Agilent Technologies MSO6012A User Manual page 247

5 Making Measurements
246
-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
σ
i = 1
=
----------------------------- -
N 1 –
where:
σ = the standard deviation.
N = the number of measurements taken.
th
x = the i measurement result.
i
x = the mean.
mean
-2s -1s 0 1s 2s
68.3%
95.4%
99.7%
6000 Series Oscilloscope User's Guide
3s