QUESTION:
Please give me the VLF radiation emission data for the RISC System/
6000 displays, 6091-016 and 6091-019. Is it true that a color
display has approximately 4 times the VLF emissions of a monochrome?
If so, does this apply when you are using a shell only for AIX, or
does the display emit the same VLF regardless of what you are
displaying, in other words, is the VLF the same whether I'm running
AIX windows or just working with a full screen shell?
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A: Development responded that we comply with the Swedish
Standards in MPR2. We also comply with IBM standards as follows:
C-S 2-0001-030*9202 NS 948 080.06 Near Field Magnetic 08
Emissions from Visual
Display Units
C-S 2-0001-032*9202 NS 948 080.06 Near Field Electric 08
Emissions from Visual
Given that emissions vary somewhat across manufacturers, publishing
specs is generally not a good idea. I mean, that's what standards
are for: the test environment is defined very precisely, the equipment
is tested, and finally a conformance statement is produced.
As to whether a color display emits more than a monochrome depends on
model, manufacturer, mode of operation, etc. There simply is no "cut
and dried" answer. What appears to happen is that mono tubes are
driven at higher intensity levels than color ones, and that can account
for higher emissions.
Their recommendation is to go to the standards documents that are
referred to and understand the test environment. These are located
on the SIS disk and selected from the Standards Reference Compliance
List.
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I have a user who simply wants the answer to the question, is it
safer in terms of VLF emissions to use a 6091-16 or 6091-19, or a
3279 display? When using a 6091 is there any difference in VLF
when using an AIXWindows environment than when using an ordinary
shell environment or is the VLF the same regardless?
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A: The best we can do here is the following generality. The 6091
model 16, being driven at low intensity levels and with dark
background would provide the lowest emissions within the group
compared. So, the ordinary shell, everything else being equal, would
attain the lowest emission levels, using monochrome mode.
Conversely, in the windows environment, using darker colors
throughout, turning down the intensity and contrast, would approach
the minimum levels, with almost "negligible" difference.
The Kingston Development group said that they had no numbers for the
3279 but believed it would be considerably higher in emission levels
than the 6091.
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This item was created from library item Q614045 BWQMH
Additional search words:
BWQMH DISPLAY DISPLAYS HARDWARE INFO IX JAN93 OZIBM RISCOHW
RISCSYSTEM VLF 6091
WWQA: ITEM: RTA000027995 ITEM: RTA000027995
Dated: 04/1996 Category: RISCOHW
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