Signal Recovery- Frequency Response Analyzer-Four Analyzer Channels (Model:1254A)

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The model 1254A Frequency Response Analyzer (FRA) delivers accurate measurement of gain and phase. The device under test is stimulated by a sinewave and the response analyzed at one, two or more points in the system. These responses are then correlated with the stimulus to determine the amplitude and phase relative to the generator. The ratio of the two measured signals can then be used to provide the system transfer function.

This process rejects all harmonics and, by increasing the integration time, even signals which are buried in noise can be measured accurately.

The 300 V range on the 1254A is particularly useful for making measurements on fuel cell stacks and high voltage batteries, used in hybrid vehicles and residential power supplies. Key product features include:-

  • AC amplitude range – 10 mV to 10 V, for power supply testing
  • Analyzer range 30 mV – 300 V, i.e. suitable for ATS (Automated Test Systems), power station vibration testing
  • Noise rejection capability
  • Synchronizer option enabling generator and carrier signals to be locked in terms of frequency / phase
  • Ability to analyze non-linear systems
  • Front panel or software (Visual Basic) control
  • Modulator / demodulator card option for interfacing to AC carrier systems

Measurement of impedance has become an important tool in the study of electrochemical/biological phenomena and material properties.

The 1254A together with a potentiostat such as the model 1287A, can be used in a wide range of applications, including:-

  • Corrosion and inhibitor studies
  • Analysis of organic and inorganic coatings and films
  • Research into solid electrolytes for oxygen sensors/fuel cells
  • Development of novel anode/cathode materials and electrolytes
  • Bioanalytical research into plant/soil properties

Materials Testing
When combined with a 1296 Dielectric Interface and temperature test equipment the 1254A can be used to test a wide range of materials, such as:-

  • Supercapacitor/battery/fuel cell materials
  • Charge transport in semiconductors, organic crystals, ceramics etc.
  • Analysis of chemical reactions, polymerization and curing processes
  • Novel gas and liquid sensors
  • Characterization of ferro/piezoelectric and semiconductor materials

Control Systems
A standard use for a FRA is to generate a signal which is connected to a signal converter (this may take many forms; e.g. hydraulic, pneumatic or electrical), which forces controlled movement to take place (e.g. displacement transducers used in aerodynamic tests). These are placed on the system under test and the output signal fed back to the FRA via a sensor, enabling the system to be characterized. Typical uses include:-

  • Automated test systems
  • Power supply testing
  • Aircraft instrumentation/system controls
  • Aerodynamic tests – study of applied forces to wing structures
  • Car shock absorbers
  • Weapons guidance systems
  • Rocket propulsion and vectoring technology

The synchronizer option enables the generator to be locked to a rotating / reciprocating component, and measurements can then be made relative to this. Applications include turbine analysis – using harmonics to enable crack detection.

Modulator / Demodulator
This optional card allows the user to superimpose an external modulator signal onto the 1250 generator signal which acts as a carrier. This modulation signal can then be demodulated through the analyzer inputs. Applications include telecommunications and automated test systems.


Waveform Sine, square or triangle
Amplitude 10 mV to 10.23 V rms
Maximum AC resolution 10 mV
DC Bias Range ±10.23 V
Maximum DC resolution 10 mV
Output impedance 50 Ω±1%
Max output current ±100 mA peak
Frequency range 10 µHz to 65 kHz
Max resolution 10 µHz
Error: ±100 ppm
Distortion 2%
Stability 24 hrs ±1ºC
±10 ppm
Sweep types Frequency (logarithmic or linear)
Amplitude (linear)
DC bias (linear)
10000 points
200 points
Maximum voltage hi to lo ±46 V peak
Maximum voltage lo to ground 150 V peak
Maximum current ±100 mA peak
Impedance lo to ground 100 kΩ // 100 pF
Single BNC, floating shield
floating, 4mm
floating, BNC
Protection Output is short-circuit protected

Four independent analyzers operating in parallel


Dynamic range

FS Peak Input

Common Mode Rejection

30 mV

1 µV (90 dB)

45 mV

30 V

300 mV

10 µV (90 dB)

500 mV


3 V

100 µV (90 dB)

5 V

30 V

30 V

1 mV (90 dB)

50 V

500 V

300 V

10 mV

500 V

500 V

Inputs protected to ±500 V (300 V rms). hi or lo to ground
Coupling DC or AC (-1 dB at 2.5 Hz)
Input impedance hi or low to ground 1 MΩ, 35 pF
Cross-channel isolation @ 10 kHz 100dB (1kΩ across inputs)
Measurement delay 0 to 105 s

Displayed Results

Variable Frequency, AC amplitude, DC bias
Measured parameters Voltage gain, phase, real, imaginary, Z, R, X, Y, G, B, V, I group delay, C, L, Q, D
RS232 & GPIB (IEEE-488) For instrument control or for directly driving attached plotter using HPGL language
Power Requirements
Voltage 90 to 127V, 188 to 265 VAC
Frequency 45 to 440 Hz
Power 210 VA
Width 432 mm (17")
Depth 573 mm (22.56")
Height 176 mm (6.93")
Weight 18 kg (40 lbs)
Operating Temperature Range 0 to 50ºC (32 to 122ºF)

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