RFI
[Top] [All Lists]

Re: [RFI] Oven RFI help needed

To: rfi@contesting.com
Subject: Re: [RFI] Oven RFI help needed
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Wed, 22 Apr 2020 19:03:28 -0700
List-post: <mailto:rfi@contesting.com>
On 4/22/2020 4:19 PM, David Eckhardt wrote:
Find the wiring harness (likely a ribbon cable) that services the touch
panel and install multiple ferrites to that cable, all cables to that
module.  No promise, but clearly, you've isolated the problem module.

This assumes that the susceptibility is that internal wiring. That's possible, but my money is on common mode on external wiring -- it's the best HF RX antenna, the cause is often failure to terminate the green wire properly inside the equipment, and it's the easiest to fix without making it a science project (and voiding warranties).

And remember -- what the power and EMC world calls common mode ignores the green wire, which passes through conventional power line filters, and is usually where the noise current is! If a conventional filter helps, it's usually because it's internal and properly bonds the green wire to the shielding enclosure, NOT because of it's design as a filter.

73, Jim K9YC
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi

<Prev in Thread] Current Thread [Next in Thread>