In message <000801c7d98b$925b7fa0$6b01a8c0@Toshibanotepad>, dated Wed, 8 
Aug 2007, Derek Walton <[email protected]> writes:

>I'm curious if anyone has developed a mathmatical equation that 
>describes the upper and lower limit lines of a LISN's Impedance curve.

Which LISN? There are several.
> 
>Would save trying to figure the data values from a graph.
> 
Indeed, a graph is not really suitable for that; many standards include 
an equation or a table of values.
-- 
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
There are benefits from being irrational - just ask the square root of 2.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

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