Basic Operation and FeaturesBasler A500k Series 3-27PRELIMINARY3.5 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 setuprecommendations described in this section. This recommendation applies to level-controlled,programmable, free-run VGA and free-run, programmable exposure time control modes. It isirrelevant 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 Timing2 at full frame rate, however, we recommend that you use the calculated exposure time minus1μs.Example for free-run modeThe 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 differentmaximum frame rates at different AOI Height values. Timer 2 is assumed to be 3 μs, the ExSynchigh time 5 μs.Max. Frames Per Second AOI Height Timer 1 [μs]Programmable, Free-runExSync Low Time [μs]Level-controlled500 1024 1996 19941000 512 996 9942000 256 496 4944000 128 246 2448000 64 121 11916000 32 58 56Table 3-2: Recommended Max Exposure Time at Max SpeedTimer 1 1frame rate--------------------------- Timer 2– 1μs–=Timer 1 1500---------- 3μs– 1μs–=
