While RIGOL oscilloscopes offer great value for money there seems to be a great lack of tools to read RIGOL oscilloscopes waveform (WFM) files.
Based on the protocol extracted by the wfm_view project this project implements a feature complete WFM reader library.
The library has been tested with RIGOL DS1052E but should also work with other oscilloscopes.
Additionally a small example application wfmutil.py is included which provides
- Header extraction
- Export to CSV, identical to the internal CSV export of the scope. Just faster.
- Interactive plotting of the waveform, including a FFT.
- Extract all trigger information
- Support for alternate trigger and different time bases
- Correct treatment of time and voltage shifts
If you run into problems while parsing your waveform, please open an issue.
% python wfmutil.py info foo.wfm
General
=======
Alternate trigger : True
Cur. selected channel : CH1
Channel CH1
===========
Enabled : 1
Samplerate : 2.500e+08 Samples/s
No. of recorded samples : 524288
Y inverted : 0
Time delay : 0.000e+00 s
Y shift : -8.320e-02 V
Y grid scale : 2.000e-01 V/div
Probe attenuation : 1.0
Time grid scale : 2.000e-08 s/div
Channel CH1 Trigger
-------------------
Edge direction : RISE
Coupling : DC
Holdoff : 5.000e-07 s
Source : CH1
Mode : Edge
Level : 9.600e-01 V
Sweep : Auto
Sensitivity : 3.800e-01 V
Channel CH2
===========
Enabled : 1
Samplerate : 2.000e+07 Samples/s
No. of recorded samples : 524288
Y inverted : 0
Time delay : 0.000e+00 s
Y shift : -2.000e-01 V
Y grid scale : 1.000e+00 V/div
Probe attenuation : 10.0
Time grid scale : 1.000e-03 s/div
Channel CH2 Trigger
-------------------
Coupling : DC
Slope lower level : 0.000e+00 V
Slope type : RISE >
Holdoff : 5.000e-07 s
Source : CH2
Slope slope : 1.040e+06 V/s
Mode : Slope
Level : 1.040e+00 V
Slope width : 1.000e-06 s
Sweep : Auto
Sensitivity : 3.800e-01 V
% python wfmutil.py csv foo.wfm | head
X(CH1),CH1,X(CH2),CH2,
Second,Volt,Second,Volt,
-1.04858e-03,-6.03e-01,-1.31072e-02,-3.64e+00,
-1.04857e-03,-6.03e-01,-1.31071e-02,-3.64e+00,
-1.04857e-03,-6.03e-01,-1.31071e-02,-3.64e+00,
-1.04856e-03,-6.03e-01,-1.31070e-02,-3.64e+00,
-1.04856e-03,-6.03e-01,-1.31070e-02,-3.64e+00,
-1.04856e-03,-6.03e-01,-1.31069e-02,-3.64e+00,
-1.04855e-03,-6.03e-01,-1.31069e-02,-3.64e+00,
-1.04855e-03,-6.03e-01,-1.31068e-02,-3.64e+00,
Note, that this example uses two time bases via alternate trigger. Because of this there are two time bases in this CSV export. The exported file is identical to the files generated by the scope itself.
Copyright (c) 2013, Matthias Blaicher
All rights reserved.
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