Instrument Functions
R&S
®
FSVA/FSV
265Operating Manual 1176.7510.02 ─ 09
with Avg = average trace; Curr = current trace
Until the first statistics cycle is completed (n < c), a preliminary average is dis-
played which represents the arithmetic mean value over all measured sweeps.
With n increasing, the displayed trace is increasingly smoothed since there are
more single sweeps for averaging.
When the first statistics cycle is completed (n = c), the average trace is saved
in the trace memory.
– n > c
In continuous sweep mode after the first statistics cycle, continuous averaging
is performed. The average trace "n" is calculated at each measurement point
according to:
Figure 3-3: Equation 2
with Avg = average trace; Curr = current trace
In single sweep mode, the same formula is valid if the Continue Single Sweep
softkey is pressed.
●
sweep count = 0
In continuous sweep mode, a continuous average is calculated according to Fig-
ure 3-3 with c = 10:
Figure 3-4: Equation 3
with Avg = average trace; Curr = current trace
Due to the weighting between the current trace and the average trace, 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 aver-
aging process after a change of the signal.
●
sweep count = 1
The current trace is displayed. No averaging is performed. This is a special case of
Figure 3-2 with n = 0.
3.2.8.6 Detector Overview
The measurement detector for the individual display modes can be selected directly by
the user or set automatically by the R&S FSVA/FSV. The detector activated for the
specific trace is indicated in the corresponding trace display field by an abbreviation.
The detectors of the R&S FSVA/FSV are implemented as pure digital devices. They
collect signal power data within each measured point during a sweep. The default
number of sweep points is 691. The following detectors are available:
Measurement Parameters
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