Basic Operation and Features3-26 Basler A500kPRELIMINARY3.3.4.2 Free-run Mode with Synchronous/Asynchronous TimingFigure 3-21: Free-run, Programmable Mode - Exposure Start with Frame Valid High, ExposureStop with Frame Valid LowThe effective exposure starts while the Frame Valid signal is high and stops while the Frame Validsignal is low. The Integrate Enabled signal is set to high while the effective exposure occurs. Thestart, stop, and duration of the effective exposure are defined in the following ways (see Figure 3-21):• The effective exposure starts d microseconds after the fall of the internal control signal (expo-sure start delay).• Disregarding possible jitter, the duration of the effective exposure is defined by period p (setby Timer 1).• Jitter may shorten (f) or extend (g) the effective exposure, i.e.duration of the effective exposure = (p - f ) to (p + g).A504k/kc A503k A501k/kcp Exposure as set by Timer 1d 1 μs ... 3 μs 1.25 μs ... 3.75 μs 7.2 μs ... 20.2 μsf < 1 μs ≤ 1.25 μs < 0.8 μsg < 1 μs ≤ 1.25 μs < 0.2 μsInternalControlSignal p = Timer 1Internal Control Signal PeriodTimer 2FrameValidLineValid3.3 μs (A504k/kc)3.8 μs (A503k)20.6 μs (A501k/kc)d = 1 μs ... 3 μs (A504k/kc)d = 1.25 μs ... 3.75 μs (A503k)d = 7.2 μs ... 20.2 μs (A501k/kc)IntegrateEnabled f = ≤ 1 μs (A504k/kc)f = ≤ 1.25 μs (A503k)f = ≤ 0.8 μs (A501k/kc)p = Timer 1TIMING CHARTS ARE NOT DRAWN TO SCALEg = ≤ 1 μs (A504k/kc)g = ≤ 1.25 μs (A503k)g = ≤ 0.2 μs (A501k/kc)
