[volt-nuts] 7061 statistics , dont understand

[Fabio Eboli]

Hello, after bulding the cables as per previous post,
and trying to test them, I'm having a problem understanding
7061 statistics calculations.
Maybe it's some simple thing happening,but I cannot understand.
I set up the meter in program mode, statistics, output=standard
deviation, 7 digits filter off.
Soon the meter started showing strange numbers, too high for me.
So I cleared the history file and repeated the measures with few
points and after tried calculating the values also by hand.

13 Samples (comma as decimal divider):

9,999964
9,999961
9,999961
9,999961
9,999962
9,999958
9,99996
9,99996
9,999964
9,999962
9,99996
9,999958
9,999958

meter's calculated values:
mean=9,999961
variance=5,587935E-008
SD=2,363881E-004

hand calculated values:
mean=9,9999606923
variance=4,064E-012
SD=2,016E-006

What's happening?

Fabio.

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