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7.2.3
Behavior if Trigger Overlap is set to Readout
In the SP-20000-USB, if the accumulation of the next frame starts while the current image is read out,
the varied value of accumulation time is changed to 1 Line period inside the camera. This is done so that
the accumulation start signal will not affect the output signal while it is overlapped.
However, the shutter noise at the exposure start period will appear on images. It is approximately
70LSB/10-bit as the maximum.
Table – 23 Modes where the exposure control becomes 1L if overlap occurs
JAI Custom Naming
Continuous Trigger
EPS Trigger / LVAL SYNC Reset
HDR
Table – 24
Camera Settings
Binning Vertical
1 (Off)
2 (On)
Note: The sensor used in the SP-20000-USB does not have a function of Shutter OFF.
If [Frame Start]-[Trigger Mode] is OFF or [Exposure Mode] is OFF, the camera operates
at the maximum exposure time based on the above formula.
7.2.3
ExposureAuto
This is a function to control the exposure automatically. It is effective only for Timed.
ALC Reference controls the brightness.
There are three modes: OFF, Once and Continuous.
OFF:
Once:
Continuous:
In this mode, the following settings are available.
ALC Speed:
ASC Max:
ASC Min:
ALC Reference:
ALC Channel area:
SP-20000M-USB / SP-20000C-USB
Trigger Mode
Off
On
Off / On
Formula of the exposure time maximum value at the continuous trigger
Continuous Trigger
[Exposure Time Max] setting calculation formula
[Unit：us]
[Acquisition Frame Rate Raw ] - 250us
[Acquisition Frame Rate Raw ] - 250us
No exposure control
Exposure adjusts when the function is set, then remains at that setting
Exposure continues to be adjusted automatically
Rate of adjustment can be set (common with Gain Auto)
The maximum value for the exposure time to be controlled can
be set
The minimum value for the exposure time to be controlled can
be set
The reference level of the exposure control can be set (common
with Gain Auto)
The measurement area of the exposure control can be set
Trigger Overlap
(don't care)
Readout
Readout, if the trigger mode
is ON.
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