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function spectrum_analyzer = E4440a_take_data(data_save_flag, data_plot_flag)
% This script reads data from E440a spectrum analyzer and saves it to a file
%
% Eugeniy E. Mikhailov eemikh@wm.edu
% Gleb Romanov gromanov@hellok.org
% 6/20/2013
% 7/20/2015 added a choice for saving and plotting
%% some sane defaults
switch (nargin)
case 0
data_plot_flag = true;
data_save_flag = true;
case 1
data_plot_flag = true;
case 2
% we are good, nothing to do
otherwise
warning('Mora arguments than needed are provided');
data_plot_flag = true;
data_save_flag = true;
end
%% Define instrument parameters
board_index = 0;
gpib_address = 21;
bufSize = 100000;
%% Data file parameters
data_prefix = 'S';
data_path = 'Z:\qol_comp_data\data\';
run_number_file = 'Z:\qol_comp_data\data\autofile\runnum.dat';
%% Find and initialize instrument
%obj1 = instrfind('Type', 'gpib', 'BoardIndex', board_index, 'PrimaryAddress', gpib_address, 'Tag', '');
% Create the GPIB object if it does not exist
% otherwise use the object that was found.
%if isempty(obj1)
%obj1 = gpib('NI', board_index, gpib_address);
%else
%fclose(obj1);
%obj1 = obj1(1);
%end
% Adjust the buffers so the traces fit.
% Do this before fopen(obj1);
%obj1.InputBufferSize = bufSize;
%obj1.OutputBufferSize = bufSize;
obj1=lgpib('SAagilent')
%% Connect to instrument object, obj1.
%fopen(obj1);
disp('--------------------')
device_string = query(obj1, '*IDN?');
disp(horzcat('Connected to ', device_string));
% Communicating with instrument object, obj1.
%
% You can send commands using:
% fprintf(obj1, '_command_');
%
% Or read stuff using:
% _data_ = query(obj1, '_command_');
disp('Reading traces...');
%% Read traces
tr1_string = query(obj1, ':TRACE:DATA? TRACE1;');
tr2_string = query(obj1, ':TRACE:DATA? TRACE2;');
tr3_string = query(obj1, ':TRACE:DATA? TRACE3;');
disp('Reading Spectrum Analyzer parameters...');
%% Read various spectrum analyzer parameters
freq_start_string = query(obj1, ':SENSE:FREQUENCY:START?');
freq_stop_string = query(obj1, ':SENSE:FREQUENCY:STOP?');
freq_center_string = query(obj1, ':SENSE:FREQUENCY:CENTER?');
freq_span_string = query(obj1, ':SENSE:FREQUENCY:SPAN?');
amplitude_units_string = query(obj1, ':UNIT:POWER?');
attenuation_string = query(obj1, ':SENSE:POWER:RF:ATTenuation?');
ref_level_string = query(obj1, ':DISPLAY:WINDOW:TRACE:Y:SCALE:RLEVEL?');
log_scale_string = query(obj1, ':DISPlAY:WINDOW:TRACE:Y:SCALE:PDIVISION?');
rbw_string = query(obj1, 'SENSE:BANDWIDTH:RESOLUTION?');
vbw_string = query(obj1, 'SENSE:BANDWIDTH:VIDEO?');
sweep_time_string = query(obj1, ':SENSE:SWEEP:TIME?');
%% Disconnect from instrument object, obj1.
%fclose(obj1);
disp('Spectrum Analyzer data communincation is done');
%% Convert the traces from strings into vectors
tr1 = sscanf(tr1_string, '%f,');
tr2 = sscanf(tr2_string, '%f,');
tr3 = sscanf(tr3_string, '%f,');
% Transpose the vectors
tr1 = tr1';
tr2 = tr2';
tr3 = tr3';
% Create the frequency vector
freq_start = sscanf(freq_start_string, '%f');
freq_stop = sscanf(freq_stop_string, '%f');
Npoints = length(tr1);
freq = linspace(freq_start,freq_stop, Npoints);
% Create spectrum analyzer structure
spectrum_analyzer.traces=[tr1',tr2', tr3'];
spectrum_analyzer.freq=freq';
spectrum_analyzer.RBW=sscanf(rbw_string, '%f');
spectrum_analyzer.VBW=sscanf(vbw_string, '%f');
spectrum_analyzer.sweep_time=sscanf(sweep_time_string, '%f');
%% Save data to a file
if (data_save_flag)
% Get full path of the file to save
save_to_file = qol_get_next_data_file( data_prefix, data_path, run_number_file );
%
% Write the data to a file
disp(' ');
disp(horzcat('Saving data to ',save_to_file));
save_to_file_handle = fopen(save_to_file,'wt');
fprintf(save_to_file_handle,'%s',horzcat('# ', datestr(clock)));
fprintf(save_to_file_handle,'\n');
fprintf(save_to_file_handle,'%s',horzcat('# Device:', ' ', device_string));
fprintf(save_to_file_handle,'%s',horzcat('# Frequency center, Hz', ' ', freq_center_string));
fprintf(save_to_file_handle,'%s',horzcat('# Frequency span, Hz', ' ', freq_span_string));
fprintf(save_to_file_handle,'%s',horzcat('# Frequency start, Hz', ' ', freq_start_string));
fprintf(save_to_file_handle,'%s',horzcat('# Frequency stop, Hz', ' ', freq_stop_string));
fprintf(save_to_file_handle,'%s',horzcat('# Amplitude units ', amplitude_units_string));
fprintf(save_to_file_handle,'%s',horzcat('# Attenuation ', attenuation_string));
fprintf(save_to_file_handle,'%s',horzcat('# Reference level ', ref_level_string));
fprintf(save_to_file_handle,'%s',horzcat('# Log scale ', log_scale_string));
fprintf(save_to_file_handle,'%s',horzcat('# Resolution bandwidth, Hz', ' ', rbw_string));
fprintf(save_to_file_handle,'%s',horzcat('# Video bandwidth, Hz', ' ', vbw_string));
fprintf(save_to_file_handle,'%s',horzcat('# Sweep time, seconds', ' ', sweep_time_string));
% saving traces data
data = [freq; tr1; tr2; tr3];
fprintf(save_to_file_handle,'%f\t%f\t%f\t%f\n',data);
% Close the file
fclose(save_to_file_handle);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
if (data_plot_flag)
%% Plot raw traces
%
% Open a window
figure111 = figure(111);
%close(figure111);
%figure1 = figure(111);
%
% Create axes
axes1 = axes('Parent',figure111,'YGrid','on','XGrid','on','FontSize',14);
box(axes1,'on');
hold(axes1,'all');
%ylim([-2,12])
%ylim([-85,-70])
%
% Create plot
plot(freq/1e6,tr1,'Color',[1 0 0],'Parent',axes1,'DisplayName','Trace 1')
plot(freq/1e6,tr2,'Color',[0 0 0],'Parent',axes1,'DisplayName','Trace 2')
plot(freq/1e6,tr3,'Color',[0 0 1],'Parent',axes1,'DisplayName','Trace 3')
%
% Create xlabel
xlabel('Detection frequency, MHz','FontSize',14);
%
% Create ylabel
ylabel('Noise power, dBm','FontSize',14);
%
% Show legend
legend('show');
grid on;
%% Plot processed traces
% Open a window
figure222 = figure(222);
close(figure222);
figure222 = figure(222);
%
% Create axes
axes2 = axes('Parent',figure222,'YGrid','on','XGrid','on','FontSize',14);
box(axes2,'on');
hold(axes2,'all');
%ylim([-2,12])
%ylim([-85,-70])
%
% Create plot
plot(freq/1e6,tr1-tr1,'Color',[0 0 0],'Parent',axes2,'DisplayName','Zero')
plot(freq/1e6,tr2-tr1,'Color',[1 0 0],'Parent',axes2,'DisplayName','Tr2 - Tr1')
plot(freq/1e6,tr3-tr1,'Color',[0 0 1],'Parent',axes2,'DisplayName','Tr3 - Tr1')
%
% Create xlabel
xlabel('Detection frequency, MHz','FontSize',14);
%
% Create ylabel
ylabel('Noise power, dB','FontSize',14);
%
% Show legend
legend('show');
end
%drawnow;
%% Finish up and cleanup
% Close all opened files
fclose('all');
% Bring focus back to the command window
%commandwindow;
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