The sweep generator stops at 1/2 the end frequency. For example, if I set the start at 20 and end at 20000 it sweeps to 10000 and begins again at 20. If I set the end at 50000 it only sweeps between 20 and 25000. If I turn off Sweep and set the frequency to any value it generates the correct signal. Why is this happening? I have power cycled everything and checked the DAC and ADC settings.