[PLUG] EMF help needed Additional note

[Fred James]

Jim Garrison wrote:
> On 6/26/2015 6:44 AM, Richard Owlett wrote:
>> Fred James wrote:
>>> Jim Garrison wrote:
>>>> LCD monitors are not subject to magnetic interference the way
>>>> CRTs were, so making a Faraday cage out of aluminum foil will not
>>>> work.  The fan is causing your power to fluctuate.  It shouldn't
>>>> be doing that, and if it does there may be a problem with the
>>>> building's wiring.  You should notify your building management
>>>> and ask them to get an electrician to come out and diagnose the
>>>> problem with the fan.  There's a *small* chance this could be a
>>>> fire hazard in the fan.
>>>>
>>> Jim Garrison This is an interesting thought, and interesting
>>> information.  One more question ... there are two monitors in this
>>> room, about 6-7 feet apart. The one near the outside wall is the
>>> one that "flickers" and goes black.  The one 6-7 feet further in
>>> seems not to be effected at all. Both Monitors are on UPS (separate
>>> UPS for each system), and both UPS are plugged into the same wall
>>> socket.  Does that information effect your thoughts on this issue
>>> in any way? Thank you Regards Fred James
> Physically swap the monitors (i.e. move them) and see what happens.
> If the same monitor continues to have a problem then that monitor
> is overly sensitive to voltage transients.  If the problem stays
> near the outside wall, then it's likely the UPS that has the problem.
> For step 2, leave the monitors swapped and physically swap the
> UPSes. That should confirm where the problem is.
>
>> Additional note ... the UPS supporting the blinking monitor also
>> supports the desktop machine, and two network devices ... only the
>> monitor (as far as I can tell) is suffering.
> The desktop machine has a power supply that is designed to cope with
> wide input fluctuations of the type caused by other loads on the
> input power line.  It isolates your computer quite effectively.
> The network devices may just not be very sensitive, or their wall-warts
> do a reasonable job.
>
> Note that typical consumer UPSes do not isolate downstream equipment
> from voltage fluctuations that do not also trigger a switchover to
> battery power.  I.e. it's not a power conditioner.
>
> Based on your comments I think it's more likely that either the monitor
> or UPS is the problem, with the monitor's power sensitivity the most
> probable cause.
>
Thank you (all) ... testing that now ... I shall let you know the results
Regards
Fred James