Galilea wrote:
Secondly, yes, I mean to say the signal has a DC component. I would have
thought that impulsive noise, being cause by electron movement would produce
an AC signal, otherwise where does the DC come from?.

The DC is the result of your 2-4 uS sampling window. Make
your sampling window one second long and see what you get.

For instance, if you sample a 250 kHz signal for 2 uS and
if you happen to hit it at a zero-crossing going positive,
you will read the DC RMS value of the wave, having sampled
only 1/2 cycle.
--
73, Cecil http://www.qsl.net/w5dxp


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