On Mon, 01 Nov 2004 09:27:55 +0000 (GMT), Jim Lesurf
wrote:

In article , Don Pearce
wrote:


The ultimate resolution of all these systems is infinite given
sufficient averaging time.

Not quite. :-) As Ian's postings brought out, this assumes the signal
pattern is spread across the observed/integrated period. In practice, what
matters is having a duration that captures the desired signal energy and
gives the optimum signal/noise energy.

Also, there is a formal snag w.r.t. 1/f noise whose effect may 'blow up' as
we proceed to infinite time. ;-)

However in this context, both the above points are just an academic
exercise in quibbling. ;-

Slainte,

Jim

Ta! We must be kept honest in these matters...

d
Pearce Consulting
http://www.pearce.uk.com