Benq PB6200 Manuale Utente

92 

This document describes critical optical related test definitions and Instructions for data or 

video projectors. The other general terminologies are specified in ANSI IT7.228-1997. 

 

1. The unit under test should be allowed to stabilize without further 

adjustment for a minimum of 

5 minutes

, at nominal ambient room 

temperature of 25

°C, before making measurements. 

2. Measurements shall take place in a light proof room, where the only 

source of illumination is the projector.    Less than 

1 lux

 of the light 

on the screen shall be from any source other than the projector. 

3. All measurements shall be made on flat screens that do not provide 

any advantage to the performance of the unit 

4. All measurements shall be made at standard color temperature 

setting, 100% white image (per ANSI IT7.228-1997), except 

where noted 

 

1. When measuring contrast manually, operators should not wear white clothing since 

light reflected from white clothing can influence the measurement. 

2. Unless otherwise specified, the projection lens is set in the widest zoom position since 

zoom function can influence the measurement. 

3. Measurement should be performed with Minolta Chromameter, Model CL-100, or 

equivalent. 

 

ANSI Lumens = (L1+L2+L3+L4+L5+L6+L7+L8+L9)/9 (lux) x A(m^2) 

A (Area) = W * H    (m^2) 

W: width of projected image (m) 

H: height of projected image (m)