Transformer Ohmmeter

 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. 

• Entry level 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

 Automated six-winding transformer ohmmeter

• Automated 8-terminal/6-winding measurement capability
•  Simultaneous winding magnetization
•  Tests operation of on-load tap-changers
•  Built-in auto-demagnetization feature
•  Automatic discharge
•  Power DB software (MTO330)

Model MTO330 shown above.

The MTO 300 series delivers full eight-terminal/six-winding resistance measurement capability. It is designed to save time for the user by testing all normal 6 windings without having to disconnect and reconnect leads during testing.

The MTO3xx series also shares the Megger TTR300 series lead set. Users who test both turns ratio and winding resistance can save time and money since only one lead set is needed to connect to the transformer.

MTO3XX Series Datasheet