A D J U S T M E N T Of Video Level 1 - Hamamatsu Photonics c2400 Instruction Manual

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8.1 P r e l i m i n a r y
A d j u s t m e n t s
8.2 Adjustment
Video Level
8. OPERATION
) Confirm that all cables are properly connected. (Refer to Section
6 for cable connection.)
( 2 ) Preset each control on the front panel as specified below:
(a) Turn the GAIN control knob fully counterclockwise.
(b) Turn the OFFSET control knob fully clockwise.
(c) Turn the SENSITIVITY control knob fully counterclockwise.
(d) Set the VIDEO SELECT switch to the neutral (middle) position.
(e) Set the SHADING switch to the OFF position.
Turn on the TV monitor and confirm that the POWER pilot lamp
(3)
is lit. Adjust the CONTRAST control and BRIGHTNESS control to
a position in which the raster lines can be clearly observed. It will
take aproximately 20 to 30 seconds for raster to appear on the screen
after power is turned on.
(4) Ensure that the light path to the camera head is blocked.
Turn on the CCU power switch and confirm that the green POWER
(5)
LED is lit on the front panel. If the display picture rolls, adjust the
H. HOLD control and/or the V. HOLD control of the TV monitor.
The light intensity directed to the camera faceplate is critical. Too little
Of l i g h t will result in a poor quality image. Excessive light intensity will
likewise degrade image quality and if too high, can result in permanent
damage to the image tube.
NOTE:
The -00, -03 and -08 camera heads are particularly susceptible
to damage from excessive light intensity ' , " .
(1) Minimize image intensity
(2) D i r e c t light to the camera head
(3) Slowly increase the image intensity until the green video level in-
dicator comes on. This 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.
* F o r -00, -03 Camera Heads
These imaging tubes employ a target with adjustable voltage. In-
creasing the voltage to the target (SENSITIVITY) results in increased
tube sensitivity. The highest quality image is obtained when the
SENSITIVITY control is turned to its minimum position (fully coun-
terclockwise). Increased target voltage results in a poorer S/N, re-
duced dynamic range and increased lag; therefore, the SENSITIVITY
control should be increased only when the imaging system cannot
supply enough illumination or it is intentionally desired to reduce
object illumination. In this case, increase the sensitivity until the upper
range of the green LED is reached.
VA