Manual Kathrein MFK 11 - CATV-Analyzer (page 37 of 40) (German)

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ANHANG A

Messung des Bildträgerpegels (C

) – ANALOGE KANÄLE –

A) Negative Bildmodulation (PAL / NTSC)

Als Messwert wird die Modulationsspitze des Bildträgerpegels angezeigt,

d. h. der maximale Signalwert der Zeilensynchronimpulses. Das MFK 11

benötigt kurze Zeit um diese Messung durchzuführen, da die Spitze des

modulierten Signals gefunden werden muss.

Messung des Bildträgerpegels

Die typischen Schwankungen des Bildträgerpegels liegen im folgenden

Bereich:

bei der Übertragung von 70 bis 100 dBµV (10 bis 40 dBmV)

beim Endkunden von 60 bis 80 dBµV (0 bis 20 dBmV)

B) Positive Bildmodulation (SECAM)

Bei dieser Modulationsart wird die Zeilensynchronisation durch einen

Mindestträgerpegel definiert. Der maximale Signalpegel (Messpunkt) ist

zeitlich variabel, und hängt vom übertragenen Bild ab. Er kann zwischen

weißem und schwarzem Bild bis zu 10 dB schwanken, allerdings werden

Weißsignale (Video Insertion Test, VIT) in der Austastlücke übertragen,

was den Schwankungsbereich auf etwa 4 dB reduziert.

Aus diesem Grunde, und wegen der kurzen Dauer des VIT-Impulses,

empfehlen wir bei Pegelmessungen an SECAM-Signalen 2 dB zu dem

angezeigten Messwert zu addieren, um bei dieser Annäherungsmessung

ein genaueres Ergebnis zu erzielen.

Messpunkt

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Kathrein MFK 11 - CATV-Analyzer Manual

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