Use data tables to display up to 100 selected data points in tabular format. Limit tables allow you to define up to 100 upper and lower limit segments in each display for GO/NO GO testing. Data and limit table definitions can also be saved to and recalled from disk for quick setup.

Synthesis reverses the process: enter a model in any of the above formats and the SR785 synthesizes the required curve. The curve fit/synthesis menu allows you to change gain, delay and frequency scale, set pole and zero locations and instantly see the response of the modeled system.

Upper trace shows original frequency response

data. Lower trace shows curve fit to a portion of the

data.

Curve Fit and Synthesis

The SR785 has a standard 20-pole, 20-zero curve fitter that can fit frequency domain data from both the FFT and swept-sine measurement groups. Curve models can be displayed in pole/zero, pole/residue and polynomial formats.

Enter frequency response models in pole/zero, poly-

nomial, or pole/residue format.

Output

The SR785's built-in 3.5" 1.44 MB disk drive, GPIB and RS-232 computer interfaces and Centronics printer port combine to allow almost unlimited flexibility in saving, printing, plotting or exporting your measurement data. Displays and setups can be printed or plotted to disk, GPIB, RS-232 or Centronics port in PCX, GIF, PCL (LaserJet® and DeskJet® ), dot-matrix, Postscript, HP-GL or ASCII formats. An annotation editor lets you add text, time and date, or filenames to any portion of the plot. For modal analysis applications, nodal degree-of-freedom information is stored with the data files to simplify transfer to external analysis programs.

Data Conversion Utilities

The SR785 contains a complete suite of data conversion utilities for both Windows® and DOS® operating systems. These versatile utilities make data transfer to and from external programs fast and simple. SR785 files can be converted to ASCII for use with spreadsheets, or Universal File Format (UFF) and HP SDF for use with modal analysis programs. SR785 Files can also be converted to MAT file format for use with MATLAB. Conversion from external file types is also supported. Both HP SDF and SR780 files can be converted to SR785 format.

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SRS Labs SR785 manual Curve Fit and Synthesis, Output, Data Conversion Utilities
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SR785 specifications

The SRS Labs SR785 is a powerful and versatile audio analysis tool designed for audio engineers, researchers, and manufacturers. This instrument is renowned for its ability to perform a wide array of measurements, making it an essential asset for anyone involved in audio testing and development. With its cutting-edge features and technologies, the SR785 stands out in the competitive field of audio analysis.

One of the main features of the SR785 is its dual-channel capability, which allows users to analyze both input and output signals simultaneously. This is particularly useful for applications such as loudspeaker testing, where comparing the input signal against the output can provide valuable insights into the performance and fidelity of audio systems. The device supports a wide dynamic range and can capture audio signals from an impressive range of frequencies, ensuring accurate representations of even the most nuanced sounds.

The SR785 employs state-of-the-art Fast Fourier Transform (FFT) technology, enabling users to switch between time-domain and frequency-domain analysis with ease. This flexibility allows engineers to tailor their measurements based on specific requirements, whether they are evaluating distortion levels, frequency response, or impulse response. The instrument’s high-resolution display provides clear visual representations of the analyzed data, making it easier to identify trends and anomalies.

Another notable feature of the SR785 is its built-in automation capabilities. This technology allows for automated testing sequences, streamlining the analysis process and reducing the potential for human error. Users can pre-program a series of tests to run automatically, ensuring consistency in measurements and saving valuable time during testing and analysis.

Additionally, the SR785 offers extensive data storage options, allowing users to save measurement results for future reference or comparison. This is particularly beneficial for long-term studies or for manufacturers conducting quality control checks on production lines. The device is also equipped with a range of connectivity options, including USB and GPIB, facilitating easy integration into existing test setups and enhancing its versatility.

The combination of advanced features, robust technologies, and user-friendly design makes the SRS Labs SR785 a top choice for audio professionals seeking a reliable and efficient audio analysis solution. Whether for research, development, or quality assurance, the SR785 delivers precise and actionable insights that drive sound performance to new heights.
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