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TDS Rentals & Leasing is your One Stop Shop providing Doble products with Rental, Sales and Lease To Own options plus the benefit of our in-house calibration and repair.


817-465-9494 or email sales@tdsrl.com


doble m5400


 Available Now:  Doble M5400 Sweep Frequency Response Analyzer Test System

Call us at (817) 465-9494 or Email sales@tdsrl.com for more information!


Doble M5400 Equipment Specifications

The M5400 Sweep Frequency Response Analyzer adds a powerful tool to your quality-control and maintenance toolkit, allowing you to “see” inside the transformer and detect even subtle changes in the mechanical structure of the core and windings – without costly detanking. The M5400 is the most effective diagnostic tool on the market for detecting mechanical problems in power transformers.

The 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.


  • Wide frequency range: Provides frequency-response measurement from 10 Hz to 25 MHz; the default range (20 Hz to 2 MHz) covers the most important diagnostic areas: core and magnetic properties; winding movement and deformation; and interconnections (leads and tap changers).
  • High resolution: Measures frequency response at logarithmically spaced intervals of 1.2% with a constant excitation level and can auto-scale each measurement, providing an overall dynamic range of 80 dB with ±1 dB accuracy, for the highest combination of dynamic range and accuracy.
  • Repeatable tests: Frequency response measurements are highly repeatable; even subtle changes can be used for diagnosis.
  • Rugged and portable: Rugged construction provides the accuracy of a laboratory instrument with the ability to withstand harsh field conditions and robust test leads to handle the rigors of site testing.


  • Check new transformers to verify condition
  • Improve the quality of your regular inspection program
  • Combat system problems, such as short-circuit faults that can damage transformers
  • Inspect for damage if the transformer has experienced mechanical stress or after earthquakes, lightning, or other environmental events
  • Eliminate unnecessary detanking and costly internal inspections