Specifications

R
&S
F
S-K40 Measurements & Settings
Software Manual 1161.8209.42 - 04 59
BLANK
The BLANK softkey activates the blanking of the active trace.
Remote DISP:WIND1:TRAC1:STAT
SWEEP COUNT
The SWEEP COUNT softkey activates the entry of the number of sweeps used for
averaging. The allowed range of values is 0 to 32767.
The default setting is 0. The number of sweeps used for averaging is the same for all
active traces in the selected diagram.
The setting of the sweep count in the trace menu is equivalent to the setting in the
sweep menu.
Remote SENS:SWE:COUN 64
SMOOTHING
The SMOOTHING softkey is ON (the softkey is green), the trace on the screen will be
smoothed by the smoothing percentage (see general settings for noise). Toggling this
softkey will have an immediate effect on the active trace on display. Each trace (trace1,
trace2 and trace3) can be smoothed/unsmoothed individually.
The smoothing algorithm used is as follows:
Where: s = the trace sample number, y(s) = the phase noise at sample s, x = the
sample offset from s, and n = the width of the sliding window. When x exceeds the
boundary samples, the boundary sample is used, i.e. if the trace has samples
numbering 0 to 500 then with n = 5 and s = 0 the average is calculated as:
If both trace averaging and smoothing are specified then trace smoothing is applied
first, and averaging is performed on the smoothed trace.
When smoothing is applied to a trace, the original (unsmoothed) trace is still held in
memory. This makes it possible to toggle between a smoothed and unsmoothed trace
without the need to run a new measurement sweep.
Remote DISP:WIND:TRAC:SMO:APER 10
TRACE MATH
The TRACE MATH softkey opens the Trace maths softkey sub menu, where the Trace
Math operations can be specified.