Megger MTO210 Transformer Ohmmeter

The Megger MTO210 Transformer Ohmmeter is a line-operated, field-portable instrument designed specifically to measure the DC resistance of all types of magnetic windings safely and accurately. It can test transformers and rotating machine windings and performs low-current resistance measurements on connections, contacts and control circuits. The dual set of potential inputs measures the resistance of the primary and secondary windings of a single or three-phase transformer simultaneously. This dual reading, dual injection characteristic, also helps to speed up the measurements when used to test LV windings on large three-phase power transformers. Tap-changers are the most vulnerable part of a transformer. Tap-changers result in more failures and outages than any other component and so require frequent testing and attention to ensure reliable and safe operation.
 
This Megger Transformer Ohmmeter is extremely useful when testing the windings and contact resistance of tap-changers with “make-before-break” contacts and voltage regulators. This action will check for pitted or misaligned contacts with an indication if either condition occurs. Users are also protected by the auto-shutdown safety feature. Any inadvertent disconnection of a test lead or loss of power to the instrument will safely discharge the energy stored in the unit under test. The Megger MTO210 offers facilities for demagnetising the transformer cores before or after resistance testing is carried out and it can also be used as a standalone core demagnetiser. A regular maintenance program that includes winding resistance measurements is the most effective way to use the Megger MTO210. Once a benchmark is established, subsequent test results can be compared to determine if changes are occurring in the transformers and associated control wiring, voltage regulators, motors, generators, breaker contacts, and all types of connections (bolted, soldered, crimped, etc).

The Megger Transformer Ohmmeter offers a wide resistance range which allows for it to be used for the heat-run testing of various types of transformers. Test results are shown on a large LCD and can be stored in the devices internal memory ready for printing or downloading. As such the MTO210 is compatible with Megger's PowerDB software which provides uniform test result analysis and reporting features for a multitude of power equipment tests. The MTO210 Transformer Ohmmeter is built into a rugged case with a hinged lid and carrying handle, making it suitable for use both on site and in the workshop.

Megger MTO210 Transformer Ohmmeter features
► Direct 2-channel digital (1µΩ to 2000Ω).
► DC test current up to 10A
► 0.25% measurement accuracy
► Very fast discharge time.
► High-contrast, large alphanumeric displays can be seen in bright sunlight.
► User-selectable maximum current range ensures protection of small transformers.
► Beacon drive circuit is provided for use with optional beacon strobe light.
► Can test of transformers with on-load tap-changers.
► When an external interlock safety perimeter is created, a safety interlock circuit is provided.
► Remote trigger switch is also provided for testing transformers with tap-changers.
► Internal flash memory allows for mass storage of dataset records.
► Ruggedized clamps, with 100 mm jaws, are provided eliminating the need for bushing adapters.
► Compatible with PowerDB software package.
► Built-in circuitry safely discharges the specimen when test is completed, if lead accidentally disconnects, or power is lost.
► Output RS232 serial port.
► Detachable lid for ease of use.
► Unit can be operated while in transit case.
► Leads can stay connected while in transit case.

► Megger MTO210 Transformer Ohmmeter
► V1 Potential Lead Set: 18m
► V2 Potential Lead Set: 18m
► Current Lead Set: 18m
► Jumper Lead: 9m
► Ground Lead: 4.5m
► RS232 Cable for connecting to a PC and Printer
► Remote Hand Switch
► AC Power Cord (IEC60320-C13 to US standard)
► AC Power Cord (IEC60320-C13 to Schuko CEE 7/7)
► Quick Start Guide
► Canvas Carrying Bag (for leadset)
► CAT5e Patch Cable
► Instruction Manual
► PowerDB LITE

► Input: 120/240V, 50/60Hz, 720VA
► User Selectable Current Ranges: up to 10mA, 100mA, 1A and 10A
► Open-Circuit Test Voltage: up to 50V DC
► Resistance: 1µΩ to 2000Ω
► Accuracy: ±0.25% reading, ±0.25% full scale (when current has stabilized)
► Resolution: Up to 6 digits
► Displays: 2 x 1” high, 6 character, 7-segment, LCDs; 1 x 0.71” high, 6 character, 7-segment, LCD
► Printer Via RS-232 port
► B&W alphanumeric displays, keypad
► Internal Data Storage: Up to 10,000 data sets
► Operating temperature: -10°C to 50°C
► Storage temperature: -15°C to 70°C
► Relative Humidity: 0 - 90% non-condensing
► Dimensions: 216 x 546 x 330mm
► Weight: 13.1 kg