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

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.