Keithley System SourceMeter 2601B, Reference Manual

Page: 553 / 864

Series 2600B System SourceMeter® Instrument Reference Manual Section 7: TSP command reference
2600BS-901-01 Rev. B / May 2013 7-213
smuX.measure.Y()
This function makes one or more measurements.
Type TSP-Link accessible Affected by Where saved Default value
Function Yes
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
If you use this function without specifying a reading buffer, it makes one measurement and returns that
measurement as
reading
. To use the additional information that is 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 are available in
readingBuffer
, but only the last
measurement is 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 ignores the
smu X .measure.count
attribute and only makes one measurement.
The
readingBuffer
is cleared before making 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.