Description of the Generator List Mode is in the CMU200/300 Operating Manual (pages 4.82+ & 6.53+ for programming).
On my CMU200 (V5.21) / K47 (V5.22), the maximum dwell time is only 100ms which is a little short compared to spectrum sweep time, although the manual states 1s !?
It is possible to use multiple identical steps to stay at the same frequency more than 100ms but it not very convenient...
I have tried a little to write a program to set the values over GPIB in the Frequency List table but I have not been able to figure out the exact syntax of the commands "SOURce:RFGenerator:GLIStmode:FREQuency[500] <Frequency [1..500]>" and "SOURce:RFGenerator:GLIStmode:LIST <Start>, <Seq. Length>, <Frequency 1>, <Level 1>, <Frequency 2> … <Level N>" and, so far, none of my trials have been successful.
Does somebody have an example ?
Michel.