2.6.3.5
Automatic Circuits
The camera shall have circuitry for through the lens (TTL) white balancing,
fixed white balancing, and automatic gain control.
2.6.4
Dome Cameras
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The designer should use caution in applying the
auto-iris function in low light applications,
because of the inability of most dome cameras to
efficiently reach an auto-iris setting for the low
light level conditions. This can result in premature
auto-iris motor failure.
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2.6.4.1
Interior Dome Camera System
An interior dome camera system shall be provided with integral camera
installed and integrated into the dome housing. The camera shall meet the
requirements of Paragraph: High Resolution Monochrome Camera or Paragraph:
High Resolution Color Camera as shown or specified. The
dome housing
shall be nominally 160 mm (6 inches) 6 inches and shall be furnished in a
pendant mount or ceiling mount as shown. The lower dome shall be tinted
acrylic and shall have a light attenuation factor of not more that 1
f-stop. The housing shall be equipped with integral pan/tilt complete with
wiring, wiring harnesses, connectors, receiver/driver, pan/tilt control
system, pre-position cards, or any other hardware and equipment as needed
to provide a fully functional pan/tilt dome. The pan/tilt shall have heavy
duty bearings and hardened steel gears. The pan/tilt shall be permanently
lubricated. The motors shall be thermally or impedance protected against
overload damage. Pan movement shall be 360 degrees and tilt movement shall
not be less than plus and minus 90 degrees. Pan speed shall not be less
than 20 degrees per second, and tilt speed shall not be less than 10
degrees per second. There shall not be less than 64 preset positions, with
positioning speeds of at least 360 degrees per second in the automatic
mode, and not less than 120 degrees pre second in the manual positioning
mode, with a positioning accuracy of plus or minus 1/2 degree. Each set of
preset position data shall include auto focus, auto iris, pan, tilt, and
zoom functions. The system shall be able to automatically scan between any
two electronically-set limits, and shall be able to operate in the "tour"
mode covering up to all presets in a user defined sequence. The dome system
shall withstand temperature ranges from minus 10 to 50 degrees C minus 22
to 122 degrees F over a humidity range of 0 to 90 percent, non-condensing.
2.6.4.2
Exterior Dome Camera System
An exterior dome camera system shall be provided with integral camera
installed and integrated into the dome housing. The camera shall have a
minimum horizontal resolution of 425 lines (color) or 500 lines
(monochrome). The dome housing shall be nominally 160 mm (6 inches) 6 inches
and shall be furnished in a NEMA 4 pendant mount, pole mount, ceiling
mount, surface mount, or corner mount as shown. The housing shall be
constructed to be dust and water tight, and fully operational in 100
percent condensing humidity. The housing shall be equipped with
supplementary camera mounting blocks or supports as needed to position the
specified camera and lens to maintain the proper optical centerline. All
electrical and signal connections required for operation of the camera and
lens shall be supplied. The housing shall protect the internal drives,
SECTION 16751A
Page 25
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