Updated version using Python 3.9 and latest PyVisa and NumPy
The code is updated with more function and robust interaction with the scope.
To use you should update to latest pyvisa (py -m pip install pyvisa)
Install latest numpy in same manner
Download PyDSA from the repo and off you go!
*Changelog Rossi, KK1L January & July 2021
- Python 3.9 update...syntax, call format changes, functions
- More robust scope communication
- On screen progress feedback
- Warning if scope is not triggered (used to crash)
- Warning if input signal is clipping at scope
- Can read from channel 1 or channel 2
- Peak detect information and marker on waveform
- Added autoscaling
- Scaling change and offset works for all waves on the screen
- Can store up to 7 waveforms on the screen
- Most actions can be done while acquiring
- Added clear function which removes all waves and resets averaging/max-hold
- Scale is accurate in dBm after calibration *Previously the absolute level was arbitrary, but relatively accurate *"Calibrate" is manual operation to adjust peak for a known dBm value *Use a sine wave of known magnitude and adjust the calibration factor for the right reading Note: It is on my list to make this automatic.
- Added autocalibration. Use a known amplitude sine wave and autocal will match to the dBm you enter
What follows is from the original README.md
Spectrum Analyzer for the Rigol DS1000 series digital scopes
RF Spectrum Analyzer in Python. This is a modified version of PA2OHH's audio spectrum analyzer:
http://www.qsl.net/pa2ohh/11sa.htm
It uses National Instruments VISA driver to download samples from the scope, perform FFTs and show the results. I used the PyVISA 1.4 wrapper:
http://pyvisa.readthedocs.org/en/latest/getting_nivisa.html
Written for Python 2.7 under Windows 7, not tested in other environments
Dependencies:
PyVISA 1.4
math
numpy
Tkinter
Changelog:
9-20-2015 - first release
TODO:
-blows up with some combinations of FFT size, averaging and padding - looks like an array indexing bug
-there are a lot of spurs in the spectrum. May be possible to fix in software but I think this is a limitation of the scope itself
Notes:
9-30-2015 - tried to make it work with PyVISA 1.8 but the interface has changed a lot and it broke LONG scope buffer mode. Went back to PyVISA 1.4
Jan 31 2016 - included DS1054Z patch by Marcus and a full version for the DS1054Z by Kerr Smith
Also included is Rigol_view, a short Python script which grabs the sample buffer and shells to wfm_view to show the results. wfm_view shows the same spurs in the spectrum.
wfm_view can be found at:
http://meteleskublesku.cz/wfm_view/
project blog: rheslip.blogspot.com
Kerr Smith provided these step by step installation instructions:
I first installed the latest National Instruments VISA runtime:
http://www.ni.com/download/ni-visa-run-time-engine-15.0/5379/en/NIVISA1500runtime.exe
Next I installed Python 2.7 making sure Python was added to the path (this is so you can run python from the command line from any directory):
https://www.python.org/downloads/release/python-2711/python-2.7.11.amd64.msi
Next I updated pip and setuptools as well as installing wheel as recommend on: http://python-packaging-user-guide.readthedocs.org/en/latest/installing/#install-pip-setuptools-and-wheel python -m pip install -U pip setuptools pip install wheel
I now updated mock as I could not get any further due to an error (on next step) saying 'Requires setuptools >=17.1 to install properly', the following fixed this issue and seemed to update a couple of other things as well:
pip install mock
Next I installed pyvisa version 1.4 as recommend (the mock update above made this work):
pip install pyvisa==1.4
Next I installed numpy, this initially did not work and showed this 'error: Unable to find vcvarsall.bat', so I installed the Microsoft Visual C++ Compiler for Python 2.7:
https://www.microsoft.com/en-gb/download/details.aspx?id=44266 VCForPython27.msi
Now numpy installed, it took a while as it needed to compile and there was no real progress update so I just left it and after a few minutes it finished and said it had installed.
pip install numpy
Next I downloaded the PyDSA code from Github:
https://github.com/rheslip/PyDSA
The file to run is in the PyDSA directory and is called PyDSA.py