SP-20000M-PMCL / SP-20000C-PMCL
- 44 -
7.2.2 ExposureTime
This command is effective only when Exposure Mode is set to Timed. It is for setting exposure
time. The setting step for exposure time is 1
μ
sec per step.
Minimum:
10
μsec
(Note: The real exposure rtime is 304µs)
Maximum:
8 seconds
(
When Frame Start Trigger Mode is ON
)
Note: The real exposure time is shown in the following table due to the sensor characteristics.
But the exposure active signal is same as the exposure time.
TapGeometry CmaeraLink
Clock
Sensor real exposure time
1X8-1Y
1X4-1Y
80MHz
Exposure Time + 294us
1X8-1Y
1X4-1Y
60MHz
Exposure Time + 395us
1X2-1Y
80MHz
Exposure Time + 589us
1X2-1Y
60MHz
Exposure Time + 791us
7.2.3 Behavior if Trigger Overlap is set to Readout
In the SP-20000-PMCL, 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.
Table - 25
Modes where the exposure control becomes 1L if overlap occurs
As an example, the following is for Continuous Trigger.
JAI Custom Naming
Trigger Mode
Trigger Overlap
Continuous Trigger
Off
(don't care)
EPS Trigger / LVAL SYNC Reset
On
Readout
HDR
Off / On
(don't care)
Note:
In Continuous Trigger operation with Frame Start Trigger Mode OFF, the maximum Exposure Time
is limited by the frame rate setting. In 1X8–1Y camera output format and 80 MHz Camera Link
pixel clock, the maximum setting value is 7.999742 sec which is 258
µ
s smaller than 8 seconds,
the maximum value of frame rate setting.
In EPS Trigger operation (Frame Start Trigger Mode set to On), the maximum exposure time is not
influenced and therefore it is 8 seconds as the maximum.
Due to the characteristics of the camera’s sensor, the black level may rise if a long time
exposure is used, or if the sensor temperature increases. Although this black level variance
is compensated in the camera, the performance needed to maintain the dynamic range for a
maximum exposure of 8 seconds is guaranteed only under the following conditions.
SP-20000M-PMCL : The ambient temperature is up to 25
℃
.
SP-20000C-PMCL : The ambient temperature is up to 15
℃
.