Common Analysis and Display Functions
R&S
®
FSMR3000
219
User Manual 1179.0116.02 ─ 02
Trace Mode
Description
Min Hold
The minimum value is determined from several measurements and displayed. The
R&S
FSMR3 saves the measurement result in the trace memory only if the new value
is lower than the previous one.
Average
The average is formed over several measurements and displayed.
determines the number of averaging procedures.
View
The current contents of the trace memory are frozen and displayed.
If a trace is frozen ("View" mode), the measurement settings, apart from scaling set-
tings, can be changed without impact on the displayed trace. The fact that the dis-
played trace no longer matches the current measurement settings is indicated by a yel-
low asterisk on the tab label.
If you change any parameters that affect the scaling of the diagram axes, the
R&S
FSMR3 automatically adapts the trace data to the changed display range. This
allows you to zoom into the diagram after the measurement to show details of the
trace.
How Many Traces are Averaged - Sweep Count + Measurement Mode
In "Average" trace mode, the sweep count and measurement mode determine how
many traces are averaged. The more traces are averaged, the smoother the trace is
likely to become.
The algorithm for averaging traces depends on the measurement mode and sweep
count.
●
sweep count = 0
(default)
–
In
"Continuous"
measurement mode, a continuous average is calculated for
10 measurements, according to the following formula:
10
*
9
MeasValue
Trace
Trace
old
Figure 8-9: Equation 1
Due to the weighting between the current trace and the average trace, past val-
ues have practically no influence on the displayed trace after about ten mea-
surements. With this setting, signal noise is effectively reduced without need for
restarting the averaging process after a change of the signal.
–
In
"Single"
measurement mode, the current trace is averaged with the previ-
ously stored averaged trace. No averaging is carried out for the first measure-
ment but the measured value is stored in the trace memory. The next time a
measurement is performed, the trace average is calculated according to the fol-
lowing formula:
2
MeasValue
Trace
Trace
old
The averaged trace is then stored in the trace memory.
Trace Configuration