model ut803 operating manual · in this manual, a warning identifies conditions and actions that...

Model UT803OPERATING MANUAL

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Model UT803: OPERATING MANUAL

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OverviewUnpacking InspectionSafety InformationRules For Safe OperationInternational Electrical SymbolsThe Meter StructureRotary SwitchFunctional ButtonsDisplay SymbolsMeasurement Operation A. DC or AC Voltage Measurement B. DC or AC Current Measurement C. Measuring Resistance D. Testing for Continuity E. Testing Diodes F. Capacitance Measurement G. Frequency Measurement H. Temperature Measurement I . Measuring TransistorOperation of Hold ModeThe POWER ButtonThe SELECT ButtonTurning on the Display BacklightThe RANGE ButtonThe MAX MIN ButtonAC/AC+DC Button

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TITLE PAGE3536363738383941424344444546474748484951525253535454555555


POWER INPUT SwitchSleep ModeRS232 ButtonGeneral SpecificationsAccuracy Specifications A. DC Voltage B. AC Voltage C. DC Current D. AC Current E. Resistance F. Continuity Test G. Diode Test H. Capacitance I . Frequency J. Temperature K. TransistorMaintenance A. General Service B. Replacing the Fuses C. Replacing the BatteryRS232C and USB Serial PortSystem Requirements for Installing the UT803 Interface ProgramRS232C Serial Port A. Connecting between the Meter and computer B. RS232C Port Cable C. Setting of RS232C Serial PortsUSB Serial Port A. Connecting between the Meter and computer B. Setting of USB Serial Ports

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Overview

This Operating Manual covers information on safetyand cautions. Please read the relevant informationcarefully and observe all the Warnings and Notes strictly.

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

Digital Bench-Type True RMS Multimeter Model UT803(hereafter referred to as “the Meter”) has autorangeand manual range options with maximum reading 5999and 3 5/6 digits which has a unique outlook design.

In addition to all the conventional features includingDC/AC voltage, current, resistance, diode, continuitytest, capacitance, temperature 0C and 0F, transistor,max/min, there is a data hold, low battery display, sleepmode, RS232C and USB standard serial port for easyconnection with computer to realize macro recording

and monitoring and capture of transient dynamic data,displaying change of waveform during the measurement,providing data and evidence to engineering techniciansfor scientific research.

This is also a highly applied digital multimeter of goodperformance with full overload protection and displaybacklight function.


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Unpacking InspectionOpen the package case and take out the Meter. Check the following items carefully to see any missing or damagedpart:

Item Description Qty

In the event you find any missing or damage, please contact your dealer immediately.


Operating Manual

Test Lead

Alligator Clip

Multi-Purpose Socket

Point Contact Temperature Probe (to be used under 2300C temperature measurement)

Power Cord (AC 250V)

RS232C Interface Cable

USB Interface Cable

Installation Guide & Computer Interface Software (CD-ROM)

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1 piece

1 pair

1 pair

1 piece

1 piece

1 piece

1 piece

1 piece

1 piece

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Safety InformationThis Meter complies with the standards IEC61010: inpollution degree 2, overvoltage category (CAT. I 1000V,CAT.II 600V) and double insulation.

CAT III: Distribution level, fixed installation, with smallertransient overvoltages than CAT. IVCAT IV: Primary supply level, overhead lines, cablesystems etc.

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 pose hazards to the user, or may damagethe Meter or the equipment under test.

A Note identifies the information that user should payattention on.

International electrical symbols used on the Meter andin this Operating Manual are explained on page 8.


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Rules For Safe Operation

WarningTo 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 not usethe Meter if it is damaged or the case (or part of thecase) is removed. Look for cracks or missing plastic. Pay attention to the insulation around the connectors.Inspect the test leads for damaged insulation or exposedmetal. Check the test leads for continuity. Replacedamaged test leads with identical model number orelectrical specifications before using the Meter.Do not apply more than the rated voltage, as markedon the Meter, between the terminals or between anyterminal and grounding.The rotary switch should be placed in the right positionand no any changeover of range shall be made duringmeasurement is conducted to prevent damage of theMeter.

When the Meter working at an effective voltage over60V in DC or 30V rms in AC, special care should betaken for there is danger of electric shock.Use the proper terminals, function, and range foryour measurements.If the value to be measured is unknown, use themaximum measurement position and reduce therange step by step until a satisfactory reading isobtained.Do not use or store the Meter in an environment ofhigh temperature, humidity, explosive, inflammableand strong magnetic field. The performance of theMeter may deter iorate af ter dampened.When using the test leads, keep your fingers behindthe finger guards.Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity,diodes, current, or capacitance.Before measuring current, check the Meter’s fusesand turn off power to the circuit before connectingthe Meter to the circuit.


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Replace the battery as soon as the battery indicator appears. With a low battery, the Meter mightproduce false readings that can lead to electric shockand personal injury.Remove test leads, temperature probe, RS232Cinterface cable, USB interface cable and alligator clipfrom the Meter and turn the Meter power off beforeopening the Meter case.When servicing the Meter, use only the same modelnumber or identical electrical specificationsreplacement parts.The internal circuit of the Meter shall not be alteredat will to avoid damage of the Meter and any accident.Soft cloth and mild detergent should be used to cleanthe surface of the Meter when servicing. No abrasiveand solvent should be used to prevent the surfaceof the Meter from corrosion, damage and accident.The Meter is suitable for indoor use.

Turn the Meter power off when it is not in use.Take out the battery when not using for a long timeif using battery to power on the Meter.When using battery to power on the Meter, constantlycheck the battery as it may lead when it has beenusing for some time, replace the battery as soon asleaking appears. A leaking battery will damage theMeter.


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International Electrical Symbols

AC or DC

Grounding

Double Insulated

Warning. Refer to the Operating Manual

Deficiency of Built-In Battery

Continuity Test

Diode

Capacitance Test

Fuse

Conforms to Standards of European Union

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The Meter Structure (see figure 1)

1. LCD Display 2. Rotary Switch3. Input Terminals 4. Functional Buttons


(Figure 1)

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Rotary Switch

Below table indicated for information about the rotary switch positions:

AC and DC voltage measurement

:Continuity test.

:Diode test.

:Resistance measurement.

Capacitance test

:Frequency measurement.

:Temperature in Fahrenheit

Temperature in celsius

Transistor test

AC or DC current measurement range from 0.1uA to 5999uA.

AC or DC current measurement range from 0.01mA to 599.9mA.

AC or DC current measurement range from 0.01A to 10.00A.

V

mAA

A


Rotary Switch Position Function

Hz0F0C

hFE

Hz0F

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Functional ButtonsBelow table indicated for information about the functional button operations.

Turn the power on and off.

Turn the display backlight on and off.

Switches between AC and DC measurement.

Switches between continuity and diode and resistance measurements

Switches between frequency and Fahrenheit temperature.

Press HOLD to enter and exit the Hold mode in any mode, the Meter beeps.

Press RANGE to switch between manual and auto ranging.

Turn on or off the serial port interface without changing the original setting.

Starts recording of maximum and minimum values. Steps the display through high (MAX) and low (MIN).

To select AC or AC+DC measurement.


Button

POWER

LIGHT

SELECT

HOLD

RANGE

RS232C

MAX MIN

AC AC+DC

Operation Performed

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HOLDhFE MIN

MAX

RS232AC+DC Trus RMS

Auto Range Manual

Trms

0C umVA

DC munF 0F~mV

Mk Hz

12 10 1 11

5.6.7

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2

16

13 3 4

8

9

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Display Symbols (see figure 2)

(Figure 2)

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SymbolNumber


True RMS

HOLD

AC

DC

AC+DC

OL

,K ,M

A, mA, µA

Meaning

Indicator for true rms value.

Data hold is active.

Sleep Mode feature is enabled.

Indicates negative reading.

Indicator for AC voltage or current.

Indicator for DC voltage or current

Indicator for AC+DC measurement

The input value is too large for the selected range.

:Ohm. The unit of resistance.

:kilohm. 1 x 103 or 1000 ohms.

:Megaohm.1x106 or 1,000,000 ohms.

A :Amperes (amps).The unit of current.

mA:Milliamp. 1 x 10-3 or 0.001 amperes.

µA : Microamp. 1x 10-6 or 0.000001 amperes.

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2

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9

K

M

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SymbolNumber


Meaning

V : Volts. The unit of voltage.

mV: Millivolt.1 x 10-3 or 0.001 volts.

F : Farad.The unit of capacitance.

mF: Millifarad.1 x 10-3 or 0.001 farads

µF : Microfarad.1x10-6 or 0.000001 farads.

nF : Nanofarad.1 x 10-9 or 0.000000001 farads.

Centigrade temperature

Temperature in Fahrenheit

Hz : Hertz. The unit of frequency in cycles/second.

kHz : Kilohertz. 1 x 103 or 1,000 hertz.

MHz: Megahertz. 1 x 106 or 1,000,000 hertz.

Unit of transistor.

Test of diode

The continuity buzzer is on.

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V, mV

F, mF,

µF,nF

0C, 0F

Hz, kHz,

MHz

β

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SymbolNumber


AutoRange

Manual

Meaning

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Indicator of Auto or manual range

Display of maximum or minimum value.

Data output is in progress.

The battery is low.

Warning: To avoid false readings, which could lead to possible electric shock or

personal injury, replace the battery as soon as the battery indicator appears.

Transistor test is on

MAX

RS232

MIN

hFE

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Measurement Operation

A. DC or AC Voltage Measurement (See figure 3)

WarningTo avoid harms to you or damages to the Meter fromelectric shock, please do not attempt to measurevoltages higher than 1000V although readings maybe obtained.

To measure DC/AC voltage, connect the Meter asfollows:


1.

2.

3.

Insert the red test lead into the V terminal and theblack test lead into the COM terminal. If the measuredvalue is less than 600mV, insert the red test leadinto mV terminal instead and press RANGE buttonto select manual range 600.0mV mode, the LCDdisplays “MANUAL” and “mV”.Set the rotary switch to V ; press SELECT buttonto select DC or AC measurement mode.Connect the test leads across with the object beingmeasured. The measured value shows on the display.AC measurement displays True RMS value.

(Figure 3)

4. Press AC/AC+DC button to measure AC+DC voltage’s true RMS.

NoteIn each range, the Meter has an input impedance of10M except 600mV range has 3000M . Thisloading effect can cause measurement errors in highimpedance circuits. If the circuit impedance is lessthan or equal to 10k , the error is negligible (0.1%or less).When DC/AC voltage measurement has beencompleted, disconnect the connection between thetesting leads and the circuit under test, and removethe testing leads away from the input terminals ofthe Meter.

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B. DC or AC Current Measurement (See figure 4)

WarningBefore connect the Meter in serial with the testedreturn circuit, close the return circuit’s current to avoidthe dangerous of sparking.If the fuse burns out during measurement, the Metermay be damaged or the operator himself may be hurt.Use proper terminals, function, and range for themeasurement. When the testing leads are connectedto the current terminals, do not parallel them acrossany circuit.

To measure current, do the following:

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1.

2.

3.

4.

Insert the red test lead into the µA mA terminal andthe black test lead into the COM terminal.Set the rotary switch to an appropriate measurementposition in µA , mA or A , press SELECT buttonto select AC or DC measurement mode.Connect the test leads in serial with the object beingmeasured. The measured value shows on the display.AC measurement displays True RMS value.Press AC/AC+DC button to measure AC+DCcurrent’s true RMS

(Figure 4)

NoteIf the value of current to be measured is unknown,use the maximum measurement position, and reducethe range step by step until a satisfactory reading isobtained.For safety sake, each measurement time of highcurrent (>5A) should be less than 10 seconds andthe interval time between 2 measurements shouldbe greater than 15 minutes.When current measurement has been completed,disconnect the connection between the testing leadsand the circuit under test, and remove the testingleads away from the input terminals of the Meter.

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C. Measuring Resistance (see figure 5)

WarningTo avoid damages to the Meter or to the devices undertest, disconnect circuit power and discharge all thehigh-voltage capacitors before measuring resistance.To avoid harms to you, please do not attempt to inputvoltages higher than 60V DC or 30V AC.

To measure resistance, connect the Meter as follows:

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Insert the red test lead into the terminal and theblack test lead into the COM terminal.Set the rotary switch to , press SELECTbutton to select measurement mode.Connect the test leads across with the object beingmeasured. The measured value shows on the display.

1 .

2 .

3 .

(Figure 5)

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NoteThe test leads and the Meter inside wire will bringaround 0.2 to 0.5 of error to resistancemeasurement when measuring low resistance. Toobtain accurate readings in low-resistance, short-circuit the test lead beforehand and record the readingobtained, call this reading as X. Then use the equation:measured resistance value (Y) – (X) = accuratereadings of resistance.If reading with shorted test leads is not < 0.5 ,check for loose test leads, incorrect function selection,or any other reasons.When measuring high resistance (>1M ), it is normalto take several seconds to obtain a stable reading.In order to obtain stable reading, choose shorter testlead to carrying out measurement.The LCD displays OL indicating open-circuit for thetested resistor or the resistor value is higher than themaximum range of the Meter.


When resistance measurement has been completed,disconnect the connection between the testing leadsand the circuit under test, and remove the testingleads away from the input terminals of the Meter.

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D. Testing for Continuity (See figure 6)

WarningTo avoid damages to the Meter or to the devices undertest, disconnect circuit power and discharge all thehigh-voltage capacitors before testing for continuity.To avoid harms to you, please do not attempt to inputvoltages higher than 60V DC or 30V AC.

To test for continuity, connect the Meter as below:

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1.

2.

3.

4.

Insert the red test lead into the terminal and theblack test lead into the COM terminal.Set the rotary switch to and press SELECTbutton to select measurement mode.Connect the test lead across with the object beingmeasured. The buzzer sounds if the resistance of acircuit under test is < 70 , the circuit is in goodcondition. The buzzer does not sound if the resistanceof a circuit under test is >70 , the circuit is broken.The measured value shows on the display and the unit is .

(Figure 6)

NoteOpen circuit voltage around -1.2V and range is 600 .When continuity testing has been completed,disconnect the connection between the testing leadsand the circuit under test, and remove the testingleads away from the input terminals of the Meter.

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E. Testing Diodes (See figure 7)

WarningTo avoid possible damage to the Meter and to thedevice under test, disconnect circuit power anddischarge all high-voltage capacitors before testingdiodes.To avoid harms to you, please do not attempt to inputvoltages higher than 60V DC or 30V AC.

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

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(Figure 7)

To test a diode out of a circuit, connect the Meter as follows:

NoteConnect the test leads to the proper terminals assaid above to avoid error display. The LCD willdisplay OL indicating diode being tested is open orpolarity is reversed. The unit of diode is Volt (V),displaying the forward voltage drop readings.Open circuit voltage is around 2.7V.

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Insert the red test lead into terminal and the blacktest lead into the COM terminal.Set the rotary switch to and press SELECTbutton to select measurement mode.For forward voltage drop readings on anysemiconductor component, place the red test leadon the component’s anode and place the black testlead on the component’s cathode. The measuredvalue shows on the display.

1.

2.

3.

When diode testing has been completed, disconnectthe connection between the testing leads and thecircuit under test, and remove the testing leads awayfrom the input terminals of the Meter.

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F. Capacitance Measurement (See figure 8)

WarningTo avoid damage to the Meter or to the equipmentunder test, disconnect circuit power and dischargeall high-voltage capacitors before measuringcapacitance. Use the DC Voltage function to confirmthat the capacitor is discharged.

To measure capacitance, connect the Meter as follows:1. Insert the red test lead into the Hz mV 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 measured. The measured value shows on the display.

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(Figure 8)

NoteThe Meter displays a fixed value which is thedistributed capacitor’s value of the inside Meter. Toensure accuracy, it is necessary to subtract this valuefrom the measured value when measuring smallcapacitor.Multi-purpose socket can be used instead of testingleads. Insert the capacitor being tested into thecorresponding input terminal of the multi-purposesocket. When measuring small capacitor value,more accurate value can be obtained using multi-purpose socket.It is normal to take a longer time when testing acapacitor value higher than 600µF.The LCD displays OL indicating the tested capacitoris shorted or it exceeds the maximum range.

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When capacitance measurement has beencompleted, disconnect the connection between thetesting leads and the circuit under test and removethe testing leads away from the input terminals ofthe Meter.

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G. Frequency Measurement (see figure 9)

WarningTo avoid harms to you, please do not attempt to inputtested frequency’s voltages higher than 30V rms.

To measure frequency, connect the Meter as follows:

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1.

2.

3.

Insert the red test lead into the Hz terminal and theblack test lead into the COM terminal.Set the rotary switch to Hz0F and press SELECTbutton to select Hz measurement mode.Connect the test leads across with the object beingmeasured. The measured value shows on the display.

(Figure 9)

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NoteWhen making frequency measurement, it must complywith the following scope (a) requirement:When 10Hz ~ 1Mz :150mV a 30V rmsWhen > 1Mz~ 10MHz :300mV a 30V rmsWhen > 10Mz~ 50MHz :600mV a 30V rmsWhen > 50Mz :UnspecifiedWhen frequency measurement has been completed,disconnect the connection between the testing leadsand the circuit under test, and remove the testingleads away from the input terminals of the Meter.


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H. Temperature Measurement (see figure 10)

WarningTo avoid harms to you, please do not attempt to inputvoltages higher than 60V DC or 30V AC.

To measure temperature, connect the Meter as follows:


1.

2.

3.

4.

Set the rotary switch to 0C to measure degree celsiustemperature or Hz0F and press SELECT button toselect 0F measurement mode to measure Fahrenheittemperature.Insert the multi-purpose socket into the correspondingHz and COM terminal.Insert the temperature probe to the correspondinginput terminal of the multi-purpose socket.Place the temperature probe to the object beingmeasured. The measured value shows on the displayafter few seconds.

(Figure 10)

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NoteThe testing environment must between 180C to 280Cto ensure accuracy especially when measuring lowtemperature.Different reading may be obtained when testing roomenvironment under short or open circuit situation,then short-circuited reading shall be considered asthe correct reading.The included point contact temperature probe canonly be used under 2300C. For any measurementhigher than that, the rod type temperature probemust be used instead.


When temperature measurement has beencompleted, disconnect the connection between thetemperature probe, multi-purpose socket and thecircuit under test, and remove the temperature probeaway from the input terminals of the multi-purposesocket, and remove the multi-purpose socket awayfrom the input terminals of the Meter.

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I. Measuring Transistor (see figure 11)

WarningTo avoid harms to you, please do not attempt to inputvoltages higher than 60V DC or 30V AC.

NoteWhen transistor measeurement has been completed,remove the tested transistor from the multi-purposesocket and remove the multi-purpose scoket fromthe input terminal

To measure transistor, connect the Meter as follows:


Insert the multi-purpose socket into the µAmA andHz input terminal.Set the rotary switch to hFE.Insert the NPN or PNP type transistor to be testedinto the corresponding input terminals of the multi-purpose socket.The measured nearest transistor value shows onthe display.

1.

2.3.

4. PNP NPN

(Figure 11)l

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Operation of Hold Mode

WarningTo avoid possibility of electric shock, do not use Holdmode to determine if circuits are without power. TheHold mode will not capture unstable or noisy readings.

The Hold mode is applicable to all measurement functions.

Press HOLD to enter Hold mode.Press HOLD again to exit Hold mode and the Meterdisplays the present measurement value.In Hold mode, is displayed.

The POWER Button

This is a self-lock switch uses to turn on or off the powerof the Meter. It is located at the tail of the Meter."I" means power up the Meter while "O" means poweroff the Meter.

The SELECT ButtonIt uses for selecting the required measurement functionwhen there is more than one function at one positionof the rotary switch.


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Turning on the Display Backlight

WarningIn order to avoid the hazard arising from mistakenreadings in insufficient light or poor vision, pleaseuse Display Backlight function.

Press LIGHT button to turn the Display Backlight on.Press LIGHT button again to turn the Display Backlightoff, otherwise it will stay on continuously.When using the AC power to turn the Meter on, theDisplay Backlight always stays on.

The RANGE ButtonPress RANGE to enter the manual ranging mode;the Meter beeps.Press and hold RANGE for over 1 second to returnto autoranging; the Meter beeps.


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The MAX MIN ButtonMAX MIN recording mode captures and stores themaximum and minimum input value detected.

To use the MAX MIN mode as follows:

Press MAX MIN to display the highest reading( MAX is shown on display).Press MAX MIN again to display the lowest reading( MIN is shown on display).Press and hold MAX MIN for over 1 second to exitthe MAX MIN mode.

AC/AC+DC ButtonIt is used to select measuring AC or AC+DC whenmeasuring AC. Press it only at the AC voltage or currentmeasuring mode which is at the rotary switchposition V , mV ,µA , mA or A . “+DC “ willbe displayed when it is pressed under DC measurementmode.

POWER INPUT SwitchIt is used to select AC 220V/50Hz or DC 6pcs of 1.5Vbattery (R14) to power on the Meter. It is located at thetail of the Meter.


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Sleep Mode

When the Meter display symbol, it automaticallyturns off if you do not turn the rotary switch or pressany button for around 10 minutes to preserve battery.The last measurement value wil l be kept.

The Meter can be activated by pressing the POWERbutton off and then on or pressing the HOLD button, itwill display the last measurement value before it enteredsleep mode and under the HOLD mode.Turning the rotary switch can also activate the Meter.However, it will start from the switch selected functionand it will not display the last measurement value beforeit entered sleep mode.

To disable the Sleep Mode function, press MAX MIN,RANGE, or RS232 button while turning on the Meter,the symbol disappears.

RS232 ButtonPress RS232 button to enter or exit data output mode.In RS232C serial port data output mode, the Hold andMax Min mode cannot output to the computer, thecomputer will only display the present measuring value.In RS232C serial port data output mode, Sleep Modefunction will be disabled, symbol disappears. +DC,hFE and β cannot output to the computer.


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General SpecificationsMaximum Voltage between any Terminals andGrounding: Refer to different range input protection voltage.

Fused Protection for HzΩmV Input Terminal: 200mA, 250V, fast type, φ5x20mm (only apply on hFE functions)

Fused Protection for µAmA Input Terminal: 500mA, 250V, fast type, φ5x20mm.

Fused Protection for 10A Input Terminal: 10A, 250V, fast type, φ5x20mm.

Fused Protection for AC220V Terminal: 200mA, 250V, fast type, φ5x20mm. At AC220V power: without fuse protection.Maximum Display : Digital: 5999Measurement Speed: Updates 2-3 times/second.Range : Manual or auto ranging.Polarity Display : AutoOverloading Display : OLTemperature: Operating: 00C to +400C (320F to +1040F). Storage : -100C to +500C (140F to +1220F).

Relative Humidity: 75% @ 00C - 300C below; 50% @ 30 - 400C.Altitude: Operating: 2000 m. Storage : 10000 m.Below 1V/m electrostatic discharge: Accuracy = specified accuracy + 5% of the range. Over 1V/m electrostatic discharge:Without specified accuracy.Power: AC220V/50Hz or 6 pieces of 1.5V battery (R14).Battery Deficiency: DisplayDimensions (HxWxL): 105 x 240 x 310 mm.Weight: Approximate 2kg (accessories excluded).Safety/Compliances: IEC61010 CAT. I 1000V, CAT. II 600V overvoltage and double insulation standard.Certifications: , UL pending.


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Accuracy Specifications

Accuracy: (a% reading + b digits),guarantee for 1 year.Operating temperature: 230C 50C.Relative humidity: not more than 75% RH.Temperature coefficient: 0.1 x (specified accuracy)/10C.

Remarks:Input Impedance: At 600mV range : Around > 3000M . At all other ranges: Around 10M .


A. DC Voltage

Range Resolution Accuracy Overload Protection

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600mV

6V

60V

600V

1000V

0.1mV

0.001V

0.01V

0.1V

1V

1000V

(0.6%+2)

(0.3%+2)

(0.5%+3)

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B. AC Voltage


40Hz-50kHz: (0.6%+5)

>50kHZ-100kHz: (1%+5)

40Hz-1kHz: (0.6%+5)

>1kHz-10kHz: (1.0%+5)

>10kHz-100kHz: (3%+5)

40Hz-1kHz: (0.6%+5)

>1kHz-10kHz: (1.5%+5)

>10kHz-20kHz: (3%+5)

>20kHz-100kHz: (8%+5)

40Hz-1kHz: (0.6%+5)

>1kHz-10kHz: (3.5%+5)

40Hz-1kHz: (1.2%+3)

>1kHz-3kHz: (3%+3)

600mV

6V

60V

600V

1000V

0.1mV

0.001V

0.01V

0.1V

1V

1000V

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Remarks:Input Impedance: At 600mV range : Around > 3000M At all other ranges: Around 10MDisplays: True RMS (applicable to the range of 10%~95%) At 1000V range: AC peak factor 1.5. All other ranges: AC peak factor 3.0. Input short circuit has around less than 30 remaining digits, it will not affect accuracy. AC+DC measurement accuracy = range's accuracy + 1%


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Remarks:At 5A range: Continuous measurement is allowed.At >5A range: For continuous measurement 10 seconds and interval not less than 15 minutes.

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C. DC Current

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600µA

6000µA

60mA

600mA

10A

0.1µA

1µA

0.01mA

0.1mA

10mA

(0.5%+3)

(0.8%+3)

(1.2%+3)

Fuse 500mA, 250V,

fast type, φ5x20mm.

Fuse 10A, 250V,

fast type, φ5x20mm.

Remarks:At 5A range: Continuous measurement is allowed.At >5A range : For continuous measurement 10 seconds and interval not less than 15 minutes.Displays: True RMS (applicable to the range of 10%~95%) AC peak factor 3.0. Input short circuit has around less than 30 remaining digits, it will not affect accuracy. AC+DC measurement accuracy = range's accuracy + 1%

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Fuse 500mA, 250V, fast

type, 5x20mm.

Fuse 10A,250V,

fast type, 5x20mm.


D. AC Current

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600µA

6000µA

60mA

600mA

10A

0.1µA

1µA

0.01mA

0.1mA

10mA

40Hz~10kHz: (1.0%+5)

>10kHz~15kHz: (2%+5)

40Hz~10kHz: (1%+5)

>10kHz~15kHz: (3%+5)

40Hz~5kHz: (2.0%+6)

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(0.8%+3) + test lead short

circuit resistance value

(0.5%+2)

(0.8%+2)

(1.2%+3)


E. Resistance


600

6k

60k

600k

6M

60M

0.1

0.001k

0.01k

0.1k

0.001M

0.01M

250V rms

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Open circuit voltage approximate -1.2V.

When circuit disconnected with resistance value

> 70 , buzzer does not beep.

When circuit is in good connection with resistance

value 70 buzzer beeps continuously.

Open circuit voltage approximate 2.7V.

Working current approximate 1mA.


F. Continuity Test

G. Diode Testst

10mV 250V rms

RemarksRange Resolution Overload Protection

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250V rms1


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Remarks:At 6nF, 60nF and 600nF Range: reading must subtract the test lead open circuit capacitance value.

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H. Capacitance

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0.001nF

0.01nF

0.1nF

0.001µF

0.01µF

0.1µF

0.001mF

6nF

60nF

600nF

6µF

60µF

600µF

6mF

(2.5%+5)

(2%+5)

(3%+4)

(5%+4)

250V rms

Remarks:Input scope (a): (DC electric level is zero)When 10Hz ~ 1MHz : 150mV a 30V rmsWhen > 1MHz ~ 10MHz : 300mV a 30V rmsWhen > 10MHz ~ 50MHz : 600mV a 30V rmsWhen > 50MHz : Unspecified

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I. Frequency

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6kHz

60kHz

600kHz

6MHz

60MHz

0.001kHz

0.01kHz

0.1kHz

0.001MHz

0.01MHz

(0.1%+3) 250V rms

Remarks:The included point contact temperature probe can only be used to measure under 2300C temperature. For anymeasurement higher than that, the rod type temperature probe must be used instead.

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Fuse 200mA, 250V, fast type, 5x20mm.

Fuse 500mA, 250V, fast type, 5x20mm


K. Transistor

J. Temperature

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hFE 1Vce 2.2V bo 10µA

1000 MAX


-400C~00C

>00C~4000C

>4000C~10000C

-400C~320C

>320F~7520F

>7520F~18320F

(8%+5)

(1%+3)

(1.5%+3)

(8%+5)

(1.5%+5)

(2.5%+5)

0C

0F

10C

10F

250V rms


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MaintenanceThis section provides basic maintenance informationincluding battery and fuse replacement instruction.

WarningDo not attempt to repair or service your Meter unlessyou are qualified to do so and have the relevantcalibration, performance test, and service information.To avoid electrical shock or damage to the Meter, doyou get water inside the case.

A. General Service

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 affect readings.Turn off the power of the Meter when it is not in use.Take out the battery when it is using for a long time.Do not use or store the Meter in a place of humidity,high temperature, explosive, inflammable and strongmagnetic field.

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B. Replacing the Fuses (see figure 12)

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

To replace the Meter’s fuse:1. Press the POWER to turn the Meter off, disconnect the power cord and remove all connections from the terminals.2. Fuse 1: Remove the screws from the power socket at the rear of the Meter. Remove the fuse by gently prying one end loose, then take out the fuse from its bracket. Then install the replacement fuse. Fuse 2 and 3: Use a coin to open the accessories compartment at the top of the front cover, then you will see a fuse compartment. Open the fuse compartment to replace fuse 2 and 3. Remove the fuse by gently prying one end loose, then take out the fuse from its bracket. Then install the replacement fuse.

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(Figure 12)

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

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Fuse 4:It is located at the PCB. Remove the fuseby gently prying one end loose, then take out thefuse from its bracket. Then install the replacementfuseInstall ONLY replacement fuses with the identicaltype and specification as follows and make sure thefuse is fixed firmly in the bracket.Fuse 1: 200mA, 250V, fast type, 5x20mm (AC220V)Fuse 2: 10A, 250V, fast type, 5x20 mm (A)Fuse 3: 500mA, 250V, fast type, 5x20 mm (µA, mA)Fuse 4: 200mA, 250V, fast type, 5x20 mm (hFE)

3.

C. Replacing the Battery (see figure 13)

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

To replace the battery:

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1.

2.

3.

4.

5.

6..

Press the POWER to turn the Meter off and removeall connections from the terminals.Use a coin to open the accessories compartment atthe top of the front case.Use a coin to open the battery compartment insidethe accessories compartment located at the top ofhe front case.Remove all the batteries from the batterycompartment.Replace the battery with new 6pcs of 1.5V battery(R14).Rejoin the battery compartment and also theaccessories compartment located at the top of thefront case.

(Figure 13)

RS232C and USB Serial Port

To use UT803 Interface Program, you need the followinghardware and software:

An IBM PC or equivalent computer with 80486 orhigher processor and 600 x 800 pixel or better monitor.Microsoft Windows 95 or above.At least 8MB of RAM.At least 8MB free space in hard drive.Can access to a local or a network CD-ROM.A free serial port.A mouse or other pointing device supported byWindows.

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System Requirements for Installing the UT803Interface Program

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RS232C Serial Port

UT803 Back Faceplate

To COMPUTER

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A. Connecting between the Meter and computer (see figure 14)

(Figure 14)

C. Setting of RS232C Serial Ports

Default of RS232C serial port for communication is set as: Baud Rate 19200 Start bit 1 Stop bit 1 Data bits 7 Parity Odd

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B. RS232C Port Cable

D-sub9 Pin Male 1 (DCD) 2 (RXD) 3 (TXD) 4 (DTR) 5 (SG) 6 (DSR) 7 (RTS) 8 (CTS) 9 (RI)

ComputerD-sub

9 Pin Female 1 (DCD) 3 (TXD) 2 (RXD) 4 (DTR) 5 (SG) 6 (DSR) 7 (RTS) 8 (CTS) 9 (RI)

D-sub25 Pin Female 8 (DCD) 2 (TXD) 3 (RXD) 20 (DTR) 7 (SG) 6 (DSR) 4 (RTS) 5 (CTS) 22 (RI)

The Meter

USB Serial Port

UT803 Back Faceplate

To COMPUTER

USB INTERFACE CABLE

B. Setting of USB Serial Ports

Install the USB serial port driver according to theInstallation Guide & Computer Interface Softwarebefore connecting the Meter and computer.

Check for the USB Serial port shown at the ControlPanel => System => Device Manager. Make sureconnect the Meter and the computer with the sameport.

Please refer to the included “Installation Guide &Computer Interface Software” for installing andoperating instructions of the UT803 Interface Program..

The Meter is to be supplied from an identical USB portcomplying with the requirement of Limit Power Source.

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A. Connecting between the Meter and computer (see figure 15)

(Figure 15)

**END**

model ut803 operating manual · in this manual, a warning identifies conditions and actions that...

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