Reports until 14:33, Monday 16 November 2015
H1 SEI
hugh.radkins@LIGO.ORG - posted 14:33, Monday 16 November 2015 (23440)
Rotated STS2-A (HAM2) results--Bad Y channel

I rotated the HAM2 STS2 to see if elevated power in the Y channel was from tilting or a bad channel.  The first attachment shows the 5 site SEI STS2s when the wind was fairly quiet.  The top row of panels is from 19 October before the HAM2 STS2 rotation; the bottom row is from 12 Nov after the sensor was rotated.  The HAM2 Y channel still shows elevated signal even though it is now rotated to align with the X axis.  So this isn't related to orientation wrt SW facing wall.  Additionally, these are quiet wind times (<10mph) so hard to explain this away with wind tilt noise.

The second attachment is similarly arranged with the same 19 October panels in the top row but now the lower panels are from 13 November when the wind was really honking (20 to 60mph.)  Notice that all the X & Y signals are much larger at lower frequencies (<~0.3hz,) except the HAM2 Y channel which in the lower panels is actually pointing in X.  This channel has a larger magnitude until you get to about 10mHZ but it does not respond anywhere near to amount that the other sensors do.  This indicates to me that the HAM2 Y channel is definitely not healthy.

Images attached to this report