User Manual

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21.3 Reference
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2
1.3.6 Averaging Equations
Equation
:
n
：
A
veraging count
A
n
：
R
esult of n times averaging
Z
n
：
n-th measurement data
A
n
= { (n - 1)A
n-1
+Z
n
}/
n
Equation
N
：
S
pecified averaging count
n
：
A
veraging count
A
n
：
R
esult of n times averaging
Z
n
：
n
-th measurement data
A
n
= { (N - 1)A
n-1
+Z
n
}/N
For time axis averaging, summing averaging is synchronized by the trigger.
If trigger synchronization is not performed, the results will be meaningless.
In the FFT function, unlike time axis averaging, results are valid also if no
trigger synchronization is used. But if the characteristics of the input
waveform allow triggering, using the trigger for synchronization is
recommended.
■ Summing averaging（sinple averaging in FFT）
Captured data are added sequentially and the sum is divided by the number
of samples.
■ Exponential averaging
Most recent data are given greatest weighting, and the weighting of older data
is reduced with an exponential function.
■ Peak hold (frequency axis)
The specified number of samples are captured, and the peak value is held
(stored) for each frequency.