8-4 Data Store Models 2500 and 2502 User’s Manual
Buffer statistics
With the data store in the recall mode, buffer statistics are displayed by using the DIS-
PLAY TOGGLE key. Use the DISPLAY TOGGLE key to sequence through the statistics
and return the Model 2500 to the normal data store recall state. Pressing EXIT at any time
returns the instrument to the normal display state.
NOTE Statistics calculations will be performed on the presently selected function
(MSR1, MSR2, RATIO, or DELTA). You can display these different functions
while the statistics mode is active by pressing the appropriate function key. For
example, if V/I readings are displayed on MSR1, all buffer statistics displayed
are based on those readings.
Minimum and maximum
This mode displays the minimum and maximum readings stored in the buffer. The buffer
location number and timestamp are also provided for these readings. If desired, you can go
to those buffer locations to obtain more data about the readings.
Peak-to-peak
This mode displays the peak-to-peak reading (peak-to-peak = Maximum - Minimum).
Average
The average mode displays the mean (average) of all measured readings stored in the
buffer. The following equation is used to calculate mean:
where: y is the average.
X
i
is a stored reading.
n is the number of stored readings.
Standard deviation
This mode displays the standard deviation of buffered readings. The following equation is
used to calculate standard deviation:
where: y is the average.
X
i
is a stored reading.
n is the number of stored readings.
y
X
i
i1=
n
∑
n
---------------=
y
X
i
2
in1–=
n
∑
1
n
---
X
i
i 1=
n
∑
2
–
n 1–
---------------------------------------------------------------=
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