In the junior high school lunch room, where basic knowledge
is minimal, the child learns how insults can replace fact.
However adults learn facts before posting. If John Doe had
basic electrical knowledge, then he would have discovered
numerous references to single point grounding. Instead, John
Doe searched newsgroups (not the web) for electrical
principals he never bothered to learn.
A John Doe educated in simple electrical concepts would have
found numerous engineering discussions about single point
ground. One from Microchip - a microprocessor manufacturer:
http://www.microchipc.com/PIC_tips_3.asp
The best way to handle the ground problem is to have different
ground systems that connect at only one point. The precision
analog REFERENCE ground should always be designed so that an
absolute minimum of current actually flows through it. In
practice this is accomplished by having all reference ground
connections terminating at a SINGLE POINT.
This is but one example. Literally every electronic part
manufacturer provides application notes that teach variations
of the single point grounding. Again, in stereo and PA
systems, the same concept eliminates something called ground
loops.
I don't know who John Doe is. But quickly he does what kids
in a lunch room do. Kids don't know facts, so instead, they
attack the messenger. John Doe obviously does not possess
basic electrical knowledge. He demonstrates why so many
computer assemblers are 'experts' - needs no freaking
education.
Don't be mislead by the naive. Make a computer systems more
reliable. A connection between motherboard logic ground and
chassis ground should be single point. With dry weather
approaching, the previously posted static electricity
experiment can demonstrate the principles. Notice the
difference between this poster and John Doe. This poster
cites professional sources AND provides experiments (static
shock a computer, or stereo system ground loops) to
demonstrate the electrical concept.
That keyboard beneath your fingers uses same single point
ground concepts. Pin 3 or pin 4 is the DC ground. Connector
shell and shield inside wire connects to DC ground at a single
point. Why? Some keyboards go even farther to keep shield
ground separate from DC ground until both meet, instead, at
motherboard. Just another example of single point grounds to
avoid failures from static electricity and noise. Two
separate grounds that meet at a common point.
Single point ground justified by electrical reasons - when
one first learns these basic electrical principles. This post
includes design examples AND the principles behind that
design. Principles that apparently so confused John Doe that
he searches newsgroups for a technical explanation rather than
consult engineering books or engineering application notes.
Best to mount a motherboard to chassis with only one
connection between the two grounds. Eliminate noise between
ground pins of computer's Integrated Circuits to make computer
more reliable. No ground transients through motherboard logic
ground means a stable computer system. Motherboard logic
ground best joins chassis ground at a single point using a
single conductive standoff.
John said:
The term "single point grounding" is buzzword nonsense in this
context. The reader can do a Usenet archive search for "single point
grounding" and then scroll down the page, noticing most of the posts
were made by "w_tom".
Antec cases come with no washers, but they come with electrically
conducting brass mainboards standoffs. Microstar International and
Asus mainboards have electricity conductive solder coated rings
around their mounting holes which are directly connected to device
ground pins, and they do not come with washers either.
You don't have to be a rocket scientist to figure out what that
means.
If what you are saying were true, which it isn't, given the contrary
circumstances, motherboard/mainboard makers would advise us to use
insulation. Clearly, we are expected to ground the mainboard at
those points. (I am speaking about mainboards which have electricity
conductive rings around their mounting holes.)
Nylon standoffs are the simple solution.
They would be, if what you're saying were true. Nylon standoffs
would be cheaper than electricity conducting brass standoffs also.
Motherboard's green solder mask is not intended to be an
electrical insulator (even though some assume so).
Electricity conductive mounting hole rings are not intended to be
electrical insulators either. The idea that any manufacturer would
use electricity conductive material for an insulator is bizarre in
my opinion.
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