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C3438M (5/07) 9
SW1-7: DSS (Digital Slow Shutter)
The default shutter speed for NTSC is 30 frames per second (fps). It is 25 fps for PAL. This is also
known as SENS 2X.
You can decrease the shutter speed to 7.5 fps (NTSC) or 6.25 fps (PAL). This is known as SENS 8X,
which improves low light sensitivity.
Set to ON to select SENS 2X. Set to OFF to select SENS 8X. The default is ON.
SW1-8: Day/Night Operation (DW models only)
NOTE: On CW models, SW1-8 is unused and does not affect camera operation.
DW model cameras regularly check the brightness level of the field of view to determine when to
switch between day (color) and night (black-white) operation. Use SW1-8 to set the general light
levels at which the camera will automatically switch.
Set to ON (dark) to use standard thresholds to switch between color and black-white operation. This
is the default.
Set to OFF (dusk) to use higher light thresholds to switch between color and black-white operation.
Actual brightness threshold levels are affected by camera angle, amount of zoom, field of view, lens,
and type of lighting. The switching process lasts from seven to 10 seconds.
Figure 6 and Table B show how the camera switches between color and black-white operation for
each setting.
Figure 6. Threshold Switching Levels
NOTE: These switching thresholds are approximate and were measured using a 3.0 mm to 9.5 mm
lens at F1.0. Actual thresholds are affected by lens type and setting, field of view, scene, and other
factors. Use the thresholds in Table B as a guide when installing the unit.
Table B. Approximate Switching Thresholds
Dark (ON) Dusk (OFF)
Color to B-W 1.0 lux 4.0 lux
B-W to Color 3.0 lux 7.0 lux
B-W
MODE
COLOR
MODE
FALLING LIGHT LEVEL
RISING LIGHT LEVEL
B-W
MODE
COLOR
MODE
DUSK
4.0 lux
7.0 lux
B-W
MODE
COLOR
MODE
FALLING LIGHT LEVEL
RISING LIGHT LEVEL
B-W
MODE
COLOR
MODE
DARK
1.0 lux
3.0 lux