matlab contradiction ?

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Eng.Salwa1

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Hello everyone.
I have got a signal using digital oscilloscope from the mains 230V.
I plotted the data: time vs volt using matlab and i got it. However, when i tried to plot the same data using From my space in simulink I got different shape and its not even a wave form
I had two parameters in my workspave which are time and volt and then i used
ts = timeseries(volt,time); to get the two parameters in one matrix
please have a look at the two waveforms from plotting tool in matlab and from scope of simulink


the original wave form maximum amplitude is 0.8 Volt and the neasuring time -2.5 to 2.5 a total of 5 seconds
I have zoomed in to get a better clarity.

Regrads.
 

Your diagram at right appears to be a small portion of a sinewave, namely the part where it crosses zero and goes into the negative region. Did you set it to zoom in on that narrow timeframe?
 

BradtheRad said:
Your diagram at right appears to be a small portion of a sinewave, namely the part where it crosses zero and goes into the negative region. Did you set it to zoom in on that narrow timeframe?
Click to expand...

No i havent. This is what i thought so ,,tried to zoom in ,,nothing changed
 

Do you see more of the waveform when you zoom out? I think that's what you should try.

Experiment with running time so it's long enough to see a few sinewaves?
 

Eng.Salwa1 said:
please have a look at the two waveforms from plotting tool in matlab and from scope of simulink

the original wave form maximum amplitude is 0.8 Volt and the neasuring time -2.5 to 2.5 a total of 5 seconds
Click to expand...
Show simulink model. If you expect sine wave form, then simulink is the problem.

time from -2.5 to 2.5 ? How comes that ?
 

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