-----Original Message-----
From: John Woodgate [mailto:[email protected]]
Sent: Monday, February 26, 2001 1:52 PM
To: Jon D. Curtis
Cc: Flinders, Randall; [email protected]; [email protected];
[email protected]; [email protected]
Subject: Re: Calibration of test equipment
<[email protected]>, Jon D. Curtis <jdc@curtis-
straus.com> wrote:
>I personally think this interpretation is overly severe, but we comply with
it
>because we want our test reports to be accepted by authorities who think
this
>process is reasonable.
You are effectively succumbing to technological blackmail, and making
resistance to such nonsense that much more difficult for others.
I suppose the idea is that the calibrated equipment might catch an
'uncalibrating' infection from other equipment. (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only. Phone +44 (0)1268 747839
Fax +44 (0)1268 777124. http://www.jmwa.demon.co.uk Foxhunters suffer from
tallyhosis. PLEASE do not mail copies of newsgroup posts to me.
-------------------------------------------
John:
Actually, the "infection" model isn't all that strange.
I have had the unfortunate experience of having damaged an RF signal
generator by connecting it into a power splitting network while also
applying RF power to another port of that network. It served as a good
reminder that you have to always watch were the power really flows, as well
as where it's supposed to flow.
As soon as a "reference" device goes out into the general lab population,
it's subject to physical and electrical abuse. It may take you quite a while
to notice that some device has just one attenuator range that's damaged (but
not completely blown, just shifted a bit).
As far as I'm concerned, once a device hits the general lab population, it's
no more reliable than anything else out there. (Although I may put a bit
more faith in the most recently calibrated item, simply since it's likely to
have had the least exposure to trouble.)
Regards,
Ed
Ed Price
[email protected]
Electromagnetic Compatibility Lab
Cubic Defense Systems
San Diego, CA. USA
858-505-2780 (Voice)
858-505-1583 (Fax)
Military & Avionics EMC Services Is Our Specialty
Shake-Bake-Shock - Metrology - Reliability Analysis
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