Instruction manual

Marlin Technical ManualV.2.7.0
144
Controlling image capture
Exposure time (shutter) and offset
• The exposure (shutter) time for continuous mode and Trigger_Mode_0 is
based on the following formula:
Shutter register value x timebase + offset
• The exposure (shutter) time for Trigger_Mode_1 is based on the following
formula:
Length of active pulse + offset
The register value is the value set in the corresponding IIDC register (SHUTTER
[81Ch]). This number is in the range between 1 and 4095.
The shutter register value is multiplied by the time base register value (see Table
102: Timebase ID on page 202). The default value here is set to 20 μs.
A camera-specific offset is also added to this value. It is different for the camera
models:
Note

• Switching trigger delay to ON also switches external Trig-
ger_Mode_0 to ON.
• This feature works with external Trigger_Mode_0 only.
Note

• Trigger_Mode_1: Do not make the pulse shorter than 20
μs, because this will not shorten the exposure time any
further.
• Trigger_Mode_1: If you start exposure while the sensor is
being read out, there will be an additional jitter for the
exposure time (the jitter values are the same as in Table
73: Jitter at exposure start (no binning, no sub-sam-
pling) on page 151).