Greetings,
I'm looking for any information on safety requirements/guidelines for
removable media loading tray mechanisms (i.e., CD-ROM). Specifically
what guidelines or requirements should be used to account for the
possibility of hair, clothing, fingers, or even a tongue (and who knows
what
Is that what you're really seeing -
a harmonic of the clock?
I developed a spreadsheet whereby I can calculate
all sorts of freqs from a product that has been
accurate enough to scare me.
If you want, supply the freqs of all clocks,
incoming/outgoing signals, and any division
being
Hello Kevin,
The heating test performed on your PCB is to verify the compliance of the
PCB usage. In some cases, the temperature on the body of non-safety
critical components must verify to determine the appropriate spacing of the
surrounding components, such as wires (rated 105) or capacitors
Hi Kevin,
I had a rather bad experience between UL and CSA in
the older days when there wasn't so much discussion
and agreement between them. I had set up an MOU
between them with UL as the test location.
Went like this ...
Switching power supply. Has a transformer.
Must do abnormals
Moshe,
We've all noticed this seeming fluctuation of signals that should be the
same. There are two reasons for it.
1. There really are fluctuating signals coming from the EUT and
2. the analyzer is doing this to an otherwise constant signal.
For the first case, the most blatant example is
Craig:
You can not expect to find solutions to all problems that may come up
during your work in the standards, you just have to use your head,
think the problem through:
1. Are there any sharp edges which could cause injury?
2. Is the force exerted by the closing
9/17/97
This is a SUMMARY OF INPUTS ON AUSTIN SYMPOSIUM
Thanks to all the people (14) who responded to my request for feedback on
the 1997 IEEE EMC Austin Symposium. Below is a summary of the recurring
comments. (Note:- These comments are also somewhat prejudiced from other
sources, particularly
Doug,
To answer your question of which is better:
The primary concern should have been the temperature of the windings
to see if the insulation (between primary and secondary?) would have
exceeded the allowable limits and thus possibly break down.
A (much lesser) secondary concern would have
Good God! What short sightedness! ;-)
Earth orbits the sun in a mere 365.242198781 days!
In the year 3000 folks will bemoan the programmers who used the
wildly inaccurate 365.2425 figure!
Thanks for the correction! I /KNEW/ someone would pop
on and
Jon,
This isn't a fair comparison. Inside the measured computer there are factors
which could influence emissions, like shielding, stray capacitance and other,
and this could be changing with temperature, vibration etc. And of course the
signal is much lower and more difficult to measure.
moshe
One of the problems on a typical PC is the software its running. If you are
running anything under Windows, then you have the randomness of the housekeeping
functions of the windows OS. Old Billionaire Billy has incorporated many
big-brother features that he won't tell us about and is the
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