Buffer Multiple Displays - Keithley 2001 Operator's Manual

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Continuous sequence
Action
STORE
ENTER
RECALL
EXIT
RECALL
EXIT
EXIT
3.8.4

Buffer multiple displays

Math operations performed on buffered readings are
available when readings are recalled. Just press NEXT
DISPLAY to view the math operation on the bottom line of
front panel display, in the following order:
1. MAX  maximum reading in buffer, for example:
MAX=+1.635968e+00 at RDG# +00090
Notes:
C. Display response may be slow due to calculation of
statistics for large buffers.
D. Exponents are in terms of primary units of function
on top line (i.e., volts, not millivolts).
2. MIN  minimum reading in buffer, for example:
MIN=+1.627611e+00 at RDG# +00012
3. AVG  This math operation displays the mean value of
the buffered readings, for example:
AVG=+1.6345e+00
The equation used to calculate the mean is:
y
where: x is a stored reading, and
i
n is the number of stored readings.
2001-900-01 Rev. K/ August 2010
Result
STORE 00100 READINGS
Storing reading #xx of 100
100 rdgs stored; continuous ON
Rdg#+00000 @Time=+003.903546 sec
...
100 rdgs stored; continuous ON
Rdg#+00000 @Time=+067.709331 sec
...
100 rdgs stored; continuous ON
STORAGE INTERRUPTED
Acquired 100 of 100 readings
(normal reading display)
n

X
i
=
=
i 1
-------------- -
n
Annunciator
(* on)
(* off)
Note: If n = 0, the result is NAN (not a number).
4. SDEV  This operation displays the standard deviation
of the stored readings, for example:
SDEV=1.4944e-03
The equation used to calculate the standard deviation is:
n

y =
i=1
--------------------------------------------- -
where: x is a stored reading, and
i
n is the number of stored readings.
Note: If n ð 1, the result is NAN (not a number).
These statistics are invalid if the measure-
ment function changed during data store
(e.g., when scanning different functions).
The Model 2001 uses IEEE-754 floating
point format for math calculations.
The last display in this series allows you to dump the buff-
ered readings to a printer. See
on configuring printers.
Front Panel Operation
2
   
n
   
1
2 
-- -
X - X
   
i i
n
   
i=1
n-1
NOTE
NOTE
paragraph 3.12.2 for details
3-85