On 1/13/2017 2:21 PM, Ken Javor wrote:
Why would one feel, philosophically, that it is required had to meet a limit
with a noisy peripheral? You are not responsible for the peripheral's noise
contribution, right?
One couldn't, and for the monitors, THIS one didn't have to; we didn't
buy them. But the printer was radiating noise generated in our
computer. I fixed THAT.
If my printer drivers are putting RF into a printer chassis, *that
vendor* has no duty to shield them -- and my employer will rightly be
fined for non-compliance.
The only way to be sure of compliance is to test with peripherals that
will make it obvious. QED; buy the least well-shielded peripherals that
still pass on their own merits.
You may remember the cable ferrite beads discussions with the FCC...
Some time around 1988, my brother's high resolution monitor was
interfering with TV reception in four adjoining apartments, which I was
able to fix by putting a 360-degree terminated shield over the cr*ppy
video cable a local store was selling. And it was at Tandy, maybe in
1992, that I discovered a TV-tuner card could make our system fail RE
when it was just passing computer video; they had poor shield
terminations on their external video jumper.
Guess what? There's a discussion going on now about poorly
shielded/terminated HDMI cables ... the more things change, the more
they stay the same.
Cortland Richmond
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