Megger MTO106 Specifications
MTO106
Transformer ohmmeter
MTO106
Transformer ohmmeter
▪▪
2 channels with max 6 A current output
▪▪
±0.25% measurement accuracy
▪▪
48 V test voltage for fast saturation of
transformers
▪▪
Multimeter type operation, intuitive and
fast
▪▪
Safety through automatic, passive discharge
circuitry
▪▪
True portability – compact size and low
weight
DESCRIPTION
The MTO106 transformer ohmmeter is an easy-to-use, line-operated
instrument specifically designed for safe and accurate field measurement of
winding resistance in smaller transmission and distribution transformers.
It has dual channels with a wide measurement range and can
accurately provide information about the vast majority of power
transformers, reactors and instrument transformers. The test current
can be manually set in five different ranges to fit transformers of
various sizes.
The instrument is exceedingly simple to use, which minimizes the
need to train service engineers. It has a single selector switch for test
current and a single button to activate the test cycle. The instrument
is also supplied with test leads fitted with Kelvin clamps that allow for
a single, one-time connection to the unit under test. The test leads
are 10 m (33 ft) in length to allow for easy testing of pole mounted
transformers.
The compact and lightweight instrument is housed in a rugged plastic
case for true portability. When closed, the case is rated IP67, which
means your instrument will always arrive safely to the testing location
even in the harshest conditions.
Users are protected by an automatic discharge function that deenergizes the transformer winding at the end of every test. The
discharge function is passive and thus also functions if there is an
inadvertent loss of power or if the test or mains leads are accidentally
pulled.
APPLICATIONS
The MTO106 is mainly intended for field measurements of smaller
transmission and distribution transformers:
▪
To verify factory test readings
▪
As part of a regular maintenance program
▪
To help locate the presence of defects in transformers such as
increased contact resistance in terminal connections and tap
changers
The instrument can also be used for general resistance measurements
including: control wiring, voltage regulators, motors, generators and
all types of connections.
MTO106
Transformer ohmmeter
SPECIFICATIONS
Specifications are valid at nominal input voltage. Specifications are
subject to change without notice.
Environment
Application field The instrument is intended for use in
Temperature
Operating -20°C to +50°C (-4°F to +122°F)
Storage & transport -50°C to +70°C (-58°F to +158°F)
Humidity (operating) 0% – 90% RH, non-condensing
CE-marking
LVD 2014/35/EU
EMC 2014/30/EU
RoHS 20 11 / 6 5 / EU
General
Mains voltage 100 - 240 V AC, 50 / 60 Hz
Input power 400 VA (max)
Case Ruggedized plastic case with removable lid
Dimensions (W x D x H) 360 x 304 x 194 mm (14.2 x 12 x 7.6 in.)
Weight 7.3 kg (16 lbs) excl. cables
Display 4-inch, backlit, monochrome
Test l eads 2 x 10 m (33 ft), with banana connectors
Ground lead 1 x 5 m (16 ft), 2.5 mm²
Measurement section
Measurment range 10 µOhm to 30 kOhm
Resolution Up to 4 digits
Open circuit test voltage up to 48 V DC
Measurement voltage up to 20 V DC
Current
range
6 A
1 A 100.0 mΩ to 30.00 Ω ±(0.25%rdg + 1 digit) 4 digits
100 mA 1.000 Ω to 300.0 Ω ±(0. 25%rdg + 1 digit) 4 digits
10 m A 10.00 Ω to 3000 Ω ±(0.25%rdg + 1 digit) 4 digit s
1 mA 100.0 Ω to 30.00 kΩ ±(0. 25%rdg + 1 digit) 4 digits
Resistance range Inaccuracy Resolution
10.00 mΩ to 5.00 0 Ω
0.010 mΩ to 9.999 mΩ
0.10 mΩ to 99.99 mΩ
1.0 mΩ to 999.9 mΩ ±(0.25%rdg + 2 digits) 0 .1 mΩ
0.010 Ω to 9.999 Ω ±(0.25%rdg + 2 digits) 0. 001 Ω
0.10 Ω to 99.99 Ω ±(0.25%rdg + 2 digits) 0 .01 Ω
high-voltage substations and industrial
environments.
and carrying handle, IP 67 when closed
alphanumerical display
and Kelvin clamps
±(0.25%rdg + 1 digit) 4 digits
±(0.25%rdg + 2 digits) 0 .001 m Ω
±(0.25%rdg + 2 digits) 0 .01 mΩ
INCLUDED ACCESSORIES
GC- 3 2 3 1 0
GA-00200
GC- 3 2 3 1 2
2000-091
OPTIONAL ACCESSORIES
1009-74 4
Transport case suited for the
instrument and cables.
ORDERING INFORMATION
Item Cat. No.
MTO106
Included accessories
Test lead black with banana connector
and Kelvin clamp, 10 m (33 ft)
1 GC- 3 2 3 1 0
Test lead red with banana connector
and Kelvin clamp, 10 m (33 ft)
1 GC- 3 2 3 1 2
Ground lead, 5 m (16 ft) 2.5 mm² 1 GA-00200
Mains cable 1 AA-00010
User’s manual 1 ZP-BN 01E
MTO106 Report pad 1 XP-BN 01E
MTO106 Reporting template file 1 SB-0022E
Carry bag 1 2000-091
MTO106 Without accessories
Optional accessories
Transport case for instrument and leads
MTO106 dual channel measurement lead set
Parts included in the MTO106 dual channel
measurement lead set (GA-03310).
Sensing lead, black, 10 m (33 ft) 1 KG- 0 0530
Sensing lead, red, 10 m (33 ft) 1 KG- 0 0532
Timing clamp 2 KD- 03040
Test cable, black, 2 m (6.5 ft) 1 04-35030
BN-19090
BN-19000
1009-74 4
GA-03310
United States
Megger USA Valley Forge Corporate Center
2621 Van Buren Avenue, Norristown,
Pennsylvania, 19403, USA
T. 1-610 676 8500
F. 1-610-676-8610
MTO106_DS_en-us_V04a
ZI-BN01E • Doc. BN034793DE • 2019
Subject to change without notice
Registered to ISO 9001 and 14001
The word ‘Megger’ is a registered trademark
www.meger.com
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