Sorry Dennis,
you are not correct. Nominal means:
b : of, being, or relating to a designated or theoretical size that may vary
>from the actual.
This is from Websters.
As you indicate, there is NOTHING that says it has to be 1 by 1.5m
I'm sorry to be so anal about this, but it is happening too much where
assessors are assessing to opinions and personal agendas. We must follow the
standard. Usually there are MUCH bigger fish to fry than quibbling over
something like this
I repeat, again, that there is NOTHING that says the table SHALL be 1 by 1.5m.
Only then could a deficiency be written.
Sincerely,
Derek.
On 10/11/2011 11:43 AM, Dennis Ward wrote:
Both ANSI C63.10 and ANSI C63.4, the typical standards for which
ISO17025
accreditation is used, contain the following statement, “Tabletop devices
shall be placed on a nonconducting platform, of nominal size 1 m by 1.5 m,
raised 80 cm above the reference ground plane.
While a bit more open to variation due to size of equipment, CISPR 22
has the
statement “Equipment intended for tabletop use shall be placed on a
non-conductive table. The size of the table will nominally be 1,5 m × 1,0 m
but may ultimately be dependent on the horizontal dimensions of EUT.
So while you may challenge the accreditation organization, they are
correct,
your table does not meet the ‘nominal’ size requirements for at least the
two standards ANSI C63.4 and C6310.
Other standards may also have the nominal size issue as well.
Thanks
Dennis Ward
Director of Engineering
American Certification Body
Certification Resource for the Wireless Industry http://www.acbcert.com
703-847-4700 fax 703-847-6888
direct - 703-880-4841
From: [email protected] [mailto:[email protected]] On Behalf Of Grace
Lin
Sent: Tuesday, October 11, 2011 4:16 AM
To: WNya
Cc: EMC-PSTC
Subject: Re: Table Size in Emissions test
Wendy,
When I look for an accredited ANSI C63.4 laboratory, I expect the
laboratory
has the facility as stated in the standard, including a standard size of the
table as defined in the standard. For this reason, unless the accreditation
certificate bears a restriction note, I support the auditor's comment.
From the other point of view, many manufacturers' laboratories are for
internal use only, including my employer's. For this reason, the auditor may
be willing to accept the smaller size of the table. The question is how to
determine if the laboratory is for internal use only (for testing certain type
of products). An example is Alcatel-Lucent's EMC laboratory in New Jersey,
USA. It opens to the general public.
With regards,
Grace
On Mon, Oct 10, 2011 at 7:54 PM, WNya <[email protected]> wrote:
Dear Experts,
Recently my company went through the first ISO17025 audit. We have a
table
smaller than the standard requirement of 1.5m x 1m since our products are
small, typically 10cm x 10cm x 10cm. The height of our table was 0.8m. The
auditor wanted us to change the table size to follow the standard.
What does it matter since we never use the extra space on the table? I
do
agree we must keep to the height requirement since the floor is a ground plane
and thus it sets a fixed capacitance to the EUT and also controls the lengths
of any attached cables.
Can we reject or challenge the auditor's request? Has anyone experience
the
same situation?
Sent from Wendy.Nya iPhone
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