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- 16 -
6.2.9. Partial scanning vertical timing
Partial scanning has 3 pre-selected vertical centred areas 1/2, 1/4 and 1/8. SC=1 through SC=3.
With SC=3, the start and the height of the partial scanned area can be programmed with 1 line
interval. The start line can be programmed with PS=1 through 1151. The scanned height can be
programmed with PC=50 though 1200. Partial scanning will operate with single or dual channel
output. Partial scan is done by a high-speed dump read out of the areas over and under the area
of interest. This partial scanned area is read out with normal speed. The high-speed dump read
out (Front of Frame and in Back of Frame) is done with a speed 18 times faster for single
channel, and 10 times faster for dual channel.
The figures on the timing diagram below are for 1/2 partial scanning.
L VAL
DVAL
SUB
SG
FVAL
668L( *)
670L( *)
EEN
1 FVAL per i od
Hi gh Speed
Tr ansf er
DA TA OUT
OB
Ef f ect i ve Li nes
2L
45
5
9
7
5
9
6
5
9
8
6
0
0
5
9
9
600L( *)
OB
4L
2L
Bl ank
31L( *)
31L( *)
123
0. 5L
Exposur e
Pe r i od
( *) Var i abl e Number
2L
Fr ont of Fr ame Back of Frame
All figures marked with (*) will change with other partial settings. See table below. 1LVAL = 47.9 µsec (single). 27.3 µsec (dual).
Fig. 23. Partial scanning vertical timing
The following table shows the figures for partial scanning.
The maximum frame rate (FPS) for single and dual channel readout is shown for normal mode.
TR=0. For triggered modes it will be lower, because the accumulation time is added to the read
out time. 1LVAL = 47.9 µsec (single). 27.3 µsec (dual).
Table showing values for the vertical timing.
Single channel output Frame Start Frame End
Mode
Scanning
Start
line
Stop
line
OB
[LVAL]
HS
[LVAL]
Effect.
video
[LVAL]
HS
[LVAL]
OB
[LVAL]
Frame
rate
[FPS]
Remarks
SC=0 Full 1 1200 6 0 1200 0 10 17.17
Full scan
SC=1 1/2 partial 301 900 2 17 600 17 6 32.52
Vertical centred
SC=2 1/4 partial 451 750 2 26 300 26 6 57.99
Vertical centred
SC=3 1/8 partial 526 675 2 30 150 30 6 95.77
Vertical centred
SC=4 Programmable
1-1151 50-1200
2 -
50-1200
- 6 -
Start & height program.
Dual channel output Frame Start Frame End
Mode
Scanning
Start
line
Stop
line
OB
[LVAL]
HS
[LVAL]
Effect.
video
[LVAL]
HS
[LVAL]
OB
[LVAL]
Frame
rate
[FPS]
Remarks
SC=0 Full 1 1200 6 0 1200 0 10 30.12
Full scan
SC=1 1/2 partial 301 900 2 31 600 31 6 54.67
Vertical centred
SC=2 1/4 partial 451 750 2 46 300 46 6 91.58
Vertical centred
SC=3 1/8 partial 526 675 2 53 150 53 6 138.75
Vertical centred
SC=4 Programmable
1-1151 50-1200
2 -
50-1200
- 6 -
Start & height program.
OB = Optical Black. HS = High-Speed dump read out.