2600S-901-01 Rev. C / January 2008
Return to
12-67
Series 2600 System SourceMeter® Instruments Reference Manual
Section 12: Instrument Control Library
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 “
” in this section and in
Also see
,
,
Example
Read the timestamp for the first reading stored in buffer 1 of SMU A:
basetime = smua.nvbuffer1.basetimestamp
print(basetime)
Output:
2.03
The above output indicates that the timestamp is 2369.9 seconds.
smuX.nvbufferY.capacity
X = SMU channel (a or b)
Y = NV buffer (1 or 2)
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 “
” in this section and in
Also see
,
,
Example
Read the capacity of SMU A buffer 1:
capacity = smua.nvbuffer1.capacity
print(capacity)
Output:
1.05
smuX.nvbufferY.clear
X = SMU channel (a or b)
Y = NV buffer (1 or 2)
Function
Clears the buffer.
Usage
smuX.nvbufferY.clear()
Remarks
This function clears all readings from the indicated buffer.
Details
See “
” in this section and in
Also see
,
,
Example
Clears SMU A buffer 1:
smua.nvbuffer1.clear()
smuX.nvbufferY.collectsourcevalues
X = SMU channel (a or b)
Y = NV buffer (1 or 2)
Attribute
Source value collection for the buffer.
Usage
state = smuX.nvbufferY.collectsourcevalues
-- Reads collection state.
smuX.nvbufferY.collectsourcevalues = state
-- Writes collection state.
Set
state
to one of the following values:
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
function.
Details
See “
” in this section and in
Also see
,
,
