How to plot a scaled signal from oscilloscope

Hello everyone. I am using the Tektronix oscilloscope and I want to plot the signals in real time on my computer. Tektronix has provided instructions for communicating with the scope in its programming manual, and there is also a code for acquiring data, but the data is in form of a vector, so I only get the right values of volts per division, but not the time. It shows the number of samples on the x scale, and I want it to be like on a scope - time/div. I-ve tried to change everything in the formula for data acquisition, but the only thing it changes is volt/div, because it somehow doesn't depend on time. Anybody have some idea how to get the data scaled with time? The code I used for this can be found here: TekScopeDataAcquisition

[Allen Yang]

Hi, did you successfully plot the waveforms in real-time on the computer? I tried to read waveforms from tek oscilloscope. But the refresh rate was low and I can't display the wavefroms in real-time.

Answer 1

[Andrei Ursache]

The easiest way to read a waveform from your Tektronix scope would be by using Quick-Control oscilloscope. With this approach, you would need to generate the waveform time values by using the AcquisitionTime and WaveformLength oscilloscope properties. For example, if o is your oscilloscope object:

   y1 = readWaveform(o);
   t = linspace(0, o.AcquisitionTime, o.WaveformLength);
   figure
   plot(t, y1)
   xlabel('Time (s)')
   ylabel('Voltage (V)')

You might also find the following example app useful:

https://www.mathworks.com/matlabcentral/answers/403640-is-there-an-example-app-for-reading-waveform-data-from-an-oscilloscope