R&S®Power Viewer Plus Software Manual - Rohde & Schwarz
R&S®Power Viewer Plus Software Manual - Rohde & Schwarz
R&S®Power Viewer Plus Software Manual - Rohde & Schwarz
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R&S Power <strong>Viewer</strong> <strong>Plus</strong>Uncertainty CalculationData sheets often express the impedance matching of a device as astanding wave ratio (SWR). The relationship between the SWR and thereflection coefficient is expressed by the following equations:s= 1r L1−r Lr L= s−1s1The example below demonstrates the influence of mismatch caused bya signal source that is directly connected to a power sensor:Load: R&S NRPZ11 SWR = 1.2 r L = 0.09Source: R&S SMBV100A SWR = 1.6 r G = 0.23U dB = 2 · 0.707 · ± 8.7 dB · 0.09 · 0.23 = ± 0.25 dB<strong>Manual</strong> 20
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