TC 1 controls the IEC IEV. There you find in the fundamental
definitions
Area Electrical and magnetic devices / Operating
conditions and testing
IEV ref 151-16-33
thermal equilibrium
state reached when the temperature of the parts of
a component or equipment operating in a given environment no
longer varies faster than a specified limit
I remember when thermally testing CRT colour TVs that it
took about 3 hours before the temperature stabilised. In
this case, a fair bit of the power loss was power switching,
which increased with the microclimate temperature. In part,
it was more like a test for thermal runaway, with some of
the TO-3 packaged transistors stabilising at about 130
degree C case temperature in a 40 degree C room ambient
(Athens Valley in the summer I was told).
I was involved with a variant of the TC 1 data base. You had
to enter the data as HTML expressions in an Excel
spreadsheet - a frustrating exercise if you were not
proficient in HTML.
Mick
On 12/01/2012 11:24, John Woodgate wrote:
In message <4f0eba2a.8070...@ieee.org>, dated Thu, 12 Jan
2012, Mick Maytum <m.j.may...@ieee.org> writes:
Nice to see a harmonised approach from the various IEC TCs
The 60034 definition might be taken as more 'horizontal'
(i.e. a reference definition that other committees should
adopt) than the others.
May years ago, someone I know proposed to IEC that
standard definitions and other widely-used wording should
be held in a database from which product committees should
select what they want. It wasn't progressed - it was
probably a bit before its time, but it is quite
practicable now.
Might take 100 years to agree on all the definitions,
though. Can't be left to TC1 in isolation.
-
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