[RFI] USB Cable Shield Resistance was: Re: [N1MM+] open question about RFI & USB

[Frank W3LPL]

This is an excellent and very readable cable and connector EMC reference

www.emcstandards.co.uk/files/part_2_text_and_graphics_21_may_09.pdf

It covers many of the most important cable and connector EMC design
and construction practices including:

EMC relative effectiveness of various cable shield types

The importance of 360 degree shield bonding to connectors

The importance of 360 degree connector bonding to shielded enclosures

The importance of 12 inch minimum physical separation of cables
carrying low level signals from those carrying high level signals,
for example:
 - physical separation of cables carrying low level and very low level signals
      *low level digital signals
      *very weak signals connected to radio receivers
 - from cables connected to high level signal sources and AC power
     *coaxial cables connected to radio transmitters
     *cables connected to AC power mains
   
73
Frank
W3LPL

----- Original Message -----
From: "K9YC" <jim at audiosystemsgroup.com>
To: "rfi" <rfi at contesting.com>
Sent: Tuesday, January 16, 2024 2:58:05 PM
Subject: Re: [RFI] USB Cable Shield Resistance was: Re: [N1MM+] open question about RFI & USB

On 1/16/2024 2:36 PM, Clay Autery wrote:
> IME, range from "not measurable with commonly available equipment/technique

My 40 year old Fluke 8060A will get down below 0.1 Ohms.

The issue is not shield resistance, but rather 1) whether it is a shield 
or a wire, 2) the quality of the shield, and 3) where it is connected on 
both ends.

73, Jim K9YC

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