HI Jonathan,
Thank you for the quick reply. I checked that the power adapter is supplying 9V. Also I reset the controller board before I run the program but the same issue appears. I switched the USB cable and it doesn't seem to make difference.
One thing I noticed is that when I change the # samples to lower value, for example to 512, the progress window comes up and closes quickly. For the large # samples, if I wait long enough, the pop-up window closes and I have a small gap to properly stop the recording. The problem here is that when I save the data collected, it only saves the last transferred data. If I use 512 for the # samples, the file only contains 512 data samples. I will need to save continuous stream of data using the ADC and the program and the current setting of the program doesn't seem to allow me to do that.
Isaac