Plot measured Filter data
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Hi all,
I got mearsurement data from a real band pass filter. To make a professional plot, I am using matlab. The x-axis is in logarithmic scale. While plotting the magnitude it is working perfectly. Unfortunately, it does not work for the phase. But when I plot it with libre office calc, I get the correct result. The excel file is attached. It would be great if you could give a hint. Thank you in advance!
Plot with libre office calc:
The code is as follows:
T = readtable('Plot.xls');
gain = T{(22:109),1};
frequency = T{(22:109),2};
phase = T{(22:109),3};
%plot gain
subplot(2,1,1);
semilogx(gain, frequency); %x axis has log scale
title('Bode Diagram')
xlabel('Frequency [Hz]')
ylabel('Magnitude [dB]')
%plot phase
subplot(2,1,2);
semilogx(phase, frequency); %x axis has log scale
xlabel('Frequency [Hz]')
ylabel('Phase [deg]')
grid on
采纳的回答
T = readtable('Plot.xls')
frequency = T{(22:109),1}; % change this to ffequency
gain = T{(22:109),2};
phase = T{(22:109),3};
%plot gain
subplot(2,1,1);
semilogx(frequency,gain); %x frequency as x-scale
grid
title('Bode Diagram')
xlabel('Frequency [Hz]')
ylabel('Magnitude [dB]')
%plot phase
subplot(2,1,2);
semilogx(frequency,phase); %x here too
xlabel('Frequency [Hz]')
ylabel('Phase [deg]')
grid on
2 个评论
VBBV
2022-5-20
frequency is 1st column of table. while plotting, use frequency as xscale and gain/phase as yscale.
Sebastian D.
2022-5-20
编辑：Sebastian D.
2022-5-20
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