Keithley 2450 User Manual

Section
8: TSP command reference Model 2450 Interactive SourceMeter® Instrument
Reference Manual
8-10 2450-901-01 Rev. B/September 2013
Details
This function returns a table with statistical data about the data that was placed in the reading buffer.
The instrument automatically updates reading buffer statistics as data is added to the reading buffer. When the
reading buffer is configured to fill continuously and overwrite older data with new data, the buffer statistics
include the data that was overwritten.
The table returned from this function provides statistics at the time the function is called. Although the instrument
continues to update the statistics, the table that is returned is not updated. To get fresh statistics, call this
function again.
The statistics parameter contains the values described in the following table.
Attribute When returned Description
min
n > 0
A table that contains data about the minimum reading value that was added
to the buffer
mean
n > 0
The average of all readings added to the buffer
stddev
n > 1
The standard deviation of all readings that were added to the buffer
n
Always
The number of data points on which the statistics are based
max
n > 0
A table that contains data about the maximum reading value that was added
to the buffer
If n equals zero (0), all other values are nil. If n equals 1, stddev is nil because the standard deviation of a
sample size of 1 is undefined.
Use the following command to get statsVar; a table with the following entries in it: n, min, max, mean, and
stddev.
statsVar = buffer.getstats(bufferVar)
Use the following commands to print these entries:
print(statsVar.n)
print(statsVar.mean)
print(statsVar.stddev)
print(statsVar.min.reading)
print(statsVar.min.timestamp)
print(statsVar.max.reading)
print(statsVar.max.timestamp)
The commands that return minimum and maximum values each also return tables. These tables contain the
following values:
Attribute Description
reading
The reading value
timestamp
The min.timestamp is the timestamp of the minimum data point in the
buffer and the max.timestamp is the timestamp of the maximum data
point in the buffer

Keithley 2450 Specifications

General

Brand	Keithley
Model	2450
Category	Test Equipment
Language	English