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Wie man genaue VNA-Messungen in der Vorrichtung durchführt
Bei einer Messung mit einem Vektornetzwerkanalysator (VNA) in einer Testvorrichtung wird das Prüfobjekt (DUT) nicht direkt an die Testanschlüsse des Analysators, sondern über eine Testvorrichtung angeschlossen. Der Messaufbau besteht aus einem Vektornetzwerkanalysator, kalibrierten Testkabeln, Schnittstellen der Testvorrichtung und einer reproduzierbaren DUT-Verbindung. Das Verfahren beginnt mit der Kalibrierung an zugänglichen Messreferenzebenen, gefolgt von der Charakterisierung der Testvorrichtung und der Anwendung geeigneter Fehlerkorrektur- oder De-Embedding-Verfahren. Anschließend messen die Ingenieure die Streuparameter (S-Parameter) des DUT im erforderlichen Frequenzbereich, um die Einfügungsdämpfung, die Rückflussdämpfung und andere relevante HF-Eigenschaften unter Berücksichtigung der durch die Testvorrichtung hervorgerufenen elektrischen Effekte zu bestimmen.
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