In the absence of 8.2.1, the scrolling "H" pattern with controls at maximum is the setup of choice when testing monitors. Most labs/agencies will use this setup when performing their testing. In MS Windows, you may open several 'windows' to fill the screen.
I recommend that you pay particular attention to the DOT clock rates, resolution and scanning modes of the monitor, selecting the highest, middle and 'lower' DOT clock rates for your testing. Also, note that the non-interlace scanning mode tends to exhibit more noise than the interlace mode. Both should be checked, though. Bandele Jetstream Communications, Inc. [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Tuesday, May 09, 2000 12:43 PM To: [email protected]; [email protected] Subject: RE: Where is 8.2.1 is EN55022 ? Early B&W monitors were tested with scrolling "H" to produce maximum emissions and reproducibility. With the newer monitors, noise does not appear to be so pattern-dependent. For an unknown unit, I would experimentally try several screen displays to determine pattern dependence (if any) and note the reasoning for your choice in the test report. A color pattern may emit more than a simple text (e.g. letter H) pattern. David Sterner ______________________________ Reply Separator _________________________________ Subject: Where is 8.2.1 is EN55022 ? Author: "Benoit Nadeau" <SMTP:[email protected]> at ADEMCONET List-Post: [email protected] Date: 5/9/2000 1:06 PM 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. | | | | | | ??? 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 ---------------------------------------------- ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
