EMI and Ferrite Cores
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Thanks for the followup Matt.
I went through some of the logs of tests performed. When there was a transformer close, it definitely cycled every 60/120/180, but with everything turned off, this is what we see
He has spoken with the manufacturers of both devices and they have been of no help unfortunately. When I get the model#'s tomorrow, I will try to give them a call and see if we can have a detailed conversation about our options. I do not expect this to be productive as the user using this equipment is pretty intelligent and understands some of this better than I do and was not able to glean any information. I am very good at cutting through red tape and double talk from tech support, so maybe I will be able to get something helpful.
FYI he is usually using a desktop to perform these tests, and the problem is apparent on both the PC and laptop (Laptop is unplugged of course)
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Very interesting
If you have access to an oscilloscope or a signal gen you could probe it out a bit further... very intrigued and I hope you let us know how it plays out!
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Page 5, try self calibration
http://www.thoughttechnology.com/pdf/manuals/SA7510 rev. 7 ProComp Infiniti User Manual.pdfTry replacing the fiber - that shit breaks so easily and I'm guessing the Doc isn't familiar with using it
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@MattSpeller so you think there may be a small break in the fiber that could be letting the EMI in, its just not bad enough to cause the unit to stop working?
Ill send this over to the user and ask him to try it
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@Brains just trying to think of the most common things to break - fiber is always top of the list.
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@MattSpeller awesome. He is receptive and will take care of that this weekend or Monday. I am open to any ideas, I was also wondering if it might be a case of "dirty power" in the building? Maybe we have some feedback from the AC Units being sent back along the line? Since this happens in many different places in the building, maybe we could install something to "clean up" the power. Before today I always considered those power cleaners a scam, but this seems like the intended usage if I ever saw one
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@Brains Power cleaners won't help you*, but I do recommend you try it outside the building in a big field or something.
*the units are battery powered IIRC
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@Brains said:
@MattSpeller Maybe we have some feedback from the AC Units being sent back along the line?
I've seen huge underground transformers cause bullshit like this before with testing gear.
Edit: they're not typically under the building though... -
I know it has been a while since I last updated, but we finally came to a resolution a few weeks ago and I haven't had a chance to update yet.
And....... it completely disappeared without a trace. haha well that is typically my luck so I wasn't too surprised.
We were able to walk around with the equipment and a laptop across the entire property, and believe we did identify the cause as our next door neighbors. They are a medical facility with some MRIs, so maybe their equipment was failing and they replaced a part.
One piece of additional information, I was able to have some really good conversations with their tech support and learned that they do have internal filters for 60Hz so that explains the absence of a 60Hz signal. I appreciate all the help from everyone on this forum. It was my beacon of light in a sea of confusing data.
Hope you guys are having a good April 1st. Don't trust everything you read
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I've used Ferrite cores a lot with cat5e on cell towers to block RF from the cellular antennas.
