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flickering in Analog output signal on NI-6115 w/ LabVIEW 6i at freq. > 100 Hz??!!

I have a NI-6115 DAQ device with LabVIEW 6i and am having difficulty in understanding why my analog output signal is jittery (unstable) when the output waveform (toneburst sinusoid) has a frequency > 100 Hz. I am triggering the generation with a TTL pulse of given pulse width and delay. I have the board updating as fast as it can (4 MS/s), and everything seems to be O.K. until I change the wave frequency above 100 Hz. I will attach my VI so you can check it out. Thanks in advance!

-MDP
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Are you referring to glitches? If yes, then some glitches are normal with DACs as mentioned in the page B-3 of the user manual. Please take a look at Page B-3 of the User manual of 6115. I will also try with your code to see what you are seeing.

Sincerely,
Sastry V
applications Engineer
NI
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