Keithley 2601 Reference Manual page 327

Series 2600 System SourceMeter® Instruments Reference Manual
Remarks • Reading this attribute returns the timestamp (in seconds) for the first reading (rb[1])
stored in a buffer. The timestamp is based on the number of seconds from power-up that
the measurement was performed and stored.
• This is a read-only attribute.
Details See "Reading
Also see smuX.measure.overlappedY, smuX.measure.Y,
Example Read the timestamp for the first reading stored in buffer 1 of SMU A:
basetime = smua.nvbuffer1.basetimestamp
print(basetime)
Output:
2.369900+03
The above output indicates that the timestamp is 2369.9 seconds.
smuX.nvbufferY.capacity
Attribute Capacity of the buffer.
Usage
capacity = smuX.nvbufferY.capacity
Remarks • Reading this attribute returns the number of readings that can be stored in the buffer.
• A buffer with only basic collection items turned on can store over 100,000 readings.
Capacity does not change as readings fill the buffer. Turning on additional collection
items, such as timestamps and source values, decreases the capacity of the buffer.
• This is a read-only attribute.
Details See "Reading
Also see smuX.measure.overlappedY, smuX.measure.Y,
Read the capacity of SMU A buffer 1:
Example
capacity = smua.nvbuffer1.capacity
print(capacity)
Output:
1.123410+05
smuX.nvbufferY.clear
Function Clears the buffer.
Usage
smuX.nvbufferY.clear()
Remarks This function clears all readings from the indicated buffer.
Details See "Reading
Also see smuX.measure.overlappedY, smuX.measure.Y,
Example Clears SMU A buffer 1:
smua.nvbuffer1.clear()
smuX.nvbufferY.collectsourcevalues
Attribute Source value collection for the buffer.
Usage state = smuX.nvbufferY.collectsourcevalues
smuX.nvbufferY.collectsourcevalues = state
Set
state
0 Source value collection disabled (off).
1 Source value collection enabled (on).
Remarks • Assigning a state value to this attribute enables or disables the storage of source
values. Reading this attribute returns the state of source value collection.
• When on, source values will be stored with readings in the buffer. This requires four extra
bytes of storage per reading.
• This value, off or on, can only be changed when the buffer is empty. The buffer can be
emptied using the
Details See "Reading
Also see smuX.measure.overlappedY, smuX.measure.Y,
2600S-901-01 Rev. C / January 2008
buffers" in this section and in
X = SMU channel (a or b)
Y = NV buffer (1 or 2)
buffers" in this section and in
X = SMU channel (a or b)
Y = NV buffer (1 or 2)
buffers" in this section and in
X = SMU channel (a or b)
Y = NV buffer (1 or 2)
to one of the following values:
smuX.nvbufferY.clear
buffers" in this section and in
Return to Section Topics
Section 7.
smuX.nvbufferY
Section 7.
smuX.nvbufferY
Section 7.
smuX.nvbufferY
-- Reads collection state.
-- Writes collection state.
function.
Section 7.
smuX.nvbufferY
Section 12: Instrument Control Library
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