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Making Measurements
Measuring Electrical Length and Phase Distortion
Figure 1-38 Group Delay Example Measurement with Smoothing
5. To increase the effective group delay aperture, by increasing the number of
measurement points over which the analyzer calculates the group delay, press:
As the aperture is increased the “smoothness” of the trace improves markedly, but at
the expense of measurement detail.
Figure 1-39 Group Delay Example Measurement with Smoothing Aperture
Increased
Group delay is calculated by dividing the phase difference between points by the frequency
spacing. Thus, if n equals the number of points, the number of phase difference values (or
frequency segments) will be n−1. The first data point is repeated so that the total number
of points remains n.
5 x1
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