A more significant question is: At what point does the tolerance affect the
result of the test? The answer to this question will give you the answer to
the original question.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
==============================================================
"Brent G DeWitt"
<[email protected]
m.com> To
Sent by: "'Price, Edward'"
[email protected] <[email protected]>
<[email protected]>
cc
03/31/2009 09:58
PM Subject
RE: [PSES] 10cm above GRP
requirement for 61000-4-6
I also find this to be a constant irritant in standards. From my old (very
old) days in machining, I’ve used the definition of plus or minus one half
the least significant digit of the measurement. Bummer for “3 meter”
radiated emissions measurements!
Brent DeWitt
Westborough, MA
From: Price, Edward [mailto:[email protected]]
Sent: Tuesday, March 31, 2009 4:35 PM
To: [email protected]
Subject: Re: [PSES] 10cm above GRP requirement for 61000-4-6
From: [email protected] [mailto:[email protected]] On Behalf Of Bob
Richards
Sent: Tuesday, March 31, 2009 1:10 PM
To: [email protected]
Subject: 10cm above GRP requirement for 61000-4-6
Fellow EMCers,
61000-4-6 says that the EUT must be 10cm above the GRP. There is no tolerance.
However, anyone that has worked in a
machine shop or in metrology knows that there is no such thing as "no
tolerance". What would be considered an
acceptable tolerance for the 10cm requirement?
If an auditor says that the support for the EUT has to be exactly 10cm, "no
tolerance", how can one argue with them
that 1mm is not going to affect the test?
The EFT standard, 61000-4-4, says 10cm +/- 1cm. Could this be used as a basis
for an argument?
Bob Richards, NCT
Bob:
FWIW, MIL-STD-461, which has been around longer than 61000 (and thus was
probably the inspiration for "10 cm"), says, in Paragraph 4.3.1., "Unless
otherwise stated...tolerance shall be... Distance: +/- 5%"
Ed Price
[email protected] WB6WSN
NARTE Certified EMC Engineer
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780
Military & Avionics EMC Is Our Specialty
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