Nec LT100T INSTALLATION DATA

Visual Systems Division
Technical Bulletin

MultiSync LT100 Installation Data

Desk Top and Ceiling Mount

Contents

Notes and Formulas Page 1
Projection Distances and Screen Sizes

Ceiling Mount Page 2

Desktop Setup Page 3
Cabinet Dimensions Page 4
Ceiling Mount Dimensions Page 5

Notes

§ For Screen Sizes of 24 to 300 inches not indicated on the projection tables, use the formulas below.

§ Set the projection distance based on the width of the screen.

§ If the figures on the tables do not match the figures in the formulas, use the figures in the table.

§ All dimensions are in inches. Multiply by 25.4 for millimeters.

§ Distances may vary +/- 5%.

Formulas

Units: Inches

A = C / COS α
B = 3.7H / 25.4
C (WIDE) = (H x 2.026) – 2.437
C (TELE) = C (WIDE) x 1.3

αα = TAN -1 ((W x 0.375) + B) / C

H = Screen Width
Screen Width (H) = Screen Diagonal (4:3) x 4 / 5
Screen Height = Screen Diagonal (4:3) x 3 / 5

A = Distance between lens center and screen center
B = Vertical distance between lens center and screen bottom (screen top for ceiling mount)
C = Horizontal throw distance between screen surface and projector lens

αα = Offset Angle of image path center line with reference to desktop or ceiling

Page1

Visual Systems Division
Technical Bulletin

MultiSync LT100 Installation Data

Desk Top and Ceiling Mount

Projection Distance and Screen Size for Ceiling Mount

The following shows the proper relative positions of the projector and screen. Refer to the table to determine the position of
installation.

Ceiling Mount System

Screen Top

Screen Center

8.20"

B

C

α

A

Horizontal

Lens

Offset

1.63"

5.85" Deluxe Mount

Distance Chart

Screen Size A B C

Diagonal Width wide - tele wide - tele wide - tele

40" 32" 65.2" - 84.4" 4.7" 63.0" - 82.7" 14.8° - 11.4°
60" 48" 97.8" - 126.5" 7.0" 94.5" - 124.0" 14.8° - 11.4°
67" 53.6" 109.8" - 140.8" 7.8" 106.2" - 138.0" 14.8° - 11.4°
72" 57.6" 118.2" - 151.5" 8.4" 114.3" - 148.5" 14.7° - 11.4°
84" 67.2" 138.2" - 177.3" 9.8" 133.7" - 173.8" 14.7° - 11.4°

90" 72" 148.3" - 190.8" 10.5" 143.5" - 187.1" 14.6° - 11.3°
100" 80" 164.8" - 212.8" 11.7" 159.4" - 208.7" 14.6° - 11.3°
120" 96" 198.5" - 255.2" 14.0" 192.1" - 250.3" 14.6° - 11.3°
150" 120" 248.7" - 319.6" 17.5" 240.7" - 313.4" 14.6° - 11.3°
180" 144" 298.9" - 384.0" 21.0" 289.3" - 376.6" 14.5° - 11.3°
210" 168" 349.0" - 448.0" 24.5" 337.9" - 439.3" 14.5° - 11.3°
240" 192" 399.2" - 512.7" 28.0" 386.5" - 502.9" 14.5° - 11.2°
270" 216" 449.4" - 577.2" 31.5" 435.1" - 566.1" 14.5° - 11.2°
300" 240" 500.2" - No Tele 35.0" 484.3" - No Tele 14.5° - No Tele

αα

Note:

For screen sizes of 24 to 300 inches not indicated on the projection tables, use the formulas on page 1.

Page2