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2.8.1.11
Histogram Information
The following is a description of the indicators associated with histogram analysis. Histograms can be plot-
ted in the Data Collection Window by setting the analysis type pull-down menu to Histogram (see
Figure 26). The histogram plot information includes:
• BIN: Displays the x-axis value of the cursor on the histogram.
• MAGNITUDE: Displays the y-axis value of the cursor on the histogram.
• MEAN: Indicates the mean of the data sample set. The mean is calculated using the following
formula:
• STD_DEV: Indicates the standard deviation of the collected data set. The standard deviation is
calculated using the following formula:
• VARIANCE: Indicates the variance of the current data set. The variance is calculated using the
following formula:
• MAXIMUM: Indicates the maximum value of the collected data set.
• MINIMUM: Indicates the minimum value of the collected data set.
32
n 1
–
i
=
-------------------------- -
MEAN
=
n
n 1
–
i
=
0
STDDEV
=
----------------------------------------------------- -
n 1
–
i
=
0
----------------------------------------------------- -
VARIANCE
=
Figure 26. Histogram Analysis
X i
0
2
X i Mean
–
n
2
X i Mean
–
n
CDB5490U
DS923DB5
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