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NI Spectral Measurements Toolkit User Guide 26 ni.com
Averaging Options
Figure 10 illustrates the options available for spectrum averaging.
Figure 10. Spectrum Averaging Options
The averaging processes apply weighting to the < > operator in both RMS
and vector averaging as shown in the following equation:
Y
k
= <X>
k
= a
1
× Y
k – 1
+ a
2
× X
k
where Y
k
is the new average, Y
k – 1
is the previous average, and X
k
is the new
measurement.
For linear weighting,
a
1
= (k – 1)/k, and a
2
= 1/k
For exponential weighting,
a
1
= (k – 1)/k and a
2
= 1/N for k ≤ N,
a
1
= (N – 1)/N and a
2
= 1/N for k > N
where N is a user-specified constant that determines how much weight
is given to recent data relative to older data. Small values of N place more
Exponential
Average Size
Peak-HoldNo Averaging VectorRMS
Averaging
Type
Linear
Weighting
Type
Linear
Weighting
Mode
Moving Average
Auto Restart ContinuousOne Shot