Hugh R., Marc P.
Today we worked on the STS-2 Seismometer in the vault. Hugh looked at the seismometer to make sure that it was unlocked and connected correctly. We disconnected the green field box and returned to the LVEA to test it with the working seismometer near HAM2. The field box tested good and was returned and reconnected to the system at the vault. Hugh was concerned that we were using two cables out of the field box and asked if we could check where the other cable was going. We followed the 2nd cable back to the electronics fridge where we discovered that the end of that cable was corroded and possibly shorted internally. We disconnected the bad cable, and made sure that the other cable had good power and signal before closing everything up.
Hugh will attach the results on this ALOG.
Attached are comparison spectra between the Vault STS2 and the SEI ITMY STS2 sensor in the LVEA used for SEI Sensor Correction.
Also see on the image are the calibrations applied to the vault signals. The gain on the SEI signals are 6.4e-14; the vault signals have a factor of 10 applied somewhere...
Anyway, the signals compare pretty well.
In the vault, the seismometer looked pretty well level and the lock/unlock mechanism seemed to engage and disengage. The mass centering was pretty good with all <2V and maybe just one that was still above 1V. It appears that the cable supplying the power was shorting out the host box. It seemed the mass centering attempts did nothing while that cable was connected. When the STS host box was cabled in the typical way for our field deployments, all worked fine.
Robert of course needs to sign off but this plot should give him relief.