Phase Samples - HP 8753E User Manual

The phase response shown in F'igure 2-32 is undersampled; that is, there is more than HO0
phase delay between frequency points If the A4 2 HO", incorrect phase and delay information
may result. Figure 2-32 shows an example of phase samples being with A+ less than MO0 and
greater than MOO.
Undersampling may arise when measuring devices with long electrical length. 'Ib correct this
problem, the frequency span should be reduced, or the number of points increased until A4 is
less than 180" per point. Electrical delay may also be used to compensate for this effect (as
shown in the next example procedure).
Figure 2-32. Phase Samples