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Sensitivity Control
38
Sensitivity Control
The VSUB (substrate bias voltage) in the CCD can be
changed. VSUB adjustment allows you to change the Qs
(saturation signal charge) value. Increasing the VSUB
has the effect of improving the sensitivity*
1
. Therefore,
when capturing a dark image but the exposure time
cannot be extended, this has the effect of improving the
image quality. On the other hand, decreasing the VSUB
has the effect of reducing image smearing. The factory
setting is adjusted to the optimal value.
*
1
If Qs exceeds the maximum signal charge amount
that can be transferred vertically and horizontally, a
transfer error will occur, resulting in image smearing,
etc.
User Set
Main set values can be saved to the channels 1 to 16 of
USERSET. Refer to “Command List” (page 41) for
items to be saved. The factory setting is saved to channel
0, which cannot be overwritten.
Setting example (1):
Shutter 3 ms, Gain 3 dB, FVAL signal is output to
GPO3 connector (This setting is saved to the channel
1.)
>EXPOSURE 3000
>GAIN 3
>GPO 9 3
>USERSET-SAVE 1
Setting example (2):
The user set saved in the channel 2 is loaded.
>USERSET-LOAD 2
User set name
Strings that are 31 characters long can be assigned to
channels 0 to 16. For example, you can assign names
such as “setting1” and “setting2” in accordance with the
settings.
User set memory
This is one of the items to be saved in the user set
channel. Signed 32-bit numbers are assigned to slots 0 to
15.
Configuration diagram of user set
Free Memory
Signed 32-bit numbers can be saved and loaded to 8192
areas.
User ID
User IDs are unique names that can be assigned to
cameras. A string that is 15 characters long can be
assigned.
command
param
Setting
VSUB-
EXTERNAL-
MODE
0
Sensitivity adjustment off
1
Sensitivity adjustment on
command
param
Setting
VSUB-EXTERNAL
0 to 127
Sensitivity adjustment
value
command
param
USERSET-NAME
31 characters of your choice
command
param1
param2
FREE-MEMORY
0 to 8191
-2
31
to 2
31
- 1
command
param
USER-ID
15 characters of your choice
Factory setting