It appears that you are not actually measuring any signal. This could
be because you do not have a signal connected or becuase the
instrument was not configured properly. Try running the Getting
Started Example VI to make sure that the instrument is set up with
appropriate configuration parameter
Thanks for your reply Jason. I tried to use the Output Frequency List
vi to retreive the frequences from the 8510C. I got the "number of
points" shown correctly, but the "current frequency list" show
0.00+0.00i. When I scrolled through the "number of point" the
frequence doesn't change. I wonder
