Raytech TR Spy MK III (Transformer Turns Ratio Meter)

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Model TR-Spy Mark III

Fully Automatic Three Phase Transformer Turns-Ratio Meter

Download TR-Spy Mark III.pdf


Model: TR-Spy Mark III

Size: L: 18. 5" (470mm) W: 14.6" (371mm) H: 7.5" (190mm).

Weight: 9.5 kg (21 lbs.)

Input Power: 100 to 250 VAC 47-63 Hz, auto ranging, Fuse: 2A

Test Voltage: User selectable: 100, 40, 10 and 1 Vac, 1A (250VAC output optional)

Panel Display: Color LCD with back lighting and touch screen

Front Panel: Sealed anodized

Interface: 9 pin RS232 serial / 2 USB 1.1 (1 host, 1 device)

Memory Storage: Stores over 10,000 complete test results

Ratio Range: 0.8…16,000

Operating Temperature: -10° C to 60° C

Storage Temperature: -20° C to 70° C


Features / Standard Items

  • 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
  • Simple touch screen operation
  • Graphical tap changer display
  • Tap changer interface
  • Load on test object <0.05 VA
  • Measures power transformers PTs and CTs
  • Displays % error vs. name plate value
  • Automatic phase vector detection
  • Enhanced heavy-duty protection circuitry
  • Emergency stop push button immediately turns off output
  • Internal printer
  • Data storage of over 10,000 measurements
  • Data exchange with USB-key
  • Mounted in rugged case for field-testing
  • 5 Year standard warranty


Cable Set / Accessories

H and X lead-set – 5m each

H and X extensions – 10m each

Safety ground, power cord

External USB-key, USB and RS-232 Cable

Instruction manual, printer paper (5 rolls)

Cable bag

Optional Accessories

SM 201 External test switch for Tap changer testing.

SM 202 Extended cable lengths (user specified in 30 foot increments).

SM 206 Test with three-phase voltage.

SM 207 Verification Box - Verification of turns ratio and excitation current 

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Sunstate Electrical Pty Ltd
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Electrical Contractor Licence No. 7879

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Electrical Contractor Licence No. 75938

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