[Amps] Bird Element Calibration?

[Bob Nielsen]

On Sun, Mar 20, 2005 at 05:32:39AM -0500, G3rzp at aol.com wrote:
>  
> In a message dated 19/03/2005 22:27:10 GMT Standard Time,  
> philc at 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