Product features
• measurement of very low resistance
• high immunity to disturbances
• easy operation
• big touchscreen
• automatic measurement mode
• autoranging
Low resistance within range
open housing
closed housing
Application
The MMR-640 meter is designed to measure very low resistance of resistive objects. This product is made to be used in
power plants, railways and maintenance companies to measure resistance of:
• breakers, contacts,
• earthing conductors, equipotential bondings,
• welded and soldered connections,
• bolted connections,
• and other resistive objects.
MMR-640 can be also utilized on production lines (eg. at the final production control stage).
Device capabilities
The MMR-640 meter provides an innovative combination of a high-performance
measuring device with a modern user interface and advanced data
management system.
Durable and practical casing
In response to the customers needs the MMR-640 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.
Easy readout
The MMR-640 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.
Resistance measurement
Range Resolution Test current Accuracy
0…999.9 μΩ 0.1 μΩ
10 A
±(0.25% 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…800 depending on the ambient temperature
maximum wire resistance for 10 A current 300 mΩ
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” x10.1” 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…45 minutes or option not active, depending on the setting
TFT graphic display 800 x 480 pixels
interface standard USB
quality standard design and manufacturing are ISO 9001 compliant
the product meets the EMC requirements
(emission for industrial environment) according to
EN 61326-1 and EN 61326-2-2
compliance with FCC Rules Class A digital device
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