Barry,
I believe Ross is right for the last and larger half (LARGER half??
{poetic license}) of a lightning strike. As I understand the current
lightning model the initial strike is a positive Leader coming from the
cloud to the ground. The Leader is a thin column of air that has been
Yes,
Not only will the LISN have poor performance above 100 MHz, but the
CISPR voltage probe or a down and dirty series capacitance will have
trouble at these frequencies, although they will all work well at lower
frequencies. Many of the other suggestions from members on this subject can
Cameron,
If you are looking for a measure of the conducted RF coming off the
board the standard AC LISN works for DC power as well. The voltage probe
per CISPR 16 will also work and gives a standardized impedance that can be
probed from point to point (or if you are looking for a down and
Don,
In the EU guidance document for the EMC directive that they published
in July of 1997 they differentiate between apparatus that is simply
repaired, and apparatus that is repaired / refurbished to as new condition.
The latter falls under the EMC directive and standards in effect at the
Group,
I concur that 61000-6-2 is a generic standard and as such calls out
actual test requirements. The point that Mr. Sterner rightly made however
is that many of the product families call out for multiple test times at a
particular voltage reduction. While I can't say for certain why
Donald,
Both setups have two 50 ohm terminations -- The measuring device at
the EUT end and a 50 ohm terminator at the AE end. The CDN or direct method
also has two 150 to 50 ohm matching networks at each end to match the 150
ohm characteristic impedance of the CDN to the 50 ohm
Antonio,
The answer is that power is 180% greater (100% in the carrier, 40% in
the USB, and 40% in the LSB). Voltage (RMS) is the square root of 180%
(1.8) greater or 134% or 4.02 VRMS.
This value may not have much practical sense except as a rough
indicator of proper operation since
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