I am trying to use a PCI 6259 board to generate a periodic analog waveform based on an external clock of which the frequency is ~15 MHz. The external clock is from a CCD camera. I set the external clock rate to 15 MHz in the front panel. When I run my program, the 'actual sample clock rate' indicates 0 Hz and the error message comes out; frequency => sampling rate/2. Then the next message is that the maximum clock frequency is 10 MHz. I attached the diagram I wrote. I think the error occured in the basic function generator.vi. If you know how to solve this problem, please let me know. Thanks. | 
