Rigol DS1102E – Python

Rigol_USBTMC

A simple PyUSBTMC-based interface for the Rigol DS1102E Oscilloscope.

Source

https://github.com/AIMAtlanta/Rigol_USBTMC

Overview and Installation

This module provides a simple to use python interface developed specifically for the Rigol DS1102E. The chief feature of this module is that it wraps the oscilloscope interface in a class, automatically identifies the oscilloscope upon instantiation, and simplifies calls made by PyUSBTMC to methods of that class.

This module is based on PyUSB, and so in turn on libusb. Because of this foundation, this utility may be used on both Linux and Windows platforms with relative ease. On linux, the standard current branch of the libusb project may be used (e.g. install with, sudo apt-get install libusb-1.0-0.) On Windows, a 32-bit build of version 0.1 has been ported, allowing Windows users to make use of the utility offered by PyUSB.

This utility makes use of the PyUSB and PyUSBTMC modules. (These are imported by slightly different names than their names in pip: PyUSB (version 1.0.0b2 as of this document) is installed withpip install pyusb but imported by import usb; PyUSBTMC (version 0.1dev15 as of this document) is installed with pip install pyusbtmc but is imported by import usbtmc.)

This project has been developed to support the automated interaction of the Rigol DS1102E and the Hantek 1025G DDS function generator, and as such (as of 20150419), not all interfaces ofered by the Rigol 1102 have been implemented in this module. While other Rigol Oscilloscope models are likely to be supported to varying degrees, such support has neither been designed or verified.

This module was developed using Python 3.4.

Basic usage

The rigol_usbtmc.py module must be on your python path. This can be accomplished either by having the module in your working directory, or by adding the directory containing the module to your python path using the sys module:

import sys
sys.path.append('/path/to/module/directory')

Instantiation:

import rigol_usbtmc
scope = rigol_usbtmc.Scope()

Measurement:

Sampling frequency is specified for the entire device, while voltage sampling is specified per channel. The channels are instances of Channel classes, named ch1 and ch2, belonging to the Scopeinstance.

# Specify a specific sampling frequency and voltage levels
scope.timescale = 0.001  # seconds per division
scope.ch1.verticalGain = 1  # Volts per division
scope.ch1.verticalOffset = 0  # Offset in volts

# or have the oscilloscope automatically detect the appropriate sampling parameters
scope.ch1.auto()

# Make a measurement
scope.ch1.meas_Vpp()  # Measure the peak to peak voltage

Implemented measurement methods:

  • meas_Vpp()
  • meas_Vmax()
  • meas_Vmin()
  • meas_Vamp()
  • meas_Vtop()
  • meas_Vbase()
  • meas_Vavg()
  • meas_Vrms()
  • meas_over()
  • meas_pre()
  • meas_freq()
  • meas_rise()
  • meas_fall()
  • meas_period()
  • meas_posWidth()
  • meas_negWidth()
  • meas_posDuty()
  • meas_negDuty()
  • meas_posDelay()
  • meas_negDelay()

License

The MIT License (MIT)

Copyright (c) 2015, Atlanta Instrumentation and Measurement, LLC

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Author

Kevin D. Nielson (2015.04.19)

AIM – Atlanta Instrumentation and Measurement, LLC