Oops, too fast on the draw today.
As Ken points out, the cable height above the ground plane in the MIL standard
is 5cm, not 10cm. I must have been thinking about the distance of the EUT from
the front edge of the GP.
Anyway, despite my slight error of +100%, the citing about the tolerance is
still valid. Now I'll go look for a place to hide & do penance.
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
________________________________
From: Ken Javor [mailto:[email protected]]
Sent: Tuesday, March 31, 2009 1:44 PM
To: Price, Edward
Subject: Re: 10cm above GRP requirement for 61000-4-6
Hmmm, in MIL-STD-461, it is 5 cm....
Ken Javor
Phone: (256) 650-5261
________________________________
From: "Price, Edward" <[email protected]>
Date: Tue, 31 Mar 2009 13:35:08 -0700
To: <[email protected]>
Conversation: 10cm above GRP requirement for 61000-4-6
Subject: RE: 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] <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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