Max Exposure Time At Max Speed (A504K/Kc Only) - Basler A500k User Manual

3.5 Max Exposure Time at Max Speed (A504k/kc
Only)
In many applications, cameras are operated at maximum speed and at maximum exposure time.
To obtain a reliable timing for frame read-out in Synchronous Timing 2, follow the setup
recommendations described in this section. This recommendation applies to level-controlled,
programmable, free-run VGA and free-run, programmable exposure time control modes. It is
irrelevant for edge-controlled mode.
In free-run mode, the frame rate is equal to 1 divided by (Timer 1 plus Timer 2). In other modes,
the frame rate is equal to 1 divided by (ExSync high time plus ExSync low time).
For maximum exposure, Timer 2 must always be set to 3 µs in free-run and programmable mode.
In level-controlled mode, the ExSync high time must always be set to 5 µs.
With these values, the exposure time can be calculated. To achieve a reliable Synchronous
Timing 2 at full frame rate, however, we recommend that you use the calculated exposure time
minus 1µs.
Example for free-run mode
The aim is to achieve a maximum frame rate of 500 fps at full AOI.
To achieve a maximum frame rate of 500 fps at full AOI, Timer 1 must be set to 1996 µs.
Table 3-2 shows the maximum recommended Timer 1 and ExSync low time values for different
maximum frame rates at different AOI Height values. Timer 2 is assumed to be 3 µs, the ExSync
high time 5 µs.
Max. Frames Per Second
500
1000
2000
4000
8000
16000
Table 3-2: Recommended Max Exposure Time at Max Speed
k
Basler A500
PRELIMINARY
1
Timer 1 = -------------------------- - Timer 2 –
frame rate
1
Timer 1 = --------- - 3µs –
500
AOI Height
Programmable, Free-run
1024 1996
512 996
256 496
128 246
64 121
32 58
Basic Operation and Features
– 1µs
– 1µs
Timer 1 [µs] ExSync Low Time [µs]
Level-controlled
1994
994
494
244
119
56
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