Bonjour de Montreal,
In CISPR22:1997 one can read in section 8.2:
... Any mechanical activities should be performed and visual display units
should be operated as in 8.2.1.
8.2.1 Operation of visual display units
If the EUT includes a visual or monitor, The following operating rules
shall be used.
- Set the contrast control to maximum.
- Set the brightness control to maximum or at raster extinction if raster
extinction occurs at less than maximum brightness.
- For colour monitors, used white letters on a black background to
represent all colours.
- Select the worse case of positive or negative video if both alternatives
are available.
- Set the character size and number of characters per line so that
typically the greatest number of characters per screen is displayed.
- For monitors with graphics capabilities, a pattern consisting of all
scrolling Hs should be displayed. For monitors with text capability, a
pattern consisting of random text shall be displayed. If neither of the
above apply, use typical display.
The EUT shall be operated in the operating mode that generates the greatest
level of emission while satisfying the above operating rules.
In BS EN 55022:1998 one can read in section 8.2:
... Any mechanical activities should be performed and visual display units
should be operated as in 8.2.1.
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??? There is no section 8.2.1, although it is referenced in the text.
What happen to 8.2.1? obviously it has been deleted, without editorial
review, when CENELEC adopted CISPR22:1997.
What is the rational behind this? Should visual display unit be configured
as in CISPR22:1997 or is this field wide open?
The CISPR22:1997 is quite similar to ANSI C63.4 requirements. Is this
deletion some sort of denial of the ANSI method?
What should visual display units (or graphic cards as in my particular
case) do?
Any comment will be helpful.
Regards,
----------------------------------------------
Benoît Nadeau, ing. M.ing (P.eng., M.eng.)
Conformity Group Manager
Matrox
Tel: (514) 822-6000 (x2475)
Fax: (514) 822-6275
Chairman
2001 IEEE EMC International Symposium on
Electromagnetic Compatibility
Montreal August 13 to 17, 2001
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