[TCML] Tesla Coil Computer Interference
dave_p at comcast.net
Tue Jul 27 00:58:57 MDT 2010
...measuring 'stuff' going back down the power line...
In a previous life, the official way of doing this
involved a split ferrite core device, called an
'absorption clamp', lots of trick calibration,
expensive. Basically: a 'sophisticated current
probe'. (There are international standards for
what PCs, etc can 'push back into the line'.
Much Lower than Tesla Coiling is likely to
I've no idea what is used for such now. Measuring
this 'sort of thing' as noted, takes a lot of
experiment, understanding, and not trusting the
test equipment without thought.
...as to trashing PCs, etc...
There are standards (also) for what 'line oddities'
a PC 'should' withstand. Tesla Coil Strays,
conducted and radiated are WAY LARGER than 'the
usual spec'. Separate, circuits, added filtering,
both 'source' and 'victim', unplugging are
indicated. PC PSU's are almost always 'sort of on':
unplugging is the safest...
...RF surges...test primaries...
I would gently suggest that ANYTIME the spark gap
is active, RF is floating around. If the design
primary/secondary/wotever is not present, the
spark gap will HAPPILY resonate the stray lead
lengths. This gets into 'handwaving': Yes, the
resistive lamp load will damp the oscillations,
BUT. Yes the powers involved can be substantial,
so even small portions can confuse PC's etc. One
might recall that Hertz 'discovered' 'RF' with
resonating wire lines and spark gap transmitters
AND A SPARK GAP AS A RECEIVER...
AS the voltages and frequencies go up, things are
ALWAYS grounded. (OK: omit airplanes, satellites..
8)>>). In a 'normal 'lab'': either explicit
grounds are provided OR the RF couples capacitively,
or thru unplanned spark gaps, to 'something' on its
way to ground. (Don't Ask about the Tesla Coil,
the ethernet noise immunity demo, the FORGOTTEN
GROUND Connection and the expensive network analyzer.
New dwp: dave_p at comcast.net
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