Digitalni osciloskop

[Soltisik Miroslav]

 > Doufam ze to chapu spravne... Sirka pasma osciloskopu
> (vstupu) je dana jako pokles  merene urovne. Potom tedy i vyssi 
> frekvence projdou, jen zatlumene. S nizkou vzorkovaci frekvenci nejsou 
> (korektne) zobrazene. To muze byt další duvod pro rychlejsi 
> vzorkovani.¨ Petr


Hlavny dovod je v inom.
Antialias filter musi mat (ako bolo uz pisane) dost strmy pokles amplitudovej charakteristiky.
Tym sa vsak dost na figu zmeni fazova chrakteristika.
Tym padom sa rozne frekvencie rozne posunu.
A teda vysledok bude len taky odhad povodneho signalu.
T.j. ak vam staci sinusovka (naco potom osc?) potom je pravidlo sirka osc > 3 * najvyssia harmonicka signalu ok.
Pre seriozne merania (osc. je meraci pristroj) je minimum sirka osc > 5 * najvyssia harmonicka signalu.
Cim viac, tym presnejsie merania, ale prudko to ide do penazi :-)
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