NEC MultiSync MT1020 Installation Data

Visual Systems Division
Technical Bulletin
MultiSync MT820/MT1020 Installation Data
Desk Top and Ceiling Mount
Contents
Notes and Formulas
Projection Distances and Screen Sizes
Ceiling Mount (Lens Wide)
Ceiling Mount (Lens Telephoto)
Desktop Setup (Lens Wide)
Desktop Setup (Lens Telephoto)
Cabinet Dimensions
Ceiling Mount Dimensions
Notes
§
For Screen Sizes of 60 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.
Formulas
Units: Inches
M = 1.25 x W / 33.02
A = C / COSINE
B = (8 x M) + 5.598
C (Zoom Wide) = (53.2 x M) - 3.37
C (Zoom Telephoto) = C (Zoom Wide) x 1.3055
D = (3 x W / 8) - E
E = (8 x M) + 3.433
-1
= TAN ((E - 3.433) / C)
W = Width of Screen
A = Distance between lens center and screen center
B = Vertical distance between top of NEC ceiling mount and screen center
C = Horizontal throw distance between screen surface and projector lens
D = Vertical distance between projector base and screen bottom
E = Vertical distance between desk top level and screen center
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Units: Millimeters
M = 1.25 x W / 1.3
A = C / COSINE
B = (8 x M) + 142.2
C (Zoom Wide) = (53.2 x M) - 85.609
C (Zoom Telephoto) = C (Zoom Wide) x 1.3055
D = 25.4 x (3 x W / 8) - E
E = (8 x M) + 87.2
-1
= TAN ((E - 87.2) / C)
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