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From: John Wilson
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2) Gecko/20021203
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Subject: Re: Interference from power lines
NNTP-Posting-Date: Tue, 07 Jan 2003 05:22:50 GMT
Organization: AT&T Broadband
Date: Tue, 07 Jan 2003 05:22:50 GMT
Charles Perry wrote:
> "daestrom" wrote in message
>>Moving a monitor's orientation or from one side of the room to another
>>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...
> This is going to sound odd, but we had a case in Florida once where the
> buildings structural steal had become magnitized during a fault. It was
> driving the monitors in the building (near the affected wall) crazy. Now
> that one was hard to find. It was a DC field of course and did not cause
> waviness as much as it did an odd slanting offset.
> Charles Perry P.E.
My favorite along these lines was watching in the control room of a
large magnetic fusion machine. When the machine operated, magnetic
fields would ramp up over about three seconds, and the plasma would
pulse at the end of that ramp. You could watch the pictures on all the
monitors twist and shift off the screens as the field ramped up, then
come back to normal at the end of the shot.
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