I would think that any situation we could talk about still has a maximum of
uncertainty, analog or digital readout not withstanding.
Michael Sundstrom
NOKIA
TCC Dallas / EMC
ofc: (972) 374-1462
cell: (817) 917-5021
amateur call: KB5UKT
From: [email protected]
[mailto:[email protected]]On Behalf Of ext
[email protected]
Sent: 01 November, 2004 10:54
To: Brian O'Connell
Cc: [email protected]
Subject: Re: IEC 17025 certs
I agree, they should provide their MUs. I believe that they are saying that
their MUs may not stay the same when the equipment is used in another
environment or location.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
=======================================================
"Brian O'Connell"
<boconnell@t-yude
n.com> To
Sent by: [email protected],
owner-emc-pstc@LI [email protected]
STSERV.IEEE.ORG cc
Subject
11/01/2004 10:21 IEC 17025 certs
AM
I am reviewing potential calibration contractors, and have noted the
following, or similar, on some of their IEC17025-referenced certs. The
following is noted when there is no uncertainty listed for some
measurements and/or instruments:
"The uncertainty of scale verification is highly dependent on local
conditions such as the resolution of the scale. Any statement of best
uncertainty would therefore be misleading..."
Huh ?!?!
According to clause 5.4.6 of IEC17025 "A calibration lab ... shall have and
shall apply a procedure to estimate the uncertainty of measurement for all
calibrations and types of calibrations".
The purpose of listing a specific scope accreditation is to state what can
be expected from a facility and its techs. If the accreditation agency
cannot support its audit with empirical data, under specific test
conditions, then of what use is the IEC17025 certificate ? (Not a
rhetorical question).
I need to verify that, after instrument and measurement uncertainty, that
the contractor can give me at least a 4:1 TAR.
luck,
Brian
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