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) This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc