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 |
| Brochures | Documentation |
| SFRA45_Brochure PDF, 1,725Kb | SFRA45 User Manual v2_10PDF, 825kb |
| SFRA45 Comms Manual PDF, 576kb | |
| SFRA45 – Quick Measurement Guide_v2 PDF, 1,020kb |
SFRA45
SFRA45 Options, Software and Accessories
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Communications Interfaces: |
- Standard: RS232, LAN, USB
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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)
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SFRA Standards Compliance |
- Compliant to IEC60076-18 – Sweep Frequency Response Analysis of Power Transformers (See App note: App_note)
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Port Accessory Options: |
- USB to 9 Pin RS232 Serial Converter
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Carry Cases: |
- SFRA Hard Flight Case – SFRA45 hard carry case, ideal for aircraft hold storage (supplied as standard)
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Calibration and Documentation: |
- Standard Recalibration – SFRA45
- Spare set of user manuals – Hard copy of user and communications manual
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PC Software (Free of charge): |
- SFRAComm – SFRA PC Interface Software, databasing, graphs, real time data display
Application Notes and Related Articles
For application notes please see the app note section of our Knowledge Database
| MEASUREMENT SPECIFICATION | |
|---|---|
| Frequency Response Analyser | |
| Measurement | Magnitude, Gain (CH1/CH2, CH2/CH1), Gain (dB), Offset Gain (dB), Phase (º) |
| Frequency Range | 5Hz – 45MHz |
| Gain Accuracy in dB | 0.02dB ‹ 50kHz 0.02dB + 0.05dB / MHz < 5MHz 0.1dB + 0.04dB / MHz < 45MHz |
| Phase Accuracy | 0.025º < 10kHz 0.07º + 0.0009º / kHz < 5MHz 5.05º + 0.0001º / kHz < 45MHz |
| Frequency Source | Generator |
| Measurement | Real Time DFT, no missing data |
| Speed | Up to 100 readings per second |
| Filter | Selectable from 0.2 seconds |
| Resolution | 5 or 6 digits |
| Input Impedance | 50 Ohm or 1M Ohm High Impedance (Selectable) |
| Dynamic Range | 120dB |
| L C R Meter | |
| Functions | L,C,R (AC), Q, Tan Delta, Impedance, Phase – Series or Parallel Circuit |
| Frequency Range | 5Hz to 5MHz |
| Current Shunt | 50R Internal or External |
| Ranges | Inductance Capacitance Resistance |
| Basic Accuracy | 0.5% + 2%/MHz |
| Sweep Capability | All AC functions |
| Impedance Range | 100m Ohm to 100K ohm |
| True RMS Voltmeter | |
| Channels | 2 (Ground Referenced) |
| Frequency Range | 5Hz to 5MHz |
| Measurement | AC, RMS, PEAK, CF, SURGE, dBm |
| Basic Accuracy (AC) | 0.05% range + 0.05% reading + 0.1mV < 1kHz 0.15% range + 0.15% reading + 0.1mV < 10kHz 0.5% range + 0.5% reading + 0.025%/kHz + 0.4mV < 5MHz |
| Signal Generator | |
| Type | Direct Digital Synthesis , Single Frequency or Sweep |
| Frequency | 5Hz to 45MHz |
| Waveforms | Sine, Square, Triangle, Ramp, White Noise |
| Accuracy | Frequency 5ppm over all temperature range Amplitude ±5% < 10MHz Amplitude ±10% < 45MHz |
| Impedance | 50 Ohm ± 2% |
| Scaling | 1 x 10^-9 to 1 x 10^9 |
| Output Level | 50mVpk to 10Vpk |
| INPUT RANGES | |
| Inputs | 2 x 10Vpk |
| Connectors | Ground referenced BNC |
| Coupling | AC |
| Max Input | 10Vpk from Earth |
| Input Ranges | Peak ranging 1mV, 3mV, 10mV, 30mV, 100mV, 300mV, 1V, 3V, 10V |
| Scaling | 1 x 10^-9 to 1 x 10^9 |
| Ranging | Full auto, Up only or Manual |
| Input Impedance | 50 Ohm or 1M Ohm High Impedance Selectable |
| ACCESSORIES AND PORTS | |
| Instrument Accessories | |
| Probes | 2 x Probes |
| Leads | 3 x BNC to BNC (Output, CH1, CH2), RS232, Power |
| Software | CommView, SFRAComm |
| Documentation | Calibration Certificate, User Manual |
| Newtons4th SFRA Transformer Connection System | |
| Bushing Clamps | 2 x Bushing Connection Clamps |
| BNC Cable Reel | N4L 18m Cable reel (Signal, CH1, CH2) |
| Earth Braid | 2 x 5 metre Earthing Braid |
| Earth Clamps | 2 |
| Spare Earth Braid | 2 x 500mm |
| USB Memory Stick | 2 GB |
| SYSTEM SPECIFICATIONS | |
| Sweep | |
| Functions | FRA, Impedance |
| Steps | Up to 2000 Steps |
| Window | From 50ms with no gap between each log |
| Memory | 1 GB Internal or External USB |
| General | |
| Display | 5.7″ 1/4VGA Colour high brightness backlit |
| Dimensions (Instrument) | 305H x 230W x 45D mm “Tablet Style” |
| Weight (Instrument) | 2.7Kg |
| Dimensions (Carry Case) | 760mm x 420mm x 150mm |
| Weight (Full system including case) | 14.9Kg |
| Program Stores | 100, Location 1 loaded upon power up |
| Sweep Stores | 2000, all parameters in any sweep function |
| Import Formats Supported | .txt .csv .xlm .sfra .pax |
| Export Formats Supported | .csv .xlm .xmlx |
| Remote Operation | Full Capability, Control and Data |
| Operating Temperature | -5 to 50ºC |
| Storage Temperature | -10 to 60ºC |
| Relative Humidity Range | 20 to 90% Non-Condensing |
| IP Protection of Inputs and Outputs | IP30 – CEI EN 60529 |
| Max Altitude | 2,000 Metres |
| Power Supply | 9-18V @ 3A, AC adapter or 12V dc from car or external batteries |
| Warranty | 3 Years |