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(3) INVERTER
In this position(lower), the output video signal i s inverted with regard
to input intensity as indicated below.
8-6 AUTOMA TIC GAIN CONTROL
A G C is a function to keep a constant output video signal against to the
varior of the input intensity.
(1) I n the condition of turning the AGC switch to OFF side, adjust the
intensity of light until the green LED lights.
(2) Turn the AGC switch to ON side. Automatically adjusts AMP GAIN, and
outputs a constant video signal.
The correction range against the incident light i s about 8:1.
(It corresponds to the i r i s at 3 levels.)
CAUTION)
',When there i s no or l i t t l e incident light, AMP GAIN becomes maximum.
Therefore, S/N becomes smaller.
°When the red LED on the front panel of CCU lights by the excessive
incoming light, stop down the i r i s .
Inversion
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