CV-A1-20
6.5. Edge Pre-select Mode
The exposure starts at the first HD pulse after the trigger leading edge. It stops and is read out
after the duration of the shutter time selected. It can be the first 9 step in normal or 1023 steps
in programmable shutter. SM=0 or SM=1. Shutter selections SH
≥
10 will result in 1/8381 sec. This
mode will operate with full and partial scanning and with all binning modes. Partial scanning
together with binning will work, but it is not described, and no timing diagrams are documented.
An EEN pulse will indicate the active accumulation time, and a WEN pulse indicates that the
resulting video is being read out.
To use this mode:
Set function:
Trigger mode “Edge Pre-select”
TR = 1
Shutter mode “Normal” or “Programmable”
SM=0, SM=1
“Shutter Speed”
SH=0 through 9
“Programmable exposure”
PE=1 through 1023
Polarity and other functions
Input:
Ext. trigger to pin 5 on 6 pin connector (or pin 11 on 12-pin connector).
Ext. HD to pin 6 on12-pin connector. (If used).
Important notes on using this mode.
•
The start of exposure will start synchronized to the internal H signal. The start may be
shifted max 1H. To avoid this shift (1 H jitter), synchronize the camera to an external HD
and make sure that the trigger pulse aligns to the HD as shown in fig. 17.
•
The duration of the trigger should be >1H to <2000H.
•
A new trigger must not be applied before WEN is high.
•
In trigger modes there are no continuous VD out, only after each trigger input.
1H = 83.6
µ
s
No equalize and serration pulses.
Table showing the figures for the different modes.
Scan mode
A
B
C
CCD array line #
D
Effective video
E
Max frame rate
fps
Remarks
Full
10H 14H 4 to 1038
1035H
18H
11
1/2 Partial
17H 33H 271 to 783
513H
25H
20
1/3 Partial
17H 33H 357 to 697
341H
25H
28
1/6 Partial
17H 33H 442 to 612
171H
25H
46
H binning
10H 14H 4 to 1038
1035H
18H
11
V binning
10H 14H 18
to
1019
501H
18H
22
V+H binning 10H 14H 18
to
1019
501H
18H
22
Fig. 20. Timing for Edge Pre-select with partial scanning and binning.
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