What is alternate and chop mode in dual trace oscilloscope?

In a dual-trace oscilloscope, alternate mode allows the instrument to display two separate signals by switching between them for each trigger event, effectively displaying one waveform at a time but at a high speed. Chop mode, on the other hand, rapidly alternates between the two signals within a single sweep, allowing both waveforms to be displayed simultaneously on the screen, giving a more integrated view of their relationship. This mode is useful for comparing signals that have similar frequencies or time bases.