SFRA45 Sweep Frequency Response Analyzer

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.

Product Images

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
Import Formats:- .txt, .csv, .xml, .sfra, .pax Export Formats:- .csv, .xml, .xmlx


SFRA45_Brochure v3.0 PDF, 1,725Kb



SFRA45 User Manual v2_10PDF, 825kb
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SFRA45 Comms Manual PDF, 576kb
SFRA45 – Quick Measurement Guide_v2 PDF, 1,020kb

SFRA45 Options, Software and Accessories

COMMS_ICON Communications Interfaces:
  • Standard: RS232, LAN, USB
PROBE_ICON SFRA45 Accessories:
  • SFRA Connection Clamp Set (Standard)
  • SFRA 18m N4L Cable Reel (Standard)
  • SFRA Earth Braids (Standard)
  • SFRA Earth Clamp set (Standard)
  • USB Memory Stick for data storage (Standard)
  • BNC - BNC Connection Cables + BNC T-Piece (Standard)
  • SFRA45 Flight Case (Standard)
  • Battery Charger (Standard)
  • Vehicle Battery Charger Lead (Standard)
  • SFRAComm Analysis Software (Standard)
  • Customer Cable Reel Length up to 50m (Option)
  • Compliant to IEC60076-18 - Sweep Frequency Response Analysis of Power Transformers (See App note: App_note)
EXTENSION_ICON Port Accessory Options:
  • USB to 9 Pin RS232 Serial Converter
CASES_ICON Carry Cases:
  • SFRA Hard Flight Case - SFRA45 hard carry case, ideal for aircraft hold storage (supplied as standard)
CALIBRATION_ICON Calibration and Documentation:
  • Standard Recalibration - SFRA45
  • Spare set of user manuals - Hard copy of user and communications manual
PC_ICON PC Software (Free of charge):
  • SFRAComm - SFRA PC Interface Software, databasing, graphs, real time data display

Application Notes and Related Articles

APP024 - Sweep Frequency Response Analysis of Power Transformers Typical Test Sequences IEC60076-18.pdf

SFRA45 Full Instrument Specification

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