Megger TTRU1 Handheld Transformer Turns Ratiometer (BASIC, ADV, PRO & EXP)
- Fast, accurate transformer testing – Wherever the job takes you
When speed, accuracy, and portability matter, the Megger TTRU1 delivers dependable transformer testing in a truly handheld format. Designed for engineers, utilities, commissioning teams, and maintenance professionals, the Megger TTRU1 combines advanced turns ratio testing with intuitive operation, making it ideal for routine transformer diagnostics in the field.
Whether you are testing distribution transformers, power transformers, CTs, or PT/VTs, the Megger TTRU1 helps reduce downtime, simplify workflows, and improve confidence in every result. With colour-guided leads, a bright LCD interface, automatic result storage, and USB export capability, the Megger TTRU1 is engineered to streamline transformer testing from start to finish.
The Megger TTRU1 is a portable transformer turns ratio tester designed for fast and accurate field diagnostics across a wide range of transformer applications.
Request a quote today or speak to our technical team to find the right Megger TTRU1 model for your application.
Why Choose the Megger TTRU1?
The Megger TTRU1 is purpose-built for fast and repeatable transformer turns ratio testing without the complexity commonly associated with traditional test instruments. Unlike many older systems, the Megger TTRU1 automatically determines the appropriate test voltage, helping operators achieve reliable measurements with minimal setup.
Compact yet powerful, the Megger TTRU1 supports:
- Turns ratio testing
- Excitation current measurement
- Additive/subtractive polarity validation
- Go/No-Go short circuit testing
- Open circuit winding tests
- Data storage and export
- USB-C rechargeable operation
The result is a rugged, field-ready instrument capable of performing up to 1000 TTR tests on a single battery charge.
↑ Smarter Setup. Faster Results.
Designed for Efficient Field Testing
The Megger TTRU1 has been engineered for technicians working in demanding environments. Its lightweight 1 kg construction and heavy-duty over-moulded case make it easy to transport between sites, substations, and transformer installations.
The intuitive full-colour Hi-bright LCD display provides clear on-screen guidance throughout testing, helping reduce setup errors and training requirements. Colour-coded test leads and customisable vector displays allow the Megger TTRU1 to match transformer nameplates quickly and accurately.
With automatic result storage and USB export functionality, the Megger TTRU1 simplifies reporting and record management, enabling seamless transfer to Microsoft Excel or PowerDB software.
Advanced Features That Improve Productivity
✅ Automatic Polarity Recognition
The Megger TTRU1 automatically validates additive and subtractive polarity during testing. This gives operators instant confidence that transformer vector groups and wiring configurations are correct.
✅ Excitation Current Testing
Excitation current measurement is included with every turns ratio test. This enables the Megger TTRU1 to help identify:
- Core balance defects
- Magnetic core problems
- Winding displacement
- Turn-to-turn insulation faults
- Tap changer issues
✅ Go/No-Go Winding Tests
Available on selected models, the Megger TTRU1 provides rapid short circuit and open circuit winding evaluation to quickly identify obvious transformer faults before further investigation.
✅ Advanced Step-Up Transformer Testing
The TTRU1-PRO and TTRU1-EXP models utilise advanced single-phase step-up testing technology that automatically applies the correct test voltage and internal lead compensation. This helps improve repeatability, reduce setup errors, and deliver more reliable transformer ratio measurements in the field.
✅ Phase Deviation Analysis (PRO & EXP)
Phase deviation testing helps identify winding deformation, shorted turns, deteriorated cores, and other developing transformer faults that may not be visible through standard turns ratio measurements alone.
✅ Optional WiFi Data Streaming
With the optional WiFi adapter, selected TTRU1 models can stream results directly to a connected PC for simplified reporting and real-time data management.
✅ Data Storage and Reporting
The Megger TTRU1 stores up to 10,000 single-phase test results internally. Users can export results directly via USB for reporting, archiving, or further analysis.
✅ Long Battery Life
Using rechargeable AA NiMH batteries, the Megger TTRU1 can perform up to 1000 transformer turns ratio tests on a single charge. USB-C charging allows convenient charging from standard wall adapters, laptops, or vehicle power supplies.
Megger TTRU1 Model Comparison
The Megger TTRU1 offers impressive technical capability in a compact handheld design:
| Feature | TTRU1-BASIC | TTRU1-ADV | TTRU1-PRO | TTRU1-EXP |
| Maximum Induced Voltage | 37.5 V AC | 62.5 V AC | 125 V AC | 250 V AC |
| Turns Ratio Accuracy | Up to ±0.05% |
| Maximum Transformer Capacity | Small distribution transformers | Approx. 10 MVA | Approx. 100 MVA | >100 MVA |
| Excitation Current Testing | ✓ | ✓ | ✓ | ✓ |
| Polarity Validation | ✓ | ✓ | ✓ | ✓ |
| Go/No-Go Winding Tests | No | ✓ | ✓ | ✓ |
| Guided Three-Phase Testing | No | No | ✓ | ✓ |
| Phase Deviation Analysis | No | No | ✓ | ✓ |
| Short Circuit Impedance Testing | No | No | No | ✓ |
| Custom Asset Nameplates | No | No | ✓ | ✓ |
| PowerDB Import | No | ✓ | ✓ | ✓ |
| PC Download & Updates | No | No | No | ✓ |
| Internal Storage | Up to 10,000 test results |
| Battery Life | Up to 1000 TTR tests per charge |
| Display | 3.5-inch full-colour Hi-bright LCD |
| Operating Temperature | -20 °C to 50 °C |
| Ingress Protection | IP54 |
| Weight | Approx. 1 kg |
The Megger TTRU1 complies with major international transformer testing standards including IEC 60076-1 and IEEE C57.152.
Built for Utilities and Electrical Maintenance Teams
The Megger TTRU1 is ideal for:
- Utility maintenance departments
- Electrical contractors
- Transformer manufacturers
- Industrial maintenance engineers
- Renewable energy operators
- Commissioning engineers
- Substation technicians
Its combination of portability, ease of use, and advanced diagnostic capability makes the Megger TTRU1 a valuable addition to any transformer testing toolkit.
Available Models:
- TTRU1-BASIC
- 1Ø handheld turns ratiometer – 37.5 VAC
- 37.5 VAC induced handheld turns ratiometer test set with 2 m (6 ft) H and X leads
- TTRU1-ADV
- 1Ø handheld turns ratiometer – 62.5 VAC
- 62.5 VAC induced handheld turns ratiometer and go/no-go winding test set with customisable vector lists and PowerDB import, supplied with 2 m (6 ft) H and X leads
- TTRU1-PRO
- 1Ø handheld turns ratiometer – 125 VAC
- 125 VAC induced handheld step-up turns ratiometer and go/no-go winding test set with phase deviation, customisable vector lists and transformer nameplates, guided three-phase tests, and PowerDB import, supplied with 2 m (6 ft) H and X leads
- TTRU1-EXP
- 1Ø handheld turns ratiometer – 250 VAC
- 250 VAC induced handheld step-up turns ratiometer and short-circuit impedance/leakage reactance test set with phase deviation, customisable vector lists and transformer nameplates, guided three-phase tests, PowerDB import, PC communication, and selected hardware accessories, supplied with 2 m (6 ft) H and X leads
Optional Accessories:
Enhance the testing experience with optional accessories including:
- Extended test leads
- USB printer
- WiFi adapter
- Calibration standards
- Solar and hand-crank charging packs
- Hard transport cases
- Magnetic mounting straps
These accessories help tailor the instrument to specific field and workshop applications.
❓ Frequently Asked Questions (FAQ)
Q1: What does this handheld transformer turns ratiometer test?
A. This instrument performs transformer turns ratio testing, excitation current measurement, polarity validation, and selected winding integrity checks depending on the model configuration.
Q2: Is this unit suitable for field testing?
A. Yes. It has been specifically designed for portable field use with rechargeable battery operation, rugged construction, and an IP54 environmental protection rating.
Q3: Can test results be stored and exported?
A. Yes. The unit can internally store up to 10,000 test records and export data via USB for reporting, analysis, and record keeping.
Q4: Which transformer types can be tested?
A. The instrument is suitable for testing power transformers, distribution transformers, current transformers (CTs), potential transformers (PTs), and voltage transformers (VTs).
Q5: Does it support rechargeable batteries?
A. Yes. The device uses rechargeable AA NiMH batteries and includes convenient USB-C charging capability for easy charging in the office or on-site.
Q6: What is the difference between the BASIC and ADV models?
A. The ADV version adds a higher 62.5 V AC induced test voltage, Go/No-Go winding tests, custom vector storage, WiFi compatibility, and PowerDB import functionality for enhanced reporting and workflow integration.
Q7: Which Megger TTRU1 model is best for advanced transformer diagnostics?
A. For more advanced diagnostics, the TTRU1-PRO adds phase deviation analysis, guided three-phase testing, and custom asset nameplates, while the TTRU1-EXP adds short-circuit impedance/leakage reactance testing and PC communication.
Order Your Megger TTRU1 Today
Improve testing efficiency, reduce setup time, and gain confidence in every transformer diagnostic with the Megger TTRU1. Whether you need a reliable handheld turns ratiometer for routine maintenance or advanced transformer analysis in the field, the Megger TTRU1 delivers professional-grade performance in a portable package.
Contact us today for pricing, availability, demonstrations and expert advice on selecting the right Megger TTRU1 model for your application.