Configuring And Running Sweeps - Keithley 2657A Reference Manual

Section 3: Functions and features

Configuring and running sweeps

Use the following topics to configure and run a sweep.
Configuring compliance limits remotely
Voltage and current limits can be configured using the smuX.trigger.source.limitY attribute,
which sets the sweep source limits. For example, to set the SMU A sweep limit to 100 V, execute:
smua.trigger.source.limitv = 100
Configuring end sweep actions remotely
Use the end sweep action to configure the source action at the end of the sweep. The
source-measure unit (SMU) can be programmed to return to the idle source level or hold the last
value of the sweep. Configure the end sweep action by setting the
smuX.trigger.endsweep.action attribute. For example, execute the following command to
configure SMU A to return the source to the idle source level at the end of a sweep:
smua.trigger.endsweep.action = smua.SOURCE_IDLE
Configuring measurements during a sweep
Measurements can be performed during a sweep using the smuX.trigger.measure.Y()
function. When sweeps are run, measurements are stored in the specified reading buffer for later
recall. You can specify which reading buffer will store the readings. For example, to store the voltage
readings taken during the sweep:
smua.trigger.measure.v(vbuffername)
smua.trigger.measure.action = smua.ENABLE
To recall sweep data:
•
Using the front panel: Press the RECALL key, and then select DATA or STATISTICS. For
DATA: select the buffer, and then choose reading numbers to display using the navigation wheel
or cursor keys. For STATISTICS: select the buffer, and then choose MEAN, STD DEV,
SAMPLE SIZE, MINIMUM, MAXIMUM, or PK-PK to display using the navigation wheel
cursor keys. Recalling readings from the reading buffer using the front panel can only be done if
one of the dedicated reading buffers is used to store the sweep data.
•
Remote: Use the printbuffer() function to request buffer readings.
See Reading buffers
Source and measurement delays
Whenever the source-measure unit (SMU) outputs a source value in a sweep, it also applies the
programmed source delay. The default source delay is zero (0) seconds. Set an additional source
delay using the smuX.source.delay attribute.
Whenever the SMU performs a measurement in a sweep, it also applies any configured
measurement delays. Use the smuX.measure.delay attribute to program a specific measurement
delay. The default measurement delay varies by measure range.
3-28
Model 2657A High Power System SourceMeter® Instrument Reference Manual
(on page 3-6) for details about recalling data from the buffer.
2657A-901-01 Rev. B/December 2012
or