The Megger TTR25-1 is an automatic hand-held battery-operated transformer turns ratio test set. It is used to measure the turns ratio, excitation current, and polarity of windings in single- and three-phase distribution and power transformers (tested phase by phase), potential & current transformers, and tapped transformers
| Battery Life | Up to 12 hours of field operation |
| Current (rms) Accuracy | 5% rdg +-0.5 mA |
| Dimensions | 240 H x 115 W x 50 D mm (9.5 H x 4.5 W x 1.9 D in.) |
| Display Full Graphics | LCD module, adjustable back-lighting, wide temperature range, 128 x 64 dots (21 characters by 8 lin |
| Excitation Current Range | 0 to 100 mA, 4-digit resolution |
| Excitation Voltage | 8 V rms for testing distribution or power transformers and PTs; 0.5, 1.5, or 8 V ac rms for testing |
| Measurement Method | ANSI/IEEE C57.12.90 and IEC 600076.1 (2000) |
| Measuring Time | Less than 5 seconds |
| Operating temperature | -20 Degree Celsius to 55 Degree Celsius (-5 Deg F to 130 Deg F) |
| Protective Devices | High voltage side shorting relay, transient voltage suppressors and gas surge voltage protectors |
| Safety/EMC/Vibration | Meets the requirements of IEC-61010, CE and ASTM D999.75 |
| Storage Temperature | -50 Degree Celsius to 60 Degree Celsius (-55 Deg F to 140 Deg F) |
| Test Frequency | 55 Hz internally generated providing a universal 50/60 Hz test set |
| Transformer Polarity | Normal or reversed |
| Turns Ratio Accuracy | 0.20% (0.8 to 4,000) |
| Turns Ratio Range | 0.8 to 20,000, 5 digit resolution |
| Type of Power | Six standard "AA" (IEC LR-6) alkaline batteries |
| Weight | Approximately 1.3 kg (2.8 lb), including leads |
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