Some days ago I comment in this group a problem with a film recording
system. Some of you comment various possibilities and we have found, we
think a magnetical field influence in the system. The idea comes from
"**THE-RFI-EMI-GUY**" (thanks a lot).
We put the system far from the transformer and the images were perfect
except one moment. We have checked that in that moment we connect the alarm
in the office and this alarm goes by mobile telephone connection. May this
phone call interference the system?.
Thanks to all.
Could be a grounding issue as well. I had a customer a long time ago that
wanted to move 700 feet of wiremold up 3 feet. I asked how he had figured it
out. He turned on the monitor to his computer and it was wavey.. He put the
monitor on a cart and moved to the end of the cables and it was fine...
hence the 3 foot request. I did some research and found the neutrals and
grounds were tied together in his local sub panel. ( supposed to be
seperate ) Contractor did not realize that the local panel was one of 30 in
the building and was not the service. All better and not much money spent.
Thanks for your response.
We have checked our ground connection in all the building and looks good.
We have put far the system from the transformer and also from the alarm and
the test has been almost perfect. ( There was only one movement in one frame
in 17 second of film, about 4 hours working the system. ) This movement is
at the same time we went out the office, so we are trying to determinate
what happened at that moment.
Now we are trying to find mu metal to cover the system.
Thanks to all,
"SQLit" escribió en el mensaje
Glad I could help Fernando.
Yes, an RF field from a mobile phone can affect the system just as the
power system can.
Your Mu metal fix is the way to go to fix what sounds like a very
sensitive and complex environment.
>Some days ago I comment in this group a problem with a film recording
>system. Some of you comment various possibilities and we have found, we
>think a magnetical field influence in the system. The idea comes from
>"**THE-RFI-EMI-GUY**" (thanks a lot).
>We put the system far from the transformer and the images were perfect
>except one moment. We have checked that in that moment we connect the alarm
>in the office and this alarm goes by mobile telephone connection. May this
>phone call interference the system?.
>Thanks to all.
The company I work for was invited to attempt resolution for a computer room
random interruption of service issue that a few other groups had failed to
locate, or correct.
It was a rather tense first meeting with much screaming, and finger
pointing. Hardware people, software people, power company, and others all
pointing towards any of the groups to shed attention away from themselves.
After a period of bringing outside IT people to analyze software
compatibility, detailed examination of the equipment and cabling in that
portion of the building, in depth RF and magnetic field measurements, and
monitoring for power quality issues, we detected intense magnetic fields
coming from one wall as the only likely anomalies. As it turned out on the
immediate other side of one wall was the main electrical room for the entire
multi occupancy building. Multiple large transformers, and other electrical
equipment right on the other side of the wall. After being advised of the
cause of their issue, and refusing to relocate the computer room, extensive
shielding was installed on both sides of the wall, and the problems ceased.
You would think someone would have evaluated the intended computer room site
a bit before spending that amount of money for it's construction. If they
had paid for a study to locate it in the worst possible location I doubt
another area would have triumphed! :-]
Remove the two fish in address to respond