Tenma 72-7224 Manuel utilisateur

Digital Clamp Multimeters

72-7224 / 72-7226

Table of Contents

Overview

Inspection

Safety Information

Rules For Safe Operation

International Electrical Symbols

The Meter Structure

Rotary Switch

Function Buttons

Button Use

Display Symbols

Measurement Operation

A. DC/AC Voltage Measurement

B. Measuring Resistance

C. Testing Diodes

D. Testing for Continuity

E. Frequency Measurement

F. Duty Cycle Measurement

G. DC/AC Current Measurement

Title Page

Model 72-7224 / 72-7226: OPERATING MANUAL

Sleep Mode

Specifications

A. General Specifications

B. Environmental Requirements

Accuracy Specifications

A. DC Voltage

B. AC Voltage

C. Resistance

D. Diode Test

E. Continuity Test

F. Frequency

G. Duty Cycle

H. DC Current

I. AC Current

Maintenance

A. General Service

B. Replacing the Battery

Title Page

Model 72-7224 / 72-7226: OPERATING MANUAL

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.

Digital Clamp Multimeter Models 72-7224 and 72-7226 (hereafter referred to as “the

Meter”) are 3 3/4 digits with precise operation, fashionable structure and highly reliable

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.

Both models measure AC/DC Voltage, AC/DC Current, Frequency, Duty Cycle,

Resistance, Diodes and Continuity, and also include Data Hold, Sleep Mode and

Relative Mode features.

Model 72-7226 also provides True RMS measurement.

Model 72-7224 / 72-7226: OPERATING MANUAL

Inspection

Open the package case and take out the Meter. Check the following items carefully

to see if any items are missing or damaged.

Item Description Qty

English Operating Manual

Test Lead

Carrying Bag

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

1 piece

1 pair

1 piece

In the event you find any items missing or damaged, please contact your dealer

immediately.

Model 72-7224 / 72-7226: OPERATING MANUAL

Safety Information

This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage

category (CAT. II 600V, CAT. III 300V) and double insulation.

CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient

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 9.

Model 72-7224 / 72-7226: 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 ground. If the value to be measured is

unknown, use the maximum measurement position and reduce the range step

by step until a satisfactory reading is obtained.

When measurement has been completed, disconnect the connection between

the test leads and the circuit under test, remove the test leads away from the

input terminals of the Meter and turn the Meter power off.

Model 72-7224 / 72-7226: OPERATING MANUAL

The rotary switch should be placed in the correct position and no change of

range made during measurement, to prevent damage to the Meter.

Do not carry out the measurement when the Meter’s back case and battery

compartment are not closed to avoid electric shock.

Do not input higher than 600V between the two Meter’s input terminal to avoid

electric shock and damages to the Meter.

When working at an effective voltage over 60VDC or 30VAC RMS, 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, continuity and diode.

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.

When servicing the Meter, use only the same model number or identical electrical

specifications replacement parts.

Model 72-7224 / 72-7226: OPERATING MANUAL

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 off when it is not in use and take out the battery when not using

for a long time.

Periodically check the battery as it may leak after some time. If leakage is apparent,

the battery should be immediately replaced to prevent damage to the

Meter.

Model 72-7224 / 72-7226: OPERATING MANUAL

International Electrical Symbols

AC (Alternating Current)

DC (Direct Current)

AC or DC

Ground

Double Insulated

Warning. Refer to the Operating Manual

Low Battery

Continuity Test

Diode

Fuse

Application around and removal from HAZARDOUS LIVE

conductors is permitted.

Conforms to Standards of European Union

Model 72-7224 / 72-7226: OPERATING MANUAL

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