Luminance Uniformity; Functional Performance; Acoustical Noise; Environment Requirements - Philips C500 Service Manual

2.10 Luminance Uniformity

The variation in average display luminance between any area(with dimension approximate 2 cm of
diameter)on standard flat white screen, must be less than 35% of the luminance of the brightest
area with brightness control at cut-off and contrast control adjusted to 80 nits of luminance on the
center of screen.
2.10.1 Focus
When external contrast control is adjusted for 20±1FL light output with a flat white field pattern, then
switch to a character pattern filled with "H" characters, the characters shall be readable and
distinguishable.
2.10.2 Moire
While displaying a white raster, no Moire effect shall be visible at any luminance setting 15FL.
2.10.3 Purity
Conspicuous miss-landing shall not be visible within display area. at distance of 60cm from CRT
surface at 20FL white luminance.

2.11 Functional Performance

2.11.1 Acoustical noise:

The acoustical noise shall be less than 50dB when operating in normal condition, mode change or
power on/off.
2.11.2 Turn off:
Set unit at 20FL of full white screen, then turn off unit, image should disappear smoothly, no
persistent spot and flash.
2.11.3 High voltage discharge:
The arcing due to monitor high voltage discharge shall not cause any damage to devices connected
to the monitor.
2.11.4 Tapping test:
No objectionable intermittence or noise occur while tapping top, left right, rear side of enclosure by
a rubber hammer.

2.12 Environment Requirements

2.12.1 Non-adjusting operation
25℃ ± 10℃
2.12.2 Operating
Temperature 0°C to +40°C
13