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NNTP-Posting-Date: Mon, 15 Apr 2024 19:41:58 +0000
From: Joe Gwinn <joegwinn@comcast.net>
Newsgroups: sci.electronics.design
Subject: Re: Predictive failures
Date: Mon, 15 Apr 2024 15:41:57 -0400
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On Mon, 15 Apr 2024 10:13:02 -0700, Don Y
<blockedofcourse@foo.invalid> wrote:

>Is there a general rule of thumb for signalling the likelihood of
>an "imminent" (for some value of "imminent") hardware failure?
>
>I suspect most would involve *relative* changes that would be
>suggestive of changing conditions in the components (and not
>directly related to environmental influences).
>
>So, perhaps, a good strategy is to just "watch" everything and
>notice the sorts of changes you "typically" encounter in the hope
>that something of greater magnitude would be a harbinger...

There is a standard approach that may work:  Measure the level and
trend of very low frequency (around a tenth of a Hertz) flicker noise.
When connections (perhaps within a package) start to fail, the flicker
level rises.  The actual frequency monitored isn't all that critical.

Joe Gwinn