Accurate Sweep Frequency Response Analysis with the Doble M5400

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Sweep frequency response is a major advance in transformer condition analysis, allowing you to “see” inside transformers without costly detanking.

Sweep Frequency Response Analysis (SFRA) is a proven technique for making accurate and repeatable measurements. As compared to the “impulse” technique, SFRA is preferred for frequency domain measurements. It covers the full dynamic range and maintains the same energy level for each frequency, providing accurate, consistent results. A high signal-to-noise ratio across the entire 20 Hz to 2 MHz frequency range ensures valid measurements.

Doble M5400 Sweep Frequency Response AnalyzerThe Doble M5400 is the most effective diagnostic tool on the market for detecting mechanical problems in power transformers.

The Doble M5400 uses sweep frequency response analysis, a proven technique for making accurate and repeatable measurements. The instrument sends an excitation signal into the transformer and measures the returning signals. Comparing this response to baseline and other results (such as from similar units) allows you to identify deviations and confirm internal mechanical problems.


Doble is one brand you can count on, and Protec offers for rent, lease or purchase, all the electrical testing equipment you need to get the job done.