Compaq P1220 Wartungshandbuch PDF herunterladen (Seite 125)

VSP-C0459

Video signal : 0.7V p-p +10% -5%

3.2 Signal Input

3.3 Video Performance

•The rise and fall time of the input video signal is 2.0nsec or less.

•The pulse rise or fall time is determined using the formula :

Ta = Tm

- (Ts

+ Tp

+ Tsc

)

Where : Ta = Amplifier rise / fall time

Tm = Measured rise / fall time

Ts = Input signal rise / fall time

Tp = Probe effect on rise / fall time = 2.2 x Rl x Cp

Rl = Amplifier output resistance (ohm)

Cp = Total probe capacitance (F)

Tsc = Scope rise / fall time = 0.35 / Scope

bandwidth (MHz)

Video Input Signal R.G.B analog

Sync. Input Signal

External composite sync. , Negative TTL

External HD/VD separate sync. TTL (N or P)

Video Input Impedance 75Ω to ground

Sync. Input Impedance 2.2kΩ to ground

Signal Level

Separate H/V-sync. : TTL level ( >2.5V)

Video Clock Frequency 240MHz

Pulse Rise and Fall time

3.Electric Specifications

3.1 Deflections

Horizontal

Scanning Frequency

Back Porch

Blanking

30 - 121kHz

≥1.0 µsec

≥ 2.0 µsec

Vertical

Scanning frequency

V-sync Width

50 - 160Hz

V-sync + V-back Porch

≥ 400 µsec

H-sync Width

≥ 0.6 µsec

V-Total Line

≥ 256H + V-sync Width

2H ≤ Vs ≤ 10H---up to 50kHz (fh)

(*) Full screen adjustment may not be available for the timing which

Tdh / Th < 72% - Over 100kHz (fh)

Tdh / Th < 74% - Up to 100kHz (fh)

Tdh : Horizontal Display Time

Th : Horizontal Scanning Time

3H ≤ Vs ≤ 10H---over 50kHz (fh)

4.0nsec(typ.) 10 to 90% at 35Vp-p

Composite sync with Green video (Sync on Green)

Sync on Green : 0.3V p-p ± 10%

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