NEC Solutions (America), Inc.
Visual Systems
LT240 Installation Guide
Desktop and Ceiling Mount
D = 0.1503H - 0.021
v3.0
www.necvisualsystems.com Page 1 of 7
Contents
Product Description, Lens Specs, Notes and Formulas Page 1
Projection Distances and Screen Sizes
Ceiling Mount Installation
Page 2
Desktop Setup
Page 3
Cabinet Dimensions
Top, Front and Right Side
Page 4
Bottom, Back and Left Side
Page 5
Ceiling Mount Dimensions
Page 6
Control Codes
Page 7
Product Description
Type: Single chip DMD
TM
projector Dimensions: 10.24”(W) x 4.74”(H) x 12.56”(D)
Native Resolution: 1024 x 768 (XGA) Weight: 7.1 lbs
Brightness: 1600 ANSI Lumens
Lens Specifications
Throw Ratio: 1.5 - 1.9:1(approx.) Focal Length: 22.4mm – 27.0mm
Offset Angle: 15.8
°
-18.8
°
(approx.) F/#: 2.5 – 2.9
Screen Sizes: 30”-500” Manual Focus/Manual Zoom
Notes
For screen sizes not indicated on the projection tables, use the formulas below.
If the figures on the tables do not match the results of formulas, use the figures in the table.
The ceiling must be strong enough to support the projector and the installation must be in accordance with any local
building codes.
• All calculations are based on 4:3 aspect ratio.
• Distances are in inches, for millimeters multiply by 25.4.
• Distances may vary ±5%.
Formulas
Units: Inches (for millimeters multiply final number by 25.4)
Definitions:
H = Horizontal Screen Width (4:3)
V = Vertical Screen Height (4:3)
B = Vertical distance between lens center and screen center
C = Throw distance
D = Vertical distance between lens center and screen top (screen bottom for desktop application)
α = Throw Angle
Projection Formulas:
Screen Formulas (4:3):
B = 0.5253H – 0.021 H = Screen Diagonal x 4/5
C (wide) = 1.5607H – 1.751 V = Screen Diagonal x 3/5
C (tele) = 1.8789H – 1.694 Screen Diagonal = H x 5/4
α (wide) = tan
-1
(B/C(wide))
α (tele) = tan
-1
(B/C(tele))
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