9 Programming the Instrument
9.3 SCPI Operation and Results Query
Smoothing With 401 Trace Points and 31 Smoothing Points
Refer to the illustration above for a discussion of this end-point smoothing
phenomena. With 31 smoothing points and a 401 point trace, point 16 will be the
first point to have full 31-bucket smoothing. Likewise, point 386 will be the last point
with full 31-bucket smoothing. Under the conditions stated, points 2 through 15 will
be smoothed as follows: Point 2 is derived from averaging buckets 1 through 3.
Point 3 is derived from averaging buckets 1 through 5, Point 4 is derived from
averaging buckets 1 through 7, and so forth until point 16 is reached. The quantity
of buckets used for the smoothing running average increases at the rate of 2
buckets per point, from point 1 to point ([smoothing number+1]/2), at which time
the full number of smoothing points is utilized. The same characteristic occurs at the
completion of the trace, beginning at point 386, beyond which the number of
averaging buckets begins to decrease until point 401 is reached.
By replacing the value of each point in a trace with the average of the values of a
number of points centered about that point, any rapid variations in noise or signals
are smoothed into more gradual variations. It thereby performs a function similar to
reducing the video bandwidth without the corresponding changes in sweep time; as
such, frequency resolution is decreased. Also, signal peaks are reduced with large
smoothing values. This can cause the amplitude to appear to be less than its actual
value.
9.3.3.8 Number of Points for Smoothing (Remote Command Only)
Included for ESA compatibility. Not recommended for new designs. Use
:CALCulate:DATA:COMPress instead.
Vector Modulation Analyzer Mode User's &Programmer's Reference 2568
To Next Page
Loading...
Need help?
General
