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Come eseguire misurazioni VNA accurate su provino
Una misurazione con analizzatore di rete vettoriale (VNA) integrato nel dispositivo di fissaggio prevede il collegamento del dispositivo in prova (DUT) tramite un dispositivo di fissaggio, anziché direttamente alle porte di prova dell’analizzatore. La configurazione di misurazione è costituita da un analizzatore di rete vettoriale, cavi di prova calibrati, interfacce del dispositivo di fissaggio e un collegamento ripetibile del DUT. La procedura inizia con la calibrazione su piani di riferimento di misura accessibili, seguita dalla caratterizzazione del dispositivo di fissaggio e dall’applicazione di adeguate tecniche di correzione degli errori o di de-embedding. Gli ingegneri misurano quindi i parametri di dispersione (parametri S) del DUT nell’intervallo di frequenza richiesto per valutare la perdita di inserzione, la perdita di ritorno e altre caratteristiche RF rilevanti, tenendo conto degli effetti elettrici introdotti dal dispositivo di fissaggio.
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