• measurement of winding resistance (inductive objects including amorphous core transformers)
• measurement of very low resistance
• transformer core demagnetization function
• automatic temperature compensation function (temperature probe)
• function of determining the temperature of a motor under load
• high immunity to disturbances
Application
The MMR-650 winding resistance and low resistance meter is designed to
measure very low very low resistance of both windings – including amorphous
core transformers – and resistive objects. This product is made to be used in
power plants, railways and maintenance companies to measure resistance of:
• windings of power transformers and motors,
• breakers, contacts,
• earthing conductors, equipotential bondings,
• welded and soldered connections,
• bolted connections,
• and other resistive and inductive objects.
MMR-650 can be also utilized on production lines (eg. at the final production
control stage).
Easy readout
The MMR-650 winding resistance and low resistance meter is equipped with
a readable colour touchscreen that, due to its 800 x 480 pixel resolution, provides
both high comfort of interacting with the interface and high readability of
the measurement results.
Durable and practical casing
In response to the customers needs the MMR-650 microohmmeter has been
designed to operate in difficult environmental conditions. A unique casing with
the IP67 ingress protection rating ensures that the device is both waterproof
and dustproof.
Device capabilities
The MMR-650 winding resistance and low resistance meter provides an innovative
combination of a high-performance measuring device with a modern
user interface and advanced data management system. Wireless data transmission,
enhanced system of 2D codes and ability to print labels to identify
test items, all contribute to bringing new quality of work and allow the user to
perform a wide range of measurements.
Resistance measurement
Range Resolution Test current Accuracy
0…999.9 μΩ 0.1 μΩ
10 A
±(0.2% m.v. + 2 digits)
1.0000…1.9999 mΩ 0.0001 mΩ
2.000…19.999 mΩ 0.001 mΩ
20.00…199.99 mΩ 0.01 mΩ 10 A / 1 A
200.0…999.9 mΩ 0.1 mΩ
1 A / 0.1 A
1.0000…1.9999 Ω 0.0001 Ω
2.000…19.999 Ω 0.001 Ω 0.1 A
20.00…199.99 Ω 0.01 Ω 10 mA
200.0…1999.9 Ω 0.1 Ω 1 mA
Technical specification
insulation type according to EN 61010-1 double,
measurement category acc. to EN 61010-2-030 III 600 V
ingress protection according to EN 60529
with closed housing IP67
with open housing, powered from the
battery pack, installed plugs IP54
with open housing, powered from mains
and/or without plugs P40
protection against external voltage up to 600 V AC for 10 s
power supply to battery charger
90 V…265 V
50 Hz…60 Hz
2 A
battery charging time ca. 3.5 h
number of measurements (of resistive objects) with
10 A current performed when powered from the
battery pack
700 to 800 depending on the ambient temperature
maximum wire resistance for 10 A current 300 mΩ
accuracy of measuring current setting ±10%
time of performing the resistance measurement
with selected resistive object type and
bidirectional current flow 3 s
with selected inductive object type,
dependent on the resistance and
inductance of the object
5 s or more
dimensions 318 x 257 x 152 mm
12.5” x 10.1” x 6.0”
meter weight
ca. 3.5 kg
ca. 7.7 lbs
operating temperature
-10°C…+50°C
14°F…122°F
charger operating temperature
0°C…45°C
32°F…113°F
storage temperature
-20°C…+60°C
-4°F…+140°F
humidity 20%…90%
reference temperature
23°C ± 2°C
73.4°F ± 3.6°F
reference humidity 40%…60%
temperature coefficient ±0.01% of d.v./°C ± 0.1 digit/°C
time to AUTO-OFF 5 to 45 minutes or option not active, depending on the setting
TFT graphic display 800 x 480 pixels
interface standard USB, LAN, Wi-Fi
quality standard design and manufacturing are ISO 9001 compliant
the product meets the EMC requirements
(emission for industrial environment) according to EN 61326-1:2013 and EN 61326-2-2:2013
compliance with FCC Rules Class A digital device
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