Christie RPMX-D120U Setup Manual page 14

Section 2: Installation & Setup
2-6
8. Reconnect DVI, AC power and IR sensor cables to the light engine. Refer to
Figure 2.1
Calculate throw distance, position and mount projector
Step 3
Throw Distance
Throw distance (also known as projection distance) is the distance measured
from the projector's front surface to the screen. This is an important calculation
in any projector installation as it determines whether or not you have enough
room to install your projector with a desired screen size and if the displayed
image will be of the right size for your screen.
The throw distance calculation for RPMX/RPMSP-D120U and the RPMSP-
D275U projectors is based on the final configuration of the projector. For lens-
horizontal configurations, throw distance is measured from the center of the
auxiliary mounting holes in the tray to the screen. Use the appropriate formula
for your projector model when calculating. See Figure 2.7. below.
Figure 2.7. Throw Distance Formula for Lens-Horizontal Configuration
In lens-vertical configurations, where a first surface mirror is used to shorten the
distance between the projector and screen by folding the optical path, throw
distance is a little more difficult to calculate, as there are many variables to
consider.
Figure 2.6. Secure light engine to configuration bracket
RPMX-RPMSP-D120U & RPMSP-D275U Setup Guide
020-100038-02 Rev. 1 (09/08)