23
OPERATION PROCEDURES
(2) Changing aperture and slit length
By operating the aperture and slit length control knob, 7 different circular beams of light are
available at full aperture: 9, 8, 5, 3, 1, and 0.2mm dia. With a slit image, the slit length can be
changed continuously from 1 to 8mm with this knob.
The values obtained are indicated through the display window.
(3) Rotating the slit image
By moving the aperture and slit length control knob horizontally, the slit image is rotated from
the vertical through any oblique angle to the horizontal.
The angle of image rotation is indicated by the rotation angle scale.
Rotation angle scale