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Section 7: Command reference
Model 2651A High Power System SourceMeter® Instrument Reference Manual
7-206
2651A-901-01 Rev. A / March 2011
Usage
reading
= smu
X
.measure.
Y()
reading
= smu
X
.measure.
Y(readingBuffer)
iReading
,
vReading
= smu
X
.measure.iv()
iReading
,
vReading
= smu
X
.measure.iv(
iReadingBuffer
)
iReading, vReading
= smu
X
.measure.iv(
iReadingBuffer
,
vReadingBuffer
)
reading
Returned value of the last (or only) reading of the measurement process
X
Source-measure unit (SMU) channel (for example,
smua.measure.v()
applies to
SMU channel A)
Y
SMU measurement function (
v
= voltage,
i
= current,
r
= resistance,
p
= power)
readingBuffer
A reading buffer object where all readings will be stored
iReading
The last reading of the current measurement process
vReading
The last reading of the voltage measurement process.
iReadingBuffer
A reading buffer object where current readings will be stored.
vReadingBuffer
A reading buffer object where voltage readings will be stored.
Details
This function (without specifying a reading buffer) will only make one measurement and return that measurement
as
reading
. To use the additional information acquired while making a measurement or to return multiple
readings, specify a reading buffer. If the instrument is configured to return multiple readings for a measurement
and
readingBuffer
is specified, all readings will be available in
readingBuffer
, but only the last
measurement will be returned as
reading
.
Measurements are in the following units of measure:
v
= volts,
i
= amperes,
r
= ohms,
p
= watts.
The
smu
X
.measure.iv()
function returns the last actual current measurement and voltage measurement as
iReading
and
vReading
, respectively. Additionally, it can store current and voltage readings if buffers are
provided (
iReadingBuffer
and
vReadingBuffer
).
The
smu
X
.measure.count
attribute determines how many measurements are performed. When using a
reading buffer, it also determines the number of readings to store in the buffer. If a reading buffer is not specified,
the SMU will ignore the
smu
X
.measure.count
attribute and only make one measurement.
The
readingBuffer
will be cleared before taking any measurements unless the buffer is configured to append
data.
Example
smua.measure.count = 10
smua.measure.v(smua.nvbuffer1)
Performs ten voltage measurements using SMU
channel A and stores them in a buffer.
Also see
(on page 7-194)
(on page 7-201)
(see "Reading buffers" on page 3-6)