Chapter 4 Mechanical Adjustments 15
2.
3.
4.
5.
The rear ratchet should sit below the base of the skull, as shown in the dia-
gram above.
The cable should fall down the user’s back--not over the shoulder. The ca-
ble weight provides counterbalancing for the display weight.
It is easier to don the
FS5
with the earphones in anup position--out of the
way. After the other adjustments are made, it is easy to bring the earphones
down. While pulling them down, pull them out away from the head to
avoid bending your ear.
IPD, display height, and fore/aft motion adjustments are performed together
to optimize the view.
lnterpupillary Distance (IPD)
IPD range = 48-73 mm. This range is sufficient to cover from 1st percentile
teenager women to 99th percentile adult men. It should also cover a large per-
cent of younger children, but we don’t have statistical information on younger
population groups.
Adjust until both images are evenly visible. Close one eye to confirm the image
is centered in front of the other eye. Incorrect positioning of the IPD adjustment
will lead to eyestrain.
Fore/Aft motion of shell
Pull shell away for easy donning. Push toward face to maximize field of view
and to block ambient light. Eyeglasses can be worn with FS5, simply leave
fore/aft adjustment near the outer position.
Fore/aft motion is controlled by a detent set screw that is accessible through a
hole at the center of the aluminum bracket at the top inside of the shell. It re-
quires a .050’* hex head wrench to adjust. This tool is provided with the FS5.
The location of the set screw is shown in the diagram below:
Captive
Fore/Aft Tension
