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 | 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 | |
| Ext. HD to pin 6 |
|
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 ∝s
No equalize and serration pulses.
Table showing the figures for the different modes.
| A | B | C | D | E | Max frame rate | Remarks |
Scan mode |
|
| CCD array line # | Effective video |
| fps |
|
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.
- 11 -