Uni-Trend UT70C Datasheet

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Table of Contents

Title

Overview

Unpacking Inspection

Safety Information

Rules For Safe Operation

International Electrical Symbols

The Meter Structure

Rotary Switch

Functional Buttons

Display Symbols

Measurement Ranges

A. Selecting a Measurement Range

B. Manual Ranging and Autoranging

Measurement Operation

A. AC Voltage Measurement

B. DC Voltage Measurement

C. DC Milivolt Measurement

D. Measuring Continuity, Resistance,

Conductance & Capacitance

E. Testing Diodes

F. DC or AC Current Measurement

G. Frequency & Duty Cycle Measurement

MAX MIN Recording Mode

PEAK MAX MIN Mode

Operation of Hold Mode

Operation of Auto Hold Mode

The Use of Relative Value and Relative

Percentage Value Mode

Turning on the Display Backlight

Analogue Bar Graph Display

Full Icons Display

Sleep Mode

General Specifications

Model UT70C: OPERATING MANUAL

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Accuracy Specifications

A. AC Voltage

B. DC Voltage

C. Continuity, Resistance &

Conductance Test

D. Capacitance

E.

Diodes Test

F.

DC Current

G.

AC Current

H. Frequency & Duty Cycle

Maintenance

A. General Service

B. Testing the Fuses

C. Replacing the Battery

D. Replacing the Fuses

RS232C Serial Port

A. RS232C Port Cable

B. Setting of RS232C Serial Ports

C. System Requirements for Installing the

UT70C Interface Program

Model UT70C: OPERATING MANUAL

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Overview

This Operating Manual covers information on safety and

cautions. Please read the relevant information carefully

and observe all the Warnings and Notes strictly.

Warning

To 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 precise

instrument with a resolution of 8,000 counts and up-to-

date automatic computer calibrating function. High

resolution A/D converter and micro-controller data

processing technique is adopted in the Meter, featured

with intelligence, high precision and multi-functions. The

Meter can be widely used in laboratory, field service,

domestic and other applications. All the functions and

ranges have overloaded protection.

Model UT70C: OPERATING MANUAL

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Unpacking Inspection

Open the package case and take out the Meter. Check

the following items carefully to see any missing or

damaged part:

In the event you find any missing or damage, please

contact your dealer immediately.

Item

1

2

3

4

5

6

7

8

Description

Operating Manual

Test Lead

Test Clip

9V Battery (NEDA1604, 6F22 or 006P)

(installed)

RS232C Interface Cable

CD-ROM (Installation Guide & Computer

Interface Software)

Holster

Tilt Stand

Qty

1 piece

1 pair

1 piece

Model UT70C: OPERATING MANUAL

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Safety Information

CAT. II: Local level, appliance, PORTABLE EQUIPMENT

etc., with smaller transient voltage overvoltages than

CAT. III

CAT. III: Distribution level, fixed installation, with smaller

transient 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 be

impaired.

In this manual, a Warning identifies conditions and

actions that pose hazards to the user, or may damage

the Meter or the equipment under test.

A Note identifies the information that user should pay

attention on.

International electrical symbols used on the Meter and

in this Operating Manual are explained on page 8.

Model UT70C: OPERATING MANUAL

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CE Version: The Meter complies with the standards

IEC61010-1:in pollution degree 2, overvoltage category

CAT 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 1000V

and double insulation.

Rules For Safe Operation (1)

Warning

To avoid possible electric shock or personal injury,

and to avoid possible damage to the Meter or to the

equipment under test, adhere to the following rules:

l Before using the Meter inspect the case. Do

not use the Meter if it is damaged or the case

(or part of the case) is removed. Look for cracks

or missing plastic. Pay attention to the insulation

around the connectors.

l Inspect the test leads for damaged insulation

or exposed metal. Check the test leads for

continuity. Replace damaged test leads with

identical model number or electrical

specifications before using the Meter.

l Do not apply more than the rated voltage, as

marked on the Meter, between the terminals or

between any terminal and grounding.

l The rotary switch should be placed in the right

position and no any changeover of range shall

be made during measurement is conducted to

prevent damage of the Meter.

l Never working at an effective voltage over 60V

in DC or 30V rms in AC for there is danger of

electric shock.

l Use the proper terminals, function, and range

for your measurements.

l Do not use or store the Meter in an environment

of high temperature, humidity, explosive,

inflammable and strong magnetic field. The

performance of the Meter may deteriorate after

dampened.

l When using the test leads, keep your fingers

behind the finger guards.

Model UT70C: OPERATING MANUAL

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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, or

capacitance.

l Before measuring current, check the Meter's

fuses and turn off power to the circuit before

connecting the Meter to the circuit.

l Replace the battery as soon as the battery

indicator

appears. With a low battery, the

Meter might produce false readings that can

lead to electric shock and personal injury.

l Remove test leads, RS232C interface cable and

test clip from the Meter and turn the Meter power

off before opening the Meter case.

l When servicing the Meter, use only the same

model number or identical electrical

specifications replacement parts.

l The internal circuit of the Meter shall not be

altered at will to avoid damage of the Meter and

any accident.

l Soft cloth and mild detergent should be used

to clean the surface of the Meter when servicing.

No abrasive and solvent should be used to

prevent 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 long

time.

l Constantly check the battery as it may leak when

it has been using for some time, replace the

battery as soon as leaking appears. A leaking

battery will damage the Meter.

Model UT70C: OPERATING MANUAL

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International Electrical Symbols

The Meter Structure (see figure 1)

(figure 1)

1 Front Case

2 LCD Display

3 Functional Buttons

4 Rotary Switch

5 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

Model UT70C: OPERATING MANUAL

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mV

V

OFF

V

Rotary Switch

Below table indicated for information about the rotary

switch positions.

Rotary

Switch

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 Measurement

from 0.001A to 10.00A .

AC or DC Current Measurement

from 0.1mA to 800.0mA.

A

mA

Model UT70C: OPERATING MANUAL

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Functional Buttons (1)

Below table indicated for information about the functional

button operations.

Button Operation PerformedMeasuring

Function

Continuity

Test

Turn the continuity buzzer on and

off in resistance measurement

mode.

At OFF

position

At REC

mode or

REC mode

plus Hold

mode

Press while turning on the

Meter to disable the beeper at all

functions except short circuit and

diode testing.

To toggle between 100ms

response time and 1ms response

time under REC mode except at

resistance, capacitance and

continuity range.

MAX

MIN

Any rotary

switch

position

except at

conductance

mode.

Starts recording of maximum and

minimum values. Steps the

display through the sequence of

present, high (MAX), low (MIN)

and average (AVG) readings at

any mode.

In 1ms response time, it steps

through only MAX and MIN

reading.

At OFF

position

To select 1 second high accuracy

response time, press and hold

down MAX MIN while turning the

rotary switch to any function

setting.

RANGEAny rotary

switch

position

1. Press RANGE to enter the

manual ranging mode; the

Meter beeps.

2. Press RANGE to step

through the ranges available

for the selected function; the

Meter beeps.

3. Press and hold RANGE for

over 1 second to return to

autoranging; the Meter

beeps.

Model UT70C: OPERATING MANUAL

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HOLD Any rotary

switch

position

Press HOLD to enter and exit the

Hold mode in any mode; the

Meter beeps.

Functional Buttons (2)

Conductance

mode

Press HOLD to toggle between

conductance and resistance

value. Present resistance value

is kept.

Press to select capacitance

test.

A , mA Press to select DC or AC

current. DC is default.

At OFF

position

To disable the Sleep Mode, press

while turning on the Meter.

REL

Any rotary

switch

position

Press REL

to enter and exit the

and

% mode in any measuring

mode; the Meter beeps.

Hz V , V ,

mV

, A ,

mA

1. Press Hz to enter frequency

measurement mode; the

Meter beeps.

2. Press Hz again to enter duty

cycle measurement mode;

the Meter beeps.

3. Press Hz again to return to

the last measurement mode;

the Meter beeps.

Display

Backlight

Press once to turn the Display

Backlight on and it shall shut off

automatically in around 60

seconds later.

Model UT70C: OPERATING MANUAL

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No. MeaningSymbol

Display Symbols (1) (see figure 2)

(figure 2)

1

The Meter is in the auto range mode in

which the Meter automatically selects the

range with the best resolution.

2

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.

3

Indicates negative reading.

4

Test of diode.

5

The continuity buzzer is on.

6

The relative value mode is on, which

display the present value minus the stored

value.

%

7

The relative percentage value mode is

on. It displays the percentage value of

the relative value and stored value.

DATA

HOLD

8

Data hold is active.

DC AC Indicator for DC/AC voltage or current.

The displayed value is the mean value.

9

Display the present chosen range.8000mV

10

Percent, used for duty cycle

measurements.

%

11

Model UT70C: OPERATING MANUAL

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V, mV

Display Symbols (2)

12

,

k , M

W: Ohm. The unit of resistance.

kW: kilohm. 1 x 10

3

or 1000 ohms.

MW: Megohm. 1 x 10

6

or 1,000,000

ohms.

Hz, kHz,

MHz

Hz: Hertz. The unit of frequency.

kHz: Kilohertz. 1 x 10

3

or 1000 hertz.

MHz: Meghertz. 1 x 10

6

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 average

recording mode enabled. Present reading

displayed.

13

100ms response time.

Maximum reading displayed.

Minimum reading displayed.

Average reading displayed.

14

Provides an analogue indication of the

present input, quick response.

15

Polarity indicator for the analogue bar

graph display, no display for positive.

The input value is too large for the selected

range.

16

Computer and the Meter is connected

properly. Data output is in progress.

17

A, mA

F, F, nF

nS

100ms

MAX

MIN

AVG

Analogue

Bar

Graph

RS232C

K :

M :

:

Model UT70C: OPERATING MANUAL

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Measurement Ranges (1)

A measurement range determines the highest value the

Meter can measure. Most Meter functions have more

than 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 display

the 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 best

range for the input detected.

This allows you to switch test points without having

to reset the range.

l In the manual range mode, you select the range.

This allows you to override autorange and lock the

Meter in a specific range.

The Meter defaults to the autorange mode in

measurement functions that have more than one range.

When the Meter is in the autorange mode, is

displayed.

To enter and exit the manual range mode:

Model UT70C: OPERATING MANUAL

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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 Meter

wraps to the lowest range.

2. To exit the manual range mode, press and hold

RANGE for over one second.

The Meter returns to the autorange mode and

is displayed.

Note

l In Hold and MAX MIN mode, press RANGE exits

these measurement modes and enters manual

range mode.

l In Hz measurement mode, press RANGE to attenuate

10 times of input signal amplitude which can increase

the Meter sensitivity and stabilize the correct reading.

Measurement Ranges (2)

Model UT70C: OPERATING MANUAL

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Measurement Operation (1)

A. AC Voltage Measurement (see figure 3)

Warning

To avoid harms to you or damages to the Meter from

electric shock, please do not attempt to measure

voltages higher than 1000V / 750V rms although

readings may be obtained.

The AC Voltage ranges are: 800.0mV, 8.000V, 80.00V,

800.0V and 1000V. To measure AC Voltage, connect

the Meter as follows:

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 V

.

3. Connect the test leads across with the object being

measured.

The measured value shows on the display, which

is effective value of sine wave (mean value

response).

Note

l In each range, the Meter has an input impedance

of 10M . This loading effect can cause

measurement errors in high impedance circuits. If

the 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 leads

and the circuit under test.

(figure 3)

blackred

Model UT70C: OPERATING MANUAL

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(figure 4)

B. DC Voltage Measurement (see figure 4)

Measurement Operation (2)

Warning

To avoid harms to you or damages to the Meter from

electric shock, please do not attempt to measure

voltages higher than 1000V / 750V rms although

readings may be obtained.

The DC Voltage ranges are: 8.000V, 80.00V, 800.0V and

1000V. To measure DC Voltage, connect the Meter as

follows:

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 V

.

3. Connect the test leads across with the object being

measured.

The measured value shows on the display.

Note

l In each range, the Meter has an input impedance

of 10M . This loading effect can cause

measurement errors in high impedance circuits. If

the circuit impedance is less than or equal to 10k ,

the error is negligible (0.1% or less).

l When DC voltage measurement has been completed,

disconnect the connection between the testing leads

and the circuit under test.

blackred

Model UT70C: OPERATING MANUAL

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(figure 5)

Measurement Operation (3)

C. DC Millivolt Measurement (see figure 5)

Warning

To avoid harms to you or damages to the Meter from

electric shock, please do not attempt to measure

voltages higher than 1000V / 750V rms although

readings may be obtained.

The DC Millivolt ranges are: 80.00mV and 800.0mV.

These ranges have more than 4000M . To measure

DC Millivolt, connect the Meter as follows:

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 mV

.

3. Connect the test leads across with the object being

measured.

The measured value shows on the display.

Note

l In each range, the Meter has an input impedance

of 10M . This loading effect can cause

measurement errors in high impedance circuits. If

the circuit impedance is less than or equal to 10k ,

the error is negligible (0.1% or less).

l When DC millivolt measurement has been completed,

disconnect the connection between the testing leads

and the circuit under test.

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Model UT70C: OPERATING MANUAL

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(figure 6)

Measurement Operation (4)

D. Measuring Continuity, Resistance,

Conductance & Capacitance

Warning

To avoid damages to the Meter or to the devices

under test, disconnect circuit power and discharge

all the high-voltage capacitors before measuring

continuity, resistance, conductance and capacitance.

When measuring capacitance, use the DC Voltage

function to confirm that the capacitor is discharged.

Never attempt to input over 60V in DC or 30V rms in

AC 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 .

Note

l The LCD displays

indicating the circuit being

tested is open.

l When continuity testing has been completed,

disconnect the connection between the testing leads

and the circuit under test.

Select

Test

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Model UT70C: OPERATING MANUAL

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(figure 7)

Resistance Measurement (see figure 7)

Measurement Operation (5)

The resistance ranges are: 800.0 , 8.000k , 80.00k ,

800.0k , 8.000M and 80.00M . To measure

resistance, connect the Meter as follows:

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

, resistance

measurement is default or press

to select

measurement mode.

3. Connect the test leads across with the object being

measured.

The measured value shows on the display.

Note

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

resistance measurement. To obtain precision

readings in low-resistance measurement, that is the

range of 800.0 , short-circuit the input terminals

beforehand, using the relative value function button

REL

to automatically subtract the value measured

when the testing leads are short-circuited from the

reading.

l For high-resistance measurement (>1M ), it is normal

taking several seconds to obtain a stable reading.

Select

W Test

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Model UT70C: OPERATING MANUAL

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