Buffer statistics
• MIN and MAX provides the minimum and maximum readings stored in the buffer. It
also indicates the buffer location of these readings.
• The Peak-to-Peak reading is the absolute value of the difference between the MAX and
MIN readings. It is calculated as follows:
Peak-to-Peak = |MAX - MIN|
• Average is the mean of the buffer readings. Mean is calculated as follows:
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 2182 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 =
6-4 Buffer
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