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Misurazione TV
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Distanza e livello del portante audio
Le stazioni televisive possono trasmettere su un secondo portante audio
con modulazione FM (analogico) o in formato NIcam (digitale). Ai portanti
audio sono assegnate diverse frequenze, secondo lo standard impostato
(vedi la tabella). Dopo l’inserimento del canale o della frequenza è
sempre impostato il portante audio 1.
Standard TT1 TT2 Nicam
B/G 5,5 MHz 5,74 MHz 5,85 MHz
D/K 6,5 MHz 6,26 MHz 5,85 MHz
I 6,0 MHz ------ 6,552 MHz
M/N 4,5 MHz 4,72 MHz ------
L AM 6,5 MHz ------ 5,85 MHz
M1 (Giappone) 4,5 MHz ------ ------
Durante la misurazione del portante audio si misura innanzitutto la
distanza del segnale dal portante audio al portante video in dB, poi il
livello di portante audio assoluto in dBìV. Durante la misurazione,
l’altoparlante rimane in mute. Al termine della misurazione si può sentire
la modulazione dell’ultimo portante audio misurato.
Sommario dei comandi della misurazione della frequenza del portante audioTV
[2ndF] [SC] Passare al menu Portante audio
[1]...[2] Passare da TT1 a TT2, vedi la tabella
Effettuare la misurazione del livello del portante audio
tenendo premuto il tasto
[3] Passare alla ricezione Nicam
Esempio
Per misurare la distanza ed il livello del portante audio di TT1:
premere [2ndF] [SC],
premere ora [1] e tenere premuto il tasto.
Il display LC mostra per circa 1 secondo i seguenti valori:
distanza del portante audio – frequenza: 5,5 MHz
distanza del portante audio - video: -13 dB
dopo circa 1 secondo appare il livello del portante audio.
Display LC:
distanza del portante audio – frequenza: 5,5 MHz
livello del portante audio: 58,5 dBìV
lasciare andare il tasto [1].
Per misurare la distanza ed il livello del portante audio di TT2:
come sopra. Premere il tasto [2] durante la visualizzazione del portante
audio.
0
ë
LEV: -13.0dB
SC: 5,50MHz TV
LEV: 58,5dBuV
40


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