Hi,
I hve to generate high frequency sinusoid (90-100 kHz). I have a NI USB-6259(BNC) board. When I try to generate a sinusoid with frequency of 100 kHz, since the maximum sampling frequency is about 1.25 MHz, I have only 12 points per period. Thus the resolution of the output signal is very low and the sinusoid, seen with an oscilloscope, is evidently quantized. But if I generate the same signal with a program realized in Visual Basic and using a board with a lower maximum sample frequency, the signal seen on the oscilloscope is very smoother.
I tried the Labview software I made with this second board, in order to check if it was a board problem, but the signal was still bad.
The code I used for the software in labview is a mere copy of the code present in the DAQ assistant express VI. Unfortunately I do not hve the Visual basic program source code, so I can't say how it works.
Now, my question is: There's a way to generate smooth signal at high frequency even with a small amount of point per period?