Alignment / Focusing - Reichert AP250 User Manual

Alignment / Focusing

The AP250 can be optimally focused at projection
distances between 10 ft (3 m) and 26.5 ft (8 m)
when the patient and projector are equidistant
from the projection screen.
1. Project a 20/200 or 0.1 character onto the
screen by pressing the
2. Check the three-dimensional alignment of the
system. To optimize the alignment, it may be
necessary to angle the screen to direct light
towards the patient's head. As a test, place a
mirror on the screen. The light should project
where the patient's head would be (see
Figure 3).
3. Adjust the image positioning on the screen. It
may be necessary to adjust the projector and
the screen. Secure projector by tightening
mounting screw.
4. Determine the proper letter size based on the
refracting distance used. Refer to the Letter
Sizing Charts at the end of this manual (pages
12 & 13).
5. Attach Letter Sizing Chart to the screen.
6. Open the projector cover by removing the
hexagon screw under the front of the AP250.
7. Move the AP250's focusing controls (see page
5, # 11 & 12) until the 20/200 or .01 "Z" is in
sharp focus and fills the bracket on the Letter
Sizing Chart, as shown in Figure 3.
NOTE: To obtain longer refracting distances in
small rooms, a mirror or system of mirrors can
be used. A high quality front-surface mirror is
required. See Figure 4 as an example of a short
room with a full refracting distance of 20 feet.
NOTE: To prevent interference with the
operation of the Remote Control window, care
should be taken not to position any bright lights
directly toward the front of the AP250.
WARNING: Proper setting of the focus
and distance controls requires that
the projector cover be open while the
instrument is plugged in and turned
on. Utilize only the distance and focus
controls while the cover is open.
Do not touch any other components
under the cover or personal injury
may result.
13800-101-Rev. E
key.
Spot of
Light on
Wall
Figure 3 - Checking three-dimensional alignment.
Screen
Figure 4 - Using a mirror system in a small room.
Patient
AP250
Patient
AP250
Mirror
Screen
Patient
Mirror
Small
Mirror
7