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‎examples/PicoVNA_DUT_PassFail_Testing_Example.m‎

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%% PicoVNA Pass-Fail Testing Example
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%
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% This is an example of a Pass/Fail test using the PicoVNA. This compares a
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% S21 log magnitude sweep from a device to the same measurement of a
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% previously measured Golden DUT using the |PicoVNA_GoldenDUT_Example.m| file.
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%
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% To run this example session, type the name of the file,
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% |PicoVNA_DUT_PassFail_Testing_Example|, in the MATLAB Command Window.
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%
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% The file, |PicoVNA_DUT_PassFail_Testing_Example.m| must be on your MATLAB
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% Path. For additional information on setting your MATLAB path, see
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% <matlab:doc('addpath') addpath>.
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%
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% Additionally you must have the |.cal| file for your device and the
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% |GoldenDUT.mat| file in the current folder.
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%
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% *Example:*
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% PicoVNA_DUT_PassFail_Testing_Example;
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%
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% *Description:*
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% Demonstrates how to use the VNA to compare DUTs to a saved Golden DUT
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% and evaluate if the DUT is within tolerance of the Golden DUT
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% measurement.
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%
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% *Copyright:* © 2017-2018 Pico Technology Ltd. See LICENSE file for terms.
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%% Clear workspace, command window and close figures
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clear;
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clc;
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close all;
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%% Connect to VNA
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picoVNACOMObj = connectVNA;
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%% Load calibration
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% Load a calibration and settings file.
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% This needs to be generated and saved using the PicoVNA2 software.
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%
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% Replace |DefCal.cal| with the correct calibration for your device, |Pico TD
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% demo with limits [Serial#].cal|.
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picoVNACOMObj.LoadCal('DefCal.cal');
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%% Load Golden DUT log magnitude
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% Load in the reference data from the Golden Dut captured using
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% <PicoVNA_GoldenDUT_Example.html |PicoVNA_GoldenDUT_Example|>
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load('GoldenDUT.mat');
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%% Create pass band
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% Create a pass band using the Golden DUT data and the tolererance in dB of
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% the testing for comparison with the DUTs later.
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tolerance = 0.2; % Tolerance of the cable in dB
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% Create the upper and lower bounds of the pass band.
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Error.Upper = Golden.S12LogMag + tolerance;
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Error.Lower = Golden.S12LogMag - tolerance;
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%% Testing
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% Create a stop button for ending testing.
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[stopFig.f, stopFig.h] = stopButtonVNA(50, 200, 1000, 500);
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flag = 1; % Use flag variable to indicate if stop button has been clicked (0)
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setappdata(gcf, 'run', flag);
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stopbutton = gcf;
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% Create the axes for plotting the test measurements on with the pass band
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% displayed.
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ax1 = subplot(1,1,1);
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plot(ax1,Golden.Frequency,Error.Upper,'k');
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hold on
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plot(ax1,Golden.Frequency,Error.Lower,'k');
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hold off
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xlabel('Frequency (Hz)');
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ylabel('Magnitude');
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title('Test Limits');
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%%
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n = 0; % Number of Loops
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go = 1; % While loop condition (1 = run, 0 = stop)
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while go == 1
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% Run test on mouse click on the figure
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k = waitforbuttonpress;
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% Check if stop button has been pressed
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flag = getappdata(stopbutton, 'run');
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if flag == 0
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go = 0;
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end
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if k == 0
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n = n+1
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% Make measurement of the DUT
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picoVNACOMObj.Measure('ALL');
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% Collect the S21 Log Magnitude data from the VNA
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[test.frequency, test.logmag] = getBlockDataVNA(picoVNACOMObj,'S21','logmag');
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% Compare the test data with the pass band limits at every point
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for i = 1:length(test.logmag)
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if (test.logmag(1,i) >= Error.Upper(1,i)) || (test.logmag(1,i) <= Error.Lower(1,i))
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test.Check = 1; % Set Check to 1 if the point is outside of the pass band
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else
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test.Check = 0; % Set Check to 0 if the point is inside of the pass band
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end
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end
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% Inspect Check to see if any point failed the tolerance testing and
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% record whether the test was a pass or a fail.
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% If the DUT passed the test it is assigned a 1, if it failed it is
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% assigned a 0.
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if sum(test.Check) == 0
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pass(n,1) = 1;
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else
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pass(n,1) = 0;
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end
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% Plot the Test Results
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plot(ax1,Golden.Frequency,Error.Upper,'k');
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hold on
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plot(ax1,Golden.Frequency,Error.Lower,'k');
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% The test data is plotted in green with "Test Passed" title if
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% pass = 1 for the DUT
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if pass(n,1) == 1
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plot(ax1,test.frequency,test.logmag,'g');
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title('Test Passed');
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% The test data is plotted in red with "Test Failed" title if pass = 0
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% for the DUT
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else
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plot(ax1,test.frequency,test.logmag,'r');
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title(['Test Failed']);
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end
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xlabel('Frequency (Hz)');
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ylabel('Magnitude');
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drawnow
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hold off
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disp('Test Complete')
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end
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end
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%% Disconnect VNA
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disconnectVNA(picoVNACOMObj)
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close PicoVNA
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clear ans ax1 flag go i k n picoVNACOMObj

‎examples/PicoVNA_GoldenDUT_Example.m‎

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%% Pico VNA Golden DUT Data Collection Example
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%
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% This is an example of Golden DUT data aquisition using the PicoVNA. This
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% makes a measurement of the Golden DUT and retrieves the S21 log magnitude
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% data from the VNA ready for use in the
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% <PicoVNA_DUT_PassFail_testing_Example.html |PicoVNA_DUT_PassFail_Testing_Example|>.
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%
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% To run this example session, type the name of the file,
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% |PicoVNA_GoldenDUT_Example|, in the MATLAB Command Window.
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%
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% The file, |PicoVNA_GoldenDUT_Example.m| must be on your MATLAB Path. For
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% additional information on setting your MATLAB path, see
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% <matlab:doc('addpath') addpath>.
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%
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% Additionally you must have the |.cal| file for your device in the current
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% folder.
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%
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% *Example:*
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% PicoVNA_GoldenDUT_Example;
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%
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% *Description:*
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% Demonstrates how to use the VNA to collect and save data for a Golden
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% DUT for use in the PicoVNA_DUT_PassFail_Example.m script.
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%
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% *Copyright:* © 2017-2018 Pico Technology Ltd. See LICENSE file for terms.
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%% Clear workspace, command window and close figures
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clear;
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clc;
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close all;
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%% Connect to VNA
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picoVNACOMObj = connectVNA;
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%% Load calibration
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% Load a calibration and settings file.
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% This needs to be generated and saved using the PicoVNA 2 software.
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%
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% Replace |DefCal.cal| with the correct calibration for your device, |Pico TD
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% demo with limits [Serial#].cal|.
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picoVNACOMObj.LoadCal('DefCal.cal');
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%% Measure Golden DUT
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% Make measurement of the Golden DUT and retrieve the log magnitude data
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% for the S21 parameter.
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picoVNACOMObj.Measure('ALL');
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[Golden.Frequency, Golden.S12LogMag] = getBlockDataVNA(picoVNACOMObj,'S21','logmag');
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%% Save Golden DUT Data
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% Save the Golden DUT data read for use in the <PicoVNA_DUT_PassFail_Testing_example.html Pass/Fail Testing Example>.
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save ('GoldenDUT.mat', 'Golden');
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%% Disconnect VNA
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disconnectVNA(picoVNACOMObj);
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disp('Complete');

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