Harbor Freight Tools CEN-TECH 41080 Istruzioni per il montaggio

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CONTENTS PAGE

SAFETY INFORMATION ….…………………………………………………

SAFETY SYMBOLS .………………………………………………………..

SAFETY PRECAUTIONS …………………………………………………..

MAINTENANCE .…………………………………………………………….

GENERAL DESCRIPTION …..…………………………………………….

FRONT PANEL DESCRIPTION …..……………………………………….

OPERATING INSTRUCTIONS …………………………………………….

SPECIFICATIONS …...……………………………………………………..

REPLACING THE BATTERY ...…………………………………………….

ACCESSORIES ……………………………………………………………..

SAFETY INFORMATION

The digital clamp meter has been designed according to IEC1010 – 1 and IEC1010 –

2 – 032 concerning safety requirements for electrical measuring instruments and

hand – held current clamps with an overvoltage category (CAT II) and pollution 2.

SAFETY SYMBOLS

Important safety information, refer to the operating manual.

Dangerous voltage may be present.

Earth ground.

Double insulation (Protection class II).

The digital clamp meter complies with the requirements of the following European

Community Directives: 89/336/EEC (Electromagnetic Compatibility) and 73/23/EEC

(Low Voltage) as amended by 93/68/EEC (CE Marking).

However, electrical noise or intense electromagnetic fields in the vicinity of the

equipment may disturb the measurement circuit. Measuring instruments will also

respond to unwanted signals that may be present within the measurement circuit.

Users should exercise care and take appropriate precautions to avoid misleading

SAFETY PRECAUTIONS

Follow all safety and operating instructions to ensure maximum personal safety

during the operation and to ensure the meter is used safely and is kept in good

operating condition.

-1-

•

Read these operating instructions thoroughly and completely before

operating your meter. Pay particular attention to WARNINGS, which

will inform you of potentially dangerous procedures. The instructions in

these warnings must be followed.

Always inspect your meter and test leads for any sign of damage or

abnormality before every use. If any abnormal conditions exist (i.e.

broken test leads, cracked cases, display not reading, etc.), do not

attempt to take any measurements.

Do not expose the instrument to direct sunlight, extreme temperature

or moisture.

Never ground yourself when taking electrical measurements. Do not

touch exposed metal pipes, outlets, fixtures, etc., which might be at

ground potential. Keep your body isolated from ground by using dry

clothing; rubber shoes, rubber mat, or any approved insulating

material.

You always are careful when working with voltages above 60V dc or

30V ac rms. Keep fingers behind the probe barriers while measuring.

Never use the meter to measure voltages that might exceed the

maximum allowable input value of any function.

Never touch exposed wiring, connections or any live circuit when

attempting to take measurements.

MAINTENANCE

•

Before opening the case, always disconnect test leads from all

energized circuits.

Never use the meter unless the back cover is in place and fastened

completely.

Do not use abrasives or solvents on the meter. To clean it using a

damp cloth and mild detergent only.

Qualified and trained service technicians should only perform

calibration and repair of the meter.

-2-

•Do not attempt calibration or service unless trained and another

person capable of rendering first aid and resuscitation is present.

GENERAL DESCRIPTION

The meter is a handheld 3 1/2 digital clamp meter for measuring DC and AC voltage,

AC current, Resistance and Continuity Test with battery operated.

FRONT PANEL DESCRIPTION

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

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

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



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

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

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

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



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Transformer jaws

Pick up theAC current flowing through the conductor.

Hold button

When this button is pushed, the display will keep the last reading and

“ ”

symbol will appear on the LCD until pushing it again.

Rotary switch

This switch is used to select functions and desired ranges as well as

to turn on/off the meter.

Back light

To use this function, press the Back light button. When this button is

pushed, the Back light of display is on. After about 3 −5 seconds, the

Back light is self-off. The Back light is on again, just push this button

once.

Display

3 1/2 digit, 7 segment, 18mm high, LCD.

“V” jack

This is positive input terminal for VOLT measurements connection is

made to it using the red test lead.

“COM” jack

This is negative (ground) input terminal for all measurement modes

except current. Connection is made to it using the black test lead.

“Ω” jack

This is the positive input terminal for ohms. Connection is made to it

using the red test lead. -3-

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









MAX

This measurement function is used to measure the maximum value

of a signal. It is usable with AC/DC voltage, AC current and

resistance measurements.

To use this function, select the function and range and press the MAX

button. When this is done, the “MAX” annunciator will appear in the

display. Next, by inputting a signal, the MAX function operates. This

maximum value is held in digital memory for a long period.

To exit the MAX mode, press the MAX button once again.

Trigger

Press the lever to open the transformer. When the lever is released,

the jaws will close again.

-4-

CLAMP METER LAYOUT

-5-

OPERATING INSTRUCTIONS

DC VOLTAGE MEASUREMENT

Connect the red test lead to the “V” jack and the black lead to the “COM”

jack.

Set rotary switch at desired 1000V position.

Connect test leads across the source or load being measured.

Read voltage value on the LCD display along with the polarity of the red

lead connection.

AC VOLTAGE MEASUREMENT

Connect the red test lead to “V” jack and the black test lead to the “COM”

jack.

Set the rotary switch at desired 750V~ position.

Connect test leads across the source or load being measured.

Read voltage value on the LCD display.

AC CURRENT MEASUREMENT

Set the rotary switch at desired A~ position.

Press the trigger to open transformer jaw and to clamp one conductor

only, making sure that the jaw is firmly closed around the conductor.

Read current value on LCD display.

RESISTANCE MEASUREMENT

Connect the red test lead to “Ω” jack and black test lead to the “COM” jack.

(The polarity of red lead is positive “+”.)

Set the rotary switch at desired ”Ω” range position.

Connect test leads across the resistor to be measured and read LCD

display.

If the resistance being measured is connected to a circuit



turn off power

and discharge all capacitors before applying test probes.

NOTE:

If the resistance being measured exceeds the maximum value of the range

selected or the input is not connected, an overrange indication





will be

displayed.

When checking in-circuit resistance, be sure the circuit under test has all

power removed and that all capacitors have been discharged fully.

For measuring resistance above 1MΩ, the meter may take a few seconds

to get stable reading. This is normal for high resistance measurements.

At 2000MΩrange display reading is around 10 counts when test leads are

shorted.

These counts have to be subtracted from measuring results. For example,

-6-

when measuring 1000MΩresistance the display reading will be 1010

and the correct measuring result should be 1010



10 = 1000 MΩ.

AUDIBLE CONTINUITY TEST

Connect red test lead to “Ω” jack, black test lead to “COM” jack.

Set range switch to “ ” position.

Connect test leads to two points of circuit to be tested. If continuity exists,

built-in buzzer will sound.

SPECIFICATIONS

Accuracy is specified for a period of one year after calibration and at 18



to 28



(64°F to 82°F) with relative humidity to 80%.

GENERAL

Maximum voltage between

terminals and earth ground

: CAT II 1000V dc or 750V ac rms. (sine)

Display :LCD, 1999 counts, updates 2-3/ sec.

Polarity indication :“-”displayed for negative polarity

Overrange Indication :Only figure “OL” on the display

Jaw opening capability : 55mm (Max conductor size)

Power :9V battery, NEDA 1604 or IEC 6F22

Low battery indication :“ ” appears on the display

Operating Environment :0 to 40

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Storage temperature :-10



to 50



Temperature coefficient :0.1



specified accuracy) /



( <18



or >28



)

Altitude : 2000m

Size : 282mm



104mm



47mm

Weight : Approx.500g.

DC VOLTAGE

Range Resolution Accuracy

1000V 1V ±1.0% of rdg ±2 digits

Input Impedance: 10MΩ-7-

AC VOLTAGE

Range Resolution Accuracy

750V 1V ±2.0 % of rdg ±5 digits

Input Impedance: <10MΩ

Frequency range: 40Hz to 400Hz. Response: Average responding, calibrated in rms.

of a sine wave.

AC CURRENT

Range Resolution Accuracy

200A 0.1A

1000A 1A <600A ±2.0% of rdg ±5 digits

>600A ±3.0% of rdg ±5 digits

Overload Protection: 1200A for 60 seconds maximum.

Frequency range: 50Hz to 60Hz.

RESISTANCE

Range Resolution Accuracy

200Ω0.1Ω±1.0% of rdg ±3 digits

20kΩ10Ω±1.5% of rdg ±5 digits

20MΩ10kΩ±1.5% of rdg ±5 digits

2000MΩ

1MΩ±5.0% of (rdg –10) ±10 digits

CONTINUITY

Range

Description

If continuity exists (about less than 30Ω), built-in buzzer will sound.

REPLACING THE BATTERY

WARNING

Before attempting to open the case of battery, always be sure that test leads have

been disconnected from measurement circuits. Close case and tighten screws

completely before using the meter to avoid electrical shock hazard.

-8-

Indice

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