This afternoon Evan and I became suspicous that there is excess sensing noise in the IMC locking loop (alog with details coming in the next few days). After we realized that, I thought it would be a good idea to make some frequency noise measurements using the DBB in 4 configurations:

• FSS unlocked (open FSS screen and request the autolocker to off)
• FSS locked but IMC unlocked (request OFFLINE from IMC_LOCK guardian)
• IMC locked but IFO unlocked (request DOWN from ISC_LOCK)
• full IFO locked (weather permitting)

As Jeff B logged, we can't use the DBB tonight.  I've attached the screenshot of the DBB medm screen right now.  The problem could be the little counter in the operation mode box that (illegibly) says switching to standby mode in 177 minutes.  Every time we hit one of the buttons to request a mode, that counter gets reset to 240 minutes.  I'm not that patient.  I tried caputing 1 minute to that time, but that doesn't work.  Perhaps there is hope that the DBB could possibly be operable if people have the patience to wait four hours between button clicks.  Jeff B will try when the timer goes off to get some of the measurements.

Do any PSL experts have further insights into how to get this working?   

Jeff B is going to leave a print out of the DBB instructions at the operator station.  If any operator is able to make scans, in addition to saving the scans please log the times when you had the DBB PMC locked in different configurations. 

Thanks