Model 2651A High Power System SourceMeter® Instrument Reference Manual
Section 3: Functions and features
2651A-901-01 Rev. A / March 2011
3-13
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
Description
basetimestamp
The timestamp of when the reading at
rb[1]
was stored, in seconds from
midnight January 1, 1970 GMT. See
additional details.
capacity
The total number of readings that can be stored in the reading buffer.
n
The number of readings in the reading buffer.
next
This attribute indicates where the next element that will be added to the reading
buffer will be stored.
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
Description
smua.nvbuffer1.collectsourcevalues = 1
Enable source value storage
smua.nvbuffer1.appendmode = 1
Enable buffer append mode
smua.nvbuffer1.collecttimestamps = 0
Disable timestamp storage
smua.nvbuffer1.timestampresolution =
0.001
Set timestamp resolution to 0.001024 s
smua.nvbuffer1.fillcount = 50
Set 50 as the number of readings the
buffer will take before restarting at index
1.
smua.nvbuffer1.fillmode = 0
Set the reading buffer to fill once (do not
overwrite old data).
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
Description
number = smua.nvbuffer1.n
Request the number of readings in the
buffer
buffer_size = smua.nvbuffer1.capacity
Request buffer size
