Figure C-5 Nightshot Operation With Acuix 18× And 26× Tdn Camera Blocks - Honeywell ACUIX User Manual

Understanding Automatic Exposure and NightShot
Operation of NightShot with ACUIX 35× Camera Blocks
104
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
Iris open
Max Gain
TDN mode change region
AE
AER 1
4.0 lx
AER 2
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].
Decreasing
Depth of Field
Increasing
Video Noise
Shutter = 1/60 s or 1/50 s
30 lx
400 lx
150 lx
Iris Closed
Iris
Min Gain
Gain
Min Shutter
Time
Decreasing
Shutter
Motion Blur
Increasing
Light Level