The 2 channels of the Keysight 81150A / 81160A can work as 2 completely
independent instruments that use some shared resources like External-In,
Man key and Clock Reference.
For applications that require some locking of the two channels, the 81150A
/ 81160A provides two means of synchronization.
Frequency Coupling: The frequency of channel 2 is automatically set
to an adjustable ratio of channel 1.
Channel Coupling: The frequency and phase of channel 1 and 2 are
locked. The 81150A / 81160A works as a 2 channel instrument with
only one timing system for both channels.