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2.4 In reality, the band almost always behaves in a different way. If the band
during measurement clearly deviates from a horizontal direction (moves up or
down), it means that spectrum balancing processes are not steady yet (Figure 2.14
illustrates some examples of the unstable band). In order to get more reliable
measurement results you should wait until the band begins moving in a stable
horizontal direction (Figure 2.15 illustrates the examples of a gradual change for a
stable measurement mode).
Figure 2.14 – Unstable trend band
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