Specifications

R
&S
F
S-K40 Measurements & Settings
Software Manual 1161.8209.42 - 04 58
For a sweep count = 0 , a running average is calculated according to the following formula:
TRACE =
9 * TRACE + meas. value
10
Due to the weighting between the new measured value and the trace average, past
values have practically no influence on the displayed trace after about ten sweeps.
With this setting, signal noise is effectively reduced without need for restarting the
averaging process after a change of the signal. If the sweep count is >1, averaging
takes place over the selected number of sweeps. In this case the displayed trace is
determined during averaging according to the following formula:
n-1
TRACE
n
= 1/n [ (T
i
) + meas. value
n
]
i=1
where n is the number of the current sweep (n = 2 ... SWEEP COUNT). No averaging
is carried out for the first sweep but the measured value is stored in the trace memory.
With increasing n, the displayed trace is increasingly smoothed since there are more
single sweeps for averaging.
After the selected number of sweeps the average trace is saved in the trace memory.
Until this number of sweeps is reached, a preliminary average is displayed.
After completion of averaging, ie when the averaging length defined by SWEEP
COUNT is attained, a running averaging is continued with CONTINUOUS SWEEP
according to the following formula:
TRACE = (N – 1) * TRACE
old
+ meas.Value
N
Where Trace = new trace
Trace
old
= old trace
N = SWEEP COUNT
The display "N of N" does not change any more until a new start is triggered.
In the SINGLE SWEEP mode, the sweeps are stopped when the selected number of
sweeps is attained. The number of the current sweep and the total number of sweeps
are shown on the display: "3 of 200".
Remote DISP:WIND1:TRAC1:MODE
VIEW
The VIEW softkey freezes the current contents of the active trace memory and
displays it. If a trace is frozen by VIEW, the instrument settings can be changed without
the displayed trace being modified.
The display settings such as Y axis and Trace Offset settings can be still changed,
R&SFS-K40 automatically adapts the measured data to the changed display range.
Remote DISP:WIND1:TRAC1:MODE