Buffer Statistics; Minimum And Maximum; Peak-To-Peak; Average - Keithley 2500 User Manual

8-4 Data Store

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

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.

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.
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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.
X is a stored reading.
i
n is the number of stored readings.
y =
X is a stored reading.
i
n is the number of stored readings.
Models 2500 and 2502 User's Manual
n
∑
X
i
i = 1
y = ---------------
n
2
n n
   
∑ ∑
1
2
   
– -- -
X X
i
i
 n   
i = n 1 – = 1
i
---------------------------------------------------------------
n 1 –