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HM5001 Ratio Tester

Transformer Turns Ratio Tester,
Ratio Group Ratio Tester

Product Description


A transformer turns ratio tester, also known as a TTR tester, is a specialized test instrument used to measure the turns ratio of transformers accurately. The turns ratio is a fundamental parameter that indicates the voltage transformation ratio between the primary and secondary windings of a transformer. It is essential to ensure that transformers are functioning correctly and within their specified performance limits. The transformer turns ratio tester is commonly used during commissioning, maintenance, and troubleshooting activities for various types of transformers, such as power transformers, distribution transformers, and instrument transformers.


  1. Test wide range, the highest ratio can be measured up to 10000.
  2. The built-in three-phase digital power supply, to improve the stability of the test.
  3. Small volume, light weight, fast test speed,10 seconds to complete the test phase.
  4. Z shaped linking transformer testing.
  5. Have blind test ratio, group test function.
  6. The display of clock and date on not power down, the function of data storage (can select to save data to the U disk).
  7. The function of high and low voltage reverser polarity protection, short circuit protection.
  8. The function of thermal printer output, fast speed, low noise.
  9. Full penetration type large-screen LCD, can clearly show in the sun.


  1. Range of measurement: 0.9~10000
  2. Resolution minimum: 0.0001
  3. Accuracy: 0.2level
  4. Output Voltage: 160 V
  5. Environment temperature: -10℃~50℃
  6. Environment humidity: ≤85%RH
  7. Working power: AC220V±10%
  8. Supply frequency: 50Hz/60Hz±1Hz
  9. Dimension: 345mm×295mm×175mm
  10. Instrument weight: 5Kg