Hi, We got very good results with HDMI Crestron cables.
I have some pictures if anyone wants to see a good shielded versus not that good, but still sold as shielded HDMI cables. Big difference. We tested several ones and also noticed different results even on good shielded cables. Sincerely, Dieter Paasche Senior Product Developer Electrical / EMC Compliance [email protected] Work: (519) 744-8005 Ext. 7211 www.christiedigital.com 809 Wellington St. N. Kitchener, Ontario N2G 4Y7 Canada This e-mail message (including attachments, if any) is confidential. Any unauthorized use, distribution or disclosure is prohibited. If you have received this e-mail message in error, please notify the sender by reply e-mail or telephone and delete it and any attachments from your computer system and records. -----Original Message----- From: John E Allen <[email protected]> Sent: Thursday, April 29, 2021 1:47 PM To: [email protected] Subject: Re: [PSES] EMC/EMI Cables - Don't cut yourself CAUTION:This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. "Pretty Similar" story from about 8 yrs ago when working as a contractor for a UK division of a very large Oil & Gas instrumentation contractor: The DUT consisted of a surface control & interface unit and a "downhole" (i.e. goes down inside the metal casing of a oil well extraction pipe) measuring unit, and, for testing purposes on the surface, connected by an about 2m long cable assembly. Took it for Class A RE testing at a very local lab, but stopped the test after about 20 mins when it was clear that the DUT was "spewing" RF "everywhere" across the spectrum I immediately had a pretty good idea where the problem lay because everything but the connecting cable was pretty much solidly metal-cased - thus the cable was the prime suspect. Back in the lab, I disassembled the cable = 2 lengths of reasonably well shielded cable - but joined in the middle by a small electronic interface unit in a plastic box with only a very thin stranded conductor between the screens of the two cables! (The original designers were generally very good and clued up, but had little concept of EMC design & control!). Long story cut short: replaced the plastic box with a metal one with 360 deg shielded metal cable glands at each end, and introduced 360 deg shielding on the cable connecters to the control unit and the downhole measuring unit -> result = passed Class with a reasonable margin, but it cost the company well over £300 to replace the cables in each of the 200+ kits that they had already shipped, AND a lot of time & effort to do that! "Simple" good EMC design practice much earlier on would have saved that company a LOT of heartache & cash! John E Allen W. London, UK. -----Original Message----- From: David Garnier <[email protected]> Sent: 29 April 2021 18:10 To: [email protected] Subject: [PSES] EMC/EMI Cables - Don't cut yourself Story. This happened 20+ years ago so don't shoot me. An outside vendor was supplying the Operator Interface Console for our new Ultrasound machine. This console was a slick EMC design, each of the 11 or more rotary encoders that used low power CPU's that went to sleep after rotation. I was told the PIC chips were parasitic powered to reduce EMC. Wow, nice considering diagnostic Ultrasound was essentially a multi channel sub-microvolt receiver with a piezoelectric transducer as the patient antenna. The new machine was failing RE on the 10m OATS and the operator interface console EMC Engineer came to visit us to see why. "How good are your 360 degree shielded connectors?" "We don't know." The EMC Engineer then looks at us and says some to the effect, "Oh goody, this is the part I like the most." He whips out his pocket knife and starts pealing off the hard plastic over-molded connector... The project engineer and myself looks at each other with our mouths hanging open while the connector was being dissected - and then the EMC guy cuts himself. I felt bad for him, he was a "sharp" EMC engineer and he did find the problem. Moral to this story - Don't cut yourself! Dave Garnier - Retired GEHC Dave Garnier - Retired GEHC - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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