Keithley 2651A Reference Manual page 120

Model 2651A High Power System SourceMeter® Instrument Reference Manual
Buffer read-only attributes
The following table contains buffer read-only attributes.
Buffer read-only attributes: Read-only attributes used to access buffer parameters
Storage attribute
basetimestamp
capacity
n
next
Buffer storage control programming examples
The programming examples below illustrate the use of buffer storage control attributes.
Buffer control programming examples:
Provides control examples for channel A, buffer 1
Command
smua.nvbuffer1.collectsourcevalues = 1
smua.nvbuffer1.appendmode = 1
smua.nvbuffer1.collecttimestamps = 0
smua.nvbuffer1.timestampresolution =
0.001
smua.nvbuffer1.fillcount = 50
smua.nvbuffer1.fillmode = 0
Buffer read-only attribute programming examples
The follow programming examples illustrate use of buffer read-only attributes.
Buffer read-only attribute programming examples:
Provides read-only attribute programming examples
Command
number = smua.nvbuffer1.n
buffer_size = smua.nvbuffer1.capacity
2651A-901-01 Rev. A / March 2011
Description
The timestamp of when the reading at rb[1] was stored, in seconds from
midnight January 1, 1970 GMT. See
additional details.
The total number of readings that can be stored in the reading buffer.
The number of readings in the reading buffer.
This attribute indicates where the next element that will be added to the reading
buffer will be stored.
Section 3: Functions and features
Time and date values (on page 7-4) for
Description
Enable source value storage
Enable buffer append mode
Disable timestamp storage
Set timestamp resolution to 0.001024 s
Set 50 as the number of readings the
buffer will take before restarting at index
1.
Set the reading buffer to fill once (do not
overwrite old data).
Description
Request the number of readings in the
buffer
Request buffer size
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