Edge Pre-Select Mode - JAI CV-A2 Operation Manual

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:
Input:
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.
A
Scan mode
Full 3H 20H
1/2 Partial 21H 36H
1/3 Partial 21H 36H
1/6 Partial 21H 36H
V binning 3H 20H
Fig. 19. Timing for Edge Pre-select with partial scanning and binning.
Trigger mode "Edge Pre-select"
Shutter mode "Normal" or "Programmable"
"Shutter Speed"
"Programmable exposure"
Polarity and other functions
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).
B C
CCD array line #
8 to 1227
314 to 923
415 to 822
517 to 720
26+27 to 1212+1213
CV-A2
D E
Effective video
1220H 18H
610H 29H
408H 29H
204H 29H
594H 18H
- 13 -
TR = 1
SM=0, SM=1
SH=0 through 10
PE=1 through 2047
Max frame rate Remarks
fps
15
28
40
70
30