Keithley SourceMeter 2600B Series, Reference Manual

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Series 2600B System SourceMeter® Instrument Reference Manual Section 7: TSP command reference
2600BS-901-01 Rev. C / August 2016 7-197
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 will give the actual time the
measurement was acquired
Also see
smuX.buffer.recalculatestats() (on page 7-197)
smuX.buffer.recalculatestats()
This function recalculates the specified reading buffer's statistics.
Type TSP-Link accessible Affected by Where saved Default value
Function Yes
Usage
smu X .buffer.recalculatestats( bufferVar )
X Source-measure unit (SMU) channel (for example,
smua.buffer.recalculatestats() specifies SMU channel A)
bufferVar The reading buffer to process