This item is a great condition used Megger 550503 Three-Phase TTR Test Set Calibrated to NIST Traceable Standards on April 24, 2026. Includes H lead set, X lead set, green ground lead with clamp, standard power cable, Megger accessory bag, and a NIST traceable calibration certificate. All pictures are of the actual unit and accessories.

This item comes with a 180 day warranty. All functions are guaranteed to work or money will be refunded.

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Megger TTR310 Three-Phase TTR Test Set Transformer Turn Ratio NIST Calibrated

US$6,199.00

Quantity

Remote controllable
Works in the presence of high interference/high voltage
Capable of measuring phase-shifting transformers
Measures wide turns ratio range (45,000:1) with 0.1% accuracy
Displays % error vs. name plate with pass/fail limits
Capability for automatic vector detection when testing via PowerDB
Fully automatic operation (either stand-alone or remote-control)

Input Power	120V, ±10% 60Hz, ±2 Hz, 100 VA 240V, ±10% 50Hz, ±2 Hz, 100 VA
Excitation Voltage	8, 40, or 80 V rms, automatically or manually selected
Excitation Current Range and Accuracy	0 to 500 mA, 3 digit resolution, ±(2% of reading + 1 digit)
Phase Deviation Range and Accuracy	±90°, 1 decimal point for the minutes display, 2 decimal points for the degree display, or for the centiradian display Accuracy: ±3 minutes (±0.05 degrees)
Turns Ratio Range and Accuracy	8 Vac: ±0.1% (0.8 to 2000), ±0.25% (2001 to 4000), ±0.35% (4001 to 8000) 40 Vac: ±0.1% (0.8 to 2000), ±0.15% (2001 to 4000), ±0.3% (4001 to 10,000), ±0.35% (10,001 to 25,000) 80 Vac: ±0.1% (0.8 to 2000), ±0.15% (2001 to 4000), ±0.25% (4001 to 10,000), ±0.30% (10,001 to 45,000) Resolution: 5 digits for all ratios
Printer Interface	RS-232 port
Computer Interface	RS-232 port
User Interface	5.7 in. Color Display, text on-screen view, numeric keypad
Internal Data Storage	Up to 200 data sets
Communications/Control Software	PowerDB LITE and PowerDB (full version, optional)
Transformer Winding Phase Relationship	ANSI C57.12.70-1978 CEI/IEC 76-1:1993 and Publication 616:1978 AS-2374, Part 4-1982 (Australian Standard)
Safety/EMC/Vibration	Safety: IEC-1010-1 CE: IEC 61326-1 Vibration ISTA Guidelines (packaged), IEC61010 (unpackaged)
Temperature Range	Operating: 23° F to 122° F (-5° C to 50° C) Storage: -22° F to 140° F (-30° C to 60° C)
Relative humidity	0 to 90% noncondensing
Measuring Time	8 to 20 seconds depending on mode of operation and type of transformer
Measurement Method	ANSI/IEEE C57.12.90
Dimensions	Instrument: 8.5 H x 21.5 W x 13 D in. (216 H x 546.1 W x 330.2 D mm) Case: 25 H x 19 W x 26 D in. (635 H x 483 W x 660 D mm)