MEGABRAS MPK257 User manual
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
© 2018 MEGABRAS. All rights reserved.
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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.
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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.
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Index
1. Descri tion.............................................................................................................7
1.1. O erating rinci le..........................................................................................7
2. Control anel..........................................................................................................8
3. Power su ly..........................................................................................................9
3.1. Battery condition.............................................................................................9
3.2. Battery charger...............................................................................................9
3.3. Auxiliary ower..............................................................................................10
4. Settings and Adjustments....................................................................................11
5. Measurement.......................................................................................................13
6. Dis lay messages................................................................................................16
7. Some notes about accuracy................................................................................17
8. Printer...................................................................................................................18
9. Internal memory...................................................................................................18
10. Software.............................................................................................................19
10.1. MegaLogg2 software..................................................................................19
11. Remote control...................................................................................................20
12. Cleaning.............................................................................................................21
13. Re lacement fuse........................................................................................21
14. Technical s ecifications.....................................................................................22
15. Warranty.............................................................................................................24
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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 µΩresolution
Tem erature com ensation
2000 Ωmaximum 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.
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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.
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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.
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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.
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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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