Subject: Re: Interference from power lines
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Date: Tue, 07 Jan 2003 02:45:33 GMT
NNTP-Posting-Date: Mon, 06 Jan 2003 21:45:33 EST
Organization: Road Runner
"Tom Del Rosso" wrote in message
> If anyone can make sense out of this, please reply.
> On Wednesday, 1/1, the power lines right outside an office fell to the
> street, still alive. They were repaired but the next day, in the office
> of 11 computers, all but 3 monitors have wavy screens to various
> degrees, from annoying to severe. The office is atop an incline, so
> it's at the height of the power lines, but they are still 50 feet away.
> The location is Long Island, NY, and the provider is LIPA. The
> interference continued at least through Friday.
> My first thought was magnetic interference, but there is no high-power
> equipment inside, except for one unplugged electric heater. The
> monitors least affected are on opposite sides of the office, and so are
> the monitors most affected. Moving a monitor made no difference to it,
> so there is no correlation with position within the room.
Moving a monitor's orientation or from one side of the room to another would
have an effect if it were caused by a stray E-M field from outside. I
wonder if the fault that happened caused some damage. Were the monitors
normally left on (perhaps in power-save mode) over the holiday? If there
was some sort of voltage brownout or spike, perhaps they were damaged
Is the voltage supply at the wall outlet normal? Perhaps a low voltage
(because of the temporary rig that LIPA put in) is enough to run computer
and power monitor, but not enough for proper operation? Easy to check...