Agilent Technologies InfiniiVision 6000 Series User Manual page 253

6000 Series Oscilloscope User's Guide
-3s
The mean is calculated as follows:
N
∑
x
i
i 1
x ------------- - =
=
N
where:
x = the mean.
N = the number of measurements taken.
th
x = the i measurement result.
i
The standard deviation is calculated as follows:
N
2
∑
x x
–
i
i 1
----------------------------- - =
=
N 1
–
where:
= the standard deviation.
N = the number of measurements taken.
th
x = the i measurement result.
i
x = the mean.
Making Measurements
mean
-2s -1s 0 1s 2s
68.3%
95.4%
99.7%
3s
253
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