THD of NI PXIe-6368 Analog Output

[SunnySebastian0313]

Hi All,   Here is my question related to NI DAQ 6368 PXIe Card: when I was going through the Specifications sheet of NI 6368 card, THD value is mentioned for Analog input characteristics, But the THD value is not mentioned for Analog Output characteristics, Why is it so? Please help me to find the THD value for AO of NI 6368.  Thank You.

[santo_13]

The THD parameter is valid when you measure/generate sine waves. 

The AO of 6368 cannot generate a clean sinewave on its own due to its sampled nature. The actual signal will be a stepped sine wave (just finer steps), which leads to a higher THD.

You will see the THD specs for only instruments that can generate a clean sinewave such as the DSA range of cards like 4463 

Following is the THD specs for 4463 AO

[SunnySebastian0313]

Hi Santhosh,

Thank you so much for answering my question. Your explanation really helped me understand the topic better.