Doble M5400 Sweep Frequency Response Analyzer

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Doble M5300 Sweep Frequency Reponse Analyzer
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Doble M5400
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M5400 Datasheet Brochure

The M5400 detects mechanical failure or movement of windings due to short circuits, mechanical stresses or transportation. Use it to ensure transformer performance, reduce maintenance cost, and increase the service life of transformers.

The M5400 uses Sweep Frequency Response Analysis, a proven technique for making accurate and repeatable measurements. Pioneered by Doble the sweep approach has become the industry standard and is the preferred method for making frequency domain measurements.

Here's how SFRA works: The M5400 sends an excitation signal into the transformer and measures the returning signals across a broad frequency range. By comparing this response to baseline and other results (such as from similar units), you can identify deviations and confirm internal mechanical problems.
Identifies problems such as:
  • Core movement
  • Winding deformation and displacement
  • Faulty core grounds
  • Partial winding collapse
  • Hoop buckling
  • Broken or loosened clamping structures
  • Shorted turns and open windings


Doble M5400 Specs
Excitation Source:
Channels 1
Frequency Range 10 Hz-25 MHz
Output Voltage 20 V peak-to-peak at 50 Ohms
Output Protection: Short circuit protected
Source Impedance 50 Ohms
Measurement Channels:
Channels: 2
Sampling: Simultaneous
Frequency Range: 10 Hz – 25 MHz
Max. Sampling rate: 100 MS/s
Input Impedance: 50 Ohms
Data Collection:
Test Method: Sweep Frequency
PC Comm: Ethernet USB/Serial
Frequency Range: 10 Hz – 25 MHz
Number of Points: 1000 points (Default) Up to 1800 points (Extended Range)
Point Spacing: 1.2 % Logarithmic
Dynamic Range: >90 dB
Repeatability: ±1 dB to –80 dB
IF Bandwidth: < 10% of active frequency
Data Display:
Scaling: Linear/Log
Frequency Range: 10 Hz – 25 MHz, user defined within frequency range
Plotting: Frequency vs. Magnitude / Phase
Analysis: Difference, Sub-band Cross-Correlation
Physical Specifications:
Dimensions: 18.2 x 13.4 x 6.7 inch
46.2 x 34.0 x 17.0 cm
Weight: 13.1 lbs
Power Supply: 100-240V AC
Temperature: 0° to 50° C operating, -25° to + 70° C storage
Relative Humidity: 0% to 95 % non condensing