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Removed the qualifiers that the measurand is periodic. Amplitude is used for non-periodic e. g. random values too. DLJosephson 22:07, 15 October 2009 (UTC)

True, but it is largely (primarily) used for periodic functions. I have re-added that information in an altered form. --EncycloPetey 22:17, 15 October 2009 (UTC)
That looks fine. I am mostly concerned with physics and engineering rather than math. DLJosephson 22:20, 15 October 2009 (UTC)