Tektronix KEITHLEY 2600B Series User Manual

Section 9: TSP command reference Series 2600B System SourceMeter® instrument Reference Manual
9-200 2600BS-901-01 Rev. F/August 2021
The statistics parameter has the attributes described in the following table.
Attribute
When returned
Description
n
Always
The number of data points on which the statistics are based
mean
When n > 0
The average of all readings added to the buffer
stddev
When n > 1
The standard deviation of all readings (samples) added to the buffer
min
When n > 0
A table containing data about the minimum reading value added to the buffer
max
When n > 0
A table containing data about the maximum reading value added to the buffer
If n equals zero (0), all other attributes are nil. If n equals 1, the stddev attribute is nil because
the standard deviation of a sample size of 1 is undefined.
The min and max entries each have the attributes defined in the following table.
Attribute
Description
measurefunction
String indicating the function that was measured for the reading (current, voltage,
ohms, or watts)
measurerange
The full-scale range value for the measurement range used when the measurement
was made
reading
The reading value
sourcefunction
String indicating the source function at the time of the measurement (current or
voltage)
sourceoutputstate
String indicating the state of the source (off or on)
sourcerange
Full-scale range value for the source range used when the measurement was made
sourcevalue
If bufferVar.collectsourcevalues is enabled, the sourced value in effect at
the time of the reading
status
Status value for the reading; the status value is a floating-point number that encodes
the status value into a floating-point value
timestamp
If bufferVar.collecttimestamps is enabled, the timestamp, in seconds,
between when the reading was acquired and when the first reading in the buffer was
acquired; adding this value to the base timestamp produces the actual time the
measurement was acquired
Example
reset()
smua.nvbuffer1.clear()
smua.measure.count = 10
smua.measure.v(smua.nvbuffer1)
stats = smua.buffer.getstats(smua.nvbuffer1)
print("n= "..stats.n)
print("mean= "..stats.mean)
print("stddev= "..stats.stddev)
print("min= "..stats.min.reading)
print("max= "..stats.max.reading)
Make measurements and store them in nvbuffer1. Print the statistics for the data.
Example output:
n= 10
mean= -2.3851394871599e-05
stddev= 4.406545187484e-07
min= -2.4557113647461e-05
max= -2.322196996829e-05
Also see
smuX.buffer.recalculatestats() (on page 9-201)

Tektronix KEITHLEY 2600B Series Specifications

General

Brand	Tektronix
Model	KEITHLEY 2600B Series
Category	Measuring Instruments
Language	English