Raytech TR-Mark III R 250V Three Phase Transformer Turns Ratio Meter

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Raytech TR-Mark III R 250V: Fully Automatic, Three Phase Transformer Turns Ratio Meter. The TR-Mark III R 250V turns ratio is the same instrument as the TR-Mark III 250V, but built into a 19” rack housing. Therefore, it can be used very well in test labs or be assembled into complete measurement systems. The TR-Mark III R 250V offers new features and increased accuracy to make it a perfect system. A color LCD with a back light and a touch screen increases handling and user comfort. Four USB interfaces make it easy to store measurements on external storage devices, transfer easily to a personal computer, and transfer or download nameplate data of the transformer to test.

SKU: Raytech TR-Mark III R 250V Category: Tags: ,



  • Extended test voltage measurement range of up to 250V
  • Automatic measurements of Voltage, Turns Ratio, Current and Phase displacement
  • Easy one-time hook up to the transformer
  • Automatic test voltage range
  • Displays deviation from a nominal ratio
  • Tap changer interface with graphic results
  • Load on test object <0.05 VA
  • Measures Power transformers, PTs and CTs
  • Automatic vector group detection
  • Enhanced heavy-duty protection circuitry
  • Emergency stop button immediately turns off output
  • Data storage for more than 10,000 measurements
  • Simple-to-operate color LCD touch screen with back light
  • Two USB interfaces
  • 5-Year standard warranty


RangeAccuracy at 100V or 40VAccuracy at 10VResolution
0.8 … 2,000±0.06% Rdg ±1 LSD±0.15% Rdg ±1 LSD5 Digits
2,001 … 4,000±0.1% Rdg ±1 LSD±0.3% Rdg ±1 LSD5 Digits
4,001 … 13,000±0.3% Rdg ±1 LSDnot specified5 Digits
13,001 … 16,000±0.4% Rdg ±1 LSD5 Digits
RangeAccuracy at 250VResolution
0.8 … 5,000±0.06% Rdg ±1 LSD5 Digits
5,001 … 10,000±0.1% Rdg ±1 LSD5 Digits
10,001 … 32,500±0.3% Rdg ±1 LSD5 Digits
32,501 … 45,000±0.4% Rdg ±1 LSD5 Digits
0 … 1A±0.001A0.1mA
Phase AngleAccuracyResolution
±90 Degree±0.05 Degree0.01 Degree
Turns Ratio Range0.8 to 45,000
TemperatureOperating: -10ºC to 60°C (14ºF to 140ºF)
Storage: -20°C to 70°C (-4ºF to 158ºF)

See Instruction Manual for more parameters. Specifications subject to improvement at any time.


  • Size: L: 490 mm (19.3″) W: 436 mm (17.2″) H: 177 mm (7″), Rack Unit: 4U
  • Weight: 7.8 kg (17 lbs.)
  • Input Power: 100 to 250 VAC, 50/60 Hz auto ranging. Fuse: 2A
  • Test Voltage: User Selectable: 250, 100, 40, 10, and 1 VAC
  • Max test current: 1A
  • Panel Display: Color LCD with a back light and a touch screen
  • Front Panel: Sealed, anodized
  • Interface: 4 USB 1.1 (3 host/1 device) and 9 Pin RS-232 serial
  • Memory Storage: Internally stores more than 10,000 test results
  • Temperature: Operating: –10°C to 60°C (14ºF to 140ºF), Storage: –20°C to 70°C (-4ºF to 158ºF)


  • 1002A-05015: H and X Lead Set – 5m (16ft.)
  • 1002A-05023: H and X Extensions – 10m (32 ft.)
  • 1002A-07001: Power Cord – 6.09m (20ft.)
  • 1011A-05013: Ground Lead – 5m (16ft.)
  • 1003A-37001: A-B USB Cable – 3.05m (10ft).
  • 2020A-23001: RS-232 Cable – 3.05m (10ft.)
  • 1004A-27003: External USB Drive
  • 1003A-02002: Instruction Manual
  • 2040A-08003: Touch Screen Stylus
  • 2042A-03001: External Zippered Pouch
  • 1002X-07001: Spare Fuse Set, Time Delay 2A (Qty. 5)
  • 2040A-03003: Cable Bag


• 1003N-31001: External Trigger Switch for Tap Changer Testing
• 1002A-05002: Red Extension Cable – 10m (32 ft.)
• T-Rex R: 3 Phase Test Voltage Option for TR-Mark III R 250V
• TR-Mark III 250V: Field Case Version
• 1004N-15002: Annual Warranty Extension


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