Tenma 72-7720 Manuale utente

Page

Model 72-7720/72-7725: OPERATING MANUAL

Table of Contents

Title

Overview

Unpacking Inspection

Safety Information

Rules For Safe Operation

International Electrical Symbols

The Multimeter 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. Model 72-7725:

Frequency Measurement

G. Model 72-7725:

Temperature Measurement

H. Capacitance Measurement

I. Measuring Diodes & Continuity

General Specifications

Testing for Continuity

Sleep Mode

Turning on the Auto Display Backlight

Accuracy Specifications

A. DC Voltage

B. AC Voltage

C. DC Current

D. AC Current

Page

I. Diodes and Continuity Test 30

C. Replacing the Fuses

Model 72-7720/72-7725: OPERATING MANUAL

Title

E. Resistance Test

F. Model 72-7725: Frequency

G. Model 72-7725:

Temperature

H. Capacitance

Maintenance

A. General Service

B. Replacing the Battery

Overview

Warning

To avoid electric shock or personal injury, read the

"Safety Information" and "Rules for Safe Operation"

carefully before using the Meter.

Digital Multimeters Model 72-720 and 72-7725 (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, Frequency, Diodes and Continuity, but also

has Data Hold, Full Icon Display and Sleep Mode features.

The Meter adopted advanced “co-injection” technique in

order to provide sufficient insulation and anti-shaking.

In addition, the Automatic Display Backlight feature

enables user to work in a dim condition.

Model 72-7720/72-7725: OPERATING MANUAL

Unpacking Inspection

Open the package case and take out the Meter. Check

the following items carefully for missing or damaged

parts:

In the event you find items missing or damaged, please

contact your dealer immediately.

Model 72-7720/72-7725: OPERATING MANUAL

Item

Description

English Operating Manual

Test Lead

Test Clip

Point Contact Temperature Probe

(72-7725 only)

Qty

1 piece

1 pair

1 piece

Safety Information

This Meter complies with the standards IEC61010: in

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

CAT. III 600V) and double insulation.

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

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 to.

International electrical symbols used on the Meter and

in this Operating Manual are explained on page 8.

Model 72-7720/72-7725: OPERATING MANUAL

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 ground.

l The rotary switch should be placed in the correct

position and no changeover of range shall be

made during measurement, to prevent damage

of the Meter.

l When working at an effective voltage over 60V

DC or 30V rms AC, special care should be taken

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,

flammable 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 72-7720/72-7725: OPERATING MANUAL

Rules For Safe Operation (2)

l Disconnect circuit power and discharge all high-

voltage capacitors before testing resistance,

continuity, diodes, capacitance or current.

l Before measuring current, check the Meter’s

fuses and turn off power to the circuit before

connecting the Meter .

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, test clips and temperature

probe 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 only for indoor use.

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

and take out the battery when not using for a

long time.

l Periodically check the battery as it may leak

after some time.If leakage is apparent,the battery

should be immediately replaced to prevent

damage.

Model 72-7720/72-7725: OPERATING MANUAL

International Electrical Symbols

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 72-7720/72-7725: OPERATING MANUAL

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