I re-connected the 3 accelerometers located near the MC1/MC3 chamber. It was a bit tedious to get the cabling sorted - I estimate the cable is ~80m long, and the excess length had to be wound around a spool (see Attachment #1), which wasn't really a 1 person job. It's neat-ish for now, but I'm not entirely satisfied. I think we should get shorter cables (~20m), and also mount the pre-amp/power units in a rack instead of leaving it on the floor. The pre-amp settings are x100 for all three channels. The MC2 channels are powered, but are unconnected to the seismometers - it was too tedious to unroll the other spool yesterday. Apart from this, the cable for the "Z" channel had to be re-seated in the strain relief clamp.
I did not enable any of the CDS filters that convert the raw signal into physical units, so for now, these channels are just recording raw counts.
Update 7pm: the spectra in the current config are here - not sure what to make of the MC2_Z channel appearing to show lower noise?
Update July 13 2020 430pm: This afternoon, I hooked up the MC2 accelerometer channels too...