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Old 06-12-2019, 08:18 AM   #3
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Join Date: May 2006
Location: Surrey, UK
Posts: 17,884

Ah ha - I see where I was going wrong.

I was reading "log" as "log to the base 10", but it is actually "log to the base e, or natural log". With that understood, the 2 equations yield very similar results. Here they both are in MS Excel, with a range of values:

With amplitudes of 0.50, the equations evaluate to -6.021 and -6.000 respectively, so the second equations looks the better of the two.
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