Förinställningar på monitorn

Om signalen som överförs från datorn är densamma som följande förinställningar, kommer skärmen att anpassas automatiskt. Men om signalen är annorlunda, kan skärmen bli tom medan lysdioden som visar eltillförseln fortfarande lyser. Läs i handboken till videokortet och justera bildskärmen enligt följande:

Tabell 1. Förinställningar på displayen

Display Mode	Horisontalfrekvens	Vertikalfrekvens	PixelClock (MHz)	polaritet
Display Mode	(kHz)	(Hz)	PixelClock (MHz)	(H/V)
	(kHz)	(Hz)		(H/V)

IBM, 640 x 350	31,469	70,086	25,175	+/-

IBM, 640 x 480	31,469	59,940	25,175	-/-

IBM, 720 x 400	31,469	70,087	28,322	-/+

MAC, 640 x 480	35,000	66,667	30,240	-/-

MAC, 832 x 624	49,726	74,551	57,284	-/-

MAC, 1152 x 870	68,681	75,062	100,00	-/-

VESA, 640 x 480	37,500	75,000	31,500	-/-

VESA, 640 x 480	37,861	72,809	31,500	-/-

VESA, 800 x 600	35,156	56,250	36,000	+,-/+,-

VESA, 800 x 600	37,879	60,317	40,000	+/+

VESA, 800 x 600	46,875	75,000	49,500	+/+

VESA, 800 x 600	48,077	72,188	50,000	+/+

VESA, 1024 x 768	48,363	60,004	65,000	-/-

VESA, 1024 x 768	56,476	70,069	75,000	-/-

VESA, 1024 x 768	60,023	75,029	78,750	+/+

VESA, 1152 x 864	67,500	75,000	108,00	+/+

VESA, 1280 x 1024	63,981	60,020	108,00	+/+

VESA, 1280 x 1024	79,976	75,025	135,00	+/+

Horisontalfrekvens

Den tid det tar att avläsa en linje som binder ihop högerkanten med vänsterkanten på bildskärmen vågrätt kallas horisontalcykel och horisontalcykelns omvända tal kallas horisontal frekvens. Måttenhet: kHz.

Vertikalfrekvens

I likhet med ett lysrör måste bildskärmen repetera samma bild många gånger i sekunden för att visa en bild för användaren. Frekvensen hos denna upprepning kallas vertikalfrekvens eller svepfrekvens (refresh rate). Måttenhet: Hz.

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