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Section 8: Buffer (data store) Model 6517B Electrometer Reference Manual

8-8 6517B-901-01 Rev. C / August 2015

 MAX: maximum reading in buffer, for example:

MAX=+1.635968e+00 at RDG# +00090

Notes:

 Display response may be slow due to calculation of statistics for large buffers

 Exponents are in terms of primary units of function on top line (for example, volts, not

millivolts)

 MIN: minimum reading in buffer, for example:

MIN=+1.627611e+00 at RDG# +00012

 Average: This math operation displays the mean value of the buffered readings, for example:

Average = +1.6345e+00

The equation used to calculate the mean is:

Where: x

is a stored reading, and n is the number of stored readings Note that if n = 0,

the result is NAN (not a number).

 StdDev: This operation displays the standard deviation of the stored readings, for example:

StdDev = 1.4944e-03

The equation used to calculate the standard deviation is:

Where: x

is a stored reading, and n is the number of stored readings.

Note that if n1, the result is NAN (not a number). These statistics are invalid if the measurement

function changed during data store (for example, when scanning different functions). The Model

6517B uses IEEE-754 floating point format for math calculations.

The last display in this series allows you to send the buffered readings to a printer.

Keithley 6517B Reference Manual

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