________________________________
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] <blocked::mailto:[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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