The N7620B software uses both waveform and sequencer memory to generate patterns. A brief review of how the signals are built will provide an understanding to some of the signal generation limits.
At times, the limits are based on the Arb used, and other times the limits are based on the signal generator used. The following information describes the limits established by the Arb, with regard to the minimum signal period, minimum pulse width and the minimum repetition interval for single and multiple pulses.
In general, each pulse is generated using two waveform segments. One segment contains the pulse on time and the other segment contains the pulse off time. The off time is generated by repeating a small segment with the sequencer to conserve Arb waveform memory.
As the repetition interval becomes shorter and approaches the pulse width, only a single segment is used to define the pulse on time and off time. This will increase the maximum number of unique pulses the Arb can generate in some cases. Also, as the repetition interval continues to shrink, it may be necessary to concatenate multiple pulses into a single segment to meet the Arb minimum segment length.
All of these events are handled automatically by the software and are only described here to help the user understand the signal limits.