System Overview
R&S
®
CMW500
64
User Manual 1173.9463.02 ─ 02
4.3.4 Statistical Results
The R&S CMW500 repeats the measurements according to the selected statistic count
and repetition mode; see
. Consecutive measurement values are
stored and used to calculate statistical results. The following sections describe the cal-
culation of statistical results in detail.
4.3.4.1
Statistics Type
The statistics type defines how the R&S CMW500 calculates the displayed values if the
measurement extends over several measurement intervals. Assume that a trace or a bar
graph contains a series of different measurement points. After n consecutive measure-
ment intervals, the instrument has collected n complete traces, corresponding to n mea-
surement results at each point. The different statistics types are calculated as follows:
●
Current:
The current trace, i.e. the last result at all measurement points
●
Minimum:
The smallest of the n collected values at each measurement point
●
Maximum:
The largest of the n collected values at each measurement point
●
Average:
At each test point, a suitably defined average over all collected values is
displayed; see
.
●
Standard Deviation:
At each test point, the root mean square deviation of all col-
lected values from the "Average" value is displayed; see
Fig. 4-1: Statistics Types
Differences between statistical calculations
Minimum/Maximum and Average results are calculated differently if the measurement
extends over more than one statistics cycle (repetition mode "Continuous", measurement
time longer than one statistics cycle):
●
The "Minimum" and "Maximum" values represent the smallest and largest values ever
measured.
●
The "Average" result is referenced to the last statistics cycle; see
.
The statistics type of the displayed trace generally belongs to the display configuration
settings in the measurement configuration dialogs. For single measurement results, the
R&S CMW500 often displays a table with all statistics types.
Measurements
