UNI-T UT225B Wireless High & Low Voltage Transformer Turns Ratio Testers

UNI-T UT225B Wireless High & Low Voltage Transformer Turns Ratio Testers

The UNI-T UT225B presents itself as a purpose-built solution for swift, non-intrusive on-site transformer turns-ratio testing, merging rugged construction with user-centric ergonomics. Encased in a robust red-and-grey polypropylene shell, the handheld tester measures just 78 × 165 × 42 mm and weighs approximately 800 g, striking a balance between portable lightness and confidence-inspiring solidity . Its pistol-style grip flows into a flared base, enabling secure one-handed operation even when wearing protective gloves or working within cramped switchgear assemblies.

Dominating the front face is a high-contrast, backlit LCD panel flanked by five responsive membrane buttons. Each key delivers a positive tactile click, allowing technicians to navigate through measurement modes without diverting attention from the display. A slender, fold-out antenna sits discreetly atop the unit, ready to extend for uninterrupted wireless communication from the primary current transformer (CT1) at distances of up to 100 m .

The UT225B’s dual-clamp architecture comprises a high-voltage CT1 with a 48 mm jaw opening for conductors up to 35 kV systems, and a low-voltage CT2 featuring a 32 mm jaw and five interchangeable 1 m leads for precise secondary current capture. Both clamps exhibit matte-textured surfaces and reinforced hinge assemblies, ensuring smooth, repeatable engagement and reliable alignment around live conductors. Color-coded connectors snap positively into the tester’s rear-mounted ports, while a rugged nylon carry bag and an insulated extension stick safeguard components during transport.

Ergonomic contours and a rubberized side-boot enhance grip, dampen impacts, and protect internal circuitry from accidental drops. An intelligently recessed battery compartment secures eight AAA cells, delivering up to 30 hours of continuous operation under typical field conditions. Throughout its form, from balanced weight distribution to reinforced chassis ribs, the UT225B communicates durability and precision readiness, embodying a tool engineered for the rigors of modern power-system diagnostics.

Features:

• Strong anti-interference design for stable readings in electrically noisy environments.
• Wireless transmission of primary-clamp data up to 100 m from the host unit.
• Data Hold function to freeze the display for convenient reading.
• On-board Data Storage of up to 3 000 test records, with Data Review and Data Upload (via USB).
• High-precision measurement circuitry ensuring accurate turns-ratio readings.
• Overflow (“OL”) display and No-Signal indication for easy fault detection.
• Auto Power-Off after approximately 15 minutes of inactivity to conserve battery.
• USB Communication interface for PC connectivity.
• Sampling Rate of 3 readings per second for fast data capture.
• Insulation-Rod compatibility (withstand voltage up to 110 kV) for safe high-voltage work.

Specifications:

Applications:

• On-site transformer turns-ratio testing.
• Live current transformer (CT) testing.
• Verification of CT wiring correctness.
• Inspection and fault diagnosis.
• Routine testing.
• Quality control.

Package Include:

• 1x Tester (main unit)
• 1x Primary current transformer (CT1)
• 1x Secondary current transformer (CT2)
• 1x Tool bag
• 1x Insulation stick
• 1x USB communication cable
• 8x  AAA alkaline dry batteries (1.5 V)
• 1x User manual

UNI-T  UT225B Documents:

• Datasheet 
• User Manual