LabView Interface for Quantum Design Physical
Properties Measurement System (PPMS)
These VIs are shareware. If you find them useful, please make
a voluntary contribution ($15 suggested donation) to the Amherst College Physics
Department. The funds will be used to support undergraduate research and entertainment
(e.g. pizza). Please send your check to
Amherst College Physics Department
P.O. Box 5000
Amherst, MA 01002-5000
Right-click and choose "save link as..." to download
the entire PPMS VI library (1
MB) or choose from the individual VIs by clicking on one of these categories:
Main PPMS Controller
This is a collection of VIs written by Brian
Lyons '05 during the summer of 2003 funded by a Mellon Academic Internship
Grant and a grant from the Research Corporation. They primarily serve as wrappers
for GPIB commands used to control the PPMS unit, but are helpful if your data
collection is being done with LabView and you do not wish to use low-level GPIB
to communicate with the instrument or the MultiVu software is causing errors.
They have been tested and extensively used on our own PPMS system, but are by
no means guaranteed to be free of errors.
These were written with LabView 6i and so may not open or work properly in
earlier versions of LabView.
CAUTION: These VIs behave poorly if run simultaneously with the software
that came with the PPMS unit, MultiVu. Usually either MultiVu will report an
error, LabView will crash, or both. This is because both programs are talking
to the PPMS unit across the GPIB bus simultaneously. Therefore, we recommend
that you exit MultiVu before running any of these VIs.
These VIs require that the GPIB bus be present and initialized properly.
The nomenclature follows these guidelines:
- VIs that change a physical property have the word "set" followed
by the property to be changed. For example: "PPMS set temp.vi" sets
the temperature in the chamber.
- VIs that report back a numerical reading of the state of the PPMS unit contain
only the name of the characteristic. For example: "PPMS field.vi"
reports the magnetic field in the sample chamber.
- VIs that report the status(changing, stable, error) of some physical property
have the name of the property followed by the word "status". For
example: "PPMS chamber status.vi" reports back whether the chamber
is sealed, pumping continuously, purging, etc.
- VIs that report the current value to which a property is set have the name
of the property followed by the words "set point". For example,
"PPMS position set point.vi" reports the current position set point.
To download a VI right-click it and choose "save target as..."
Main PPMS Controller
- PPMS controller.vi - a VI that
pulls all the other VIs into a single front panel. This is an adequate replacement
for the MultiVu software when performing simple tasks like changing the temperature
and field or installing a sample or putting the unit into standby. This VI
requires every other VI in the library and is contained in it.
- empty sweep.vi
- This is a template which you can use to build VIs that sweep through
a range of temperatures, magnetic fields, or positions.
- This is an empty VI format of the template above. This is required by
the controller VI.
- PPMS wait for stable
temp.vi - a VI that will wait up to a certain amount of time for the temperature
- PPMS shutdown.vi - used to put
the PPMS into standby mode.
- PPMS install sample.vi
- initiates the procedure that prepares the sample chamber to be opened.
- temp calibration.vi - a VI that
can be used to calibrate new thermometers, thermistors, etc. Note that this
VI requires both resistivity VIs and all the temperature VIs in addition to
the VI listed below.
- PPMS resistivty initialize.vi
- VI that sets the current and power limits for the bridge channels. This
must be done before a bridge channel can be used for measurements.