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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