Hi Gary,
You're lucky I have a relatively free lunch hour today. I have a copy of that
book here. From
Problem 6.2, looking into your dilemma and using equation 6.2 and Table 6.1,
the answers were easily
calculated. Following are my results.
For Copper (and from Table 6.4):
Frequency Skin Effect
1MHz 0.06597mm 2.5973mils
100MHz 0.00660mm 0.2597mils
1GHz 0.00209mm 0.0821mils
For Steel (SAE 1045):
Frequency Skin Effect
1MHz 0.00660mm 0.2597mils
100MHz 0.00066mm 0.0260mils
1GHz 0.00021mm 0.0082mils
As you can clearly see, copper and steel have different skin effect
characteristics. And actually,
the skin effect values from Clayton's book do match with the values I've
obtained here. I'm not at
all sure why you think they are the same.
However, I hope this helps.
Best regards,
Ron Pickard
rpick...@hypercom.com
garymcintu...@aol.com
Sent by: To:
emc-p...@ieee.org
owner-emc-pstc@majordo cc:
mo.ieee.org Subject: Clayton Pauls -
Intro to EMC - an error or two? for those that have the text
08/08/2003 10:33 AM
Please respond to
GaryMcInturff
My anal-retentive self is having some trouble with an occasional
example in the text and I
need either a confirmation or a slap in the forehead.
I was just fiddling around with the text and reviewing some of the
examples and in section
6.4 he presents a table of skin depth for copper, but then in question 6.2 he
asks for the skin
depth of steel - and the numbers for the skin depth are the same. My
calculations say otherwise and
makes sense to me since the permeability is different between the materials.
copper = 1 and steel is
1000, that and the conductivity is different between the two.
If you have the text and little or nothing else to do could you give me
the number you come
up with? ( in mm's or mils)
When I'm trying to learn or relearn stuff and I'm at odds with the
various references it just
drives me wild and I don't have anyone else to confer with up here. One is
torn between the I'm
right response and the author's obvious authority on the subject.
Thanks
Befuddled (Gary)
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