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8-2 ADJUSTMENT OF VIDEO LEVEL
The light intensity directed to the camera faceplate i s critical. To o
l i t t l e light will result in a poor quality image. Excessive light intensity
will likewise degrade image quality and i f too high, can result in permanent
damage to the image tube.
N O T E : The -00,-03, and -08 camera heads are particularly susceptible to
damage from excessive light intensity * , * * .
(1) Minimize image intensity
(2) Direct light to the camera head
(3) Slowly increase the image intensity until the green video level indicator
comes on. T h i s point represents the minimum intensity needed to produce
a high quality image.
(4) Continue to carefully increase image intensity until the red LED just
begins to come on. This condition represents the optimal image intensity.
For -00,-03 Camera Heads
These imaging tubes employ a target with adjustable voltage. Increasing
the voltage to the target(SENSITIVITY) results in increased tube sensi-
tivity.
The highest quality image is obtained when the SENSITIVITY control i s
turned to i t s minimum position ( f u l l y CCW). Increased target voltage
results in a poorer S/N, reduced dynamic range and increased lag;
therefore, the SENSITIVITY control should be increased only when the
imaging system can not supply enough illumination or i t i s intentionally
desired to reduce object illumination. I n this case, increase the sensi-
tivity until the upper range of the green LED is reached.
For -08 Camera Head
TT
This imaging tube employs a intensifier with adjustable voltage.
Increasing this voltage increases the sensitivity accordingly. T h e best
quality image i s obtained when the SENSITIVITY control i s turned to i t s
minimum position. Increased voltage results in a poorer S/N, therefore,
the SENSITIVITY control should be increased only when the imaging system
cannot supply enough illumination or i t is intentionally desired to reduce
object illumination. I n this case, increase the sensitivity until the
upper range of the green LED i s reached.
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