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?.
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.
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,
Fernando
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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.
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! :-]
Louis--
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