MEGABRAS MPK257 Manual de usuario

Formato: 137mm x 190mm

P. 25

P. 03

Manual de uso

Micro-ohmímetro digital

Digital Micro-ohmmeter User guide

MPK-257

Digital micro-ohmmeter

User’s guide

GF-2072



Safety Precautions

This equi ment should be o erated only by qualified and duly trained eo le,

closely observing the corres onding safety regulations and instructions

contained in the resent User guide.

It should be checked that the item to be measured is voltage free.

Before starting with the measurements, be sure that the battery is well

charged and that the line voltage is between s ecified limits.

Do not connect or disconnect the test leads during the measurement.

There are no adjustable arts or arts that can be re laced by the user within

the equi ment. Taking out the Control Panel in order to have an access to the

internal arts may be dangerous as there are high voltages inside, ca able of

causing fatal accidents.

Cleaning of this instrument should be carried out using a soft cleaning liquid,

after verifying that it doesn't attack the lastic arts used in the case and in the

Control Panel of this equi ment.

This equipment should e used only y a trained and competent

person, strictly applying suita le safety rules.

Used sym ols

Caution, refer to User Guide.

Battery.

Printer.

USB (Universal Serial Bus).

30 V max. (to ground): indicates the maximum otential allowed

in the terminals during resistance measurements.

Ground rotection: the terminal identified by this symbol is

intended for connection to an external conductor for rotection

against electric shock in case of failure, or the terminal of a

ground rotection electrode.

Equi ment com lies with current EU Directives.

Double insulation: symbol indicates that the equi ment is

classified as Class II (double isolated).

The rubbish bin with a line through it means that in the Euro ean

Union, the roduct must undergo selective dis osal for the

recycling of electric and electronic material, in com liance with

Directive WEEE 2002/96/EC.

Index
Descri tion.............................................................................................................7
1. O erating  rinci le..........................................................................................7
Control  anel..........................................................................................................8
Power su ly..........................................................................................................9
1. Battery condition.............................................................................................9
2. Battery charger...............................................................................................9
3. Auxiliary  ower..............................................................................................10
Settings and Adjustments....................................................................................11
Measurement.......................................................................................................13
Dis lay messages................................................................................................16
Some notes about accuracy................................................................................17
Printer...................................................................................................................18
Internal memory...................................................................................................18
Software.............................................................................................................19
1. MegaLogg2 software..................................................................................19
Remote control...................................................................................................20
Cleaning.............................................................................................................21
 Re lacement fuse........................................................................................21
Technical s ecifications.....................................................................................22
Warranty.............................................................................................................24
6

1. Description

The MPK-257 micro-ohmmeter is a ortable, micro rocessor controlled

instrument, used to accurately measure very low contact resistances of

breakers and switches, busbars, transformers and engines windings, etc,

with test currents from 1 mA to 10 A.

Micro rocessor controlled

Kelvin architecture (four-terminal method)

Digital reading, al hanumeric dis lay

U to 4½ digits readings

Powered by rechargeable battery

0.1 µΩresolution

Tem erature com ensation

2000 Ωmaximum reading

U to 10 A current

Remote control through an Android a

1.1. Operating principle

This device uses the Kelvin Bridge architecture, with four terminals,

avoiding testing leads resistance to cause error during measurement. The

o erator may choose test current and the reading is obtained by

com arison through internal high-stability standards. The result a ears

in the al hanumeric dis lay that is very easy to read.

2. Control panel

 Connection of temperature sensor

 Dis lay.

 Current terminal (C+).

 Potential terminal (P+).

 Potential terminal (P-).

 Battery charge indicator.

 Current terminal (C-).

 Selector of ranges and currents.

 Battery key. To measure the battery

charge condition.

 Safety ground.

Printer Key

 Filter key.

 Power cord connector.

 Fuse.

 Auxiliary su ly connector.

 Printer.

 USB connector.

 On/Off switch.

3Test current control.

4Start key.

5Sto key.

6Tem erature com ensation button.

7 Save key.

3. Power supply

Mains supply or internal attery powered

Battery: LFP, rechargeable, 12 V - 6000 mAh.

Mains: 220 - 240 V~.

Auxiliary supply: 12 V.

Make sure that the voltage of the mains su ly is com atible with

the voltage su ly of the equi ment!

Before connecting the equi ment to the mains su ly, make sure

that the ower cord is not damaged. If damaged, do not connect

the equi ment to the mains su ly and contact the service center

for re lacing the ower cord.

3.1. Battery condition

The charge condition of the battery can be verified before or during the

resistance measurement. In order to achieve that, the o erator has to

ress the attery key while the equi ment is turned on. The bargra h

shows remaining charge as a ercentile value.

3.2. Battery charger

Charging procedure:

Check that the On/Off switch is in Off.

Connect the equi ment to the mains su ly.

The attery charge indicator ( ) will kee on

lightning with a red light u to com leting the charge. At that oint, it

will change to a green light, being like this u to the equi ment

disconnection from the mains su ly.

If during the charging of the battery the device was switched on, by

activating the key , the charge will be tem orarily interru ted. When

the equi ment is turned off, the charge will restart automatically.

The rechargeable battery has no "memory effect" so it can be charged as

many times as desired. On the other hand, its useful life is significantly

reduced if it is allowed to remain totally discharged.

To avoid this effect, charge the battery before storing the equi ment and

do not allow more than 30 days to ass without re eating the charging

rocess, even if the instrument has not been used (The battery loses art

of its charge when it is stored).

At the end of its useful life, the battery must be recycled or dis osed

of ro erly to reserve the environment.

3.3. Auxiliary power

The MPK257 has a 12 V auxiliary ower in ut. This in ut can be used to

charge the battery or to ower the equi ment.

BLACK

RED

To make measurements or charge the battery.

4. Settings and Adjustments

This equi ment has a MENU for settings and

adjustments. To access the MENU, ress the

Selector / Adjust ( ).

All navigation is erformed through the and all anel keys are

disabled, with the exce tion of the key that has the function to cancel

and return to the initial screen.

Short ress: O en MENU, o en selected sub-menu /

confirm settings.

Long ress (1.5 s): Go back one level or cancel adjustment.

Change selection / values

Cancel and close the MENU

ATTENTION: The configuration MENU can not be accessed during the tests.

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