DESIGNERCOUNCIL Archives

October 1998

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Subject:
From:
Douglas McKean <[log in to unmask]>
Reply To:
DesignerCouncil E-Mail Forum.
Date:
Tue, 27 Oct 1998 12:52:45 -0800
Content-Type:
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text/plain (38 lines)
Ok, you guys got me.  I didn't think it's take this long.
I confess.  The gig's up.  I'm the one ...

About 15 years ago in another company far away, I brought
a product into a reputable lab to be tested.  It "passed",
if I remember correctly, by -0.5 dB.

The confidence "acid test" back then was (and I'm not joking)
"if it can pass with the - worst case configuration - being the
 monitor on it's side placed on top of the EUT with a topping
 of cables tied in a bow-tie, then it should pass in any other
 reasonable configuration."

Well, too many people (like me) screamed about these crazy
configurations.  Now, you can't do that type of cable
manipulation/configuration anymore.  So, the confidence test
had to change.  And well it should.  How that boss I had to
answer to back then thought that every single product would
be rock steady at -0.5 dB with no distribution of data was
and still is beyond me.  We aren't talking about a single
car on the highway going the speed limit, we're talking
about a whole herd of cars on the highway.

The current calculation of error is fairly applied without
having to resort to tying everything up into a bow-tie.

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