Dear researchers and engineers,

I am trying to implement a recommendation from a journal paper, however, I have faced a problem that I could not yet find a solution for it.

To elaborate more, I want to excite an electrical circuit and measure its response. Then I should calculate the DFT of both excitation and response signals. Eventually I should calculate the frequency response function between excitation and response.

The paper says that to prevent the discrepancies caused by DAC which is not an ideal device, it is recommended to do a calibration between the excitation signal generated by software, and the excitation signal that reaches to the circuit. The author says that he has done this calibration for NI USB 6211. To achieve this it is mentioned that”

"Before any measurement and after all the parameters have been defined, the DAC output and the ADC input are internally connected in the DAQ device, and the excitation signal is sampled and stored once to replace the excitation signal generated by the software."

My problem is that I don't know how to implement the idea that I put in the quotation.

My daq device is NI USB X 6356.

I would be thankful if you help me with this problem?

Thank you,