Owon CM240 Manual de usuario

Digital Clamp Meter

User Manual

CM240

WWW.OWON.COM.CN

Mar. 2016 edition V1.2

The LILLIPUT's products are under the protection of the patent rights, including ones which have already

obtained the patent rights and those which are applying for. The information in this manual will replace all

that in the materials published originally.

The information in this manual was correct at the time of printing. However, LILLIPUT will continue to

improve products and reserves the rights to change specification at any time without notice.

is the registered trademark of the LILLIPUT Company.

Fujian LILLIPUT Optoelectronics Technology Co., Ltd.

No. 19, Heming Road

Lantian Industrial Zone, Zhangzhou 363005 P.R. China

Tel: +86-596-2130430 Fax: +86-596-2109272

Web: www.owon.com.cn E-mail: info@owon.com.cn

Table of Contents

Instruction ..................................................... 1

Check the Accessories ................................... 1

Safety Information.........................................1

Electrical Symbols..........................................3

Front Panel Description ................................. 3

LCD Display Symbols......................................4

Button Function and Auto Power Off ............4

Making Measurements..................................5

Measuring DC Voltage ................................................... 5

Measuring AC Voltage..................................................... 6

Measuring Resistance.................................................... 7

Testing Diode .................................................................. 7

Testing Continuity ........................................................... 8

Measuring AC Current.................................................... 9

General Specifications...................................9

Electrical Specifications ...............................10

Replacing the Batteries................................12

Instruction

CM240 digital clamp meter is a

- digit LCD multi-meter with

steady operations, 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. The meter can

perform measurements of AC and DC voltage, AC current,

resistance, diode and continuity test.

Warning

To avoid electric shock or personal injury, read the “Safety

Information" and "Safety Warning" carefully before using

the meter.

Check the Accessories

Open the package case and take out the Meter. Check

the following items carefully to see any missing or

damaged part:

Item

Description

Quantity

User Manual

1 piece

Test Lead

1 pair

In the event you find any missing or damage, please

contact your dealer immediately.

Safety Information

Thisdigitalclampmeterhasbeendesignedaccordingsafety

standard IEC-61010-I and LECI010-2-032 concerning

electronic

measuring instruments with an

over voltage

category (CAT II 600V)

and pollution degree 2.

Safety Warning

Safety Information

Read the operating instructions before using the instrument

and pay particular attention to all WARNINGS and

CAUTIONS in this instruction manual.

Be sure that the cover and the test leads of the meter are in

good conditions.

Set the range / function switch at the correct position when

measuring.

Make sure to insert the red and the black test leads to their

appropriate jacks. The black test lead should be connected

first when measuring while the red test lead should be

disconnected first after measuring.

When the range and function changes, both test leads

should be disconnected.

To avoid damage to the instrument, never exceed the

allowable maximum input of each range.

Be care of electric shock hazard when the voltage to be

tested is above DC 60V or AC 30V.

To avoid electric shock, do not open the battery

compartment cover when making measurement.

Remove the test leads from the circuit being measured

before replacing the battery.

10.

Do not change the built-in circuit to avoid damage to the

meter.

11.

Do not use or store the instrument in an explosive

atmosphere (i.e. the presence of flammable gas or fume,

vapor or dust).

12.

CAT II-Measurement Category II is for measurements

performed on circuits directly connected to low voltage

installation.CExamples are measurements on household

appliances, portable tools and similar equipments.)Dot not

use the meter for measurements within Measurement

Categories III and IV.

Electrical Symbols

Warning

Earth

Ground

Double

insulated

(Protection

classII

)

Alternating

signal test

Direct

signal

test

Continuity

buzzer

Diode test

Low Battery

AC or DC

Conforms to European Union directives

Application around and removal from

HAZARDOUS LIVE conductors is permitted.

Capacitor

Front Panel Description

Input Terminals

LCD Display

Functional Buttons

(SEL/MAX/HOLD

)

Rotary Switch

Trigger: press the lever to open the

transformer jaw.

Hand Guards: to protect user's hand

from touching the dangerous area.

Transformer Jaw: designed to pick up

the AC and DC current flowing through

the conductor. It could transfer current

to voltage. The tested conductor must

vertically go through the Jaw center.

LCD Display Symbols

Alternating signal test

Direct signal test

Low Battery

Auto range mode

Diode test

Continuity buzzer

The maximum value is

being measured

This indicates that the

display data is being held

Ohms, kilo-ohms, mega-ohms resistance test

10.

Amperes (current)

11.

Milli-volts, volts (voltage)

12.

Negative polar mark

13.

"OL": The input value is too large for the selected range.

Button Function and Auto Power Off

H: For measuring data hold, press the H button, the peak value

of current data will be keeping displaying on LCD; press it again

to cancel this function.

MAX: Maximum data hold button, when press this button, the

A/D converter will keep measuring, and the display updating the

data and hold the maximum data.

SEL: Function selection button, press for switching

ohm/diode/continuity function when tested objects change.

Auto-power off : If there is no any operation within any fifteen

minutes after power is on, the meter will auto power off. Turn the

rotary switch or press any function button to resume operation of

the meter under the auto power off mode. At the same time

when power on, if press the "H" button, auto power off will be

disabled.

Making Measurements

Note:

After automatic turn-off, then press Hto re-start, the function of

automatic turn-off will be cancel.

Buzzer

Set the selector to any measuring function (except 2/20A ACV

function), press any button, the buzzer will sound; otherwise,

the button is idleness. One minutes before auto power off, the

buzzer continue sound in five times, and one long buzz before

power off.

Note: when the selector in measuring function of 2/20A ACV,

the buzzer won’t sound.

The Effectiveness of Functional Buttons

Not every functional buttons can be used on every rotary switch

positions. Below table describe which functional buttons can be

used on which rotary switch positions.

Range Functional Buttons

LIGHT

SEL

MAX

RAN

DC Voltage

●

N/A

●

AC Voltage

●

N/A

●●

●

Resistance ●N/A ●N/A ●

Continuity, Diode test ●●●N/A N/A

DC current 2/20A

●

N/A

●●●

AC current 200/400A

●

N/A

●

Making Measurements

Measuring DC Voltage

WARNING

Beware of Electrocution

Pay special attention to avoid electric shock when

measuring high voltage.

Do not input the voltage which more than 600V DC.

Making Measurements

Plug the black test lead into

the COM jack and the red test

lead into the INPUT Jack.

Set the rotary switch to V

position to make the meter get

into DC V range.

Connect the test leads to the

voltage source or load

terminals for measurement.

Take the reading on the LCD.

When DC voltage measurement has been completed,

disconnect the connection between the testing leads and the

circuit under test and remove testing leads from the input

terminals.

Measuring AC Voltage

WARNING

Beware of Electrocution

Pay special attention to avoid electric shock when

measuring high voltage. Do not input the voltage which

more than 600V rms AC.

Plug the black test lead into

the COM jack and the red

test lead into the INPUT

Jack.

Set the rotary switch to V~

position to make the meter

get into AC V range.

Connect the test leads to

the voltage source or load

terminals for measurement.

Take the reading on the LCD.

When AC voltage measurement has been completed, disconnect

the connection between the testing leads and the circuit under test

Making Measurements

and remove testing leads from the input terminals.

Measuring Resistance

WARNING

To avoid possible damage to your multimeter or to the

equipment under test, disconnect the circuit power and

discharge all high-voltage capacitors before measuring

resistance.

Plug the black test lead into

the COM jack and the red

test lead into the INPUT Jack.

Set the rotary switch to

Ω/ / range position.

Connect the test leads to the

ends of the resistance or

circuit for measurement.

Take the reading on the LCD.

To obtain a more precise

reading, you could remove the objects being tested from the circuit

when measuring.

Testing Diode

WARNING

To avoid possible damage to your multimeter or to the

equipment under test, disconnect the circuit power and

discharge all high-voltage capacitors before testing diodes.

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