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16
OPERATION PROCEDURES
Next, use the joystick to position the measuring head in front of the test ball while looking into
the eyepiece, so that the mire images show up in the field of view.
The mire image in the center of the field of view will be seen as a double image as shown
below, when the instrument is not positioned at the correct distance to the test ball.
The instrument will be set to the correct distance when the double images in the center of the
field of view are unified into a single image by adjusting the joystick. The unified image should
be located approximately in the center of the field of view at this time. But, if it is not, use the
joystick to center it properly so that it is concentric with the double images in the center of the
field of view.
(3) Measurement
Three mire images, as shown above, should be seen in the eyepiece at this time, and the hori-
zontal knob and vertical knob should be turned to unify the "|" mark of the left mire image with
the "¦" mark of the center mire image, and the "---|---" m ar k o f t h e t op m i r e i m age with the "--|--"
mark of the center image, which will be the result of the measurement, to be read as follows:
V
H
38.5
3938
38.5
3938
8.5 8.6 8.7
8.5 8.6 8.7
V
H
38.5
3938
38.5
3938
8.5 8.6 8.7
8.5 8.6 8.7
V
H
45.5 44.5
45
45.5 44.5
45
7.6 7.5 7.4
7.6 7.5 7.4
Reading of the vertical scale: 7.50mm (45.0 dptr)
Reading of the horizontal scale: 7.50mm (45.0 dptr)
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