Agilent Technologies 8753ET User Manual page 61

Making Measurements
Measuring Electrical Length and Phase Distortion
When you increase the aperture, the analyzer removes fine grain variations from the
response. It is critical that you specify the group delay aperture when you compare
group delay measurements.
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:
SMOOTHING APERTURE
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
1-48
5
x1