MEGABRAS MPK102e Manuale utente
Formato: 137mm x 190mm
P. 23
P. 03
Manual de uso
Micro-ohmímetro digital
Digital micro-ohmmeter User guide
GU-1408RA
NAC220240
3
MPK-102e
100 A digital micro-ohmmeter
User guide
GU-1408RA
© 2010 MEGABRAS. All rights reserved.
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(
Safety Precautions
•This equipment should be operated only by qualified and duly trained people,
closely observing the corresponding safety regulations and instructions
contained in the present 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 specified limits.
•Do not connect or disconnect the test leads during the measurement.
•There are no adjustable parts or parts that can be replaced by the user within the
equipment. Taking out the Control Panel in order to have an access to the
internal parts may be dangerous as there are high voltages inside, capable 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 plastic parts used in the case and in the
Control Panel of this equipment.
This equipment should be used only by a trained and competent
person, strictly applying suitable safety rules.
Used symbols
Caution, refer to User Guide.
Equipment complies with current EU Directives.
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Index
1. Description ............................................................................................................ 6
2. Operating principle ............................................................................................... 6
3. Operating instructions ........................................................................................... 6
3.1. Use of test probes ......................................................................................... 6
3.2. Control panel ................................................................................................. 7
3.3. Power supply ................................................................................................. 8
3.4. Measurement ................................................................................................. 9
3.5. Display messages ....................................................................................... 13
4. Some notes about accuracy ............................................................................... 14
5. Protections .......................................................................................................... 15
5.1. Start with I = O ............................................................................................. 15
5.2. Temperature protection ............................................................................... 15
6. Battery condition ................................................................................................. 16
6.1. Battery and charger ..................................................................................... 16
8.Cleaning ............................................................................................................. 18
9. Technical specifications ...................................................................................... 19
10.Warranty ........................................................................................................... 21
7.Replacement fuse .............................................................................................. 18
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1. Description
The MEGABRAS MPK-102e high-current micro-ohmmeter is a portable,
microprocessor-controlled instrument, used to accurately measure very
low contact resistances of breakers and switches, busbars, transformers
winding and engines, etc, with test currents from 1 mA to 100 A.
• Kelvin architecture (four-terminal method).
• Digital reading, alphanumeric display.
• Up to 4½ digits readings.
• Powered by rechargeable battery or mains supply.
• 0.1 µΩ resolution.
• 200 Ω maximum reading.
• Overheating protection.
2. Operating principle
This device uses the Kelvin Bridge architecture, with four terminals,
avoiding testing leads resistance to cause error during measurement.
Test current may be chosen by the operator and the reading is obtained
by comparison through internal high-stability standards. The result
appears in the alphanumeric display which is very easy to read.
3. Operating instructions
3.1. Use of test probes
Select the suitable test probes for the measurement you intend to perform
taking into account the current chosen for the test (Cables for up to 10 A
or 100 A). If you use the cables corresponding to 100 A, please verify that
the test probes are tightly fit in their corresponding connectors.
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3.2. Control panel
On/Off switch.
Stop button.
Start button.
Hold button. It retains the last measurement in the display.
Button to measure the Battery charge condition.
Alphanumeric display that shows both the measured resistance
value and messages to the operator.
Power cord connector.
Fuse.
Ground.
100 A (C1) current output terminal.
10 A (C1) current output terminal.
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USB output.
Potential (P1) terminal.
Potential (P2) terminal.
10 A (C2) current output terminal.
100 A (C2) current output terminal.
Range and test current Selector
Battery charge led.
Thermal protection led.
Test Current control.
3.3. Power supply
Mains supply or internal battery powered
Battery: rechargeable, 12 V.
Internal battery is useful for up to 10 A.
Mains: 220 - 240 V~
Mains power is useful for any test current, including 100 A.
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3.4. Measurement
( Warning
•Before to use this instrument the User guide and Safety warnings must be read
and understood.
•Safety procedures and rules for working near high voltage energized systems
must be observed during the use of this equipment. The generated voltages and
currents may be dangerous.
1. Before power-on the equipment, connect the test probes to the item
to be measured and to the front panel terminals, as shown in figure 2
for current up to 10 A or in figure 3, for the 100 A range.
The clamps in the drawings are only for illustration.
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2. Switch the equipment On using
the On/Off switch.
3. Using the Range
selector, choose the range and
the current to use
4. Be sure that the Test current
control is at the start position
(counter-clockwise completely
rotated).
Otherwise, Start button will be
inhibited and the display will show
the message:
5. The PRESS START message will
appear showing that
measurement can be started.
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6. Press the Start button.
The LOW CURRENT message
will turn up:
7. Turning the Test current control
clockwise, increase current until
obtaining the desired value or
until the current bargraph reads
100 divisions. The bargraph will
show the test current value as
the percentage of the nominal
value selected by using the
Range selector.
8. The equipment should be connected to the mains supply in order to
work with 100 A.
9. The lowest current for measuring is 10% of the range nominal value.
It is important to consider that the measurement errors increase while
test current decreases. The error is specified for test currents higher
than 80%.
10. The Display will show the resistance value measured and the unit
used (Ω [ohms], mΩ [milli-ohms] or µΩ [micro-ohms]).
11. The value can be retained in the
second line of the display by
pressing the button Hold. If you
press this button again, the value
will be erased.
Indice
Lingue:
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