Different Results in measurement seconds apart

[lvogl]

I wanted to do a basic function check with the Discovery 2 and with help of a Matlab script generate a sine wave and then read that wave with the ociloscope. 

The Matlab code used is the same as given in the tutorial: Acquiring and Generating Data at the Same Time with Digilent Analog Discovery 

daqlist("digilent")

dq = daq("digilent")

addoutput(dq, "AD1", "1", "Voltage");
addoutput(dq, "AD1", "2", "Voltage");
ch_out = dq.Channels(1:2);
ch_out(1).Name = "AD1_1_out";
ch_out(2).Name = "AD1_2_out"

addinput(dq, "AD1", "1", "Voltage");
addinput(dq, "AD1", "2", "Voltage");
ch_in = dq.Channels(3:4);
ch_in(1).Name = "AD1_1_in";
ch_in(2).Name = "AD1_2_in"

rate = 300e3;
dq.Rate = rate;

f = 10;
totalduration = 0.5;
n = totalduration * rate;
t = (1:n)/rate;
output = sin(2*pi*f*t)';

[data, startTime] = readwrite(dq, [output output]);

plot(data.Time, data.AD1_1_in, data.Time, data.AD1_2_in);

xlabel('Time (s)');
ylabel('Voltage (V)');
title(['Clocked Data Triggered at: ' datestr(startTime)])

When the results represent the wanted sine wave they have an offset and seconds after running the script the results change entierly to something wrong. Below I added screenshots of the different results. All the jumpercables are solidly connected on a bread board.

Thank you for any help!

[attila]

Hi @lvogl

The odd captures may look like an internal error, badly phased ADC or DAC data.
Make sure to have new WaveForms version installed.
Check if the problem persists with WaveForms application.