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function spectrum_analyzer = E4440a_take_data(varargin)
% This script reads data from E440a spectrum analyzer and saves it to a file
% E4440a_take_data( data_save_flag, data_plot_flag, channels_to_grab_flag, data_save_path, data_file_prefix )
% channels_to_grab_flag - is boolean array with true/false for the particular channel
% for example channels_to_grab_flag = [ false true true ] will grab only traces 2 and 3
%
% Eugeniy E. Mikhailov eemikh@wm.edu
% Gleb Romanov gromanov@hellok.org
% 8/12/2015 linux friendly and use of lab file utils
% 7/27/2015 added a choice to save only specific channels
% 7/20/2015 added a choice for saving and plotting
% 6/20/2013
%% some sane defaults
nVarargs = length(varargin);
if (nVarargs > 5 )
error ('wrong number of arguments');
end
if (nVarargs < 5 )
data_file_prefix = 'S';
else
data_file_prefix = varargin{5};
end
if (nVarargs < 4 )
data_path = 'Z:\qol_comp_data\data\';
% do not worry it will convert Z: to proper path in linux
else
data_path = varargin{4};
end
if (nVarargs < 3 )
channels_to_grab_flag = [ true, true, true]; % grab all channels
else
channels_to_grab_flag = varargin{3};
end
if (nVarargs < 2 )
data_plot_flag = true; % Default to plot Data
else
data_plot_flag = varargin{2};
end
if (nVarargs < 1 )
data_save_flag = true; % Default to save data
else
data_save_flag = varargin{1};
end
%% Windows computer parameters
if ispc
% Define instrument parameters
board_index = 0;
gpib_address = 21;
bufSize = 100000;
%% Find and initialize instrument
obj1 = instrfind('Type', 'gpib', 'BoardIndex', board_index, 'PrimaryAddress', gpib_address, 'Tag', '');
% alternatively
% obj1 = instrfind('Type', 'visa-gpib', 'RsrcName', 'GPIB0::21::INSTR', '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;
%% Connect to instrument object, obj1.
fopen(obj1);
end
%% Unix specific parameters
if isunix
obj1=lgpib('Agilent_E4405b')
end
%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...');
%% Find number of points
Npoints_string = query(obj1, ':SENSe:SWEep:POINts?');
Npoints = sscanf(Npoints_string, '%f');
%Npoints=4695;
tr1 = NaN(Npoints,1); % refill traces with NaN
tr2 = NaN(Npoints,1);
tr3 = NaN(Npoints,1);
%% Read traces
% switch to ASCII trace transfer
fwrite(obj1, ':FORMAT:TRACE:DATA ASCII');
if channels_to_grab_flag(1);
tr1_string = query(obj1, ':TRACE:DATA? TRACE1;'); % select traces to grab
end
if channels_to_grab_flag(2);
tr2_string = query(obj1, ':TRACE:DATA? TRACE2;');
end
if channels_to_grab_flag(3);
tr3_string = query(obj1, ':TRACE:DATA? TRACE3;');
end
%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.
if ispc
% windows needs to close the file
fclose(obj1);
end
%disp('Spectrum Analyzer data communincation is done');
%% Convert the grabbed traces from strings into vectors
if channels_to_grab_flag(1);
tr1 = sscanf(tr1_string, '%f,');
end
if channels_to_grab_flag(2);
tr2 = sscanf(tr2_string, '%f,');
end
if channels_to_grab_flag(3);
tr3 = sscanf(tr3_string, '%f,');
end
% 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');
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_file_prefix, data_path );
% Write the data to a file
%disp(' ');
disp(horzcat('Saving data to ',save_to_file));
header = { ...
horzcat(datestr(clock)) ...
, horzcat('Device:', ' ', device_string) ...
, horzcat('Frequency center, Hz', ' ', freq_center_string) ...
, horzcat('Frequency span, Hz', ' ', freq_span_string) ...
, horzcat('Frequency start, Hz', ' ', freq_start_string) ...
, horzcat('Frequency stop, Hz', ' ', freq_stop_string) ...
, horzcat('Amplitude units ', amplitude_units_string) ...
, horzcat('Attenuation ', attenuation_string) ...
, horzcat('Reference level ', ref_level_string) ...
, horzcat('Log scale ', log_scale_string) ...
, horzcat('Resolution bandwidth, Hz', ' ', rbw_string) ...
, horzcat('Video bandwidth, Hz', ' ', vbw_string) ...
, horzcat('Sweep time, seconds', ' ', sweep_time_string) ...
, horzcat('Columns are : freq tr1 tr2 tr3') ...
};
% preparing data in column wise fashion
data = [freq; tr1; tr2; tr3];
data = data'; % now data is column wise
save_table_with_header(save_to_file, data, header, '%');
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
if (data_plot_flag)
%% Plot raw traces
%
% Open a window
figure111 = figure(111);
% Create plot
plot(freq/1e6, tr1, 'Color', [1 0 0], 'DisplayName', 'Trace 1'); hold on
plot(freq/1e6, tr2, 'Color', [0 0 0], 'DisplayName', 'Trace 2');
plot(freq/1e6, tr3, 'Color', [0 0 1], 'DisplayName', 'Trace 3'); hold off
xlabel('Detection frequency, MHz','FontSize',14);
ylabel('Noise power, dBm','FontSize',14);
% Show legend
legend('show');
grid on;
end
%drawnow;
%% Finish up and cleanup
% Close all opened files
fclose('all');
% Bring focus back to the command window
%commandwindow;
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