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CHANGELOG.md

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v1.0.0 (2019-01-17):

Added:

  • Added the base class ResultTable to store, save and load tables of measurement data togther with column titles, units, and measurement parameters. The data is stored internally as a 2D numpy array and can be accessed in a dictionary-type fashion with column names as keys. Additionaly, ResultTable provides a basic plotting method using matplotlib.

Changed:

  • TrasistorSweepData and IVSweepData now inherit from ResultTable and have been significantly simplified. Formats for saving and loading the data to files have slightly changed:

    • The line with column headers is now marked as a comment and starts with '#'.
    • All given measurement parameters are saved in the file's header. Specifically, TrasistorSweepData.load() expects the parameter sweep_type to be present in the header and have one of the values: 'transfer' or 'output'.
    • Options to read and write in CSV format instead of tab-delimited columns are given.

    As a result, data files created by versions < 1.0.0 need to be modified as follows to be recoginzed:

    • Prepend '#' to the line with column titles.
    • Add the line '# sweep_type: type' to the header where type can be 'transfer', 'output', or 'iv'.

Removed:

  • clearBuffers method from Keithley2600 has been deprecated. Clear the buffers directly with buffer.clear() instead, where buffer is a keithley buffer instance such as k.smua.nvbuffer1.

v0.3.0 (2018-11-13):

Added:

  • Keithley2600 methods now accecpt Keithley2600 objects as arguments, for instance, one can now write 
    # assume we have a Keithley2600 instance 'k'
k.smua.measureiv(k.smua.nvbuffer1, k.smua.nvbuffer2)
    instead of needing to use their string representation: 
    k.smua.measureiv('smua.nvbuffer1', 'smua.nvbuffer2')
  • Keyword aruments can now be given to Keithley2600() and will be passed on to the visa resource (e.g., baud_rate=9600)

Changed:

  • Code simplifications resulting from the above.
  • k.readBuffer(buffer) no longer clears the given buffer.
  • When attempting to create a new instance of Keithley2600 with the name VISA address as an existing instance, the existing instance is returned instead.

Removed:

  • k.clearBuffers(...) now logs a deprecation warning and will be removed in v1.0. Clear the buffers directly with buffer.clear() instead.