Basic Operation and Features
Basler A500k Series 3-27
PRELIMINARY
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 AOI Height
Timer 1 [µs]
Programmable, Free-run
ExSync Low Time [µs]
Level-controlled
500 1024 1996 1994
1000 512 996 994
2000 256 496 494
4000 128 246 244
8000 64 121 119
16000 32 58 56
Table 3-2: Recommended Max Exposure Time at Max Speed
Timer 1
1
frame rate
---------------------------Timer 2– 1µs–=
Timer 1
1
500
----------3µs– 1µs–=
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