I read in sci.electronics.design that Larry Brasfield donotspam_larry_b
wrote (in )
about 'Say what you mean.', on Fri, 25 Feb 2005:

If I wanted to speak of an impedance inside of some circuit, I might
loosely speak of it as "internal", but in any useful discussion, it
would be spoken of as either an output impedance or an input impedance,

The problem is that people say 'output impedance' when they mean 'load
impedance'. To prevent misunderstanding I use the term 'output source
impedance'.

There are also some people who use 'input impedance' when they mean
'source impedance'. I don't talk to them. (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk