12-68
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2600S-901-01 Rev. C / January 2008
Section 12: Instrument Control Library
Series 2600 System SourceMeter® Instruments Reference Manual
Example
Include source values with readings for SMU A buffer 1:
smua.nvbuffer1.collectsourcevalues = 1
smuX.nvbufferY.collecttimestamps
X = SMU channel (a or b)
Y = NV buffer (1 or 2)
Attribute
Timestamp collection for the buffer.
Usage
state = smuX.nvbufferY.collecttimestamps
-- Reads collection state.
smuX.nvbufferY.collecttimestamps = state
-- Writes collection state.
Set
state
to one of the following values:
0
Timestamp collection disabled (off).
1
Timestamp collection enabled (on).
Remarks
• Assigning a
state
value to this attribute enables or disables the storage of timestamps.
Reading this attribute returns the
state
of timestamp collection.
• When on, timestamps will be stored with readings in the buffer. This requires four extra
bytes of storage per reading. The first reading is time stamped at zero seconds.
Subsequent readings are time stamped relative to the time storage was started.
• 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
,
,
Example
Include timestamps with readings for SMU A buffer 1:
smua.nvbuffer1.collecttimestamps = 1
smuX.nvbufferY.n
X = SMU channel (a or b)
Y = NV buffer (1 or 2)
Attribute
Number of readings in the buffer.
Usage
bufferreadings = smuX.nvbufferY.n
Remarks
• Reading this attribute returns the number of readings that are stored in the buffer.
• This is a read-only attribute.
Details
See “
” in this section and in
Also see
,
,
Example
Read the number of readings stored in SMU A buffer 1:
bufferreadings = smua.nvbuffer1.n
print(bufferreadings)
Output:
1.02
The above output indicates that there are 125 readings stored in the buffer.
smuX.nvbufferY.timestampresolution
X = SMU channel (a or b)
Y = NV buffer (1 or 2)
Attribute
Timestamp resolution.
Usage
tsres = smuX.nvbufferY.timestampresolution
-- Reads collection state.
smuX.nvbufferY.timestampresolution = tsres
-- Writes collection state.
tsres
Timestamp resolution in seconds.
Remarks
• Assigning to this attribute sets the resolution for the timestamps. Reading this attribute
returns the timestamp resolution value.
• The minimum timestamp resolution is 0.000001seconds (1µs). At this resolution, the
reading buffer can store unique timestamps for up to 71 minutes. This value can be
increased for very long tests.
• When setting this value it will be rounded to an even power of 2µs.
Details
See “
” in this section and in
Also see
,
,
Example
Set the timestamp resolution for SMU A buffer 1 to 10µs:
smua.nvbuffer1.timestampresolution = 0.00001
