How do I view .trc files?

Question

Tor-Arne Forsmo 2017-5-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/339931-how-do-i-view-trc-files

评论： Walter Roberson 2021-10-15

Hi. It's been a while since I've used matlab. I have some graphs in .trc files and I've been given a function that is supposed to be able to plot these files, but I'm having a hard time figuring out how it's done. Here's the function:

https://pastebin.com/CDvk2GK4

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Walter Roberson 2017-5-12

在 MATLAB Online 中打开

Code is:

function ExamplePlotImpedances(code,no)
% function ExamplePlotImpedances(src)
%
% Example program
% Load and plot a group of impedance measurements from HP8753, 
% saved as S11-parameters
% From functions written in LabVIEW at HBV-IMST
Zref = 50;                             % Ohm   Reference impedance
%-- Build fileames --
Nf = length(no);
for k=1:Nf
    src{k}= sprintf('%s%04d.trc', code, no(k));
end
for k=1:Nf
    %--- Load raw data ---    
    trc(k)= readtrace(src{k});
      %--- Create frequency vector, calculate Z, and plot impedance  ---
      f{k}= [0:trc.Np-1]*trc.dx+trc.x0;      % Hz   Frequency vector
  end
      S11{k} = double(trc.y(:,1)+ 1i*trc.y(:,2));
      Z = Zref* (1+S11{k})./(1-S11{k});         % Ohm  Complex impdance
  end
  keyboard
  subplot(2,2,1)
  semilogy(f,abs(Z));
  xlabel('Frequency [Hz]')
  ylabel('Impedance magnitude [Ohm]')
  grid on
subplot(2,2,3)
phi = angle(Z);
plot(f,rad2deg(phi));
xlabel('Frequency [Hz]')
ylabel('Phase [deg]')
ylim([-90 90])
set(gca, 'ytick', [-90:30:90])
grid on
subplot(2,2,2)
plot(f, real(Z), 'b-', f, imag(Z), 'r-');
xlabel('Frequency [Hz]')
ylabel('Impedance [Ohm]')
grid on
subplot(2,2,4)
plot(f, real(S11), 'b-', f, imag(S11), 'r-');
xlabel('Frequency [Hz]')r
ylabel('S11')
ylim([-1 1])
grid on
keyboard
return