Doble M5400 Sweep Frequency Response Analyzer

The Doble M5400 Sweep Frequency Response Analyzer (SFRA) is designed to evaluate the mechanical condition of transformers and other winding equipment. By injecting a swept-sine wave signal into the windings and measuring the electrical response, the M5400 identifies internal issues such as winding movement, deformation, shorted turns, open windings, and core faults. Its non-intrusive testing method ensures quick, reliable transformer evaluations without removing them from service, helping prevent costly outages and extend transformer lifespans.

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• Sends excitation signals to the transformer and measures returning signals over a wide frequency range.
• Provides frequency response measurements across a range of 10 Hz to 25 MHz.
• Measures frequency response at logarithmically spaced intervals of 1.2%.
• Auto-scales each measurement for a dynamic range of 80 dB with ±1 dB accuracy.
• Offers the highest combination of dynamic range and accuracy available.
• Equipped with simple, robust test leads meeting IEC standards.

• Operation: Fully software-driven through Doble software.
• Weight: 1.1 kg without accessories; ≤ 5.5 kg including accessories and batteries in carrying case.
• Case Material: NORYL, shock- and scratch-proof thermoplastic.

• Enables early detection of potential transformer faults, reducing costly failures and outages.
• Provides a non-invasive testing approach, allowing equipment evaluation without service interruption.
• Extends transformer lifespan through proactive maintenance and condition monitoring.
• Streamlines troubleshooting and post-fault assessments by delivering precise diagnostic data.

• Routine maintenance checks — SFRA testing using the M5400 can be integrated into transformer maintenance programs to obtain baseline measurements and proactively identify developing issues. Regular testing allows for comparison over time, helping detect changes that may indicate winding deformation, core problems or other potential faults before they lead to costly failures.
• Acceptance testing of new transformers — The Doble M5400 can be used to verify the condition of new transformers upon arrival, ensuring no damage has occurred during shipping or installation. This provides a critical quality control step and establishes a baseline for comparison should future problems arise.
• Troubleshooting potential problems — If a transformer is suspected of having a fault, the Doble M5400 can be used to help pinpoint the exact nature of the problem. By comparing the SFRA test results with a baseline or measurements from similar units, technicians can more readily diagnose issues, saving time and preventing further damage.
• Post-fault analysis — Following a severe fault, this device can assess potential mechanical damage to a transformer’s windings and core, determining its suitability for continued operation. This helps make informed decisions about costly repairs or replacements, reducing the risk of further failure or safety hazards.
• Quality assurance during repairs — The Doble M5400 can be used to ensure that repairs have been performed correctly and that the transformer is restored to its original condition. SFRA testing after repair provides objective evidence of successful restoration, increasing confidence in the transformer’s integrity.