Product Description

Highly-accurate turns ratio readings, ease of operation, and reliability

The TRF-250 is Vanguard’s fourth generation transformer turns ratio tester. This latest design provides a higher turns-ratio test voltage of 250Vac, provides a wireless Bluetooth PC interface, and features a 44-key “QWERTY”-style membrane keyboard. All these features greatly improve the accuracy of the turns ratio readings, ease of operation, and reliability.

The TRF-250 determines the turns ratio of the transformer under test using the IEEE C57.12.90 measurement method. The turns-ratio range is from 0.8 to 50,000 to 1. Transformer turns ratio,  excitation current, and winding polarity are displayed on the built-in 128 x 64 pixels graphic LCD screen. The TRF-250 can be used as a standalone unit or can be computer-controlled.

• Ratio Range: 0.8 – 50,000 to 1
• Capable of detecting 130 different 3-phase transformer types defined by ANSI, IEC, and Australian standards
• 4 test voltages: 4Vac, 40Vac, 100Vac, and 250Vac
• Phase angle and excitation current measurement
• Bluetooth and USB PC interfaces
• 4.5-inch wide thermal printer (optional)