Raytech TR-1 Single-Phase Transformer Turns Ratio Tester | Ratio 0.8–4,000, ±0.08%, battery or mains, IP67 (lid closed), 3.2 kg

Raytech TR-1 Single-Phase Transformer Turns Ratio Tester: Battery Powered, IP67

Overview

The TR-1 is a single-phase automatic ratio tester from Raytech of Switzerland, designed on the basis of the three-phase TR-MARK III. It measures ratio and excitation current of power transformers, PTs and CTs, and also performs polarity reversal and continuity tests. At power-on it self-calibrates and checks the circuit; if a shorted or disconnected test lead is detected, the test is aborted to protect the instrument. It runs on a rechargeable battery and can also be connected to mains power or an optional vehicle DC adapter. The TR-1P with built-in printer is available on request.

Key Specifications

• Ratio range and accuracy: 0.8–4,000; 0.8–100: ±0.08% of reading ±1 LSD
• Test voltage and current: PT mode 1, 5, 10, 40 VAC, max. 0.1 A; CT mode 1–5 VAC auto-switching, max. 1 A
• Measurements: Ratio, excitation current, polarity reversal, continuity test
• Power: Rechargeable battery, more than 1,000 tests per full charge; 90–264 VAC or 11–14 VDC
• Display and storage: Backlit graphic LCD; rotary knob operation; 50 internal records (TR-1P has a built-in 1.9-inch printer)
• Protection and durability: IP67 with lid closed; withstands a 1 m drop; operating temperature -10 to 55 ℃
• Dimensions and weight: 270 × 246 × 124 mm; 3.2 kg

Applications

• On-site single-phase ratio testing in substations and at project sites.
• PT and CT ratio and polarity checks.

Specifications per the Raytech TR-1 / TR-1P product page (raytech.ch, retrieved 2026-10-23).