Agilent Technologies InfiniiVision 2000 X-Series - Page 180

180 Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide
13 Measurements
The mean is calculated as follows:
where:
• x = the mean.
• N = the number of measurements taken.
• x
i
= the ith measurement result.
The standard deviation is calculated as follows:
where:
• σ = the standard deviation.
• N = the number of measurements taken.
• x
i
= the ith measurement result.
• x = the mean.
-2σ
PHDQ
-1σ 1σ
2σ

-3σ



3σ
x
¯
=
∑
i=1
N
x
i
N
σ =
∑
i=1
N
(
x
i
− x
¯
)
2
N