Are you using the latest driver? The one I use has a function called
ag33xxx - Waveform Parameters that allows you to individually change
frequency, amplitude, or offset. After setting the amplitude with it,
you can then use the function again in a loop to adjust the frequency
while keeping the amplitude constant. The driver can be downloaded
from NI <A
href="http://zone.ni.com/idnet97.nsf/9b2b33e1993d877786256436006ec498/0027109f3d6e32dd86256d6d0068a5bd?OpenDocument";>here</A>.

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