[Amps] Bird Element Calibration?

[G3rzp@aol.com]

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.....
 
 
73
 
Peter G3RZP