The use of dspace DS1104 for data acquisition is explained in this blog post. The experiment is to use ADC channel of DS1104 to record the waveform of grid voltage.
In order to record the grid voltage, a step down transformer is used that steps down the 110V/60Hz to 5V/60Hz. The secondary low voltage side of the transformer is connected to the ADC channel 5.
The dSPACE is used widely now a days to validate the theoretical algorithms. The data file is usually in Microsoft access format that can be plotted using MATLAB. The data extraction is particularly helpful in genrating IV and PV curves based on the experimental data.