Mitsubishi Electric Diamond Pro 930SB, Service Manual

Page: 73 / 187

5-7
3. Electric Specifications
3.1 Deflection Circuit
Scanning Frequency 30 – 110 kHz
Back Porch
≥
1.1
µ
sec
Blanking
≥
2.3
µ
sec
Horizontal
H-sync Width
≥
0.8
µ
sec
Scanning frequency 50 – 160 Hz
V-sync + V-back Porch
≥
420
µ
sec
V-sync Width 2H
≤
Vs
≤
8H or 100
µ
sec
Vertical
V-Total Line
≥
256H+ V-sync Width
3.2 Signal Input
Video Input Signal R.G.B analog
Sync. Input Signal
External composite sync. TTL (P or N)
External HD/VD separate sync. TTL (P or N)
Video Input Impedance 75 ohm to ground
Sync. Input Impedance 2.2k ohm to grand or more.
Signal Level
Video signal : 0.70V p-p
±
5%
Composite sync. :TTL level (>2.5V)
Separate H/V-sync. :TTL level (>2.5V)
3.3 Video Performance
Video Clock Frequency 290MHz (Input signal)
Pulse Rise and Fall time 6.0nsec (typ.) 10 to 90% at 30Vp-p
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 :
) (
2 2 2 2
Tsc Tp Ts Tm Ta
+ + − =
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)