CV-A2
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 10 steps in normal or 2047
steps in programmable shutter. SM=0 or SM=1. Shutter selections SH
≥
10 will result in 1/12,000
sec. This mode will operate with full and partial scanning and with V binning modes. If partial
scanning and binning is selected at the same time, partial scanning will have priority.
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 10
“Programmable exposure”
PE=1 through 2047
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 on 12 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. 18.
•
The duration of the trigger should be >1H.
•
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.
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
3H
20H
8 to 1227
1220H
18H
15
1/2 Partial
21H
36H
314 to 923
610H
29H
28
1/3 Partial
21H
36H
415 to 822
408H
29H
40
1/6 Partial
21H
36H
517 to 720
204H
29H
70
V binning
3H
20H
26+27 to 1212+1213
594H
18H
30
Fig. 19. Timing for Edge Pre-select with partial scanning and binning.
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