Megger TTRU1 Handheld Transformer Turns Ratio Tester | Single-phase measurement, up to 62.5 V induced, ±0.05%, IP54, approx. 1 kg

Megger TTRU1 Handheld Transformer Turns Ratio Tester: Single-Phase Measurement, Battery Operated

Overview

The TTRU1 is a Megger handheld transformer turns ratio tester that uses a single-phase source to measure the ratio of distribution, power and instrument transformers (CT/PT); three-phase transformers are measured phase by phase. Current manufacturer models are the TTRU1-BASIC and TTRU1-ADV; the ADV adds short-circuit and open-circuit Go/No Go tests and a custom vector list.

Key Specifications

• Measurements: Ratio, excitation current, additive/subtractive polarity
• Ratio accuracy: 25–50 V: 0.8–1000 ±0.05%, up to 2000 ±0.10%, up to 15000 ±0.30%; 1–24 V: 0.8–1000 ±0.10%
• Output: Single-phase 1–50 V; 0.1 mA–1 A; 40–480 Hz
• Model differences: BASIC induces 37.5 V (approx. 2 MVA); ADV induces 62.5 V (approx. 10 MVA)
• Display and data: 3.5-inch color LCD; stores 10000 single-phase results; USB export
• Power: 6 × AA (USB-C rechargeable NiMH included), approx. 1000 ratio tests per charge
• Standards and protection: IEC 61010-1; IEEE C57.152-2013, IEC 60076-1:2011; IP54
• Dimensions and weight: 22.8 × 10.5 × 7.5 cm, approx. 1 kg

Applications

• On-site ratio and polarity checks of distribution transformers and CTs/PTs.

Specifications per the Megger product page and TTRU1 BASIC/ADV datasheet (V08) (retrieved 2026-10-21).