Products > Test Equipment
First picture on EEVblog of the new R&S MXO4 series oscilloscope :)
shabaz:
Hi,
Thanks! For the signals, Matlab was used to create some of them (and then stored them in the MXO 4), it directly accepts CSV format waveform files, provided there is a 43-line header (which can be copy-pasted from any waveform saved from the MXO itself). The 10 MHz signal was from an AD9954 chip (it was a custom PCB, but there are some ready-made modules on AliExpress, although I have not tried them).
For the audio signals, it was using a cheap ADAU1401 DSP board (from AliExpress), the details are on GitHub. It is a low-cost way to create all sorts of tones/filters etc, all controlled from a Pi. (It could be done using a sound card and Matlab but I was planning to use the DSP chip for a standalone speech processor eventually, and be able to instruct it to notch out up to several tones simultaneously, and adjust bandwidth etc). The chip doesn't have a lot of processing power, there are better DSP modules on AliExpress, although they need a separate ADC/DAC (that is built-in to the ADAU1401 chip).
mawyatt:
@ shabaz. Nice video, and good selection of the waveforms to demo the new MXO4, well done :-+
Very impressive display of the MXO4 SA type capabilities. The log frequency scale and speed of the performed Fourier Transform (not sure if it's an FFT or CZT) are very nice indeed.
Wish we could afford one!!
Best
pdenisowski:
--- Quote from: shabaz on August 12, 2023, 12:39:46 pm ---Thanks! For the signals, Matlab was used to create some of them (and then stored them in the MXO 4), it directly accepts CSV format waveform files, provided there is a 43-line header (which can be copy-pasted from any waveform saved from the MXO itself). The 10 MHz signal was from an AD9954 chip (it was a custom PCB, but there are some ready-made modules on AliExpress, although I have not tried them).
For the audio signals, it was using a cheap ADAU1401 DSP board (from AliExpress), the details are on GitHub. It is a low-cost way to create all sorts of tones/filters etc, all controlled from a Pi. (It could be done using a sound card and Matlab but I was planning to use the DSP chip for a standalone speech processor eventually, and be able to instruct it to notch out up to several tones simultaneously, and adjust bandwidth etc). The chip doesn't have a lot of processing power, there are better DSP modules on AliExpress, although they need a separate ADC/DAC (that is built-in to the ADAU1401 chip).
--- End quote ---
Wow ... just wow. Very impressed.
maxwell3e10:
Can the units of vertical scale be changed to V/sqrt(Hz) and plotted on log scale? Can the spectrum be averaged and then saved to a data file or to a reference spectrum?
shabaz:
Hi,
It supports a total of four options for the vertical scale (one is linear, in Volts, the rest are log power and voltage). The spectrum can be averaged, and the averaged spectrum can be saved to a data file, and to a reference spectrum. The data file format is CSV, possible to decode for instance with Python (see the spectrum_tool.py read_csv function on line 46), including all the spectrum analyzer settings (including resolution bandwidth, window type setting, etc).
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