Unit UT39A Manuale utente

TABLE OF CONTENTS

TITLE PAGE

Overview

Unpacking Inspection

Safety Information

Rules For Safe Operation

International Electrical Symbols

The Meter Structure

Functional Buttons

Display Symbols

Measurement Operation

A. DC Voltage Measurement

B. AC Voltage Measurement

C. DC Current Measurement

D. AC Current Measurement

E. Measuring Resistance

F. Frequency Measurement (The Model UT39C only)

G.TemperatureMeasurement (TheModel UT39Conly)

H. Capacitance Measurement

I. Measuring Diodes & Continuity

J. Measuring Transistor

Sleep Mode

General Specifications

Accuracy Specifications

A. DC Voltage

B. AC Voltage

C. DC Current

D. AC Current

E. Resistance Test

F. Frequency (The Model UT39C only)

G. Temperature (The Model UT39C only)

H. Capacitance

Model UT39A/B/C: OPERATING MANUAL

PAGE

I. Diodes and Continuity Test

J. Transistor Test

Maintenance

A. General Service

B. Replacing the Battery

C. Replacing the Fuses

Model UT39A/B/C: OPERATING MANUAL

Overview

Warning

To avoid electric shock or personal injury, read the

“Safety Information” and “Rules for Safety Operation”

carefully before using the Meter.

Digital Multimeters Model UT39A, UT39B and UT39C

(hereafter referred to as “the Meter”) are 3 1/2 digits with

steady operations, fashionable structure and highly

reliable hand-held measuring instrument. The Meter uses

large scale of integrated circuit with double integrated

A/D converter as its core and has full range overload

protection. The Meter not only can measure AC/DC

Voltage, AC/DC Current, Resistance, Capacitance,

Temperature, Transistor, Frequency, Diodes and

Continuity, but also has Data Hold and Sleep Mode

features.

The Meter comes with a holster which can provide

sufficient and anti-shaking.

Unpacking Inspection

Open the package case and take out the Meter. Check

the following items carefully to see any missing or

damaged part:

Item Description Qty

English Operating Manual

Test Lead

Point Contact Temperature Probe

(UT39C only)

Holster

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

1 piece

1 pair

1 piece

In the event you find any missing or damage, please

contact your dealer immediately.

Model UT39A/B/C: OPERATING MANUAL

Safety Information

This Meter complies with the standards IEC61010: in

pollution degree 2, overvoltage category (CAT. I 1000V,

CAT. II 600V) and double insulation.

CAT. I: Signal level, special equipment or parts of

equipment, telecommunication, electronic, etc., with

smaller transient overvoltages than overvoltages CAT. II.

CAT. II: Local level, appliance, PORTABLE EQUIPMENT

etc., with smaller transient voltage overvoltages than

CAT. III

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 7.

Model UT39A/B/C: OPERATING MANUAL

Rules For Safe Operation

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:

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.

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.

Do not apply more than the rated voltage, as marked

on the Meter, between the terminals or between

any terminal and grounding.

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.

When the Meter working at an effective voltage

over 60V in DC or 30V rms in AC, special care

should be taken for there is danger of electric

shock.

Use the proper terminals, function, and range for

your measurements.

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.

When using the test leads, keep your fingers behind

the finger guards.

Disconnect circuit power and discharge all high-

voltage capacitors before testing resistance,

Model UT39A/B/C: OPERATING MANUAL

continuity, diodes, capacitance or current.

Before measuring current, check the Meter’s fuses

and turn off power to the circuit before connecting

the Meter to the circuit.

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.

Remove test leads and temperature probe from

the Meter and turn the Meter power off before

opening the Meter case.

When servicing the Meter, use only the same model

number or identical electrical specifications

replacement parts.

The internal circuit of the Meter shall not be altered

at will to avoid damage of the Meter and any

accident.

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.

The Meter is suitable for indoor use.

Turn the Meter power off when it is not in use and

take out the battery when not using for a long time.

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 UT39A/B/C: OPERATING MANUAL

Deficiency of Built-In Battery

AC (Alternating Current)

AC or DC

Double Insulated

Warning. Refer to the Operating Manual

Conforms to Standards of European Union

Grounding

DC (Direct Current)

Diode

Continuity Test

Fuse

International Electrical Symbols

The Meter Structure (see figure 1)

1. LCD Display

2. Data Hold Button

3. Transistor Jack

4. COM Input Terminal

5. Other Input Terminals

6. mA Input Terminal

7. 20A/10A Input Terminal

8. Capacitance Jack

9. Rotary Switch

10. Power ( figure 1)

Model UT39A/B/C: OPERATING MANUAL

Button

POWER

(Yellow Button)

HOLD

(Blue Button)

Operation Performed

Turn the Meter on and off.

Press down the POWER to turn on the Meter.

Press up the POWER to turn off the Meter.

Press HOLD once to enter hold mode.

Press HOLD again to exit hold mode.

In Hold mode, is displayed and the

present value is shown.

Functional Buttons

Below table indicated for information about the functional

button operations

Display Symbols (see figure 2)

( figure 2)

Symbol

hFE

No.

Meaning

Data hold is active.

Indicates negative reading.

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.

Unit of Transistor

Centigrade temperature

Test of diode.

The continuity buzzer is on.

Dangerous Voltages.

Model UT39A/B/C: OPERATING MANUAL

Make sure the Sleep Mode is not on if you found there

is no display on the LCD after turning on the Meter.

Make sure the Low Battery Display is not on,

otherwise false readings may be provided.

Pay extra attention to the symbol which is located

besides the input terminals of the Meter before carrying

out measeurement.

A. DC 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 or 750V rms although

readings may be obtained.

Take extra attention when measuring high voltages

to avoid electric shock.

To measure DC voltage, connect the Meter as follows:

1. Insert the red test lead into the VΩinput terminal and

the black test lead into the COM input terminal.

2. Set the rotary switch to an appropriate measurement

position in Vrange.

3. Connect the test leads across with the object being

measured.

The measured value shows on the display.

( figure 3)

Black Red

Model UT39A/B/C: OPERATING MANUAL

Measurement Operation

Note

If the value of voltage to be measured is unknown,

use the maximum measurement position (1000V) and

reduce the range step by step until a satisfactory

reading is obtained.

The LCD displays “1” indicating the existing selected

range is overloaded, it is required to select a higher

range in order to obtain a correct reading.

In each range, the Meter has an input impedance of

approx. 10MΩ.This loading effect can cause

measurement errors in high impedance circuits. If the

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

error is negligible (0.1% or less).

When DC voltage measurement has been completed,

disconnect the connection between the testing leads

and the circuit under test.

B. AC Voltage Measurement (see figure 3 with dotted line)

Warning

To avoid harms to you or damages to the Meter from

electric shock, please do not attempt to measure

voltages higher than 1000V or 750V rms although

readings may be obtained.

Take extra attention when measuring high voltages

to avoid electric shock.

To measure AC Voltage, connect the Meter as follows:

1. Insert the red test lead into the VΩ terminal and the

black test lead into the COM terminal.

2. Set the rotary switch to an appropriate measurement

position in V range.

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).

Model UT39A/B/C: OPERATING MANUAL

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