Newtons4th – SFRA45 Sweep Frequency Response Analyzer

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Datasheet - SFRA45


The SFRA45 is a Sweep Frequency Response Analyzer with a bandwidth of 5Hz to 45MHz, the SFRA45 offers a fully portable solution for the field of SFRA (Sweep Frequency Response Analysis) which fully complies with IEC60076-18 – Power Transformers Part 18 – Measurement of frequency response.

Featuring an inbuilt colour LCD screen as well as being battery powered, the tablet style instrument can be used with or without PC Software. The dedicated software available (SFRAComm) enables the user to create databases from which historical transformer sweeps can be recalled and compared to current sweeps for analysis. This offers the ability to perform the most common sweep frequency response analysis technique “Fingerprint Comparison” as well as all other comparison techniques.

  • Sweep frequency response analyser
  • Basic 0.02dB with class leading high frequency performance
  • Wide frequency range 5Hz to 45MHz
  • Various measurement modes including FRA, RMS, LCR, Scope
  • High phase accuracy
  • Fully functional LCR meter
  • PC software included
  • RS232, USB and LAN interfaces
  • Protective Aluminium Case

Demystifying SFRA

The Sweep Frequency Response Analyzer simply injects a range of frequencies into a winding of a power transformer, when the power transformer is built correctly with no imperfections and faults the frequency response (of Gain Vs Frequency) plot of that particular type of transformer and winding on that particular transformer should exhibit a particular shape, this “shape” then becomes the transformers “fingerprint”.

Over the course of the transformers lifetime this “fingerprint” can be used in order to detect degradation of the transformer.

When is SFRA performed?

There are three main occasions when SFRA is performed

1. Upon factory quality checking
2. Before a short circuit test
3. Before and After transportation
4. Ongoing scheduled maintenance

Features & Benefits

0.02dB Basic accuracy Frequency range 5Hz to 45MHz
Full Colour VGA Display RS232, LAN and USB
PC Software package included 2Hr Battery Life
Leading Phase Accuracy Truly Portable Measurements
LCR Mode Save Data to external USB
50Ohm or High Impedance Input Scope Function
Save Data to Database for comparison Supplied with all accessories and carry case