Adjustment of Video Level
* * For -08 Camera Head
This imaging tube employs a intensifier with adjustable voltage.
Increasing this voltage increases the sensitivity accordingly. The best
quality image is obtained when the SENSITIVITY control is turned
to its 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 it is in-
tentionally desired to reduce object illumination. In this case, increase
the sensitivity until the upper range of the green LED is reached.
W
h
e
n
observing a specimen with low contrast, image contrast can be
8.3 A d j u s t m e n t o f
increased through the proper use of the GAIN and OFFSET controls.
Contrast
Enhancement
8.4 Adjustment o f
Shading
Corrector
(OPTION)
(3)
(1) While watching the monitor screen, turn the GAIN control knob
clockwise until the intensity appears slightly more than suitable.
(2) Slowly turn the OFFSET control knob counterclockwise until the
image is displayed as desired.
Repeat adjustments of both (1) and (2) until the desired part of
the image is displayed most clearly.
Offset Level
_Lf..... j .
Before enhancement
• • • • • • • • • • 0 T h .
After enhancement
When the M2502 SHADING CORRECTOR is installed in the CCU,
shading introduced by the camera and the optical system can be cor-
rected. This feature allows for the most effective utilization of the contrast
enhancement function.
Adjustment is as follows:
(1) A d j u s t
CONTRAST ENHANCEMENT
to achieve maximum image
detail.
(2) S e t the
SHADING
switch to the
ON
position.
(3)
Correct the shading by adjusting the 4 potentiometers on the
front
panel
of the CCU with a small slotted screwdriver.
The functions of the potentiometers are as follows:
1.
H o r i z o n t a l Parabola n
Adjusting horizontal parabola decreases the difference in the in-
tensity between the center and the corners in the horizontal di-
rection.
Turning the adjusting
screw clockwise results in the hori-
zontal center becoming brighter. Turning the adjusting screw
counterclockwise results in the corners becoming brighter.
2. H o r i z o n t a l Sawtooth
Adjusting horizontal sawtooth decreases the difference in the in-
tensity between the right and left sides of the image. Turning the
adjusting screw clockwise results in the left side of the image be-
coming brighter. Turning the adjusting screw counterclockwise
results in the right side of the image becoming brighter.
3. Ve r t i c a l Parabola
Adjusting vertical parabola decreases the difference in intensity
between the center and the corners in the vertical direction. Turning
the adjusting screw clockwise results i n the center becoming
