ut70c

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Table of ContentsTitleOverviewUnpacking InspectionSafety InformationRules For Safe OperationInternational Electrical SymbolsThe Meter StructureRotary SwitchFunctional ButtonsDisplay SymbolsMeasurement Ranges

A. Selecting a Measurement RangeB. Manual Ranging and Autoranging

Measurement OperationA. AC Voltage MeasurementB. DC Voltage MeasurementC. DC Milivolt MeasurementD. Measuring Continuity, Resistance,

Conductance & CapacitanceE. Testing DiodesF. DC or AC Current MeasurementG. Frequency & Duty Cycle Measurement

MAX MIN Recording ModePEAK MAX MIN ModeOperation of Hold ModeOperation of Auto Hold ModeThe Use of Relative Value and RelativePercentage Value ModeTurning on the Display BacklightAnalogue Bar Graph DisplayFull Icons DisplaySleep ModeGeneral Specifications

Model UT70C: OPERATING MANUAL

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Accuracy SpecificationsA. AC VoltageB. DC VoltageC. Continuity, Resistance & Conductance TestD. CapacitanceE. Diodes TestF. DC CurrentG. AC CurrentH. Frequency & Duty Cycle

MaintenanceA. General ServiceB. Testing the FusesC. Replacing the BatteryD. Replacing the Fuses

RS232C Serial PortA. RS232C Port CableB. Setting of RS232C Serial PortsC. System Requirements for Installing the

UT70C Interface Program


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Overview

This Operating Manual covers information on safety andcautions. Please read the relevant information carefullyand observe all the Warnings and Notes strictly.

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

Your multimeter is an intelligent digital one, a preciseinstrument with a resolution of 8,000 counts and up-to-date automatic computer calibrating function. Highresolution A/D converter and micro-controller dataprocessing technique is adopted in the Meter, featuredwith intelligence, high precision and multi-functions. TheMeter can be widely used in laboratory, field service,domestic and other applications. All the functions andranges have overloaded protection.


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Unpacking Inspection

Open the package case and take out the Meter. Checkthe following items carefully to see any missing ordamaged part:

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

Item1234

56

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DescriptionOperating ManualTest LeadTest Clip9V Battery (NEDA1604, 6F22 or 006P)(installed)RS232C Interface CableCD-ROM (Installation Guide & ComputerInterface Software)HolsterTilt Stand

Qty1 piece1 pair1 pair

1 piece

1 piece1 piece

1 piece1 piece


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Safety Information

CAT. II: Local level, appliance, PORTABLE EQUIPMENTetc., with smaller transient voltage overvoltages thanCAT. III

CAT. III: Distribution level, fixed installation, with smallertransient overvoltages than CAT. IV

CAT 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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CE Version: The Meter complies with the standardsIEC61010-1:in pollution degree 2, overvoltage categoryCAT III 1000V, CAT IV 600V and double insulation .UL Version: The Meter complies with the standards UL61010B-1,in pollution degree 2, overvoltage category CAT II 1000Vand double insulation.



Rules For Safe Operation (1)

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:

l Before using the Meter inspect the case. Donot use the Meter if it is damaged or the case(or part of the case) is removed. Look for cracksor missing plastic. Pay attention to the insulationaround the connectors.

l Inspect the test leads for damaged insulationor exposed metal. Check the test leads forcontinuity. Replace damaged test leads withidentical model number or electricalspecifications before using the Meter.

l Do not apply more than the rated voltage, asmarked on the Meter, between the terminals orbetween any terminal and grounding.

l 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.

l Never working at an effective voltage over 60Vin DC or 30V rms in AC for there is danger ofelectric shock.

l Use the proper terminals, function, and rangefor your measurements.

l 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.

l When using the test leads, keep your fingersbehind the finger guards.


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Rules For Safe Operation (2)

l Disconnect circuit power and discharge all high-voltage capacitors before testing resistance,conductance, continuity, diodes, current, orcapacitance.

l Before measuring current, check the Meter'sfuses and turn off power to the circuit beforeconnecting the Meter to the circuit.

l Replace the battery as soon as the batteryindicator appears. With a low battery, theMeter might produce false readings that canlead to electric shock and personal injury.

l Remove test leads, RS232C interface cable andtest clip from the Meter and turn the Meter poweroff before opening the Meter case.

l When servicing the Meter, use only the samemodel number or identical electricalspecifications replacement parts.

l The internal circuit of the Meter shall not bealtered at will to avoid damage of the Meter andany accident.

l Soft cloth and mild detergent should be usedto clean 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.

l The Meter is suitable for indoor use.l Turn off the Meter when it is not in use and

take out the battery when not using for a longtime.

l 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

The Meter Structure (see figure 1)

(figure 1)

1 Front Case2 LCD Display3 Functional Buttons4 Rotary Switch5 Input Terminals

AC (Alternating Current)

DC (Direct Current)

AC or DC

Grounding

Double Insulated

Deficiency of Built-In Battery

Continuity Test

Diode

Capacitance Test

Fuse

Warning. Refer to the Operating Manual

Conforms to Standards of European Union


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mV

V

OFF

V

Rotary Switch

Below table indicated for information about the rotaryswitch positions.

RotarySwitch

Position

Function

Power is turned off.

AC voltage measurement.DC voltage measurement.DC millivolt measurement.

: Continuity test.: Resistance measurement.: Capacitance test.

Diode Test.AC or DC Current Measurementfrom 0.001A to 10.00A .AC or DC Current Measurementfrom 0.1mA to 800.0mA.

A

mA


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Functional Buttons (1)

Below table indicated for information about the functionalbutton operations.

Button Operation PerformedMeasuringFunction

ContinuityTest

Turn the continuity buzzer on andoff in resistance measurementmode.

At OFFposition

At RECmode orREC modeplus Holdmode

Press while turning on theMeter to disable the beeper at allfunctions except short circuit anddiode testing.To toggle between 100msresponse time and 1ms responsetime under REC mode except atresistance, capacitance andcontinuity range.

MAXMIN

Any rotaryswitchpositionexcept atconductancemode.

Starts recording of maximum andminimum values. Steps thedisplay through the sequence ofpresent, high (MAX), low (MIN)and average (AVG) readings atany mode.In 1ms response time, it stepsthrough only MAX and MINreading.

At OFFposition

To select 1 second high accuracyresponse time, press and holddown MAX MIN while turning therotary switch to any functionsetting.

RANGE Any rotaryswitchposition

1. Press RANGE to enter themanual ranging mode; theMeter beeps.

2. Press RANGE to stepthrough the ranges availablefor the selected function; theMeter beeps.

3. Press and hold RANGE forover 1 second to return toautoranging; the Meterbeeps.


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HOLD Any rotaryswitchposition

Press HOLD to enter and exit theHold mode in any mode; theMeter beeps.

Functional Buttons (2)

Conductancemode

Press HOLD to toggle betweenconductance and resistancevalue. Present resistance valueis kept.Press to select capacitancetest.

A , mA Press to select DC or ACcurrent. DC is default.

At OFFposition

To disable the Sleep Mode, press while turning on the Meter.

REL Any rotaryswitchposition

Press REL to enter and exit the and % mode in any measuringmode; the Meter beeps.

Hz V , V ,mV , A ,mA

1. Press Hz to enter frequencymeasurement mode; theMeter beeps.

2. Press Hz again to enter dutycycle measurement mode;the Meter beeps.

3. Press Hz again to return tothe last measurement mode;the Meter beeps.

DisplayBacklight

Press once to turn the DisplayBacklight on and it shall shut offautomatically in around 60seconds later.


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No. MeaningSymbol

Display Symbols (1) (see figure 2)

(figure 2)

1 The Meter is in the auto range mode inwhich the Meter automatically selects therange with the best resolution.

2 The battery is low.Warning: To avoid false readings,

which could lead to possible electricshock or personal injury, replace thebattery as soon as the battery indicatorappears.

3 Indicates negative reading.

4 Test of diode.

5 The continuity buzzer is on.

6 The relative value mode is on, whichdisplay the present value minus the storedvalue.

%7 The relative percentage value mode ison. It displays the percentage value ofthe relative value and stored value.

DATAHOLD

8 Data hold is active.

DC AC Indicator for DC/AC voltage or current.The displayed value is the mean value.

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Display the present chosen range.8000mV10Percent, used for duty cyclemeasurements.

%11


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V, mV

Display Symbols (2)

12 ,k , M

W: Ohm. The unit of resistance.kW: kilohm. 1 x 103 or 1000 ohms.MW: Megohm. 1 x 106 or 1,000,000

ohms.Hz, kHz,

MHzHz: Hertz. The unit of frequency.kHz: Kilohertz. 1 x 103 or 1000 hertz.MHz: Meghertz. 1 x 106 or1,000,000

hertz.V: Volts. The unit of voltage.mV: Millivolt. 1 x 10-3 or 0.001 volts.A: Amperes (amps). The unit of

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

amperes.F: Farad. The unit of capacitance.mF: Microfarad. 1 x 10-6 or 0.000001

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

0.000000001 farads.S: Siemens. The unit of

conductance.nS: Nanosiemens. 1 x 10-9 or

0.000000001 siemens.Maximum, minimum and averagerecording mode enabled. Present readingdisplayed.

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100ms response time.Maximum reading displayed.Minimum reading displayed.Average reading displayed.

14 Provides an analogue indication of thepresent input, quick response.

15 Polarity indicator for the analogue bargraph display, no display for positive.The input value is too large for the selectedrange.

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Computer and the Meter is connectedproperly. Data output is in progress.

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A, mA

F, F, nF

nS

100msMAXMINAVG

AnalogueBar

Graph

RS232C

K :M :

:


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Measurement Ranges (1)

A measurement range determines the highest value theMeter can measure. Most Meter functions have morethan one range. See "Accuracy Specifications."

A. Selecting a Measurement Range

Being in the right measurement range is important:

l If the range is too low for the input, the Meter displays to indicate an overload.

l If the range is too high, the Meter will not displaythe most accurate measurement.

B. Manual Ranging and Autoranging

The Meter has both manual range and autorange options:

l In the autorange mode, the Meter selects the bestrange for the input detected.This allows you to switch test points without havingto reset the range.

l In the manual range mode, you select the range.This allows you to override autorange and lock theMeter in a specific range.

The Meter defaults to the autorange mode inmeasurement functions that have more than one range.When the Meter is in the autorange mode, isdisplayed.

To enter and exit the manual range mode:


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1. Press RANGE.The Meter enters the manual range mode and turns off.Each presses of RANGE increments the range.When the highest range is reached, the Meterwraps to the lowest range.

2. To exit the manual range mode, press and holdRANGE for over one second.The Meter returns to the autorange mode and is displayed.

Notel In Hold and MAX MIN mode, press RANGE exits

these measurement modes and enters manualrange mode.

l In Hz measurement mode, press RANGE to attenuate10 times of input signal amplitude which can increasethe Meter sensitivity and stabilize the correct reading.

Measurement Ranges (2)


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Measurement Operation (1)

A. 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 / 750V rms althoughreadings may be obtained.

The AC Voltage ranges are: 800.0mV, 8.000V, 80.00V,800.0V and 1000V. To measure AC Voltage, connectthe Meter as follows:

1. Insert the red test lead into the V Hz terminaland the black test lead into the COM terminal.

2. Set the rotary switch to V .3. Connect the test leads across with the object being

measured.The measured value shows on the display, whichis effective value of sine wave (mean valueresponse).

Notel In each range, the Meter has an input impedance

of 10M . This loading effect can causemeasurement errors in high impedance circuits. Ifthe circuit impedance is less than or equal to 10k ,the error is negligible (0.1% or less).

l When AC voltage measurement has been completed,disconnect the connection between the testing leadsand the circuit under test.

(figure 3)

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(figure 4)

B. DC Voltage Measurement (see figure 4)



The DC Voltage ranges are: 8.000V, 80.00V, 800.0V and1000V. To measure DC Voltage, connect the Meter asfollows:


2. Set the rotary switch to V .3. Connect the test leads across with the object being

measured.The measured value shows on the display.



l When DC voltage measurement has been completed,disconnect the connection between the testing leadsand the circuit under test.

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(figure 5)


C. DC Millivolt Measurement (see figure 5)


The DC Millivolt ranges are: 80.00mV and 800.0mV.These ranges have more than 4000M . To measureDC Millivolt, connect the Meter as follows:


2. Set the rotary switch to mV .3. Connect the test leads across with the object being




l When DC millivolt measurement has been completed,disconnect the connection between the testing leadsand the circuit under test.

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(figure 6)


D. Measuring Continuity, Resistance,Conductance & Capacitance

WarningTo avoid damages to the Meter or to the devicesunder test, disconnect circuit power and dischargeall the high-voltage capacitors before measuringcontinuity, resistance, conductance and capacitance.

When measuring capacitance, use the DC Voltagefunction to confirm that the capacitor is discharged.Never attempt to input over 60V in DC or 30V rms inAC to avoid personal dangerous.

Testing for Continuity (see figure 6)

To test for continuity, connect the Meter as below:1. Insert the red test lead into the V Hz terminal

and the black test lead into the COM terminal.2. Set the rotary switch to and press to

select measurement mode.3. The buzzer sounds if the resistance of a circuit under

test is less than 100 .

Notel The LCD displays indicating the circuit being

tested is open.l When continuity testing has been completed,

disconnect the connection between the testing leadsand the circuit under test.

Select Test

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(figure 7)

Resistance Measurement (see figure 7)


The resistance ranges are: 800.0 , 8.000k , 80.00k ,800.0k , 8.000M and 80.00M . To measureresistance, connect the Meter as follows:


2. Set the rotary switch to , resistancemeasurement is default or press to select measurement mode.

3. Connect the test leads across with the object beingmeasured.The measured value shows on the display.

Notel The test leads can add 0.1 to 0.2 of error to

resistance measurement. To obtain precisionreadings in low-resistance measurement, that is therange of 800.0 , short-circuit the input terminalsbeforehand, using the relative value function buttonREL to automatically subtract the value measuredwhen the testing leads are short-circuited from thereading.

l For high-resistance measurement (>1M ), it is normaltaking several seconds to obtain a stable reading.

SelectW Test

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l The LCD displays indicating open-circuit for thetested resistor or the resistor value is higher thanthe maximum range of the Meter.

l When resistance measurement has been completed,disconnect the connection between the testing leadsand the circuit under test.

Conductance Measurement (see figure 8)

(figure 8)

SelectnS Test

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The resistance ranges from 0.01nS to 80nS. To measureconductance, connect the Meter as follows:


2. Set the rotary switch to and press RANGEto select nS measurement mode.

3. Connect the test leads across with the object beingmeasured.The measured value shows on the display.

Notel It is possible to press HOLD to toggle between

conductance and resistance value during themeasurement of conductance.

l When conductance measurement has been completed,disconnect the connection between the testing leadsand the circuit under test.


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(figure 9)


Capacitance Measurement (see figure 9)

The Meter's capacitance ranges are: 1.000nF, 10.00nF,100.0nF, 1.000 F, 10.00 F and 100.0 F. To measurecapacitance, connect the Meter as follows:

1. Insert the red test lead or the red test clip into theV Hz terminal and the black test lead or black

test clip into the COM terminal.2. Set the rotary switch to and press to

select nF measurement mode.3. Connect the test leads or the test clips across with

the object being measured.The measured value shows on the display.

Notel For testing the capacitor with polarity, connect the

red test clip or red test lead to anode & black testclip or black test lead to cathode instead.

l It takes a longer time when testing a high capacitorvalue, the testing time is around 15 seconds in100 F range.

l When capacitance measurement has been completed,disconnect the connection between the testing leadsand the circuit under test.

SelectnF Test

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E. Testing Diodes (see figure 10)

(figure 10)

WarningTo avoid possible damage to the Meter and to thedevice under test, disconnect circuit power anddischarge all high-voltage capacitors before testingdiodes.

Use the diode test to check diodes, transistors, and othersemiconductor devices. The diode test sends a currentthrough the semiconductor junction, then measures thevoltage drop across the junction. A good silicon junctiondrops between 0.5V and 0.8V.

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


2. Set the rotary switch to .3. For forward voltage drop readings on any

semiconductor component, place the red test leadon the component's anode and place the black testlead on the component's cathode.The measured value shows on the display.

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(figure 11)


Notel In a circuit, a good diode should still produce a

forward voltage drop reading of 0.5V to 0.8V;however, the reverse voltage drop reading can varydepending on the resistance of other pathwaysbetween the probe tips.

l Connect the test leads to the proper terminals assaid above to avoid error display.

l The LCD will display indicating open-circuit forwrong connection.

l The unit of diode is Volt (V), displaying the positive-connection voltage-drop value.

l When diode testing has been completed, disconnectthe connection between the testing leads and thecircuit under test.

F. DC or AC Current Measurement (see figure 11)

WarningNever attempt an in-circuit current measurementwhere the open-circuit voltage between the circuitand ground is greater than 250V.If the fuse burns out during measurement, the Metermay be damaged or the operator himself may behurt. Use proper terminals, function, and range forthe measurement. When the testing leads areconnected to the current terminals, do not parallelthem across any circuit.

Select ACor DC Test

black red

A ormA


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The current measurement has 2 measurement positionson the rotary switch: A and mA .

The A has a 8.000A and 10.00A range, with auto ranging;the mA has a 80.00mA and 800.0mA range, with autoranging.

To measure current, do the following:1. Turn off power to the circuit. Discharge all high-

voltage capacitors.2. Insert the red test lead into the A or mA or terminal

and the black test lead into the COM terminal.3. Set the rotary switch to A or mA .

Use the A terminal and A measurement positionif the current value to be tested is an unknown.

4. The Meter defaults to DC current measurementmode. To toggle between DC and AC currentmeasurement function, press .AC current is displayed as an mean value (calibratedagainst sine wave effective value).

5. Break the current path to be tested. Connect thered test lead to the more positive side of the breakand the black test lead to the more negative side ofthe break.

6. Turn on power to the circuit.The measured value shows on the display.

Notel For safety sake, the measuring time for high current,

that is 8.000A and 10.00A range, should be 10seconds for each measurement and the intervaltime between 2 measurements should be greaterthan 15 minutes.

l When current measurement has been completed,disconnect the connection between the testing leadsand the circuit under test.


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(figure 12)


G. Frequency & Duty Cycle Measurement (see figure 12)

Frequency Measurement

The measurement ranges are: 1kHz, 10kHz, 100kHzand 1MHz. The maximum measurement range is 1MHz.To measure frequency, connect the Meter as follows:


2. Set the rotary switch to any voltage or currentmeasurement positions.

3. Press Hz to display the frequency of present signal.4. Connect the test leads across with the object being


Notel It is recommended to use mV range which has

the highest sensitivity.l The attenuate amplitude of signal is different from

different measuring positions and ranges, thereforethe required input amplitude is different whenmeasuring frequency at different measuring positionsand ranges.

l When Hz measurement has been completed,disconnect the connection between the testing leadsand the circuit under test.

Select Hzor Duty Cycle

Test

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Duty Cycle Measurement

The duty cycle measurement range is 0.01% ~ 99.99%.

To measure duty cycle:1. Set up the Meter to measure frequency.2. To select duty cycle, press Hz again (or until the %

symbol is shown on the display).3. Connect the test leads across with the object being


Notel It is recommended to use mV range.l The polarity of trigger slope is positive.l The attenuate amplitude of signal is different from

different measuring positions and ranges, thereforethe required input amplitude is different whenmeasuring duty cycle at different measuring positionsand ranges.

l When duty cycle measurement has been completed,disconnect the connection between the testing leadsand the circuit under test.


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MAX MIN recording mode applies to all measurementfunctions except at conductance measurement function.

MAX MIN recording mode captures and stores themaximum and minimum input value detected, andcalculates a running average of all readings taken.

In the MAX MIN mode, when the Meter detects an inputthat is below the recorded minimum or above the recordedmaximum, the Meter beeps and records the new minimum(MIN) or maximum (MAX) value.

In the MAX MIN mode, you can also display a runningaverage of all readings taken since the MAX MIN modewas activated. Displaying the average reading allowsyou to "smooth" a rapidly changing input by displayinga stable reading on the digital display.

The MAX MIN mode has a pre-set response time of100ms. A shorter response time captures shorter events,but with decreased accuracy. If you want 1 secondresponse time, that can be selected after power on theMeter.

To use the MAX MIN mode as follows:

(figure 13)

MAX MIN Recording Mode (1) (see figure 13)

Select MAX,MIN, AVG orPresent value

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MAX MIN Recording Mode (2)

To selectresponse time

l The pre-set response time is 100ms.l Press to select 1 ms response

time in REC mode. It is calledunder PEAK MAX MIN mode. (In1 ms response time, it stepsthrough on the sequence of MAXand MIN readings only.)

l With the rotary switch in the OFFposition, press and hold down MAXMIN while turning on the rotaryswitch to select 1 second highaccuracy response time. (MAX MINreadings for the frequency counterare recorded only in the 1 second,high accuracy response mode.)

To exit theMAX MINmode.

Press MAX MIN for over 1 second.The Meter exists MAX MIN. Recordedvalues are erased and the Meter staysin the selected range.

MAX MINFunction Action

To enter theMAX MINmode.

1. Make sure that the Meter is in thedesired measurement function andrange.

2. Press MAX MIN to enter MAX MINrecording mode. The presentreading is displayed, and the Meteris locked in the present range, andREC is displayed.

3. Each time a new low or high valueis recorded, the Meter beeps anddisplays a new reading.

(In MAX MIN mode, Sleep Modefunction will be disabled.)

To view theMAX, MIN,AVG or presentreading.

Press MAX MIN to step through on thesequence of present readings, high(MAX), low (MIN) and average (AVG)readings.

To stop andresumerecordingwithout erasingstored values

l Press HOLD to stop recording, therecorded values will not erase.

l Press HOLD again to resumerecording.


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PEAK MAX MIN Mode (see figure 14)

(figure 14)

PEAK MAX MIN mode is an additional function of .Pressing to toggle between 100ms response timeand 1ms response time. This function can only be enabledwhen the Meter is under REC mode or REC mode plusHold mode except at mode.

To enter PEAK MAX MIN mode:l Press MAX MIN or MAX MIN and HOLD to enter

REC mode.l Then press to enter PEAK MAX MIN mode (1ms

response time), it steps through the sequence ofMAX and MIN reading ONLY.

Select 1msresponse time

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Select MAXor MIN


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Operation of Hold Mode

WarningTo avoid possibility of electric shock, do not useHold mode to determine if circuits are without power.The Hold mode will not capture unstable or noisyreadings.

The Hold mode is applicable to all measurement functions.With the Auto Hold function, it automatically holds thepresent reading on the display, freeing you to concentrateon the placement of the test leads when working indangerous or difficult situations.

l Press HOLD to enter Hold mode; the Meter beeps.l Press HOLD again or RANGE or turn the rotary

switch to exit Hold mode; the Meter beeps.l In Hold mode, DATA HOLD is displayed on the

LCD.l In conductance measurement mode, press HOLD

to toggle between resistance and conductance value.Present resistance value is kept.

l The Meter displays when the selected range isoverloaded.

l The Meter beeps when a positive result is obtainedfrom continuity test, whether it is under the Holdmode or not.

l If you are in MAX MIN recording mode or modewhen HOLD is selected, Hold interrupts the function.The display does not update, but recorded readingsare not erased. Press HOLD again to resumerecording.


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Operation of Auto Hold Mode

Auto Hold means you no need to press HOLD, thereadings on the LCD will be hold automatically.

Conditions to enter Auto Hold Mode:l When input signal is larger than AC/DC 100mV,

Auto Hold mode will be enabled automatically.l When the change of signal three times continuously

within 3 digits, it will hold the last value; the Meterbeeps.

l Considers every value as the base value. Whenthe Meter detects an input which is above the basevalue 300 digits, the Meter beeps, and holds anddisplays the value as the new base value.


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The Use of Relative Value and RelativePercentage Value Mode

The and % mode applies to all measurement functions,with auto ranging.REL mode can be used together with Auto Hold andMAX MIN mode.

The definition is as follows:l Relative value ( ) = present value - stored value

For instance, if the stored value is 20.0V and thepresent value is 22.0V, the reading would be 2.0V.If a new measurement value is equal to the storedvalue then display 0.0V.

l Relative percentage value ( %) =(relative value stored value) X 100%

To enter or exit and % mode:l Use rotary switch to select the desired measurement

function before selecting REL . If measurementfunctions change manually after REL is selected,the Meter exits the REL mode.

l Press REL to enter mode, and the presentmeasurement range is locked and display the lastmeasurement value as "0" as the stored value.Then if carrying out measurement at this time, theLCD will display the value as the result.

l Press REL again to enter % mode, and thepresent measurement range is locked and displaythe last measurement value as "0" as the storedvalue. Then if carrying out measurement at thistime, the LCD will display the % value as the result.

l Press REL again or turn the rotary switch to resetthe stored value and exit % and mode, returningto normal measurement mode.


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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 the Display Backlight function.

l Press to turn on the Display Backlight and it willautomatically off after about 60 seconds.

l Press and hold for about 2 seconds to turn theDisplay Backlight off.

Analogue Bar Graph Display

The analogue bar graph likes the needle in a traditionalanalogue meter (AMM). It refreshes 50 times a sec,which is 10 times faster than that of digital display andis applied to zero adjustment and observation of rapidlychanging signal that make digital display hard to read.

The analogue display is divided uniformly into 10 scalesand composed of 41 segments; of which the full-rangevalue corresponds to the full-range value of themeasurement range that has been selected. The polarityof the measured value is displayed as "-" on the left ofthe analogue display: positive polarity is not displayed.For example, when 80V range is selected, the full-rangevalue of the analogue display is 80V, and as the fullrange is uniformly divided into 10 grades, each gradedenotes 8V; If the input is 40V, the high-lighted bar-shapewill be at the position indicated by the number 5. if theinput is -40V, a "-" sign will appear on the left of theanalogue display.

There is no analogue displaying value when makingmeasurement of frequency, diode, conductance andcapacitance.


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Full Icons Display

If the Meter is turned on with any functional button beingpressed on, the LCD will display all the icons and maintainthis mode until the button is released 3 seconds later.

Sleep Mode

l To preserve battery life, the Meter automaticallyturns off if you do not turn the rotary switch or pressany button for about 30 minutes. The buzzer beepsthree times 5 minutes before turning off.

l The Meter can be activated by turning the rotaryswitch or pressing any button.If the Meter is activated by turning the rotary switch,it will start from the switch selected function.

l To disable the Sleep Mode, press while turningon the Meter.

l In MAX MIN mode, the Sleep Mode is disabled.


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l Maximum Display

l Temperature

l Relative Humidity

l Altitude

l Battery Type

l Battery Deficiencyl Data Holdingl Negative readingl Overloadingl Equipped with full icons display.l Auto and manual range selectable.l Dimensions (HxWxL)l Weight

l Safety/Compliances

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l Maximum Voltage betweenany Terminals andGrounding

:1000V rms.

:1A,250V fast type glassfuse, 5x20mm.

:8000, updates 5 times/second.

:Operating:5oC~40oC (41oF ~104oF).

Storage:-10oC~50oC (14oF~122oF).

:<80% @ 5oC - 31oC; <50% @ 31oC - 40oC.:Operating: 2000 m. Storage: 10000 m.:One piece of 9VNEDA1604 or 6F22 or006P.

:Display .:Display DATA HOLD.:Display .:Display .

:195 x 90 x 39 mm.:Approximate 550g (batteryincluded).

:

General Specifications

l

l :10A,250V fast type glass fuse, 5x20mm.

CE Version: IEC61010 CAT III1000V, CAT IV 600V overvoltageand double insulation standard.UL Version:UL 61010B-1,CAT II 1000V overvoltagedouble insulation standard.

l Certification: /ULThis meter is suitable for indoor use.




Accuracy Specifications (1)

Accuracy: (a% reading + b digits), guarantee for 1 year.Operating temperature: 23oC 5oC.Relative humidity: <80%.Temperature coefficient: 0.1 x (specified accuracy) / 1oC

A. AC Voltage

Range Resolution Accuracy50Hz~60Hz

(1%+3)

40Hz~400Hz(1.5%+4)

(1.5%+3)

(2.5%+4)

800mV8V

80V800V

1000V

100 V1mV

10mV100mV

1VOverload Protection: AC/DC: 1000V rmsRemarks:l Input impedance: 10M .l Displays effective value of sine wave (mean value

response).l Frequency response 40Hz ~ 400Hz.

B. DC VoltageRange80mV

800mV8V

80V800V

1000V

Overload Protection

AC/DC: 1000V rms

Accuracy(0.1%+3)

(0.1%+1)

Resolution10 V

100 V1mV

10mV100mV

1VRemarks:l At 80mV ~ 800mV Range:

Input impedance 4000M .l At 8V ~ 1000V Range:

Input impedance 10M .


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Approximate100

(0.5%+3)

(0.5%+1)

(2%+3)(2%+10)


C. Continuity, Resistance & Conductance Test

Continuity Test(800.0 )

8008k80k800k8M80M

Conductance Test(80nS)

0.1

0.11

101001k

10k0.01nS

Range Resolution Accuracy OverloadProtection

500V rms

Remarks:l Continuity Test (800.0 ):

Buzzer beeps continuously.Open circuit voltage approximate 0.7V.

l At 800 ~ 80M Range:Open circuit voltage approximate 0.7V.

l Conductance Test (80ns):80nS = 12.5M .

D. Capacitance


1nF10nF

100nF1 F

10 F100 F

1pF10pF

100pF1nF

10nF100nF

(3%+5)

(2%+3)

(3%+5)

500V rms

Remark:Reading under 1nF is only for reference.

E. Diodes TestRangeDiode

Resolution1mV

Overload Protection500V rms

Remarks:l Open circuit voltage approximate 3V.l Displays approximate forward voltage drop reading.


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F. DC Current


(0.3%+2)

80mA

800mA

8A

10A

10 A

100 A

1mA

10mA

Remark:l At 8A & 10A Range:

For continuous measurement 10 seconds andinterval time between 2 measurements greater than15 minutes.

G. AC Current


(0.8%+2)

(1.2%+2)

80mA

800mA

8A

10A

10 A

100 A

1mA

10mA

Remarks:l At 8A & 10A Range:

For continuous measurement 10 seconds andinterval time between 2 measurements greater than15 minutes.

l Displays effective value of sine wave (mean valueresponse).

l Frequency response 40Hz ~ 1kHz.

1A,250V fast typeglass fuse, 5x20mm.





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H. Frequency & Duty CycleFrequency - At mV Range

Remarks:l Input sensitivity as follows:

<100kHz: 100mV rms;100kHz: 500mV rms;

l Maximum input amplitude: 30V rms.

Frequency - At V & V Range


500V rms(0.02%+1)

0.01Hz0.1Hz1Hz

10Hz

1kHz10kHz

100kHz1MHz

Range Accuracy Overload Protection1000V(0.1%+3)10Hz~100kHz

Remarks:l Input amplitude: 500mV rms.l Maximum input amplitude: 30V rms.

Frequency - At A & mA Range

Remark:l Input amplitude: 3000 digits.

Duty Cycle

Range Accuracy Overload Protection

(0.1%+3)50Hz ~ 10kHz

Range Resolution Accuracy OverloadProtection500V rms(1%+5)0.01%1% ~ 99%




40



Maintenance (1)

This 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, donot get water inside the case.

A. General Service

l Periodically wipe the case with a damp cloth andmild detergent. Do not use abrasives or solvents.

l To clean the terminals with cotton bar with detergent,as dirt or moisture in the terminals can affect readings.

l Turn the Meter to OFF position when it is not in useand take out the battery when not using for a longtime.

l Do not store the Meter in a place of humidity, hightemperature, explosive, inflammable and strongmagnetic field.

Remarks:l Reading is only for reference purpose.l At mV 8V Range:

Positive pulse width 30 s.



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Maintenance (2)

B. Testing the Fuses

WarningTo avoid electrical shock or personal injury, removethe test leads and any input signals before replacingthe battery or fuse.To prevent damage or injury, install ONLY replacementfuses with identical amperage, voltage, and speedratings.

To test the fuse:

1. Set the rotary switch to and select bypressing .

2. Plug a test lead into the terminal V Hz and touchthe probe tip to the 10A or mA terminal.l If the Meter beeps, the fuse is good.l If the display shows , replace the fuse and test

again.l If the display shows any other value, have the

Meter serviced and contact your dealerimmediately.

If the Meter does not work while the fuse is all right, sendit to your dealer for repair.


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

To replace the battery:

1. Turn the Meter to OFF position and remove allconnections from the terminals.

2. Take out the Meter from the holster.3. Remove the 3 rubber feet and then 3 screws from

the case bottom, and separate the case top fromthe case bottom.

4. Remove the battery from the battery connector.5. Replace the battery with a new 9V battery

(NEDA1604, 6F22 or 006P).6. Rejoin the case bottom and case top, and reinstall

the 3 screws and 3 rubber feet.

(figure 15)

Maintenance (3)

C. Replacing the Battery (see figure 15)

The Meter

Holster


43



Maintenance (4)

D. Replacing the Fuses (see figure 15)

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. Turn the Meter to OFF position and remove allconnections from the terminals.

2. Take out the Meter from the holster.3. Remove the 3 rubber feet and 3 screws from the

case bottom, and separate the case top from thecase bottom.

4. Remove the 4 screws fixing the PCB on the inputterminals, gently take apart the PCB and reverse it.

5. Remove the fuse by gently prying one end loose,then take out the fuse from its bracket.

6. Install ONLY replacement fuses with the identicaltype and specification as follows and make sure thefuse is fixed firmly in the bracket.Fuse 1:

Fuse2:7. Rejoin the PCB and the case top, and reinstall the

4 screws.8. Rejoin the case bottom and case top, and reinstall

the 3 screws and 3 rubber feet.

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

1A,250V fast type glass fuse, 5x20mm.10A,250V fast type glass fuse, 5x20mm.


44



Receiving DataTransmitting Data

Data Terminal ReadyGrounding

Data Set ReadyRequest to Send

Clear to Send

RXTX

DTRGNDDSRRTSCTS

32

207645

2345678

2345678

RS232C Serial Port (1)

A. RS232C Port CableThe

Meter Computer

D-sub9 Pin Male

D-sub9 Pin

Female

D-sub25 PinFemale

PinName Remark

B. Setting of RS232C Serial Ports

Default of RS232C serial port for communication is setas:Baud Rate 9600Start bit 1 (always 0)Stop bit 1 (always 1)Data bits 8Parity Odd None


45



RS232C Serial Port (2)

C. System Requirements for Installing the UT70CInterface Program

To use UT70C Interface Program, you need the followinghardware and software:l An IBM PC or equivalent computer with 80586 or

higher processor and 640 x 480 pixel or bettermonitor.

l Microsoft Windows 95 or above.l At least 16 MB of RAM.l At least 8MB free space in hard drive.l Can access to a local or a network CD-ROM.l A free serial port.l A mouse or other pointing device supported by

Windows.

Please refer to the included CD-ROM "Installation Guide& Computer Interface Software" for installing andoperating instructions of the UT70C Interface Program.

~ END ~This operating manual is subject to change without notice.


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Manufacturer: UNI-TREND TECHNOLOGY(DONG GUAN)LIMITEDAddress: Dong Fang Da Dao, Bei Shan Dong Fang Industrial Development District, Hu Men Town, Dong Guan City, Guang Dong Province, ChinaHeadquarters: Uni-Trend International LimitedAddress: Rm901, 9/F, Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon, Hong KongTel: (852) 2950 9168Fax: (852) 2950 9303Email: [email protected]://www.uni-trend.com

Copyright 2001 Uni-Trend International Limited.All rights reserved.


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ut70c

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