Curve Query

The easy way to download curves from an oscilloscope.

Description

The curvequery package is a collection of tools to simplify downloading waveform data from an oscilloscope. It is a layer of functionality built on top of the PyVISA package.

Usage

Creating a connection to the mixed signal oscilloscope is easy. The mso() helper function automatically sets up a connection using the pyvisa package module. The helper function returns a an Oscilloscope object with its high-level API.

>>> from curvequery import mso
>>> oscope = mso("TCPIP::192.168.1.10::INSTR")
TEKTRONIX,MSO58,Q200011,CF:91.1CT FV:1.12.5.5575

High Level API

The Oscilloscope object provides a high-level API that simplifies getting data from the oscilloscope.

>>> print(oscope.idn)
Identity(company='TEKTRONIX', model='MSO58', serial='Q200011', config='CF:91.1CT FV:1.12.5.5575')

>>> wave_collection = oscope.curve()    # download waveform data from the instrument
Downloading: 100%|█████████████████████████████████| 11/11 [00:00<00:00, 34.05Wfm/s]

>>> oscope.default_setup()              # restore the instrument's default settings

The waveform collection object returned by the curve() method contains the data downloaded from the instrument.

>>> wave_collection.sources
['CH1', 'CH2', 'CH8_D0', 'CH8_D1', 'CH8_D2', 'CH8_D3', 'CH8_D4', 'CH8_D5', 'CH8_D6', 'CH8_D7', 'MATH1']

>>> wave_collection['CH1'].data
[-0.030000000000000027, -0.030000000000000027, ... ]

In addition, the horizontal scale (x axis) and vertical scale (y axis) is also provided.

>>> wave_collection['CH1'].y_scale
YScale(top=3.51, bottom=-1.49)

>>> wave_collection['CH1'].x_scale
XScale(slope=1.6e-10, offset=-1.999845e-06, unit='s')

Low Level API

The oscilloscope object also allows for low-level interaction with the oscilloscope.

>>> oscope.write("*RST")
>>> print(oscope.query("*IDN?"))
"TEKTRONIX,MSO58,Q200011,CF:91.1CT FV:1.12.5.5575"

A pyvisa Resource Manager object can be explicitly referenced when creating an oscilloscope object.

>>> import pyvisa
>>> rm = pyvisa.ResoureManager()
>>> oscope = mso("TCPIP::192.168.1.12::INSTR", resource_manager=rm)

Future Feature Enhancements

Other potential high level features are possible...

>>> id = oscope.add("meas", source="ch1", measurement="risetime")  # potential future feature
>>> measurements = oscope.meas()                                   # potential future feature

Requirements

• Python:
  • 3.4+
• 3rd Party Modules:
  • pyvisa 1.9.1 Python VISA interface library

Installation

The curvequery package can be installed using conda or from source.

Installation using Conda

{Conda instructions are TBD}.

Installation from Source

See the Source section below for instructions on how to make a source distribution tarball. Using pip, install the package module directly from a source distribution tarball in the Windows and Linux environments. Using this method, all 3rd-party package modules will automatically be downloaded from PyPI and installed.

$ pip install curvequery-1.0.0.tar.gz

Source

The source code for curvequery is available on TBD

Creating a source distribution for later installation is easy:

$ cd {top/directory/of/the/source/tree}
$ python setup.py sdist