G_M
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Posts posted by G_M
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Hello everyone,
i'll really appreciate any suggestion to fix this issue with Matlab DAQ Adaptator and the DT9857E while trying to generate and acquire signals.
Thanks for your reply!
Galvani
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Hi everyone,
i'm Galvani from the department of mechanic at the technical university of Berlin, interested in vibration theory and machines dynamics. Getting started with MCC Products, i hope this forum will help me to improve.
Best!
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Hello,
i'm trying to generate and acquire signals for a study using a DT9857E box, so i wrote a short code(using matlab and the DAQ Toolbox) to test wether the result could be satisfying or not. The code is written this way:
clear all, clc, close all
s = daq("dt");
fAbtast = 50e3;
s.Rate = fAbtast; %1000;
BoxName = 'DT9857E-16(00)';
addoutput(s,BoxName, '0', 'Voltage');
addinput(s,BoxName,'0', 'Voltage');fIn = 1e3;
t = 0:1/fAbtast:1-1/fAbtast;
x = sin(2*pi*fIn*t);Output_data = x'*1.2;
Input_data = readwrite(s, Output_data);
figure
time_vec = seconds(Input_data.Time);
plot(time_vec, Output_data)
hold on
plot(time_vec, Input_data.Variables)
hold off
grid on
legend(["Output Signal","Acquired Signal"])The result looks this way.
Any Idea on why the acquired signal does look that way? Since i just connected an output channel to an input channel, the same output signal or at least likely was expected to be acquired.
I even try to reproduce the example in the following matlab documentation: Simultaneously Acquire Data and Generate Signals - MATLAB & Simulink - MathWorks Deutschland
but the result did not look great :
%% Example from Matlab's documentation
% A session has been already defined
output = cos(linspace(0,2*pi,1000)');data1 = readwrite(s, output);
figure
plot(output);
hold on
plot(data1.Variables);
ylabel("Voltage (V)")
%title("Acquired Signal");
legend(["Output Data","Acquired Signal"])below is an enlarged view of the acquired signal
Any suggestion to fix this will be greatly appreciated.
Thanks for your reply :)
I also attached a matlab file with the code if one may want to reproduce these results.
Generate and acquire data with DT9857E
in Measurement Computing (MCC)
Posted
Hello Fausto,
thank you for replying. So i'll have to revert to DT Open Layers v 7.8.2 to fix this issue.
Thanks a lot
Best regards,
Galvani