User manual

Buffer statistics
The MAX AT and MIN AT values are the maximum and minimum values in the buffer. The
AVERAGE value is the mean of the buffered readings. The equation used to calculate the
mean is:
where: x
i
is a stored reading
n is the number of stored readings
The STD DEV value is the standard deviation of the buffered readings. The equation used
to calculate the standard deviation is:
where: x
i
is a stored reading
n is the number of stored readings
NOTE The Model 2000 uses IEEE-754 floating point format for math calculations.
y
X
i
i1=
n
∑
n
-----------------=
X
2
i
i1=
n
∑
1
n
---X
i
i1=
n
∑
⎝⎠
⎜⎟
⎜⎟
⎛⎞
2
⎝⎠
⎜⎟
⎜⎟
⎛⎞
–
n-1
--------------------------------------------------------------
y =
2000-900 (J - Aug 2010) BOOK.fm Page 19 Wednesday, October 12, 2011 12:29 PM