JAI CM-200GE User Manual

Also see for CB-200GE: User manual

Contents

JAI CM-200GE User Manual Manual pdf 38 page image

CM-200GE/CM-200GE-RA/CB-200GE/CB-200GE-RA- 36 -Exposure Time Abs (GenICam Standard)This is a function specified in the GenICam standard.The shutter speed can be entered as an absolute exposure time in microseconds (μs) in registeraddress 0xA018. The entered absolute time (Time Abs) is then converted to programmableexposure (PE) value inside the camera.The below calculating formula shows the relationship between the PE value used by the camerafor the different readout modes and the value entered in register 0xA018.As the calculation is based on rounding down to the closest integer, precise values may not alwaysoccur.The relation between PE value and Time Abs:Normal readout PE= 2 + INT (1) (Exposure time -64) μs / (2080(2)/65000000(3))V Binning readout PE= 2 + INT (Exposure time -71.692) μs / (2330/65000000)Note: (1) INT means integer (rounded down). (2) Pixel clocks/line. (3) Pixel clockThe following table shows minimum value and maximum value for each readout mode.Minimum value Maximum ValueNormal Scan 64 us 40,032 μs2/3 Partial Scan 64 us 28,512 μs1/2 Partial Scan 64 us 22,816 μs1/4 Partial Scan 64 us 14,386 μs1/8 Partial Scan 64 us 10,208 μsV-Binning Scan 71.692 us 22,476 μsGPIO in combination with Pulse Width triggerMore precise exposure time can be obtained by using GPIO in combination with Pulse Width triggermode. The clock generator and counter can be programmed in very fine increments.For examples of settings, refer to chapter 6.5.1.9.3. Auto-detect LVAL-sync / async. accumulationThis function replaces the manual setting found in older JAI cameras. Whether accumulation issynchronous or a-synchronous in relationship to LVAL depends on the timing of the trigger input.When trigger is received while FVAL is high (during readout), the camera works in LVAL-synchronous mode, preventing reset feed trough in the video signal. There is a maximum jitter ofone LVAL period from issuing a trigger and accumulation start.If trigger is received when FVAL is low, the cameras works in LVAL-asynchronous mode (no delay)mode. This applies to both pre-select (PS) trigger mode and pulse width trigger (PW) mode.Ext. triggerFVAL(1) (3)(1) In this period camera executes trigger at next LVAL (prevents feed-through noise)(2) Avoid trigger at FVAL transition (+/- 1 LVAL period), as the function may randomly switchbetween "next LVAL" and "immediate".(3) In this period camera executes trigger immediately (no delay)(2)Fig. 27. Auto-detect LVAL sync /async accumulation