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2 . F E A T U R E S
2-1 CONTRAST ENHANCEMENT CIRCUIT
A contrast enhancement circuit, providing for the independent amplifica-
tion of overall video gain and black level(offset), allows image contrast
to be dramatically increased over a very wide range. T h i s feature makes
possible the visualization of structures undetectable visually or photo-
graphically.
2-2 AUTOMA TIC GAIN CONTROL CIRCUIT
This circuit detects the intensity of the incident light, automatically
adjusts the amp gain, and keeps a constant video signal level.
The correction range against the incident light is about 8:1.
(It corresponds to the i r i s at 3 levels.)
2-3 SIT PROTECTION CIRCUIT
W h e n using a SIT tube as for a camera head, this circuit protects the SIT
tube fro■ the excessive incident light.
W h e n the quantity of light, i s 1.3 times as much as the normal that, i s
input, t h i s circuit works.
2-4 TIMING CONTROL BY CRYST AL OSCILLATION
All control signals, as well as deflection frequency, are controlled by
crystal oscillation. T h i s results in very high precision in the scanning
and synchronization signals ensuring a consistently high quality image.
2-5 LEVEL INDICATOR
A video level indicator circuit accurately monitors input intensity to
the imaging tube by way of two LED's. T h i s feature allows for the rapid
determination of the ideal illumination level required to produce the
highest quality image.
2-6 TUBE PROTECTION CIRCUIT
A protection circuit has been provided to prevent burn-in of the imaging
tube should the horizontal or vertical synchronization signals be lost.
2-7 WHITE CLIPPER
This circuit clops the video signal when i t exceeds 1.2V thereby prevent-
ing the TV monitor fro■ losing synchronization.
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