On Sun, Mar 20, 2005 at 05:32:39AM -0500, G3rzp@aol.com wrote:
>
> In a message dated 19/03/2005 22:27:10 GMT Standard Time,
> philc@texascellnet.com writes:
>
> but are useless if you
> > actually want to know the power output.
>
>
>
> +/-5% works out, according to my calculator as +/- 0.22dB. Prodigious!!!
>
> If we go look at professional standards for 'Type Approving' equipment, we
> see that an approved accreditation lab is supposed to measure to +/- 0.75dB
> at
> 99.9% certainty. That's nearly 19%.....
>
> So personally, I trust the '5%' claim as much as I do a politician.....
>
> There has been a lot of work done at ETSI, the European Telecommunications
> Standards Institute, on measurement uncertainty. The reports are pretty major
>
> things, but you can download them free from _www.etsi.org_
> (http://www.etsi.org)
>
> The ones on measurement uncertainty are TR100 028-1 V1.4.1 and TR100 028-2
> V1.4.1
>
> They should help you get to sleep.....
Somewhere I have a copy of "Theory of Error," written by W0JF, formerly
of the National Bureau of Standards. This was a textbook for a class I
took 40+ years ago and covers the subject quite adequately.
73,
Bob, N7XY
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