Hi,
The only thing that I would add to the good comments already made is that a
patch panel should always the first choice. As mentioned previously keeping
the shield currents inside the room is accomplished by being able to terminate
the shields at the patch panel. After determining that the patch panel is the
first choice reality sets in and if anything is unique getting special
connectors and feed-throughs makes the patch panel expensive and time
consuming. The suggestion of pre-drilled holes for whatever is also an
excellent way to try and be prepared for anything.
That is why it is best to have waveguides and patch panels available
depending on the situation. The other thing to know about using the
waveguide is that you need to be able to terminate the cable shields to the
waveguide for it to be effective. That would mean removing insulation on the
cable passing through the waveguide so that the shield directly contacts the
waveguide and the shield currents will go to ground at the waveguide. And as
mentioned before putting ferrites on the cable also cannot hurt. Also the
waveguide needs to be stuffed with conductive material so there won’t be any
electromagnetic environment leaking through the waveguide.
Santo (Sandy) Mazzola
EMC Engineer
West Sayville, NY
________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of Luksich
Mark-TXP763
Sent: Friday, March 13, 2009 4:08 PM
To: [email protected]
Subject: RE: [PSES] Chamber access
When I had the chambers built at Motorola / Plantation, I put a patch panel
into the side of my chambers and got a number of standard connector in the
panel, from USB to DB25 to Firer optic as well as N, BNC, SMA along with a
series of pre drilled holes with plugs plugs for "whatever".
Due to the local environment (people having 75W base stations at there desk
leaking 5W) I specified two door split chambers one for the EUT and one for
the test equipment.
Mark
Mark S. Luksich
DMTS - Regulatory Engineering
Office: 631-738-5134
Mobile: 631-827-9385
Fax: 631-738-3776
e-mail: [email protected] <mailto:[email protected]>
________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of Brent G DeWitt
Sent: Thursday, March 12, 2009 7:31 PM
To: [email protected]; [email protected]
Subject: RE: [PSES] Chamber access
Hi Ken,
Having run a couple of third party labs, I’d suggest you do both, and
several of each.
The WBC is the penetration of choice for simple fiber optic cables and weird
stuff. Make it big enough (and therefore long enough) that you can send
arbitrary metallic cables through with a load of snap-on ferrite beads on them
(pick the beads of your choice).
The patch panel has the primary advantage of keeping shield currents inside
the room. There are lots of companies out there selling data filters for
standard connectors. On the down side, you will never be able to match all of
your customer needs.
I’d also suggest that you have a dozen or so of your blank patch panels
fabed with just the mounting details and a drawing of these available for
customers. No matter how much you try, you _will_ have a customer that needs
something unique! Either sell them a blank panel (at a profit) or give away
the specs for the panel as a cheap alternative. Many customers will elect to
buy the panel. Price appropriately for your operation.
Respectfully,
Brent DeWitt
Westborough, MA
From: Ken MacGrath [mailto:[email protected]]
Sent: Thursday, March 12, 2009 6:34 PM
To: [email protected]
Subject: [PSES] Chamber access
Hello,
We're upgrading our 3 meter chamber and would appreciate any suggestions you
might have for running cables into the chamber from the support equipment. We
have a wave guide and could put in a patch panel, but before we do that I
would like to get some input from the group
Thanks!
Ken MacGrath
_____________________________________________________________________
Core Compliance Testing Services, LLC
79 River Road (Route 3A)
Hudson, NH 03051
Business: (603)889-5545
Cell: (603) 892-0620
Web: www.corecompliancetesting.com
________________________________
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