid possible damages to the Meter or to thedevices under test, disconnect circuit power anddischarge all the high-voltage capacitors beforemeasuring continuity.

Warning

To test for continuity, set up the Meter as Figure 3-8and do the following:

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Ω

Note1. Insert the red test lead into the W terminal and the black test lead into the COM terminal.2. Set the rotary switch to .3. Connect the test leads across with the object being tested.4. The tested circuit overload resistance value shows on the 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 correspondingfunctional buttons:CONTINUITY REL

F1 F2

F1: toggle to resistance measurement modeF2: relative mode

When continuity testing has been completed,disconnect the connection between the testing leadsand the circuit under test and remove the test leadsaway from the input terminals.

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Figure 3-9. Measuring Frequency / Duty Cycle

To avoid harms to you, please do not attempt toinput voltage higher than 42V rms.

Warning

To measure frequency and duty cycle, connect theMeter as Figure 3-9 and do the following:

1. Insert the red test 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, thecorresponding functional buttons:Freq/Duty

F1

F1: toggle between frequency and duty cycle

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Note

The requirement of Input amplitude “a” is as follows:When 1MHz: 300 mV a 30Vrms;

1MHz: 600 mV a 5VrmsIt is normal to have few seconds run time whenswitch from other functions to these functions.When Hz or duty cycle measurement has beencompleted, disconnect the connection between thetesting leads and the circuit under test and removethe test leads away from the input terminals.

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Figure 3-10. Measuring Capacitance

To ensure accuracy, the Meter inside is dischargedagainst the tested capacitor

To avoid damage to the Meter or to the equipmentunder test, disconnect circuit power and dischargeall high-voltage capacitors before measuringcapacitance.

Warning

To measure capacitance, set up the Meter as shown inFigure 3-10 and proceed as follows:

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Capacitors larger than 10 F take longer time.If the tested capacitor has polarity, connect the redtest lead to positive side and black test lead tonegative side.When capacitance measurement has beencompleted, disconnect the connection between thetesting leads and the circuit under test and removethe test leads away from the input terminals of theMeter.

1.

2.

3.

4.

Insert the red test lead into theterminal and theblack test lead into the COM terminal.Set the rotary switch to measurement mode, theMeter may display a fixed reading which is a internaldistributed capacitor value. For testing less than40nF capacitor, the tested value must subtract theinternal distributed capacitor value to maintain theaccuracy.To improve the accuracy, press F2 REL with thetest leads open to subtract the residual capacitanceof the Meter and the test leads.It is recommended to use as short as test leadcarrying out measurement to reduce the effect ofinternal distributed capacitor.

When measuring capacitance, the correspondingfunctional buttons:Capacity REL

F1 F2

F2: relative mode

Note

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Chapter 4Using Software

When using the Software, please refer to the Installation Guide of the included CD-ROM.

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Chapter 5 Maintaining The Test Tool

This chapter provides basic maintenance informationincluding battery and fuse replacement instruction.

Do not attempt to repair or service your Meterunless you are qualified to do so and have therelevant calibration, performance test, and serviceinformation.

Warning

A. General Servicel

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Periodically wipe the case with a damp cloth andmild detergent. Do not use abrasives or solvents.To clean the terminals with cotton bar with detergent,as dirt or moisture in the terminals can affectreadings.Turn the Meter to OFF when it is not in use.Take out the battery when it is not using for a longtime.Do not use or store the Meter in a place of humidity,

high temperature, explosive, inflammable and strongmagnetic field.

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1.Remove the battery compartment

2.Remove the case bottom

3.Install fuses with correct type and specification

Figure 5-1. Fuse Replacement

B. Replacing the Fuses

To avoid electrical shock or arc blast, or personalinjury or damage to the Meter, use specified fusesONLY in accordance with the following procedure.

Warning

Follow Figure 5-1 and proceed as follows to replacethe Meter’s fuse:

Turn the rotary switch to OFF and remove allconnections from the terminals.Remove the screw from the battery compartment,and separate the battery compartment from the casebottom.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 identicaltype and specification as follows and make sure thefuse is fixed firmly in the bracket.Fuse 1: 0.5A, 250V, fast type fuse, ø5 x 20mmFuse 2: 10A, 250V, fast type fuse, ø5 x 20mmRejoin the case bottom and case top, batterycompartment and case bottom, and install the 5screws.

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Replacement of the fuses is seldom required. Burningof a fuse always results from improper operation.

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Figure 5-2. Battery Replacement

C. Replacing the Battery Warning

To avoid false readings, which could lead to possibleelectric shock or personal injury, replace the batteryas soon as the battery indicator “ ” appears.

Make sure the test leads are disconnected from thecircuit being tested before opening the case bottom.

Follow Figure 5-2 and proceed as follows to replacethe battery:

Turn the rotary switch to OFF and remove allconnections from the terminals.Remove the screw from the battery compartment,and separate the battery compartment from the casebottom.Replace with 4 pieces new 1.5V (R6P) batteries.Rejoin the case bottom and battery compartment,and reinstall the screw.

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Chapter 6Specifications

Safety and Compliances

Refer to different range input protection voltage

IEC 61010 CAT. II 1000V, CAT.III 600V overvoltageand double insulation standard0.5A, 250V, fast type fuse, ø5×20mm10A , 250V,fast type fuse, ø5×20mm

Maximum Voltage between any Terminal andGroundingCertificationCompliances

Fused Protection for mA input terminal: Fused Protection for 10A input terminal:

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Physical Specifications

Digital: 3999 counts on display ; updates 2-3 times / second.0oC~40oC (32oF~104oF)-10oC~50oC (14oF~122oF)

75% @ 0oC~40oC; 0% @ -10oC~50oC.

Operating: 2000m;Storage: 10000m.1.5V (R6) x 4 Batteries or Power adaptor. Check carefully about theworking voltage of power adaptor before use.l In a radio field of 1 V/m below: Overall Accuracy = Specified Accuracy + 5% of Rangel 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 TemperatureStorage TemperatureRelative Humidity

Altitude

Battery Type

Electromagnetic Compatibility

Dimensions (H x W x L)Weight

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General Specifications ( Digital Multimeter)

When it is under Multimeter mode, you could select either auto ormanual ranging.Auto, negative polarity displays “-“Display OLDisplay

Range

PolarityOverloadingBattery Deficiency

General Specifications (Scope)

160 x 160 MonochromeAuto set the Meter according to the tested signal sizeDisplay OL10 screens and setupsOptically isolated to ensure safetyAllowing viewing at a convenient position and angle.

DisplayAuto settingOverloadingMemoryUSBTilt Stand

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Feature Summary

160 x 160 MonochromeWhen it is under multimeter mode, the Meter automatically selectsbest rangeBeeper sounds for resistance readings below threshold.Measure signal on or off time in %.Battery replaceable.

DisplayAutorange

ContinuityDuty CycleBattery Access Door

Basic Specifications (Digital Multimeter)

Ranges / Description0 to 1000V0 to 750VDC Voltage: 0.8%AC Voltage: 1%0 to 10A0 to 10A0 to 40MΩ0 to 100µF0~10MHz

FunctionDC VoltageAC VoltageBasic Accuracy

DC CurrentAC CurrentResistanceCapacitanceFrequency

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Basic Specifications (Scope)

Sampling rateSampling rate / ScaleUpdating rateTrigger types

Timebase Range

Timebase accuracy

40M per second20 pixels>5Free Run / Normal /Single Shot100ns/div~5 sec /div(1-2-5)

(0.1% + 1pix)

BandwidthChannelCouplingVoltage resolution

Input Impedance

AccuracyMaximum input voltageVoltage Sensitivity

8MHzSingleDC8 Bits

10MΩ (excluding Multimeter part)

(5%+1pix)1000Vp-[200mV/div~500V/div (1-2-5)

Horizontal Vertical

Detailed Accuracy SpecificationsAccuracy: ([% of reading] + [number of least significant digits), guarantee for 1 year.Operating temperature: 18oC~28oCRelative humidity: <75%RH

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A. DC Voltage

400mV4V40V400V1000V

Range Resolution Accuracy Overload Protection Input Impedance

100µV1mV10mV100mV1V

(0.8%+8)

(0.1%+8)

1000V DC or ACAround 10MΩ(excluding waveform)

B. AC Voltage

4V40V400V750V

Range Resolution Accuracy Overload Protection Input Impedance

1mV10mV100mV1V

(1%+15)

(1.2%+15)

1000V DC or AC Around 10MΩ(excluding waveform)

Remarks:l Frequency Response: 40Hz ~ 400Hzl Displays effective value of sine wave (mean value response).

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l The specification is same as Bi Under Multimeter mode.l On the top right corner of the display shows the accuracy of the frequency which 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 secondsand interval more than 15 minutes.)

Range Resolution Accuracy Overload Protection

400µA4000µA40mA400mA4A10A

0.1µA1µA10µA100µA1mA10mA

(1%+8)

(1.2%+8)

(1.5%+8)

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D. AC Current

0.5A, 250V, fast type fuse, ø5×20mm

10A, 250V, fast type fuse, ø5×20mm(Continuous measurement 10 secondsand interval more than 15 minutes.)


400µA4000µA40mA400mA4A10A

0.1µA1µA10µA100µA1mA10mA

(1.5%+8)

(2%+8)

(2.5%+5)

Remarks:l Frequency Response: 40Hz~400Hz.l Displays effective value of sine wave (mean value response).

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l The specification is same as Di Under Multimeter mode. On the top right corner of the display shows the accuracy of the frequency which is around 2%. When the LCD displays 1-10 period waveform, the reading is valid, otherwise the Meter displays “------ “

400Ω4kΩ40kΩ400kΩ4MΩ40MΩ

250VDC or AC rms


E. Resistance

0.1Ω1Ω10Ω100Ω1kΩ10kΩ

(1.2%+5)

(1%+5)

(1.2%+5)(1.5%+5)

Range Resolution Overload Protection Remarks

F. Diode Test

A good silicon junction dropsbetween 0.5V and 0.8V.

250V DC or AC1mV

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Range Resolution Overload Protection Remarks

G. Continuity Test Test

l The buzzer sounds when the test resistance is 10Ω.l The buzzer does not sound when the test resistance is 100Ω.

250V DC or AC0.1Ω

10Hz~10MHz0.1%~99.9%

250V DC or AC rms


0.001Hz0.1%

(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

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l The specification is same as Hi. Under Multimeter mode, press RANGE button to toggle between frequency and duty cycle mode.l On the top right corner 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 “ ————“

40nF400nF4µF40µF100µF

250V DC or AC rms


10pF100pF1nF10nF100nF

Under REL mode: (3%+10)

(3%+8)

(4%+8)

I. Capacitance

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This operating manual is subject to change without notice.

** END **

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Copyright 2006 Uni-Trend Group Limited.All rights reserved.

Manufacturer:Uni-Trend Technology (Dongguan) LimitedDong Fang Da DaoBei Shan Dong Fang Industrial Development DistrictHu Men Town, Dongguan CityGuang Dong ProvinceChinaPostal Code: 523 925

Headquarters:Uni-Trend Group LimitedRm901, 9/F, Nanyang Plaza57 Hung To RoadKwun TongKowloon, Hong KongTel: (852) 2950 9168Fax: (852) 2950 9303Email:[email protected]://www.uni-trend.com

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ut81b

Documents

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press hold

press trig

shown black

shown white

press time

dc relative

press mode