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Section 3: Functions and features
Model 2657A High Power System SourceMeter® Instrument Reference Manual
3-16
2657A-901-01 Rev. B/December 2012
Buffer status
The buffer reading status attribute includes the status information as a numeric value; see the
following table for values. For example, to access status information for the second element of SMU
buffer 1, use the following command:
stat_info = smua.nvbuffer1.statuses[2]
Buffer status bits
Bit Name
Hex
value
Description
B0
FastADC
0x01
Fast ADC was used to make the reading
B1
Overtemp
0x02
Over temperature condition
B2
AutoRangeMeas
0x04
Measure range was autoranged
B3
AutoRangeSrc
0x08
Source range was autoranged
B4
4Wire
0x10
4-wire (remote) sense mode enabled
B5
Rel
0x20
Rel applied to reading
B6
Compliance
0x40
Source function in compliance
B7 Filtered
0x80 Reading
was
filtered
Dynamic reading buffers
Reading buffers can also be allocated dynamically. Dynamic reading buffers are created and
allocated with the
smua.makebuffer(
n
)
command, where
n
is the number of readings the buffer
can store. For example, the following command allocates a reading buffer named
mybuffer
that can
store 100 readings:
mybuffer = smua.makebuffer(100)
Allocated reading buffers can be deleted as follows:
mybuffer = nil
Dynamically allocated reading buffers can be used interchangeably with the
smua.nvbuffer
Y
buffers that are described in
Dedicated reading buffer designations
(on page 3-10).
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