keita.kawabe@LIGO.ORG - posted 20:31, Thursday 07 March 2019 - last comment - 05:22, Friday 08 March 2019(47379)
DBB powered off (Peter, Keita)
I noticed that DBB interface was on, PeterK and I went to the floor to turn it off.
For locking DBB PMC, it uses a 1MHz oscillator of some sort (probably just a canned crystal). The oscillator is ON all the time even when modulation is disabled as far as it is powered but its frequency is not monitored.
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I think the oscillator is from auris, part number O-1.000000M-AQO 14-50-5.0-A. It's a little difficult to tell from the schematics.