[SI-LIST] Re: How to measure voltage drop on plane

Can somebody tell me for what reason you would like to know the voltage 
drop on a ground plane. If this voltage could be measured it doesn't say 
anything on what probably would appear at some inputs connected to this 
plane nor does it say anything on what it means for EMI. The local fields 
will mainly determine these voltage levels and emission level. Measuring 
voltage drop between 2 positions (e.g. A and B) on a wire or plane will 
result in arbitrary values: 0 V is possible with a large distance between 
A and B as well as a high value when the distance is zero. It becomes more 
complicated when current distribution is not homegeneous anymore  and 
wavelengths are comparble to or smaller than the conductor dimensions. 
In my opinion the transfer impedance of a connection for signal transfer 
is more important: the lower this impedance the lower the induced voltage 
in the ground conductor. 
Kind regards
Boris Traa

System design engineer EMC

PDSL/EMC3
Building WDV, room 1.01
Prof Holstlaan 4
5656AA Eindhoven, The Netherlands
Tel: ++ 31 40 27 43766
Fax: ++ 31 40 27 42224
E-mail:  boris.traa@xxxxxxxxxxxx Seri: btraa@nlsce1

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