In message <[email protected]>,
dated Wed, 31 Oct 2012, "ce-test, qualified testing bv - Gert Gremmen"
<[email protected]> writes:
Had a 200 Watt power supply last week that simply shut-off (fold back)
at 10V/m . It was applied in a laboratory equipment for creating
expensive bio-cultures for vaccination ... These cultures may cost up
to a million dollar. This was not a cheap unknown manufacturer, but one
With a quality system implemented. Design update without re-test ?
Maybe it had an obscure fault. One of the interesting cases I had some
years ago was an all-analogue hi-fi preamplifier which was radiating at
17 MHz. One section of a quad op-amp, used for producing a stable DC
level, was faulty. If it had been in the signal chain, the fault would
have been discovered. But you don't test analogue audio preamps for
high-frequency emissions!
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
The longer it takes to make a point, the more obtuse it proves to be.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-
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