How the DOBLE M5400 Sweep Frequency Response Analysis is the best SFRA Kit?

How the DOBLE M5400 is the best SFRA Kit?

Discover the Doble M5400, Sweep Frequency Response Analysis:

DOBLE’s M5400, a Sweep Frequency Response Analysis test set, has a practical use in the inspection of equipments which possess windings.

Popular/common examples of these types of equipments are power transformers and reactors.

The M5400 is used on the equipments to ascertain their mechanical integrity because the winding movements can be known by measuring the frequency at which a winding responds.

The working of the M5400 is unique in its operation as it operates on an input-output signal measurement.

Firstly, it sends input parameters to the transformer as excitation signals and measures the output parameter as returning signals.

These response measurements are then compared with baseline readings as well as results obtained from similar transformer equipments.

Thus, this allows for easy identification and detection of deviations from the baseline readings and recorded as mechanical problems.

This manner of approach to inspection of power transformers by the M5400 makes fault finding easy.

Also, it reduces uncertainty of establishing an equipment’s apparent working condition as it provides test results evidence of winding movements.

In addition to this, it gives an overview of the rate at which a transformer deteriorates and if, after a fault, is still workable.

Furthermore, this testing approach of the M5400 helps to investigate if a transformer being transported has been damaged during transit.

A recommendation of this type of testing is in its application on equipments at certain points to obtain baseline readings.

This serves as a strong point for the DOBLE M5400 because it justifies its usefulness in applications.

Hence, the recommendation to perform tests on equipments after transportation, system faults, during factory tests, crane delivery or normal maintenance.

These tests provide baseline readings to be compared with during evaluations made in the future to check for mechanical integrity.

What are the 8 Advantages of using the DOBLE M5400?

  1. It is a non-intrusive or non-invasive test technique
  2. It helps to diagnose and detect problems early.
  3. It helps prevent or avoid failure of expensive equipments.
  4. It allows the user to take control of the health and operational conditions of the equipments.
  5. The M5400 is a field-ready instrument offering highly reliable measurements.
  6. It has a frequency measurement from 10Hz to 25MHz.
  7. Frequency response is measure logarithmically at spaced intervals of 1.2%.
  8. It gives details about the interconnections that is, Leads and Tap Changers.

How the M5400 gives you Benefits?

  1. It ensures adequate transformer performance.
  2. It reduces the costs of maintenance.
  3. It helps to increase the transformer’s service lifespan.
  4. Its flexibility allows for testing equipments at any time if a fault is suspected or as part of a routine maintenance check.
  5. Measurements made can be repeated such that any changes observed can be used for diagnostic purposes.

How the M5400 detects problems?

  • Deformation of winding and displacement
  • Core movement
  • Hoop buckling
  • Faulty core grounds
  • Open windings and shorted turns
  • Loosened or broken clamping structures
  • Collapse of partial winding

Additional Information

The Sweep Frequency Response Analysis software allows the user the following benefits.

  • Full control of and operation of the DOBLE M5400
  • Comparing and analysing SFRA measurements.
  • Identification of deviations as well as confirmation of internal mechanical problems.
  • Preconfigured templates.

M5400 SFRA Technical Specifications

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
Calibration Interval:     3 years
Measurement Channels:
Channels:                                2

Sampling:                    Simultaneous
Frequency Range:                   10 Hz – 25 MHz
Max. Sampling rate:    100 MS/s
Input Impedance:                     50 Ohms
Calibration Interval:     3 years


Data Collection:

Test Method:               Sweep Frequency

PC Comm:                  Ethernet USB/Serial

Frequency Range:                   10 Hz – 25 MHz

Number of Points:       1000 points (Default)

Up to1800 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 defned 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 (6.0 kg)

Power Supply:            100-240V AC

Temperature:               0° to 50° C operating,
-25° to + 70° C storage

Relative Humidity:      0% to 95 % non-condensing

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