In message <[email protected]>, dated Wed, 4 Jul 2007, Curt 
McNamara <[email protected]> writes:

>I certainly don't disagree with this, and see a fair amount of the 
>variation from set-up and not measurement. Yet if I do a test in MN and 
>then send the equipment to a lab in CA for a client to redo the test 
>the chance of a substantial variation exists. Technically this is 
>+/-3dB as I understand it,

It isn't a fixed amount, of course, and the 'typical' value is different 
for different tests.

>although I do agree that 3dB overall is more realistic.

In what sense? It is *desirable*, in fact 0 dB overall would be even 
more desirable (!), but +/-1.5 dB only *feasible* for some tests.
-- 
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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