...
The common 100 nanosecond difference has to do with the some slip between the two DG645 boxes. I'm trying to figure out if the 100 microsecond difference for the cameras.
Locking the laser to RF
The procedure for locking the laser to RF is the same as the sector 10 laser: Enable RF Lock
The photodiode used to get the RF signal from the oscillator is connected to the timing system through a narrow bandpass filter. The photodiode voltage will not show up on the control panel unless the oscillator cavity length is close to correct. When locking, manually adjust the cavity length using the stepper motor to get the frequency within 50Hz, then check that the voltage of the photodiode.