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TTR-100 Single-Phase Hand Held TTR

Supplier: Maceys Electrical



  • Fully automatic, fast, easy-to-use, handheld, robust and lightweight.
  • Battery powered with power-saving and shutdown function.
  • Tests turns ratio, phase displacement, excitation current, vector group, winding resistance and polarity.
  • Alphanumeric keyboard.
  • RS232 for data transfer and printing.
  • Stores 200 test results and 100 user-defined transformer test settings.
  • Six user-selectable languages.


The Megger TTR100 is an automatic single-phase handheld, battery operated transformer turns ratio test set used to measure the turns ratio, excitation current, phase displacement, dc resistance and polarity of windings in single- and three-phase distribution transformers (tested phase by phase), potential & current transformers, and tapped transformers.

The unique design of the TTR100 allows the user to operate the test set while holding it in one hand. No other transformer test set offers this capability. It effectively eliminates the user from having to kneel or bend over to operate the instrument and speeds up testing time.

Realizing the extreme environments in which the TTR100 must operate, special attention has been paid to making it extra rugged, with a high impact, shock resistant case, yet incredibly lightweight (3.3 lb). It weights less than any other commercially available instrument on the market.

TTR100 is particularly suited for testing in substations and transformer-manufacturing environments where testing single and three-phase transformers can be performed. The TTR100 provides reliable results, helping the user in determining the condition of the transformer under test. It features a high contrast LCD screen which can be seen in bright or ambient light.

The TTR100 comes equipped with specially designed leads which provide the necessary flexibility needed in all weather conditions.

This unit measures the highest turns ratio in the industry with an accuracy of 0.1% or better and with the lowest excitation voltage. No other instrument’s performance is comparable that is commercially available today. Another excellent feature of this TTR is the ability to accurately measure phase deviation (in minutes or centiradians) of the transformer primary versus secondary.

This measurement is also useful in verifying phase errors in PTs and CTs. The TTR100 features special software capabilities. It comes equipped with sufficient onboard memory to store up to 200 test results (including test report header information) in the field for later retrieval, as well as 100 user-defined transformer settings.

Test results can be printed on an optional serial printer whenever a hard copy is desired, or the data can be downloaded to a PC. Identification of individual test readings is also easily done. The system software allows entry of the transformer alphanumeric serial number, transformer type and tap information (numerical, alphabetical, or alpha-numerical) for each test performed.

The TTR100 comes with a Windows® based software program that permits download of test data from the instrument to a PC database. Data stored in the database can be retrieved at a later date and test reports can be printed to assist in the preparation of management and/or analysis reports. These reports are easily transmitted via email.