Resolution shall be maintained over the specified input voltage
and frequency range.
d.
Camera sensitivity and dynamic range
**************************************************************************
NOTE: International Electrical and Electronics
Engineers (IEEE) was formed by the merger of the
Institute of Radio Engineers (IRE) and the American
Institute of Electrical Engineers (AIEE). Although
IEEE has the most current unit of measure
abbreviations, the CCTV industry continues to use
IRE units as the standard measurement.
**************************************************************************
(1) Faceplate illumination shall be referenced to color
temperature of 2854 K.
(2) Nominal 0.538 lux 0.05 footcandle highlight illumination on
the faceplate shall produce 100 IRE units of picture video output.
The rms noise at the output with 0.538 lux 0.05 footcandle shall
be equal to or less than 0.011 volt with a signal-to-noise ratio
of 36 dB or greater.
(3) Nominal 0.0538 lux 0.005 footcandle highlight illumination on
the faceplate shall produce 100 IRE units of picture video output
from a 10:1 (20 dB) video gain increase from automatic gain
control (AGC) action. The rms flat noise with 0.0538 lux 0.005
footcandle shall be equal to or less than 0.011 rms volt with
signal-to-noise ratio of 16 dB or greater and resolution shall be
greater than 200 lines at center of picture.
(4) Automatic line control (ALC) and AGC shall maintain highlight
video output at 100 plus or minus 10 IRE units when focused on a
fixed average picture level (APL) test chart of 20 percent white,
80 percent black, and highlight ranges between 107,600 lux 10,000
footcandles and a minimum that gives 0.0538 lux 0.005 footcandle
on the faceplate.
(5) ALC and AGC shall maintain highlight video output at 100 plus
or minus 10 IRE units with APL between 0.2 and 0.8 in a constant
highlight level greater than 0.0538 lux 0.005 footcandle on the
faceplate.
(6) ALC response of fixed focus lenses shall stabilize the video
level within 5 seconds after a change in light between maximum and
minimum.
(7) Video black level shall be maintained at a setup level of 7.5
plus or minus units, with black area equal to 10 percent or
greater in the scene.
(8) Blanking level shall be a fixed reference at or near zero
volts.
(9) White peaks: Bright going video white output peaks shall
reach a level of at least 120 IRE units before clipping.
(10)
Black peaks:
Dark going video output peaks shall be clipped
SECTION 13703N
Page 48
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