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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.
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.
Upper trace shows original frequency response
data. Lower trace shows curve fit to a portion of the
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.