Honeywell ACUIX - Figure C-5 Nightshot Operation with ACUIX 18× and 26× TDN Camera Blocks

104
Understanding Automatic Exposure and NightShot
If color information needs to be retained at lower light levels even with an
increase in video noise, these settings can be moved to lower light levels (higher
gain and longer shutter times).
Figure C-5 shows the approximate light level ranges for the points where the
video gain and shutter times are changing due to light level changes in both the
day mode (IR cut filter in) and in the night mode (IR cut filter out). The differences
in the light levels between the day and night modes are due to the increased
video sensor sensitivity to IR light in the night mode.
The exposure mode is toggled between auto and manual using preset 92 if the
ACUIX is configured for MAXPRO-mode, Diamond protocol, VCL protocol, VCL
UTC protocol, Pelco P protocol, or Pelco D protocol. If the camera is in manual
exposure control mode preset 94 toggles between day and night NightShot
(TDN) modes.
Figure C-5 NightShot Operation with ACUIX 18× and 26× TDN Camera Blocks
Operation of NightShot with ACUIX 35× Camera Blocks
The ACUIX firmware does not directly control the NightShot (TDN) function of the
35× camera. You can configure the seven automatic exposure modes (see
Table C-2 and Figure C-6) using the OSD menus [from the OSD, select 5
Camera Options > 2 Exposure Control].
Iris open
Iris Closed
Min Ga in
Max Gain
Shutt er = 1/60 s or 1/50 s
Increasing
Light Level
Min Sh utter
Time
Decreasing
Depth of Field
Increasing
Video Noise
TDN mode change region
Decreasing
Motion Blur
Shutter
Gain
Iris
AE
AER 1
AER 2
30 lx
400 lx
4.0 lx
150 lx