User`s guide

Discussion
The HP 3566A/67A generally puts all results from a measurement in a single file (see example above).
If no options are selected that specify which data to convert, then all results are selected. This has the
effect of copying everything in the source SDF file <sfile> to the destination SDF file <dfile> (and
resampling all data results, if specified). This also has the effect of converting SDF Level 1 files
(previously used HP 3566A/67A) to the newer SDF Level 2 files (now used by HP 3566A/67A).
Data is interpolated only if either the /E, /P, or /L option is specified.
The ability to convert arbitrarily space data (Swept Sine measurements) to linear or log space data
(through resampling) is necessary when importing data to the HP 3563A.
The ability to change the number of points in a data result (through resampling) is required when
importing data into an instrument that supports limited data sizes. For example, the HP 35660A supports
up to 1024 complex points in a data result, whereas the HP 3566A/67A can generate results up to 16 K
real points.
Spline interpolation (/T:S) is useful when converting from a smaller number of points to a much larger
number of points when you want the data to be smoothed. Polynomial interpolation (/T:P) with linear fit
(/N:2) or quadratic fit (/N:3) is faster than a spline fit and is useful when converting to nearly the same
number or fewer points. (Quadratic fit is also good for interpolating to a larger number of points.)
If the data is real, the real part of the data is interpolated. If the data is complex, the magnitude and phase
parts of the data are interpolated separately.
With the /X option, you may specify X values either within the data or outside of the data. If an X value
specified is outside of the data, the curve is extrapolated to fill in points to the specified X value. For log
data, you must specify X values greater than 0.
Sharing Data Between Analyzers
SDFTOSDF
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