How can I make difference frequency on NI USB-6259?

[simpson67]

I wanna get difference frequency between 100kHz sine wave and 90kHz sine wave.(=10kHz)

But I encounterred some error masages.. If I can get the difference frequency, I hope to send any analog output.

I will attach my project. plz find the errors if you can..
plz help me TT

[Dennis_Knutson]

Duplicate of http://forums.ni.com/t5/LabVIEW/How-can-I-make-difference-frequency-on-NI-USB-6259/m-p/2606903